CN113009673B

CN113009673B - Image pickup lens

Info

Publication number: CN113009673B
Application number: CN202110269828.7A
Authority: CN
Inventors: 侯璟; 张晓彬; 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: 2021-03-12
Filing date: 2021-03-12
Publication date: 2023-09-26
Anticipated expiration: 2041-03-12
Also published as: CN113009673A

Abstract

The invention provides an imaging lens. The imaging lens sequentially comprises from an object side of the imaging lens to an image side of the imaging lens along the optical axis direction of the imaging lens: a first lens having positive optical power; a second lens; a third lens; a fourth lens having negative optical power; a fifth lens; a sixth lens having negative optical power; the F number Fno of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 1.6.ltoreq.FNo.ltoreq.2.1; the effective focal length f of the imaging lens, the air interval T34 on the optical axis of the third lens and the fourth lens, and the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: 4.5.ltoreq.f/(T34+T45) <6.5. The invention solves the problem that the camera in the prior art can not simultaneously meet the characteristics of a long-focus lens and a large aperture.

Description

Image pickup lens

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an imaging lens.

Background

In recent years, the market demand of smart phones increases year by year, and a single mobile phone usually carries 2-8 cameras, so that the productivity and quality of the cameras become important concerns of mobile phone manufacturers and consumers. Meanwhile, photographic lenses with different functions such as large aperture, ultra wide angle, ultra-thin, small head, long focus, optical anti-shake and the like are developed in the market, so that the choices of people are greatly enriched. The tele lens can realize local close-up of a person at a distance in actual shooting, so that the tele lens is favored by more and more consumers and mobile phone manufacturers. However, the existing camera cannot meet the characteristics of a long-focus lens and a large aperture at the same time.

That is, the camera in the prior art has a problem that the characteristics of the tele lens and the large aperture cannot be simultaneously satisfied.

Disclosure of Invention

The invention mainly aims to provide an imaging lens, which solves the problem that a camera in the prior art cannot simultaneously meet the characteristics of a long-focus lens and a large aperture.

In order to achieve the above object, according to one aspect of the present invention, there is provided an image pickup lens including, in order from an object side of the image pickup lens to an image side of the image pickup lens along an optical axis direction of the image pickup lens: a first lens having positive optical power; a second lens; a third lens; a fourth lens having negative optical power; a fifth lens; a sixth lens having negative optical power; the F number Fno of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 1.6.ltoreq.FNo.ltoreq.2.1; the effective focal length f of the imaging lens, the air interval T34 on the optical axis of the third lens and the fourth lens, and the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: 4.5.ltoreq.f/(T34+T45) <6.5.

Further, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 5.5mm < TTL/TAN (FOV) is less than or equal to 7.0mm.

Further, the entrance pupil diameter EPD of the imaging lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy: 4.ltoreq.EPD/(CT3+CT4) <6.0.

Further, the effective focal length f of the imaging lens, the center thickness CT5 of the fifth lens, and the air interval T56 on the optical axis between the fifth lens and the sixth lens satisfy: 3<f/(CT5+T56) <6.5.

Further, the effective focal length f of the imaging lens, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy 3.0< f/(CT1+CT2+CT3) <4.0.

Further, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy: the ratio of (CT2+CT4)/CT 3 is less than or equal to 0.7 and less than 1.1.

Further, the effective focal length f1 of the first lens and the center thickness CT1 of the first lens satisfy: 3.5< f1/CT1 is less than or equal to 6.0.

Further, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT32 of the image side surface of the third lens satisfy: 1.2< DT11/DT32<1.5.

Further, the maximum effective radius DT41 of the object side surface of the fourth lens element and the maximum effective radius DT62 of the image side surface of the sixth lens element satisfy the following conditions: 1.5< DT62/DT41<2.2.

Further, 1.3+.epd/(dt32+dt41) <1.5 is satisfied among the entrance pupil diameter EPD of the imaging lens, the maximum effective radius DT32 of the image side surface of the third lens, and the maximum effective radius DT41 of the object side surface of the fourth lens.

Further, the effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens satisfy: -0.6.ltoreq.f/f 4<0.

Further, the effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens satisfy: f/|f5| <0.5.

Further, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f6 of the sixth lens satisfy: and (f 3-f 6)/f 1 is less than or equal to 2.5 and less than 8.0.

Further, the effective focal length f of the imaging lens, the radius of curvature R4 of the image side surface of the second lens, and the radius of curvature R5 of the object side surface of the third lens satisfy: 0.5< f/R4-f/R5<2.0.

Further, the effective focal length f of the imaging lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.5< f/(R3+R4) <1.5.

Further, the effective focal length f of the imaging lens, the radius of curvature R7 of the object side surface of the fourth lens, and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.5< f/R7+fR8 <3.5.

According to another aspect of the present invention, there is provided an image pickup lens including, in order from an object side of the image pickup lens to an image side of the image pickup lens along an optical axis direction of the image pickup lens: a first lens having positive optical power; a second lens; a third lens; a fourth lens having negative optical power; a fifth lens; a sixth lens having negative optical power; the F number Fno of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 1.6.ltoreq.FNo.ltoreq.2.1; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 5.5mm < TTL/TAN (FOV) is less than or equal to 7.0mm.

Further, the effective focal length f of the imaging lens, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy: 3.0< f/(CT1+CT2+CT3) <4.0.

By applying the technical scheme of the invention, the image pickup lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side of the image pickup lens to the image side of the image pickup lens along the optical axis direction of the image pickup lens, wherein the first lens has positive focal power; the fourth lens has negative focal power; the sixth lens has negative focal power; the F number Fno of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 1.6.ltoreq.FNo.ltoreq.2.1; the effective focal length f of the imaging lens, the air interval T34 on the optical axis of the third lens and the fourth lens, and the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: 4.5.ltoreq.f/(T34+T45) <6.5.

