CN114594578B - Image pickup lens - Google Patents

Abstract

The invention provides an imaging lens. The imaging lens sequentially comprises from an object side to an image side along an optical axis: a first lens having negative optical power; a second lens having positive optical power; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having positive optical power; a sixth lens having negative optical power; the method comprises the following steps that the half ImgH of the diagonal line length of an effective pixel area on an imaging surface and the maximum field angle FOV of an imaging lens meet the following conditions: 4.0mm < imgh tan (FOV/3) <5.0mm; the center thicknesses CT1 and CT3 of the first and third lenses and the air interval T12 between the first and second lenses on the optical axis satisfy: 2.5< (CT1+T12)/CT 3<4.0. The invention solves the problem that the ultra-wide angle and high image quality of the camera lens in the prior art are difficult to realize simultaneously.

Description

Image pickup lens

The invention is a divisional application of patent application with the application number of 202111302596.7 and the name of 'image pick-up lens' of 2021, 11 and 04.

Technical Field

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

Background

In recent years, with the rapid development of smart phones, the trend of using mobile phone photographing to replace a traditional camera is more and more obvious, and the mass is more and more favored for mobile phones with high-quality photographing function. The types of the photographing lens are various, and the wide-angle lens is taken as an example, so that a picture photographed by the wide-angle lens can have a wide background while highlighting the central main body and the foreground, more sceneries can be photographed in a smaller environment, the infectivity of the picture is enhanced, and a photographer has an immersive feeling. However, the wide-angle lens in the prior art has the problems of difficult distortion improvement and difficult chromatic aberration optimization, and is difficult to meet the high image quality requirement of customers.

That is, the imaging lens in the related art has a problem in that it is difficult to achieve both ultra-wide angle and high image quality.

Disclosure of Invention

The invention mainly aims to provide an imaging lens, which solves the problem that the ultra-wide angle and high image quality of the imaging lens in the prior art are difficult to realize at the same time.

In order to achieve the above object, the present invention provides an imaging lens comprising, in order from an object side to an image side along an optical axis: a first lens having negative optical power; a second lens having positive optical power; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having positive optical power; a sixth lens having negative optical power; the method comprises the following steps that the half ImgH of the diagonal line length of an effective pixel area on an imaging surface and the maximum field angle FOV of an imaging lens meet the following conditions: 4.0mm < imgh tan (FOV/3) <5.0mm; the center thicknesses CT1 and CT3 of the first and third lenses and the air interval T12 between the first and second lenses on the optical axis satisfy: 2.5< (CT1+T12)/CT 3<4.0.

Further, the effective focal length f of the imaging lens and the center thickness CT1 of the first lens satisfy: 1.4< f/CT1<3.5.

Further, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT61 of the object side surface of the sixth lens satisfy: DT11/DT61 is 1.0.ltoreq.1.6.

Further, the imaging lens satisfies at least one of the following conditions: the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, and the edge thickness ET1 of the first lens satisfy: 0.7< (DT 11-DT 12)/ET 1<1.5; the edge thickness ET1 of the first lens, the sagittal height SAG11 of the object-side surface of the first lens at the maximum effective radius, and the sagittal height SAG12 of the image-side surface of the first lens at the maximum effective radius satisfy: 3.0< ET1/(SAG 12-SAG 11) <4.5.

Further, the imaging lens satisfies at least one of the following conditions: the maximum effective radius DT12 of the image side surface of the first lens, the maximum effective radius DT62 of the image side surface of the sixth lens, and the maximum effective radius DTs of the aperture stop satisfy: (DT 62-DT 12)/DTs <3.0; the center thickness CT1 of the first lens and the center thickness CT3 of the third lens satisfy: 0.8< CT1/CT3<2.0.

Further, the imaging lens satisfies at least one of the following conditions: the edge thickness ET4 of the fourth lens and the object-side surface of the fourth lens satisfy between the sagittal height SAG41 at the maximum effective radius: -4.5< ET4/SAG41< -1.5; the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens satisfy: 1.5< ET4/CT4 is less than or equal to 2.0.

Further, the imaging lens satisfies at least one of the following conditions: the effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens satisfy: f5/f is more than or equal to 1.0 and less than or equal to 1.5; the effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens satisfy: -3.0.ltoreq.f6/f < -1.5.

