CN114326047B

CN114326047B - Imaging lens

Info

Publication number: CN114326047B
Application number: CN202210135552.8A
Authority: CN
Inventors: 朱晓晓; 徐武超; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-02-14
Filing date: 2022-02-14
Publication date: 2023-09-22
Anticipated expiration: 2042-02-14
Also published as: CN114326047A

Abstract

The present invention provides an imaging lens including: the first lens has positive focal power, and the surface of the first lens facing the light emergent side is a concave surface; the second lens has optical power, the surface of the second lens facing the light incident side is a convex surface, and the surface of the second lens facing the light emergent side is a concave surface; the third lens has optical power; the fourth lens has negative focal power, and the surface of the fourth lens facing the light emergent side is a concave surface; the fifth lens has positive focal power, the surface of the fifth lens facing the light incident side is a convex surface, and the surface of the fifth lens facing the light emergent side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light incident side is a convex surface, and the surface of the sixth lens facing the light emergent side is a concave surface; half of the diagonal length of an effective pixel area on an imaging surface of the imaging lens is ImgH, and the entrance pupil diameter EPD of the imaging lens and the effective focal length f of the imaging lens satisfy: 2.7mm < imgh epd/f <5mm. The invention solves the problems of miniaturization and incompatibility of high image quality of the imaging lens in the prior art.

Description

Imaging lens

Technical Field

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

Background

With the vigorous development of intelligent products, the demands of manufacturers of large electronic devices for lenses assembled on mobile terminals are increasing, and especially, the demands on the main cameras of high-end models are increasing. The large image surface and the large aperture of the lens are beneficial to realizing higher resolution and signal to noise ratio, meanwhile, the ultra-thin lens is beneficial to better compatibility and portability, the imaging capability and the competitive advantage of the lens can be greatly improved, and meanwhile, higher difficulty challenges are also provided for the design of the imaging lens.

That is, the imaging lens in the related art has a problem of being incompatible with high image quality in miniaturization.

Disclosure of Invention

The invention provides an imaging lens, which solves the problems of miniaturization and high image quality incompatibility of the imaging lens in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens including, from an light-in side to a light-out side: the first lens is provided with positive focal power, the surface of the first lens facing the light incident side is a convex surface, and the surface of the first lens facing the light emergent side is a concave surface; the second lens is provided with optical power, the surface of the second lens facing the light incident side is a convex surface, and the surface of the second lens facing the light emergent side is a concave surface; a third lens having optical power; the fourth lens is provided with negative focal power, and the surface of the fourth lens facing the light emergent side is a concave surface; the fifth lens is provided with positive focal power, the surface of the fifth lens facing the light incident side is a convex surface, and the surface of the fifth lens facing the light emergent side is a convex surface; the surface of the sixth lens facing the light incident side is a convex surface, and the surface of the sixth lens facing the light emergent side is a concave surface; half of the diagonal length of an effective pixel area on an imaging surface of the imaging lens is ImgH, and the entrance pupil diameter EPD of the imaging lens and the effective focal length f of the imaging lens satisfy: 2.7mm < imgh epd/f <5mm.

Further, the effective focal length f1 of the first lens and the effective focal length f5 of the fifth lens satisfy: 1.1< f1/f5<1.8.

Further, 0< f6/f4<1 is satisfied between the effective focal length f6 of the sixth lens and the effective focal length f4 of the fourth lens.

Further, the radius of curvature R1 of the surface of the first lens facing the light-in side, the radius of curvature R2 of the surface of the first lens facing the light-out side, the radius of curvature R3 of the surface of the second lens facing the light-in side, and the radius of curvature R4 of the surface of the second lens facing the light-out side satisfy: 0.8< (R1+R2)/(R3+R4) <1.3.

Further, the effective focal length f of the imaging lens, the radius of curvature R8 of the surface of the fourth lens toward the light-emitting side, the radius of curvature R9 of the surface of the fifth lens toward the light-entering side, and the radius of curvature R10 of the surface of the fifth lens toward the light-emitting side satisfy: 0.6< (R8+R9+R10)/f <2.0.

Further, the curvature radius R11 of the surface of the sixth lens facing the light entrance side and the curvature radius R12 of the surface of the sixth lens facing the light exit side satisfy: 2.0< (R11+R12)/(R11-R12) <2.8.

Further, the maximum field angle of the imaging lens satisfies FOV:70 ° < FOV <85 °.

Further, the effective half-aperture DT31 between half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging lens, the surface of the third lens facing the light incident side, and the effective half-aperture DT22 of the surface of the second lens facing the light emergent side satisfy: 1.4< imgh/(dt22+dt31) <1.8.

Further, the combined focal length f56 of the fifth lens and the sixth lens and the combined focal length f12 of the first lens and the second lens satisfy: 0.2< f12/f56<1.3.

Further, an on-axis distance TTL from a surface of the first lens facing the light incident side to an imaging surface of the imaging lens, an air interval T23 between the second lens and the third lens on the optical axis, and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 5.3< TTL/(T23+T56) <6.3.

Further, an on-axis distance SAG52 between an intersection of a surface of the fifth lens facing the light exit side and the optical axis and an effective radius vertex of a surface of the fifth lens facing the light exit side, an on-axis distance SAG42 between an intersection of a surface of the fourth lens facing the light exit side and the optical axis and an effective radius vertex of a surface of the fourth lens facing the light exit side, and an on-axis distance SAG41 between an intersection of a surface of the fourth lens facing the light entrance side and the optical axis and an effective radius vertex of a surface of the fourth lens facing the light entrance side satisfy: 0.7< SAG 52/(SAG41+SAG42) <1.6.