By multiplying the F number of the imaging lens by the tangent value of the maximum field angle, the characteristic of a large aperture of the imaging lens can be ensured to be maintained within a smaller range, and the long-focus characteristic of the imaging lens can be ensured to be maintained within a smaller range. The ratio of the effective focal length f of the imaging lens to the sum of the air interval T34 of the third lens and the fourth lens on the optical axis and the air interval T45 of the fourth lens and the fifth lens on the optical axis is controlled to be in a reasonable range, and the axial distance between the third lens and the fourth lens and between the fourth lens and the fifth lens can be ensured not to be too small while the long focal length performance is met. The lens is beneficial to an assembly process, light interference caused by too close of two lenses is avoided, field curvature and astigmatism of the camera lens can be adjusted, sensitivity of the lenses is reduced, ghost image energy among the third lens, the fourth lens and the fifth lens is weakened, and imaging quality of the camera lens is improved.

Drawings

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

Fig. 1 is a schematic diagram showing the structure of an imaging lens according to an example one of the present invention;

fig. 2 to 5 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 1, respectively;

fig. 6 is a schematic diagram showing the structure of an imaging lens according to example two of the present invention;

fig. 7 to 10 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 6, respectively;

fig. 11 is a schematic diagram showing the structure of an imaging lens 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 of the imaging lens in fig. 11, respectively;

fig. 16 is a schematic diagram showing the structure of an imaging lens of 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 of the imaging lens in fig. 16, respectively;

fig. 21 is a schematic diagram showing the configuration of an imaging lens of 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 of the imaging lens in fig. 21, respectively;

fig. 26 is a schematic diagram showing the structure of an imaging lens of 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 of the imaging lens in fig. 26, respectively;

fig. 31 is a schematic diagram showing the configuration of an imaging lens 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 magnification chromatic aberration curve of the imaging lens in fig. 31, respectively;

fig. 36 is a schematic view showing the structure of an imaging lens of example eight of the present invention;

fig. 37 to 40 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 36, respectively.

Fig. 41 is a schematic diagram showing the structure of an imaging lens of example nine of the present invention;

fig. 42 to 45 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens in fig. 41, respectively;

wherein the above figures include the following reference numerals:

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

Detailed Description

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

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.

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

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

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

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

The invention provides an imaging lens, which aims to solve the problem that a camera in the prior art cannot simultaneously meet the characteristics of a long-focus lens and a large aperture.

Example 1

As shown in fig. 1 to 45, the image pickup apparatus includes, in order from an object side of an image pickup lens to an image side of the image pickup lens along an optical axis direction of the image pickup lens, a first lens having positive optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the fourth lens has negative focal power; the sixth lens has negative focal power; the F number Fno of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 1.6.ltoreq.FNo.ltoreq.2.1; the effective focal length f of the imaging lens, the air interval T34 on the optical axis of the third lens and the fourth lens, and the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: 4.5.ltoreq.f/(T34+T45) <6.5.

Preferably, the F-number Fno of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 1.83 < FNo > TAN (FOV) < 2.05; the effective focal length f of the imaging lens, the air interval T34 on the optical axis of the third lens and the fourth lens, and the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: f/(T34+T45) of 4.52.ltoreq.f <6.11.

In this embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 5.5mm < TTL/TAN (FOV) is less than or equal to 7.0mm. By controlling the ratio range of TTL/TAN (FOV), the on-axis distance from the object side surface to the imaging surface of the first lens is ensured to be short under the condition of maintaining a small field angle of the imaging lens, so that the miniaturization and portability of the imaging lens are ensured. Meanwhile, the compact structure is also beneficial to torsion resistance, high-altitude drop and roller test so as to realize wider application. Preferably, an on-axis distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens and a maximum field angle FOV of the imaging lens satisfy: TTL/TAN (FOV) of 5.94mm is less than or equal to 6.35mm.

In the present embodiment, the entrance pupil diameter EPD of the imaging lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy: 4.ltoreq.EPD/(CT3+CT4) <6.0. The arrangement can ensure that the center thicknesses of the third lens and the fourth lens are not too thin on the premise of meeting the miniaturization of the total length of the imaging lens, is favorable for processing and assembling processes of the imaging lens, and avoids the problems of difficult debugging, lens deformation and the like caused by the excessive thinness of the lenses, thereby influencing the imaging quality of the imaging lens. The distortion and the field curvature of the whole optical system can be balanced better, the appearance influence of the thickness of the third lens and the fourth lens is reduced, and the risks of ghost images and parasitic light caused by appearance problems of the third lens and the fourth lens are avoided. Preferably, the entrance pupil diameter EPD of the imaging lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy: 4.04.ltoreq.EPD/(CT3+CT4) <5.48.

In the present embodiment, the effective focal length f of the imaging lens, the center thickness CT5 of the fifth lens, and the air interval T56 on the optical axis between the fifth lens and the sixth lens satisfy: 3<f/(CT5+T56) <6.5. The setting can control the effective focal length of the camera lens in a reasonable range, ensure the range of the maximum half field angle and avoid steep light deflection caused by over-concentrated focal power. The thickness of the fifth lens is reasonably distributed, processing and assembly of the lenses are facilitated, ghost image risks and sensitivity of the lenses can be effectively reduced, light deflection and energy distribution between the two lenses can be weakened by balancing an air gap between the fifth lens and the sixth lens, and coma aberration and astigmatism of a system can be effectively reduced by matching the fifth lens and the sixth lens, so that stability of field curvature and MTF peak value are greatly facilitated. Preferably, the effective focal length f of the imaging lens, the center thickness CT5 of the fifth lens, and the air interval T56 on the optical axis of the fifth lens and the sixth lens satisfy: 3.77< f/(CT5+T56) <6.17.

In the present embodiment, the effective focal length f of the imaging lens, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy 3.0< f/(CT 1+ct2+ct 3) <4.0. The arrangement enables the camera lens to have larger effective focal length and smaller field angle, can better converge external light at a distance, obtains larger aperture and illuminance, and enables the camera lens CRA to be better matched with the CCD chip. The central thickness of the first three lenses is controlled, so that the respective thicknesses meet the minimum thickness required by the assembly stability, the assembly deformation and ghost image reflection energy of the lenses can be reduced, the distortion and dispersion of the system can be balanced better, and the miniaturization of the system is facilitated. Preferably, the effective focal length f of the imaging lens, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy 3.16< f/(CT1+CT2+CT3) <3.72.