Further, the imaging lens satisfies at least one of the following conditions: the effective focal length f of the imaging lens, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy the following conditions: -1.0< f/f1+f4 < -0.7; the effective focal length f of the imaging lens, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following conditions: 3.5< (f 2-f 3)/f <7.0.

Further, the imaging lens satisfies at least one of the following conditions: the effective focal length f of the imaging lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: f/(R5+R6) is 1.0.ltoreq.f <3.0; the effective focal length f of the imaging lens and the curvature radius R1 of the object side surface of the first lens satisfy the following conditions: -1.0< f/R1< -0.5.

Further, the imaging lens satisfies at least one of the following conditions: 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: 2.0< f/(R4-R3) <4.5; the effective focal length f of the imaging lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -2.1< f/R10< -1.3.

By applying the technical scheme of the invention, the imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, wherein the first lens has negative focal power; the second lens has positive optical power; the third lens has positive focal power; the fourth lens has negative focal power; the fifth lens has positive focal power; the sixth lens has negative focal power; the method comprises the following steps that the half ImgH of the diagonal line length of an effective pixel area on an imaging surface and the maximum field angle FOV of an imaging lens meet the following conditions: 4.0mm < imgh tan (FOV/3) <5.0mm; the center thicknesses CT1 and CT3 of the first and third lenses and the air interval T12 between the first and second lenses on the optical axis satisfy: 2.5< (CT1+T12)/CT 3<4.0.

The focal power of each lens is reasonably distributed, so that the aberration generated by the imaging lens is balanced, and the imaging quality of the imaging lens is greatly improved. The front 3 lenses adopt a negative-positive combination mode, so that the performance of the optical system can be better displayed, and the effect of a large field angle can be effectively met. The condition between half of the diagonal line length ImgH of the effective pixel area on the imaging surface and the maximum field angle FOV of the imaging lens is restrained within a reasonable range, the focal power of the first lens can be effectively controlled to be negative, the focal power between the lenses can be reasonably distributed, the optical performance is fully exerted, meanwhile, the imaging lens can be favorably ensured to be matched with a larger chip, a wider field angle is obtained, the characteristic of ultra-wide angle is ensured, and therefore the imaging lens can obtain better imaging quality. By restricting the relation between the central thickness CT1 of the first lens, the central thickness CT3 of the third lens and the air interval T12 of the first lens and the second lens on the optical axis, the manufacturability of the lenses can be improved, the sensitivity of the lenses can be reduced, and the yield of the system can be improved on the premise of optimizing balance aberration.

Drawings

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

fig. 1 is a schematic diagram showing 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.

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

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

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

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

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

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

The invention provides an imaging lens, which aims to solve the problem that the ultra-wide angle and high image quality of the imaging lens in the prior art are difficult to realize at the same time.

As shown in fig. 1 to 30, the imaging lens includes, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, the first lens having negative optical power; the second lens has positive optical power; the third lens has positive focal power; the fourth lens has negative focal power; the fifth lens has positive focal power; the sixth lens has negative focal power; the method comprises the following steps that the half ImgH of the diagonal line length of an effective pixel area on an imaging surface and the maximum field angle FOV of an imaging lens meet the following conditions: 4.0mm < imgh tan (FOV/3) <5.0mm; the center thicknesses CT1 and CT3 of the first and third lenses and the air interval T12 between the first and second lenses on the optical axis satisfy: 2.5< (CT1+T12)/CT 3<4.0.

The focal power of each lens is reasonably distributed, so that the aberration generated by the imaging lens is balanced, and the imaging quality of the imaging lens is greatly improved. The front 3 lenses adopt a negative-positive combination mode, so that the performance of the optical system can be better displayed, and the effect of a large field angle can be effectively met. The condition between half of the diagonal line length ImgH of the effective pixel area on the imaging surface and the maximum field angle FOV of the imaging lens is restrained within a reasonable range, the focal power of the first lens can be effectively controlled to be negative, the focal power between the lenses can be reasonably distributed, the optical performance is fully exerted, meanwhile, the imaging lens can be favorably ensured to be matched with a larger chip, a wider field angle is obtained, the characteristic of ultra-wide angle is ensured, and therefore the imaging lens can obtain better imaging quality. By restricting the relation between the central thickness CT1 of the first lens, the central thickness CT3 of the third lens and the air interval T12 of the first lens and the second lens on the optical axis, the manufacturability of the lenses can be improved, the sensitivity of the lenses can be reduced, and the yield of the system can be improved on the premise of optimizing balance aberration.