In the present embodiment, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy: the ratio of (CT2+CT4)/CT 3 is less than or equal to 0.7 and less than 1.1. The range of the ratio of the sum of the center thicknesses of the second lens and the fourth lens to the center thickness of the third lens is reasonably distributed, the thickness complementation of the three lenses can be realized, a thin-thick-thin configuration is basically formed, the positive spherical aberration, the positive and negative astigmatism, the positive and negative distortion, the chromatic aberration and the like are well counteracted, and the lens has good complementation buffering effect on extreme environments such as high temperature, low temperature and the like and shows good temperature drift performance. Preferably, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy: the ratio of (CT2+CT4)/CT 3 is less than or equal to 0.74 and less than 1.01.

In the present embodiment, the effective focal length f1 of the first lens and the center thickness CT1 of the first lens satisfy: 3.5< f1/CT1 is less than or equal to 6.0. The focal power of the first lens is reasonably distributed, so that the light trend can be controlled, the light receiving capacity of the whole optical system can be effectively improved, and meanwhile, the problem that the sensitivity of the first lens is high due to the fact that light is too steep is avoided; the thickness of the first lens is reasonably distributed, so that processing difficulty caused by excessive thinning of the lens can be avoided, coma aberration of a system can be effectively reduced by matching with the second lens, and meanwhile, ghost images and MTF design values are well improved. Preferably, the effective focal length f1 of the first lens and the center thickness CT1 of the first lens satisfy: 3.72< f1/CT1 is less than or equal to 5.99.

In the present embodiment, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT32 of the image side surface of the third lens satisfy the following conditions: 1.2< DT11/DT32<1.5. The ratio of the radius of the first lens to the radius of the third lens are reasonably controlled, so that on one hand, the vignetting value of the system can be effectively controlled, and part of light rays with poor imaging quality can be intercepted, so that the resolution and the relative illuminance of the whole optical system can be improved; on the other hand, the problem of large step difference caused by overlarge radius difference between the first lens and the third lens can be avoided, and the stability of assembly is ensured. The larger radius of the first lens can ensure that the system can absorb enough luminous flux and maintain the large aperture characteristic of the system. Preferably, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT32 of the image side surface of the third lens satisfy: 1.27< DT11/DT32<1.4.

In the present embodiment, the maximum effective radius DT41 of the object side surface of the fourth lens element and the maximum effective radius DT62 of the image side surface of the sixth lens element satisfy the following conditions: 1.5< DT62/DT41<2.2. The ratio of the maximum effective radius of the sixth lens to the maximum effective radius of the fourth lens can be reasonably controlled, miniaturization of the lens radius can be guaranteed, the radius difference between the sixth lens and the fourth lens is prevented from being too large, and uniformity of the system size is guaranteed. By limiting the radius ratio, stray light can be effectively filtered, and the stray light performance of the optical system is improved. Preferably, the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius DT62 of the image side surface of the sixth lens satisfy: 1.58< DT62/DT41<2.14.

In the present embodiment, 1.3+.epd/(dt32+dt41) <1.5 is satisfied among the entrance pupil diameter EPD of the imaging lens, the maximum effective radius DT32 of the image side surface of the third lens, and the maximum effective radius DT41 of the object side surface of the fourth lens. The system has enough luminous flux to ensure the illumination of an imaging surface while ensuring the miniaturization of the optical system, and excellent imaging quality is maintained in an environment where night shooting or light energy is weak. The radial dimension can be limited to limit the sagittal height range of the surface, which is beneficial to practical processing assembly, weakening of total reflection and improvement of performance. Preferably, 1.33+.epd/(dt32+dt41) <1.45 is satisfied between the entrance pupil diameter EPD of the imaging lens, the maximum effective radius DT32 of the image side surface of the third lens, and the maximum effective radius DT41 of the object side surface of the fourth lens.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens satisfy: -0.6.ltoreq.f/f 4<0. The ratio of the effective focal length of the imaging lens to the effective focal length of the fourth lens is reasonably controlled, so that the deflection of light rays in the fourth lens can be slowed down, the sensitivity of the fourth lens is reduced, the requirement of too tight tolerance is avoided, and the spherical aberration, astigmatism and the like generated by the first lens can be reduced. Preferably, the effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens satisfy: -0.58.ltoreq.f4 < -0.22.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens satisfy: f/|f5| <0.5. The arrangement can ensure that the absolute value of the focal length of the fifth lens is at least 2 times of the effective focal length of the system under the premise of ensuring the long focal length of the system, reduces the refraction degree of the fifth lens, ensures that the deflection of the light rays of each field of view on the surface of the lens is more gentle, can effectively reduce the total reflection of the light rays and the ghost image risk of the surface, and also ensures that the focal power of the sixth lens has a larger selection range. Preferably, the effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens satisfy: 0.02< f/|f5| <0.42.

In the present embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f6 of the sixth lens satisfy: and (f 3-f 6)/f 1 is less than or equal to 2.5 and less than 8.0. The sensitivity of the three lenses can be reduced, the requirement of too tight tolerance is avoided, the lens can be matched with the whole system through cross distribution, positive and negative spherical aberration, chromatic aberration of magnification and the like under different observation can be better complemented, and therefore the resolution level of the whole system is improved. Preferably, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f6 of the sixth lens satisfy: and (f 3-f 6)/f 1 is less than or equal to 2.53 and less than 7.44.

In the present embodiment, the effective focal length f of the imaging lens, the radius of curvature R4 of the image side surface of the second lens, and the radius of curvature R5 of the object side surface of the third lens satisfy: 0.5< f/R4-f/R5<2.0. The curvature radiuses of the image side surface of the second lens and the object side surface of the third lens are reasonably distributed, so that the curvatures of the surfaces of the second lens and the third lens are not too large, the processing difficulty caused by too large opening angle is avoided, the sensitivity of the second lens and the third lens can be obviously reduced, strict tolerance requirements and process level are avoided, and the coma aberration, the field curvature and the like of the camera lens are effectively slowed down. Preferably, the effective focal length f of the imaging lens, the radius of curvature R4 of the image side surface of the second lens, and the radius of curvature R5 of the object side surface of the third lens satisfy: 0.56< f/R4-f/R5<1.71.