In the present embodiment, the effective focal length f of the imaging lens and the center thickness CT1 of the first lens satisfy: 1.4< f/CT1<3.5. The method meets the conditional expression, is favorable for reasonable distribution of the center thickness of the first lens, and ensures the rationality of the structure.

In the present embodiment, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT61 of the object side surface of the sixth lens satisfy: DT11/DT61 is 1.0.ltoreq.1.6. The condition is satisfied, which is beneficial to controlling the effective radius of the first lens and the sixth lens, so that the optical system has stable assembly manufacturability and workability.

In the present embodiment, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, and the edge thickness ET1 of the first lens satisfy the following conditions: 0.7< (DT 11-DT 12)/ET 1<1.5. The light beam refractive lens has the advantages that the light beam refractive lens can ensure stable transmission after entering the system, meanwhile, the arrangement of the first lens and the second lens in the system is facilitated, the eccentric sensitivity of the first lens and the second lens is reduced, and the assembly yield is improved. Preferably 0.7< (DT 11-DT 12)/ET 1<1.3.

In the present embodiment, the edge thickness ET1 of the first lens, the sagittal height SAG11 of the object-side surface of the first lens at the maximum effective radius, and the sagittal height SAG12 of the image-side surface of the first lens at the maximum effective radius satisfy: 3.0< ET1/(SAG 12-SAG 11) <4.5. The method meets the conditional expression, is favorable for controlling the relation between the edge thickness and the sagittal height of the first lens, can improve the light convergence capacity of the first lens, and ensures that the system has the characteristic of large view field angle.

In the present embodiment, the maximum effective radius DT12 of the image side surface of the first lens, the maximum effective radius DT62 of the image side surface of the sixth lens, and the maximum effective radius DTs of the aperture stop satisfy the following conditions: the ratio of DT62-DT12 to DTs is less than or equal to 1.7 and less than 3.0. The relation between the maximum effective radius DT12 of the image side surface of the first lens and the maximum effective radius DT62 of the image side surface of the sixth lens and the maximum effective radius DTs of the aperture diaphragm is restrained, so that the imaging lens is in a certain aperture range, the size of luminous flux entering the imaging lens is improved, clear imaging can be realized under the condition of enough light passing through the imaging lens, and meanwhile, the smaller size design of the imaging lens is maintained, and miniaturization is guaranteed. Preferably, 1.7.ltoreq.DT 62-DT 12/DTs <2.8.

In the present embodiment, the center thickness CT1 of the first lens and the center thickness CT3 of the third lens satisfy: 0.8< CT1/CT3<2.0. Satisfying this conditional expression is advantageous in controlling the center thickness between the first lens and the third lens, making the optical system processable.

In the present embodiment, the edge thickness ET4 of the fourth lens and the sagittal height SAG41 of the object side surface of the fourth lens at the maximum effective radius satisfy: -4.5< ET4/SAG41< -1.5. The method meets the conditional expression, improves the manufacturability of the lens, reduces the sensitivity of the lens and improves the yield of the system on the premise of optimizing the balance aberration. Preferably, -4.2< ET4/SAG41< -1.6.

In the present embodiment, the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens satisfy: 1.5< ET4/CT4 is less than or equal to 2.0. By restricting the ratio between the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens within a reasonable range, manufacturability of the fourth lens can be ensured while facilitating stability of assembly. Preferably, 1.7< ET4/CT 4.ltoreq.2.0.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens satisfy: f5/f is more than or equal to 1.0 and less than or equal to 1.5. The method can effectively control the effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens, ensure that the fifth lens is a positive lens, and effectively and reasonably distribute the focal power so as to meet the design requirement of a wide-angle system. Preferably, 1.0.ltoreq.f5/f <1.4.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens satisfy: -3.0.ltoreq.f6/f < -1.5. The method can effectively control the effective focal length f of the imaging lens and the effective focal length f6 of the sixth lens, ensure that the sixth lens is a negative lens, and effectively and reasonably distribute the focal power so as to meet the design requirement of a wide-angle system. Preferably, -3.0.ltoreq.f6/f < -1.8.