In the present embodiment, the effective focal length f of the imaging lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.5< f/(R3+R4) <1.5. The curvature radiuses of the object side surface of the second lens and the image side surface of the second lens are reasonably distributed, so that the curvature radiuses of the two optical surfaces of the second lens are not too small, the sagittal height of the lens is controlled within a reasonable range, deflection of light rays in the second lens can be slowed down, sensitivity of the lens is effectively reduced, meanwhile, convergence of the light rays is facilitated, and surface total reflection and ghost images are avoided. Preferably, the effective focal length f of the imaging lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.73< f/(R3+R4) <1.41.

In the present embodiment, the effective focal length f of the imaging lens, the radius of curvature R7 of the object side surface of the fourth lens, and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.5< f/R7+fR8 <3.5. The curvature radius of the object side surface of the fourth lens and the curvature radius of the image side surface of the fourth lens are reasonably distributed, so that the appearance of the fourth lens is more beneficial to injection molding and assembly processes, the plane sensitivity of the fourth lens is reduced, and the field curvature, coma and distortion of the system are effectively balanced on the existing process capability. Preferably, the effective focal length f of the imaging lens, the radius of curvature R7 of the object side surface of the fourth lens, and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.63< f/R7+fR8 <3.08.

Example two

As shown in fig. 1 to 45, the imaging lens includes, in order from an object side of the imaging lens to an image side of the imaging lens, in an optical axis direction of the imaging lens: a first lens having positive optical power; a second lens; a third lens; a fourth lens having negative optical power; a fifth lens; a sixth lens having negative optical power; the F number Fno of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 1.6.ltoreq.FNo.ltoreq.2.1; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 5.5mm < TTL/TAN (FOV) is less than or equal to 7.0mm.

By multiplying the F number of the imaging lens by the tangent value of the maximum field angle, the characteristic of a large aperture of the imaging lens can be ensured to be maintained within a smaller range, and the long-focus characteristic of the imaging lens can be ensured to be maintained within a smaller range. By controlling the ratio range of TTL/TAN (FOV), the on-axis distance from the object side surface to the imaging surface of the first lens is ensured to be short under the condition of maintaining a small field angle of the imaging lens, so that the miniaturization and portability of the imaging lens are ensured. Meanwhile, the compact structure is also beneficial to torsion resistance, high-altitude drop and roller test so as to realize wider application.

Preferably, the F-number Fno of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 1.83 < FNo > TAN (FOV) < 2.05; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: TTL/TAN (FOV) of 5.94mm is less than or equal to 6.35mm.

In the present embodiment, the entrance pupil diameter EPD of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 3.4.ltoreq.EPD/TAN (FOV) <4.5. The size of the entrance pupil diameter of the system can be ensured by controlling the ratio of the entrance pupil diameter to the tangent value of the maximum field angle, so that the system can ensure that the image surface has higher illumination through enough luminous flux, excellent imaging quality can be maintained in dark environment, and the long-focus characteristic of the system can be ensured by limiting the field angle. Preferably, the entrance pupil diameter EPD of the imaging lens and the maximum field angle FOV of the imaging lens satisfy: 3.42 mm.ltoreq.EPD/TAN (FOV) <3.76mm.

In the present embodiment, the effective focal length f of the imaging lens, the air interval T34 on the optical axis of the third lens and the fourth lens, and the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: 4.5.ltoreq.f/(T34+T45) <6.5. The ratio of the effective focal length f of the imaging lens to the sum of the air interval T34 of the third lens and the fourth lens on the optical axis and the air interval T45 of the fourth lens and the fifth lens on the optical axis is controlled to be in a reasonable range, and the axial distance between the third lens and the fourth lens and between the fourth lens and the fifth lens can be ensured not to be too small while the long focal length performance is met. The lens is beneficial to an assembly process, light interference caused by too close of two lenses is avoided, field curvature and astigmatism of the camera lens can be adjusted, sensitivity of the lenses is reduced, ghost image energy among the third lens, the fourth lens and the fifth lens is weakened, and imaging quality of the camera lens is improved. Preferably, the effective focal length f of the imaging lens, the air interval T34 on the optical axis of the third lens and the fourth lens, and the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: f/(T34+T45) of 4.52.ltoreq.f <6.11.

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

The imaging lens in the present application may employ a plurality of lenses, for example, the six lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens, the aperture of the imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the imaging lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones and the like. The camera lens has the advantages of large aperture, small depth of field, ultra-thin and good imaging quality, and can meet the miniaturization requirement of intelligent electronic products.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in the specification without departing from the technical solution claimed in the present application. For example, although six lenses are described as an example in the embodiment, the imaging lens is not limited to include six lenses. The imaging lens may also include other numbers of lenses, if desired.

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

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

Example one

As shown in fig. 1 to 5, an imaging lens according to an example one of the present application is described, and fig. 1 is a schematic diagram showing the configuration of the imaging lens according to the example one.

As shown in fig. 1, the image capturing lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 7.01mm, and the maximum field angle FOV of the imaging lens is 49.7 °.

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

TABLE 1

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

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 that can be used for each of the aspherical mirrors S1-S12 in example one.

Face number

A4

A6

A8

A10

A12

A14

S1

-7.0377E-02

-2.8266E-02

-8.3107E-03

-2.7807E-03

-8.8680E-04

-2.9384E-04

S2

5.9946E-02

-3.2982E-03

-1.7258E-03

-2.3731E-03

1.2366E-04

-3.0741E-05

S3

-2.1326E-01

4.7800E-02

-8.3569E-03

-6.5227E-04

2.5780E-04

1.8729E-04

S4

-2.8133E-01

3.6086E-02

-1.1077E-02

-2.1206E-03

-5.0120E-04

1.3617E-04

S5

4.8360E-02

3.6731E-02

2.2745E-05

-1.6817E-03

-8.5396E-04

-4.0817E-04

S6

-2.4933E-02

7.4474E-03

-1.9445E-03

-1.3520E-03

-6.3671E-04

-2.1690E-04

S7

-2.7808E-01

9.8736E-03

-8.4730E-03

-1.9132E-03

-5.6783E-04

-1.1065E-04

S8

-2.4266E-01

4.5050E-02

-5.3854E-03

-5.8818E-04

-2.1116E-04

3.9743E-05

S9

-3.2381E-01

-2.0221E-02

2.7644E-04

7.0708E-04

3.3935E-04

2.5822E-04

S10

-3.8476E-01

-1.8747E-02

3.1217E-03

3.3850E-03

1.4885E-03

9.2356E-04

S11

-1.4298E+00

3.1369E-01

-4.1093E-02

2.2093E-02

-6.5482E-03

1.1693E-03

S12

-2.6629E+00

2.1505E-01

-1.2668E-01

1.8073E-02

-1.5891E-02

1.2105E-03

Face number

A16

A18

A20

A22

A24

A26

S1

-7.1231E-05

1.8201E-06

1.0336E-05

6.3578E-06

0.0000E+00

S2

1.3534E-04

8.3025E-06

-4.6061E-06

2.3873E-06

0.0000E+00

S3

1.3003E-04

2.0045E-05

-1.7733E-05

7.0204E-07

0.0000E+00

S4

8.4930E-05

2.6839E-05

-1.5858E-05

-8.1334E-06

0.0000E+00

S5

-2.0501E-04

-9.7477E-05

-4.8836E-05

-1.7710E-05

-1.0565E-06

0.0000E+00

S6

-5.5917E-05

8.2542E-07

6.5008E-06

8.0093E-06

0.0000E+00

S7

-4.8543E-05

-4.9860E-06

-3.7894E-06

1.3788E-06

0.0000E+00

S8

-3.4982E-05

6.9656E-06

-1.4122E-06

3.9117E-06

0.0000E+00

S9

2.0019E-05

-1.4037E-05

-1.5946E-05

-5.1020E-06

0.0000E+00

S10

2.2577E-04

8.3762E-05

1.3589E-05

2.6311E-06

0.0000E+00

S11

-8.1174E-04

1.9090E-04

8.7847E-05

-3.9273E-05

-2.0629E-06

-1.5714E-07

S12

-3.1774E-03

-3.6648E-04

-6.0994E-04

-1.5465E-04

0.0000E+00

TABLE 2

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

As can be seen from fig. 2 to 5, the imaging lens provided in example one can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an imaging lens according to a second example of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 6 shows a schematic view of an imaging lens configuration of example two.

As shown in fig. 6, the image capturing lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 7.16mm, and the maximum field angle FOV of the imaging lens is 48.8 °.

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

TABLE 3 Table 3

The higher order coefficients 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-S12 in example two are given in Table 4.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-8.8067E-02

-2.8224E-02

-9.0003E-03

-2.5530E-03

-6.9349E-04

-1.9754E-04

-8.4125E-05

S2

3.4461E-02

9.4942E-03

-3.8084E-03

-2.0846E-03

2.9258E-04

-4.7178E-04

4.9014E-05

S3

-4.9730E-02

4.4346E-02

-6.2287E-03

-2.2958E-03

3.3348E-04

-4.8452E-04

-6.5048E-05

S4

-5.4899E-02

4.4216E-02

-5.4879E-03

-4.7353E-03

-1.0466E-03

-2.5358E-04

-1.6400E-04

S5

5.6057E-02

4.0377E-02

-1.4136E-03

-3.9591E-03

-1.6301E-03

-6.6227E-04

-4.3394E-04

S6

-2.1907E-02

6.1115E-03

-3.6116E-03

-1.7154E-03

-6.7731E-04

-1.8427E-04

-5.2022E-05

S7

-2.6702E-01

5.3170E-03

-6.3018E-03

-1.2414E-03

-1.4114E-04

1.1039E-06

2.7062E-05

S8

-1.9155E-01

3.5225E-02

-1.8929E-03

9.0187E-04

5.7125E-04

2.0509E-04

7.4217E-05

S9

-4.0088E-01

-1.9456E-02

1.1742E-02

5.1248E-03

2.4158E-03

1.2010E-03

3.1380E-04

S10

-4.3925E-01

-7.6254E-03

2.3394E-02

5.5274E-03

1.8598E-03

1.1048E-03

3.1023E-04

S11

-6.1567E-01

2.8102E-01

-7.1205E-03

-1.2556E-02

-6.4792E-03

8.3527E-03

-3.4327E-03

S12

-1.4970E+00

2.2453E-01

-1.2298E-02

1.8162E-02

-1.0928E-02

6.5534E-03

-2.4137E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-3.0704E-05

-1.8381E-05

-2.1445E-06

2.2055E-06

3.1051E-06

0.0000E+00

S2

-7.3776E-05

1.7039E-05

2.9593E-05

-2.7445E-05

8.1918E-06

4.8166E-06

1.7533E-06

S3

-1.0211E-04

-3.2426E-05

2.3368E-05

-3.5570E-05

0.0000E+00

S4

-1.1281E-04

-7.1536E-05

-1.0193E-05

-1.2096E-05

-5.8786E-06

1.3034E-06

0.0000E+00

S5

-2.2726E-04

-1.2594E-04

-5.4560E-05

-3.3558E-05

-1.8657E-05

-9.1837E-06

0.0000E+00

S6

-5.3441E-06

6.7355E-06

5.6700E-06

4.2887E-06

0.0000E+00

S7

1.5819E-05

1.6057E-05

1.0249E-05

6.8894E-06

4.8021E-06

3.9172E-06

2.1946E-06

S8

2.7420E-05

1.9726E-05

9.8560E-06

5.6288E-06

-1.2926E-06

-7.4054E-07

0.0000E+00

S9

-2.8622E-05

-1.3992E-04

-1.0646E-04

-5.6927E-05

-1.5927E-05

-3.3917E-06

3.5538E-06

S10

3.6248E-05

-1.0855E-04

-1.1860E-04

-8.0677E-05

-4.6558E-05

-2.3284E-05

-7.1597E-06

S11

-5.6720E-04

1.9512E-04

1.2362E-04

-1.9902E-04

3.6854E-05

1.5172E-05

-4.8589E-05

S12

-1.8068E-04

-7.4930E-04

-1.7027E-04

-3.3689E-04

-1.2003E-04

4.0141E-05

3.9513E-05

TABLE 4 Table 4

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

As can be seen from fig. 7 to 10, the imaging lens provided in example two can achieve good imaging quality.