In the present embodiment, the effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f4 of the fourth lens satisfy: -1.0< f/f1+f4 < -0.7. The method meets the conditional expression, is favorable for improving the focal power of the first lens, reduces the sensitivity of the first lens, and can effectively reduce the chromatic aberration of magnification of the system.

In the present embodiment, the effective focal length f of the imaging lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 3.5< (f 2-f 3)/f <7.0. The conditional expression is satisfied, so that the decentration and thickness sensitivity of the second lens are reduced, and the processing performance of the lens is improved. Preferably 3.6< (f 2-f 3)/f <6.8.

In the present embodiment, the effective focal length f of the imaging lens, the radius of curvature R5 of the object side surface of the third lens, and the radius of curvature R6 of the image side surface of the third lens satisfy: f/(R5+R6) is 1.0.ltoreq.f <3.0. The lens meets the conditional expression, is favorable for improving the focal power of the third lens, reduces the sensitivity of the third lens and can improve the performance yield of the lens. Preferably, 1.0.ltoreq.f/(R5+R6) <2.6.

In the present embodiment, the effective focal length f of the imaging lens and the radius of curvature R1 of the object side surface of the first lens satisfy: -1.0< f/R1< -0.5. The curvature of the object side surface of the first lens is controlled to be negative when the conditional expression is satisfied, the optical power can be restricted to be reasonably distributed, and the upper performance limit of the optical system is improved. Preferably, -0.9< f/R1< -0.5.

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: 2.0< f/(R4-R3) <4.5. The optical power of the second lens is favorably distributed in the whole optical system, the curvature of field can be comprehensively balanced to a certain extent, the vertical axis chromatic aberration of the system is reduced, and meanwhile, the manufacturability of the second lens is favorably optimized. Preferably, 2.1< f/(R4-R3) <4.4.

In the present embodiment, the effective focal length f of the imaging lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -2.1< f/R10< -1.3. Satisfying this condition is advantageous in optimizing the shape of the fifth lens, by which the curvature of field of the system can be balanced while improving the ghost image generated by the reflection associated with the fifth lens.

The above-described image pickup lens may optionally further include a filter for correcting color deviation 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 left side is the object side and the right side is the image side. The imaging lens also has a large aperture and a large angle of view. The advantages of ultra-thin and good imaging quality can meet the miniaturization requirement of intelligent electronic products.

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

However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in the present specification without departing from the technical solutions claimed herein. 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.

Any of the following examples one to six is applicable to the embodiments of the present application.

Example one

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

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

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has 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 2.11mm, and the maximum field angle FOV of the imaging lens is 125.3 °.

Table 1 shows a basic structural parameter table of an imaging lens of example one, in which units of a radius of curvature, a thickness/distance, a focal length, and an effective radius are 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, A28, A30 that can be used for each of the aspherical mirrors S1-S12 in example one.

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 of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 6 shows a schematic diagram of an imaging lens structure of example two.

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

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has 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 1.81mm, and the maximum field angle FOV of the imaging lens is 151.2 °.

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, focal length, and effective radius are all millimeters (mm).