Example three

As shown in fig. 11 to 15, an imaging lens of example three of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 11 shows a schematic view of an imaging lens configuration of example three.

As shown in fig. 11, the image capturing lens includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 7.03mm, and the maximum field angle FOV of the imaging lens is 47.1 °.

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

TABLE 5

The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 that can be used for each of the aspherical mirrors S1-S12 in example three are given in Table 6.

TABLE 6

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

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

Example four

As shown in fig. 16 to 20, an imaging lens of example four of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 16 shows a schematic view of an imaging lens configuration of example four.

As shown in fig. 16, the image capturing lens includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 7.02mm, and the maximum field angle FOV of the imaging lens is 47.8 °.

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

TABLE 7

Table 8 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 that can be used for each of the aspherical mirrors S1-S12 in example four.

TABLE 8

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

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

Example five

As shown in fig. 21 to 25, an imaging lens of example five of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 21 shows a schematic view of an imaging lens configuration of example five.

As shown in fig. 21, the image capturing lens includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 6.9mm, and the maximum field angle FOV of the imaging lens is 48.5 °.

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

TABLE 9

Table 10 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 that can be used for each of the aspherical mirrors S1-S12 in example five.

Table 10

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

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

Example six

As shown in fig. 26 to 30, an imaging lens of example six of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 26 shows a schematic view of an imaging lens configuration of example six.

As shown in fig. 26, the image capturing lens includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 6.62mm, and the maximum field angle FOV of the imaging lens is 47.8 °.

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

TABLE 11

Table 12 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 that can be used for each of the aspherical mirrors S1-S12 in example six.

Face number

A4

A6

A8

A10

A12

A14

S1

-1.3513E-02

5.0321E-02

-9.9732E-02

1.1448E-01

-8.2321E-02

3.8114E-02

S2

2.7650E-02

-6.1007E-02

9.0530E-02

-8.9173E-02

5.9851E-02

-2.7379E-02

S3

-4.2495E-02

3.6137E-05

1.0042E-02

3.0542E-03

-1.1038E-02

8.5622E-03

S4

-7.4948E-02

3.1064E-02

-2.4504E-02

3.7726E-02

-3.9755E-02

2.7103E-02

S5

-1.4726E-02

2.4698E-02

-6.1250E-02

1.2471E-01

-1.7592E-01

1.7688E-01

S6

-1.0059E-02

-2.4513E-03

6.2467E-03

-1.1275E-02

1.6838E-02

-1.3963E-02

S7

-1.0132E-01

6.4596E-02

-1.6344E-01

3.2778E-01

-4.4343E-01

4.2267E-01

S8

-2.5539E-02

-3.5870E-01

1.2349E+00

-2.5172E+00

3.3151E+00

-2.8641E+00

S9

-7.2857E-02

1.3516E-01

-5.5061E-01

1.1525E+00

-1.5341E+00

1.3298E+00

S10

-4.9756E-02

3.6992E-02

-6.1085E-02

5.7521E-02

-3.9396E-02

1.9767E-02

S11

-1.6315E-01

9.5644E-02

-4.7348E-03

-4.4928E-02

4.7506E-02

-3.0191E-02

S12

-2.2597E-01

1.4776E-01

-8.0250E-02

3.5298E-02

-1.1786E-02

2.8185E-03

Face number

A16

A18

A20

A22

A24

A26

S1

-1.1357E-02

2.1046E-03

-2.2099E-04

1.0081E-05

0.0000E+00

S2

8.3876E-03

-1.6518E-03

1.9023E-04

-9.7726E-06

0.0000E+00

S3

-3.5567E-03

8.5020E-04

-1.0795E-04

5.4752E-06

0.0000E+00

S4

-1.2044E-02

3.3478E-03

-5.2912E-04

3.6205E-05

0.0000E+00

S5

-1.2307E-01

5.7335E-02

-1.6994E-02

2.8911E-03

-2.1492E-04

0.0000E+00

S6

6.6678E-03

-1.7437E-03

2.0452E-04

-5.6188E-06

0.0000E+00

S7

-2.7540E-01

1.1481E-01

-2.7493E-02

2.8688E-03

0.0000E+00

S8

1.6170E+00

-5.7506E-01

1.1688E-01

-1.0348E-02

0.0000E+00

S9

-7.4989E-01

2.6588E-01

-5.3842E-02

4.7194E-03

0.0000E+00

S10

-6.8724E-03

1.5469E-03

-2.0247E-04

1.1696E-05

0.0000E+00

S11

1.3372E-02

-4.0937E-03

8.3525E-04

-1.0758E-04

7.8857E-06

-2.5041E-07

S12

-4.5644E-04

4.6737E-05

-2.6973E-06

6.6073E-08

0.0000E+00

Table 12

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

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

Example seven

As shown in fig. 31 to 35, an imaging lens of example seven of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 31 shows a schematic diagram of an imaging lens configuration of example seven.

As shown in fig. 31, the image capturing lens includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 6.51mm, and the maximum field angle FOV of the imaging lens is 47.9 °.

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

TABLE 13

Table 14 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 that can be used for each of the aspherical mirrors S1-S12 in example seven.

TABLE 14

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

As can be seen from fig. 32 to 35, the imaging lens given in example seven can achieve good imaging quality.

Example eight

As shown in fig. 36 to 40, an imaging lens of example eight of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 36 shows a schematic view of an imaging lens configuration of example eight.

As shown in fig. 36, the image capturing lens includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 6.71mm, and the maximum field angle FOV of the imaging lens is 48.3 °.

Table 15 shows a basic structural parameter table of an imaging lens of example eight, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 15

Table 16 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26 that can be used for each of the aspherical mirrors S1-S12 in example eight.

Table 16

Fig. 37 shows an on-axis chromatic aberration curve of the imaging lens of example eight, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the imaging lens. Fig. 38 shows an astigmatism curve of the imaging lens of example eight, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 39 shows a distortion curve of the imaging lens of example eight, which represents distortion magnitude values corresponding to different angles of view. Fig. 40 shows a magnification chromatic aberration curve of the imaging lens of example eight, which represents the deviation of different image heights on the imaging plane after light passes through the imaging lens.