TABLE 3 Table 3

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

Face number

A4

A6

A8

A10

A12

A14

A16

S1

1.5853E-01

-1.2909E-01

1.0298E-01

-6.9311E-02

3.6286E-02

-1.4334E-02

4.2252E-03

S2

1.8000E-01

1.5222E-02

-6.6916E-01

2.0413E+00

-3.6134E+00

4.1326E+00

-3.1294E+00

S3

4.3440E-02

8.9336E-01

-1.5531E+01

1.3898E+02

-8.0264E+02

3.1602E+03

-8.7247E+03

S4

7.0506E-02

-3.5951E-01

-1.1704E+01

4.0952E+02

-6.0283E+03

5.3364E+04

-3.1331E+05

S5

-8.0994E-03

-3.2235E-02

3.7147E-01

-2.1243E+00

5.5088E+00

-8.1437E+00

7.6655E+00

S6

-1.4401E-01

-5.7822E-02

4.7400E+00

-7.3678E+01

6.9228E+02

-4.2777E+03

1.8038E+04

S7

-4.7540E-01

2.0183E+00

-2.3080E+01

1.9987E+02

-1.1981E+03

5.0820E+03

-1.5524E+04

S8

-2.4429E-01

2.0772E-01

-1.6731E-03

-2.9584E-01

6.5230E-01

-9.9200E-01

1.0711E+00

S9

1.6164E-01

-7.0458E-01

2.7295E+00

-7.0426E+00

1.2482E+01

-1.5458E+01

1.3525E+01

S10

2.6062E-01

-1.1631E+00

4.2112E+00

-1.0293E+01

1.7581E+01

-2.1385E+01

1.8740E+01

S11

-2.0246E-01

-1.7800E-01

5.8009E-01

-7.1618E-01

5.3134E-01

-2.6072E-01

8.8241E-02

S12

-5.2300E-01

4.2120E-01

-2.5516E-01

1.0661E-01

-3.0249E-02

5.7661E-03

-7.0935E-04

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-9.2274E-04

1.4783E-04

-1.7074E-05

1.3789E-06

-7.3683E-08

2.3360E-09

-3.3212E-11

S2

1.5610E+00

-4.9536E-01

9.1252E-02

-7.3940E-03

-6.3984E-05

-5.2805E-06

7.0703E-06

S3

1.7137E+04

-2.4023E+04

2.3824E+04

-1.6305E+04

7.3188E+03

-1.9376E+03

2.2923E+02

S4

1.2724E+06

-3.6326E+06

7.2738E+06

-9.9985E+06

8.9784E+06

-4.7381E+06

1.1130E+06

S5

-4.8451E+00

2.1024E+00

-6.2624E-01

1.2523E-01

-1.5932E-02

1.1492E-03

-3.4906E-05

S6

-5.3083E+04

1.0997E+05

-1.5952E+05

1.5841E+05

-1.0248E+05

3.8874E+04

-6.5536E+03

S7

3.4419E+04

-5.5322E+04

6.3687E+04

-5.1101E+04

2.7105E+04

-8.5330E+03

1.2063E+03

S8

-8.0593E-01

4.2176E-01

-1.5299E-01

3.7790E-02

-6.0751E-03

5.7413E-04

-2.4238E-05

S9

-8.4174E+00

3.7267E+00

-1.1623E+00

2.4904E-01

-3.4833E-02

2.8593E-03

-1.0430E-04

S10

-1.1870E+01

5.4070E+00

-1.7456E+00

3.8826E-01

-5.6423E-02

4.8132E-03

-1.8252E-04

S11

-2.1045E-02

3.5639E-03

-4.2610E-04

3.5159E-05

-1.9051E-06

6.1013E-08

-8.7519E-10

S12

4.7612E-05

1.2897E-07

-3.6290E-07

3.6577E-08

-1.8626E-09

5.0590E-11

-5.8317E-13

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. Fig. 11 shows a schematic diagram of an imaging lens structure of example three.

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

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has 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 1.64mm, and the maximum field angle FOV of the imaging lens is 159.0 °.

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, focal length, and effective radius are all millimeters (mm).

TABLE 5

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

Face number

A4

A6

A8

A10

A12

A14

A16

S1

3.0984E-01

-2.6596E-01

1.9094E-01

-1.0577E-01

4.3925E-02

-1.3607E-02

3.1457E-03

S2

1.7696E-01

6.3596E-01

-2.9881E+00

7.0545E+00

-1.0857E+01

1.1633E+01

-8.9501E+00

S3

3.3580E-02

1.3270E+00

-1.8232E+01

1.4164E+02

-7.2728E+02

2.5796E+03

-6.4860E+03

S4

1.5365E-01

-3.5601E+00

6.5530E+01

-7.7225E+02

6.2917E+03

-3.7413E+04

1.6836E+05

S5

-6.7902E-03

1.0407E-01

-9.3935E-01

4.7631E+00

-1.6817E+01

3.8397E+01

-5.6865E+01

S6

-7.9096E-02

-1.3412E+00

2.4589E+01

-2.8420E+02

2.1718E+03

-1.1420E+04

4.2301E+04

S7

-4.4973E-01

7.8014E-01

-1.1272E+00

2.7818E+00

-6.2096E+01

5.1778E+02

-2.3123E+03

S8

-3.6139E-01

8.6401E-01

-1.8828E+00

3.4229E+00

-4.4565E+00

3.8616E+00

-2.1334E+00

S9

-5.7842E-03

-7.5789E-02

1.3607E-01

-1.5682E-01

1.6203E-01

-1.3439E-01

7.8760E-02

S10

1.6932E-01

-7.8764E-01

2.7590E+00

-6.0655E+00

8.9920E+00

-9.4963E+00

7.3607E+00

S11

-2.6218E-01

-3.1408E-02

4.2392E-01

-6.4997E-01

5.4588E-01

-2.9410E-01

1.0801E-01

S12

-5.4963E-01

5.0767E-01

-3.6701E-01

1.8893E-01

-6.9431E-02

1.8536E-02

-3.6438E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-5.4197E-04

6.9083E-05

-6.4103E-06

4.2003E-07

-1.8386E-08

4.8172E-10

-5.7057E-12

S2

5.0156E+00

-2.0516E+00

6.0624E-01

-1.2605E-01

1.7497E-02

-1.4557E-03

5.4907E-05

S3

1.1711E+04

-1.5207E+04

1.4053E+04

-9.0018E+03

3.7932E+03

-9.4455E+02

1.0520E+02

S4

-5.8353E+05

1.5558E+06

-3.1276E+06

4.5571E+06

-4.5089E+06

2.6920E+06

-7.2813E+05

S5

5.6244E+01

-3.7945E+01

1.7550E+01

-5.4823E+00

1.1065E+00

-1.3036E-01

6.8129E-03

S6

-1.1181E+05

2.1141E+05

-2.8327E+05

2.6223E+05

-1.5927E+05

5.7041E+04

-9.1204E+03

S7

6.5161E+03

-1.2360E+04

1.6118E+04

-1.4335E+04

8.3529E+03

-2.8878E+03

4.5063E+02

S8

6.7190E-01

-5.3228E-02

-4.8043E-02

2.2301E-02

-4.6213E-03

4.9398E-04

-2.2080E-05

S9

-3.1610E-02

8.7067E-03

-1.6455E-03

2.0998E-04

-1.7306E-05

8.3262E-07

-1.7775E-08

S10

-4.2312E+00

1.7963E+00

-5.5364E-01

1.1991E-01

-1.7233E-02

1.4710E-03

-5.6314E-05

S11

-2.7834E-02

5.0887E-03

-6.5715E-04

5.8632E-05

-3.4394E-06

1.1937E-07

-1.8572E-09

S12

5.2982E-04

-5.6662E-05

4.3838E-06

-2.3783E-07

8.5555E-09

-1.8282E-10

1.7533E-12

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. Fig. 16 shows a schematic diagram of an imaging lens structure of example four.

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

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has 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 1.67mm, and the maximum field angle FOV of the imaging lens is 156.0 °.

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, focal length, and effective radius are all millimeters (mm).