As can be seen from fig. 37 to 40, the imaging lens given in example eight can achieve good imaging quality.

Example nine

As shown in fig. 41 to 45, an imaging lens according to an example nine of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 41 shows a schematic view of an imaging lens configuration of example nine.

As shown in fig. 41, the image capturing lens includes, in order from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging plane S15.

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

In this example, the total effective focal length f of the imaging lens is 7.3mm, and the maximum field angle FOV of the imaging lens is 48.5 °.

Table 17 shows a basic structural parameter table of an imaging lens of example nine, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

Face number	Surface type	Radius of curvature	Thickness of (L)	Material	Coefficient of taper
						OBJ	Spherical surface	Infinity is provided	Infinity is provided	Refractive index	Abbe number
STO	Spherical surface	Infinity is provided	-0.8479
						S1	Aspherical surface	2.2939	1.2008	1.546	56.09	0.0276
S2	Aspherical surface	22.5700	0.0440		73.1955
						S3	Aspherical surface	6.2613	0.3188	1.677	19.24	-0.7824
S4	Aspherical surface	2.7456	0.2487		0.0216
						S5	Aspherical surface	3.4715	0.5818	1.546	56.09	-0.1061
S6	Aspherical surface	5.7053	0.6886		1.6967
						S7	Aspherical surface	11.4414	0.2342	1.546	56.09	6.1878
S8	Aspherical surface	4.6471	0.8896		-0.8869
						S9	Aspherical surface	-445.3650	0.4684	1.677	19.24	-99.0000
S10	Aspherical surface	-12.4677	1.0112		7.8480
						S11	Aspherical surface	-5.5147	0.2858	1.546	56.09	0.5572
S12	Aspherical surface	11.7526	0.1113		-7.0286
						S13	Spherical surface	Infinity is provided	0.2100	1.518	64.17
S14	Spherical surface	Infinity is provided	0.6068
						S15	Spherical surface	Infinity is provided

TABLE 17

Table 18 shows the higher order coefficients 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-S12 in example nine.

TABLE 18

Fig. 42 shows an on-axis chromatic aberration curve of the imaging lens of example nine, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the imaging lens. Fig. 43 shows an astigmatism curve of the imaging lens of example nine, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 44 shows a distortion curve of an imaging lens of example nine, which represents distortion magnitude values corresponding to different angles of view. Fig. 45 shows a magnification chromatic aberration curve of an imaging lens of example nine, which represents a deviation of different image heights on an imaging plane after light passes through the imaging lens.

As can be seen from fig. 42 to 45, the imaging lens given as example nine can achieve good imaging quality.

In summary, examples one to nine satisfy the relationships shown in table 19, respectively.

Condition/example	1	2	3	4	5	6	7	8	9
										Fno*Tan(FOV)	2.05	2.04	1.87	1.92	1.97	1.83	1.88	1.90	2.02
EPD/Tan(FOV)	3.42	3.51	3.76	3.66	3.50	3.63	3.46	3.52	3.61
										f/(T34+T45)	5.15	4.52	4.87	5.47	5.56	5.71	6.11	5.84	4.63
TTL/Tan(FOV)	5.94	6.14	6.09	6.35	6.19	6.31	6.28	6.23	6.11
										EPD/(CT3+CT4)	4.14	4.64	4.37	4.04	4.29	4.93	5.15	5.48	5.00
f/(CT5+T56)	5.13	4.83	6.17	5.67	5.74	3.93	3.77	3.85	4.94
										f/(CT1+CT2+CT3)	3.50	3.37	3.16	3.18	3.25	3.46	3.46	3.72	3.48
(CT2+CT4)/CT3	0.78	1.01	0.79	0.76	0.79	0.76	0.74	0.93	0.95
										f1/CT1	5.99	3.72	4.55	4.57	4.65	4.76	3.85	5.25	3.82
DT11/DT32	1.31	1.40	1.31	1.33	1.32	1.27	1.32	1.31	1.39
										DT62/DT41	1.74	1.98	1.58	1.61	1.71	1.80	2.14	2.06	1.88
EPD/(DT32+DT41)	1.38	1.45	1.37	1.37	1.35	1.33	1.38	1.37	1.44
										f/f4	-0.58	-0.49	-0.56	-0.49	-0.22	-0.42	-0.38	-0.44	-0.50
f/\|f5\|	0.42	0.40	0.22	0.18	0.24	0.02	0.38	0.13	0.39
										(f3-f6)/f1	2.76	4.85	2.53	4.01	7.44	2.99	6.10	6.31	4.74
f/R4-f/R5	1.24	0.57	1.19	1.59	1.62	1.15	1.64	1.71	0.56
										f/(R3+R4)	1.41	0.73	1.34	1.26	1.26	1.15	0.87	1.08	0.81
f/R7+f/R8	2.29	2.05	3.08	2.68	2.83	1.84	1.63	2.00	2.21

TABLE 19

Table 20 shows the effective focal lengths f of the imaging lenses of examples one to nine, the effective focal lengths f1 to f9 of the respective lenses, and the maximum field angle FOV.

Table 20

The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the above-described imaging lens.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

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 exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An imaging lens, characterized by comprising, in order from an object side of the imaging lens to an image side of the imaging lens along an optical axis direction of the imaging lens:

a first lens having positive optical power;

a second lens;

a third lens having positive optical power;

a fourth lens having negative optical power;

A fifth lens;

a sixth lens having negative optical power;

wherein, satisfy between the F number Fno of the camera lens and the maximum angle FOV of view of the camera lens: 1.6.ltoreq.FNo.ltoreq.2.1;

an effective focal length f of the imaging lens, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: f/(T34+T45) is not more than 4.5 and is not more than 6.5;

the effective focal length f of the imaging lens, the center thickness CT5 of the fifth lens, and the air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3<f/(CT5+T56) <6.5.

2. The imaging lens of claim 1, wherein an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the imaging lens and a maximum field angle FOV of the imaging lens satisfy: 5.5mm < TTL/TAN (FOV) is less than or equal to 7.0mm.