TABLE 7

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

Face number

A4

A6

A8

A10

A12

A14

A16

S1

1.0593E-01

-5.5651E-02

2.6542E-02

-1.0274E-02

3.0825E-03

-7.0379E-04

1.2123E-04

S2

1.1360E-01

1.5738E-01

-9.5450E-01

2.7694E+00

-5.3383E+00

7.1907E+00

-6.9090E+00

S3

1.1262E-01

7.8513E-02

-3.7071E+00

3.4998E+01

-2.1146E+02

8.6977E+02

-2.5187E+03

S4

2.1833E-01

-7.3557E+00

1.9419E+02

-3.2960E+03

3.8159E+04

-3.1218E+05

1.8423E+06

S5

1.3261E-02

-3.5099E-02

1.2904E-01

-5.4382E-01

-4.0276E-01

4.6495E+00

-9.4837E+00

S6

-1.3070E-01

-1.3466E+00

3.6305E+01

-5.0351E+02

4.4204E+03

-2.6139E+04

1.0755E+05

S7

-5.9159E-01

2.0326E+00

-2.2355E+01

2.1173E+02

-1.3840E+03

6.2911E+03

-2.0319E+04

S8

-3.4686E-01

3.9746E-01

9.2006E-02

-1.8444E+00

5.3392E+00

-9.4956E+00

1.1470E+01

S9

8.5870E-02

-3.2299E-01

7.8681E-01

-1.3125E+00

1.4857E+00

-1.1467E+00

6.0666E-01

S10

1.5784E-01

-5.2570E-01

1.7762E+00

-4.1223E+00

6.7406E+00

-7.9538E+00

6.8533E+00

S11

-2.6503E-01

-1.3099E-01

6.5928E-01

-1.0005E+00

9.2060E-01

-5.7378E-01

2.5050E-01

S12

-5.7882E-01

5.2830E-01

-3.8803E-01

2.1270E-01

-8.5788E-02

2.5302E-02

-5.4392E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-1.5642E-05

1.4956E-06

-1.0406E-07

5.1041E-09

-1.6687E-10

3.2572E-12

-2.8664E-14

S2

4.7799E+00

-2.3824E+00

8.4683E-01

-2.0932E-01

3.4189E-02

-3.3187E-03

1.4506E-04

S3

5.2211E+03

-7.7720E+03

8.2263E+03

-6.0302E+03

2.9043E+03

-8.2520E+02

1.0465E+02

S4

-7.9175E+06

2.4766E+07

-5.5726E+07

8.7779E+07

-9.1794E+07

5.7204E+07

-1.6068E+07

S5

1.0228E+01

-6.8680E+00

3.0229E+00

-8.7641E-01

1.6171E-01

-1.7247E-02

8.1060E-04

S6

-3.1341E+05

6.5023E+05

-9.5290E+05

9.6264E+05

-6.3702E+05

2.4826E+05

-4.3154E+04

S7

4.7153E+04

-7.8693E+04

9.3412E+04

-7.6781E+04

4.1445E+04

-1.3185E+04

1.8693E+03

S8

-9.6161E+00

5.6301E+00

-2.2906E+00

6.3434E-01

-1.1405E-01

1.2005E-02

-5.6177E-04

S9

-2.1604E-01

4.8026E-02

-4.8506E-03

-4.7278E-04

2.1589E-04

-2.6517E-05

1.1983E-06

S10

-4.3330E+00

2.0027E+00

-6.6641E-01

1.5478E-01

-2.3725E-02

2.1503E-03

-8.7078E-05

S11

-7.7515E-02

1.7031E-02

-2.6345E-03

2.8023E-04

-1.9502E-05

7.9938E-07

-1.4632E-08

S12

8.4768E-04

-9.4757E-05

7.4503E-06

-3.9807E-07

1.3586E-08

-2.6223E-10

2.1081E-12

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. Fig. 21 shows a schematic diagram of an imaging lens structure of example five.

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

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has 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 1.64mm, and the maximum field angle FOV of the imaging lens is 155.6 °.

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, focal length, and effective radius are all millimeters (mm).

TABLE 9

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

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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. Fig. 26 shows a schematic diagram of an imaging lens structure of example six.

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

The first lens element E1 has negative refractive power, wherein an object-side surface S1 of the first lens element is concave, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has 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 2.10mm, and the maximum field angle FOV of the imaging lens is 125.3 °.

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, focal length, and effective radius are millimeters (mm).

TABLE 11

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

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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.

In summary, examples one to six satisfy the relationships shown in table 13, respectively.

Condition/example	1	2	3	4	5	6
							ImgH*TAN(FOV/3)	3.03	4.10	4.50	4.34	4.32	3.03
f/CT1	3.12	1.92	3.40	1.47	1.71	3.00
							DT11/DT61	0.85	1.04	1.18	1.62	1.59	0.85
(DT11-DT12)/ET1	0.79	0.90	1.04	1.16	1.23	0.79
							ET1/(SAG12-SAG11)	4.14	3.26	1.89	3.50	3.33	4.25
(CT1+T12)/CT3	1.72	2.63	2.98	3.55	3.36	1.75
							CT1/CT3	1.16	1.62	0.83	1.91	1.64	1.21
ET4/SAG41	-4.13	-3.76	-1.65	-2.25	-2.13	-3.61
							ET4/CT4	1.75	1.87	1.97	1.87	1.91	1.79
(DT62-DT12)/DTs	2.65	2.57	1.85	1.95	1.71	2.77
							f5/f	1.03	1.15	1.32	1.37	1.36	1.05
f6/f	-1.85	-2.24	-2.94	-2.23	-2.23	-1.93
							f/f1+f/f4	-0.79	-0.88	-0.89	-0.93	-0.87	-0.80
(f2-f3)/f	6.77	4.36	3.68	3.62	3.90	6.47
							f/(R5+R6)	2.51	1.90	1.28	1.16	1.05	2.36
f/R1	-0.71	-0.67	-0.88	-0.53	-0.60	-0.71
							f/(R4-R3)	4.34	2.16	4.03	3.41	3.48	4.22
f/R10	-2.01	-1.86	-1.40	-1.43	-1.37	-1.98

Table 13 table 14 shows effective focal lengths f of imaging lenses of examples one to six, effective focal lengths f1 to f6 of the respective lenses, and the like.

TABLE 14

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

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

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

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

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

Claims (10)

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

a first lens having negative optical power;

a second lens having positive optical power;

a third lens having positive optical power;

a fourth lens having negative optical power;

a fifth lens having positive optical power;

a sixth lens having negative optical power;

the object side surface of the first lens is a concave surface, and the image side surface is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface is a convex surface; the image side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a concave surface, and the image side surface is a convex surface; the object side surface of the sixth lens is a convex surface, and the image side surface is a concave surface;

the camera lens consists of six lenses from the first lens to the sixth lens;

the imaging method comprises the following steps that the half ImgH of the diagonal line length of an effective pixel area on an imaging surface and the maximum field angle FOV of the imaging lens meet the following conditions: 4.0mm < imgh tan (FOV/3) <5.0mm; the center thicknesses CT1 and CT3 of the first and third lenses and the air interval T12 between the first and second lenses on the optical axis satisfy: 2.5< (CT1+T12)/CT 3<4.0; the effective focal length f of the imaging lens, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following conditions: 3.5< (f 2-f 3)/f <7.0.

2. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens and a center thickness CT1 of the first lens satisfy: 1.4< f/CT1<3.5.

3. 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 DT61 of an object side surface of the sixth lens satisfy: DT11/DT61 is 1.0.ltoreq.1.6.

4. The imaging lens according to claim 1, wherein the imaging lens satisfies at least one of the following conditions:

the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT12 of the image side surface of the first lens, and the edge thickness ET1 of the first lens satisfy: 0.7< (DT 11-DT 12)/ET 1<1.5;

the edge thickness ET1 of the first lens, the sagittal height SAG11 of the object-side surface of the first lens at the maximum effective radius, and the sagittal height SAG12 of the image-side surface of the first lens at the maximum effective radius satisfy: 3.0< ET1/(SAG 12-SAG 11) <4.5.

5. The imaging lens according to claim 1, wherein the imaging lens satisfies at least one of the following conditions:

the maximum effective radius DT12 of the image side surface of the first lens, the maximum effective radius DT62 of the image side surface of the sixth lens, and the maximum effective radius DTs of the aperture stop satisfy: (DT 62-DT 12)/DTs <3.0;

the center thickness CT1 of the first lens and the center thickness CT3 of the third lens satisfy: 0.8< CT1/CT3<2.0.

6. The imaging lens according to claim 1, wherein the imaging lens satisfies at least one of the following conditions:

the edge thickness ET4 of the fourth lens and the sagittal height SAG41 of the object side surface of the fourth lens at the maximum effective radius satisfy: -4.5< ET4/SAG41< -1.5;

the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens satisfy: 1.5< ET4/CT4 is less than or equal to 2.0.

7. The imaging lens according to claim 1, wherein the imaging lens satisfies at least one of the following conditions:

an effective focal length f of the imaging lens and an effective focal length f5 of the fifth lens satisfy: f5/f is more than or equal to 1.0 and less than or equal to 1.5;

an effective focal length f of the imaging lens and an effective focal length f6 of the sixth lens satisfy: -3.0.ltoreq.f6/f < -1.5.

8. The imaging lens according to claim 1, wherein the imaging lens satisfies at least one of the following conditions:

the effective focal length f of the imaging lens, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy the following conditions: -1.0< f/f1+f4 < -0.7.

9. The imaging lens according to claim 1, wherein the imaging lens satisfies at least one of the following conditions:

the effective focal length f of the imaging lens, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: f/(R5+R6) is 1.0.ltoreq.f <3.0;

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

10. The imaging lens according to claim 1, wherein the imaging lens satisfies at least one of the following conditions:

the effective focal length f of the imaging lens, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 2.0< f/(R4-R3) <4.5;

the effective focal length f of the imaging lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -2.1< f/R10< -1.3.