3. The imaging lens according to claim 1, wherein an entrance pupil diameter EPD of the imaging lens, a center thickness CT3 of the third lens, and a center thickness CT4 of the fourth lens satisfy: 4.ltoreq.EPD/(CT3+CT4) <6.0.

4. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens, a center thickness CT1 of the first lens, a center thickness CT2 of the second lens, and a center thickness CT3 of the third lens satisfy: 3.0< f/(CT1+CT2+CT3) <4.0.

5. The imaging lens according to claim 1, wherein a center thickness CT2 of the second lens, a center thickness CT3 of the third lens, and a center thickness CT4 of the fourth lens satisfy: the ratio of (CT2+CT4)/CT 3 is less than or equal to 0.7 and less than 1.1.

6. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens and a center thickness CT1 of the first lens satisfy: 3.5< f1/CT1 is less than or equal to 6.0.

7. The imaging lens according to claim 1, wherein a maximum effective radius DT11 of an object side surface of the first lens and a maximum effective radius DT32 of an image side surface of the third lens satisfy: 1.2< DT11/DT32<1.5.

8. The imaging lens according to claim 1, wherein a maximum effective radius DT41 of an object side surface of the fourth lens and a maximum effective radius DT62 of an image side surface of the sixth lens satisfy: 1.5< DT62/DT41<2.2.

9. The imaging lens according to claim 1, wherein 1.3+.epd/(dt32+dt41) <1.5 is satisfied among an entrance pupil diameter EPD of the imaging lens, a maximum effective radius DT32 of an image side surface of the third lens, and a maximum effective radius DT41 of an object side surface of the fourth lens.

10. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens and an effective focal length f4 of the fourth lens satisfy: -0.6.ltoreq.f/f 4<0.

11. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens and an effective focal length f5 of the fifth lens satisfy: f/|f5| <0.5.

12. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens, an effective focal length f3 of the third lens, and an effective focal length f6 of the sixth lens satisfy: and (f 3-f 6)/f 1 is less than or equal to 2.5 and less than 8.0.

13. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens, a radius of curvature R4 of an image side surface of the second lens, and a radius of curvature R5 of an object side surface of the third lens satisfy: 0.5< f/R4-f/R5<2.0.

14. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens, a radius of curvature R3 of an object side surface of the second lens, and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.5< f/(R3+R4) <1.5.

15. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens, a radius of curvature R7 of an object side surface of the fourth lens, and a radius of curvature R8 of an image side surface of the fourth lens satisfy: 1.5< f/R7+fR8 <3.5.

16. An imaging lens, characterized by comprising, in order from an object side of the imaging lens to an image side of the imaging lens along an optical axis direction of the imaging lens:

a first lens having positive optical power;

a second lens;

a third lens having positive optical power;

a fourth lens having negative optical power;

a fifth lens;

a sixth lens having negative optical power;

an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the imaging lens and a maximum field angle FOV of the imaging lens satisfy: 5.5mm < TTL/TAN (FOV) is less than or equal to 7.0mm;

17. The imaging lens according to claim 16, wherein an entrance pupil diameter EPD of the imaging lens, a center thickness CT3 of the third lens, and a center thickness CT4 of the fourth lens satisfy: 4.ltoreq.EPD/(CT3+CT4) <6.0.

18. The imaging lens according to claim 16, wherein 3.0< f/(CT 1+ct2+ct 3) <4.0 is satisfied among an effective focal length f of the imaging lens, a center thickness CT1 of the first lens, a center thickness CT2 of the second lens, and a center thickness CT3 of the third lens.

19. The imaging lens according to claim 16, wherein a center thickness CT2 of the second lens, a center thickness CT3 of the third lens, and a center thickness CT4 of the fourth lens satisfy: the ratio of (CT2+CT4)/CT 3 is less than or equal to 0.7 and less than 1.1.

20. The imaging lens according to claim 16, wherein an effective focal length f1 of the first lens and a center thickness CT1 of the first lens satisfy: 3.5< f1/CT1 is less than or equal to 6.0.

21. The imaging lens system according to claim 16, wherein a maximum effective radius DT11 of an object side surface of the first lens element and a maximum effective radius DT32 of an image side surface of the third lens element satisfy: 1.2< DT11/DT32<1.5.

22. The imaging lens system according to claim 16, wherein a maximum effective radius DT41 of an object-side surface of the fourth lens element and a maximum effective radius DT62 of an image-side surface of the sixth lens element satisfy: 1.5< DT62/DT41<2.2.

23. The imaging lens according to claim 16, wherein 1.3+.epd/(dt32+dt41) <1.5 is satisfied between an entrance pupil diameter EPD of the imaging lens, a maximum effective radius DT32 of an image side surface of the third lens, and a maximum effective radius DT41 of an object side surface of the fourth lens.

24. The imaging lens according to claim 16, wherein an effective focal length f of the imaging lens and an effective focal length f4 of the fourth lens satisfy: -0.6.ltoreq.f/f 4<0.

25. The imaging lens according to claim 16, wherein an effective focal length f of the imaging lens and an effective focal length f5 of the fifth lens satisfy: f/|f5| <0.5.

26. The imaging lens according to claim 16, wherein an effective focal length f1 of the first lens, an effective focal length f3 of the third lens, and an effective focal length f6 of the sixth lens satisfy: and (f 3-f 6)/f 1 is less than or equal to 2.5 and less than 8.0.

27. The imaging lens system according to claim 16, wherein an effective focal length f of the imaging lens system, a radius of curvature R4 of an image side surface of the second lens, and a radius of curvature R5 of an object side surface of the third lens satisfy: 0.5< f/R4-f/R5<2.0.

28. The imaging lens according to claim 16, wherein an effective focal length f of the imaging lens, a radius of curvature R3 of an object side surface of the second lens, and a radius of curvature R4 of an image side surface of the second lens satisfy: 0.5< f/(R3+R4) <1.5.

29. The imaging lens system according to claim 16, wherein an effective focal length f of the imaging lens system, a radius of curvature R7 of an object-side surface of the fourth lens element, and a radius of curvature R8 of an image-side surface of the fourth lens element satisfy: 1.5< f/R7+fR8 <3.5.