Further, an on-axis distance SAG62 between an intersection point of the surface of the sixth lens facing the light exit side and the optical axis to an effective radius vertex of the surface of the sixth lens facing the light exit side, and an on-axis distance SAG61 between an intersection point of the surface of the sixth lens facing the light entrance side and the optical axis to an effective radius vertex of the surface of the sixth lens facing the light entrance side satisfy: 0.7< SAG61/SAG62<1.2.

Further, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, and the center thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET 1+ ET2+ ET 3)/CT 1<1.3.

Further, the edge thickness ET6 of the sixth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< ET6/ET5<1.8.

According to another aspect of the present invention, there is provided an imaging lens including, from an incident light side to an exit light side: the first lens is provided with positive focal power, the surface of the first lens facing the light incident side is a convex surface, and the surface of the first lens facing the light emergent side is a concave surface; the second lens is provided with optical power, the surface of the second lens facing the light incident side is a convex surface, and the surface of the second lens facing the light emergent side is a concave surface; a third lens having optical power; the fourth lens is provided with negative focal power, and the surface of the fourth lens facing the light emergent side is a concave surface; the fifth lens is provided with positive focal power, the surface of the fifth lens facing the light incident side is a convex surface, and the surface of the fifth lens facing the light emergent side is a convex surface; the surface of the sixth lens facing the light incident side is a convex surface, and the surface of the sixth lens facing the light emergent side is a concave surface; the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens and the center thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET 1+ ET2+ ET 3)/CT 1<1.3.

By applying the technical scheme of the invention, the imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the light incident side to the light emergent side, wherein the first lens has positive focal power, the surface of the first lens facing the light incident side is a convex surface, and the surface of the first lens facing the light emergent side is a concave surface; the second lens has optical power, the surface of the second lens facing the light incident side is a convex surface, and the surface of the second lens facing the light emergent side is a concave surface; the third lens has optical power; the fourth lens has negative focal power, and the surface of the fourth lens facing the light emergent side is a concave surface; the fifth lens has positive focal power, the surface of the fifth lens facing the light incident side is a convex surface, and the surface of the fifth lens facing the light emergent side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light incident side is a convex surface, and the surface of the sixth lens facing the light emergent side is a concave surface; half of the diagonal length of an effective pixel area on an imaging surface of the imaging lens is ImgH, and the entrance pupil diameter EPD of the imaging lens and the effective focal length f of the imaging lens satisfy: 2.7mm < imgh epd/f <5mm.

The positive and negative distribution of the focal power of each lens of the imaging lens is reasonably controlled, so that the low-order aberration of the imaging lens can be effectively balanced, the sensitivity of the tolerance of the imaging lens can be reduced, the miniaturization of the imaging lens is kept, and the imaging quality of the imaging lens is ensured. By controlling ImgH EPD/f in a reasonable range, the imaging lens has the characteristics of large image plane and large aperture. The six-piece imaging lens has the advantages of being small in size, light in weight and thin in size, and good in imaging effect while guaranteeing miniaturization.

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 view showing the structure of an imaging lens according to an example one of the present application;

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 structural view showing an imaging lens of example two of the present application;

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 view 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 view 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 view showing the structure 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, a surface of a first lens facing a light incident side; s2, the surface of the first lens facing the light emitting side; e2, a second lens; s3, the surface of the second lens facing the light incident side; s4, the surface of the second lens facing the light emitting side; e3, a third lens; s5, the surface of the third lens facing the light incident side; s6, the surface of the third lens facing the light emitting side; e4, a fourth lens; s7, the surface of the fourth lens facing the light incident side; s8, the surface of the fourth lens facing the light emitting side; e5, a fifth lens; s9, the surface of the fifth lens facing the light incident side; s10, the surface of the fifth lens facing the light emitting side; e6, a sixth lens; s11, the surface of the sixth lens facing the light incident side; s12, the surface of the sixth lens facing the light emitting side; e7 filter plates; s13, the surface of the filter sheet facing the light incident side; s14, the surface of the filter sheet facing the light emitting side; 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 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). The surface facing the light incident side is determined to be convex when the R value is positive, and is determined to be concave when the R value is negative; the surface facing the light-emitting side is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

In order to solve the problem that the imaging lens in the prior art is incompatible with high image quality, the invention provides the imaging lens.

Example 1

As shown in fig. 1 to 30, the imaging lens includes, from a light incident side to a light emergent side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, the first lens has positive optical power, a surface of the first lens facing the light incident side is a convex surface, and a surface of the first lens facing the light emergent side is a concave surface; the second lens has optical power, the surface of the second lens facing the light incident side is a convex surface, and the surface of the second lens facing the light emergent side is a concave surface; the third lens has optical power; the fourth lens has negative focal power, and the surface of the fourth lens facing the light emergent side is a concave surface; the fifth lens has positive focal power, the surface of the fifth lens facing the light incident side is a convex surface, and the surface of the fifth lens facing the light emergent side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light incident side is a convex surface, and the surface of the sixth lens facing the light emergent side is a concave surface; half of the diagonal length of an effective pixel area on an imaging surface of the imaging lens is ImgH, and the entrance pupil diameter EPD of the imaging lens and the effective focal length f of the imaging lens satisfy: 2.7mm < imgh epd/f <5mm.

Preferably, the effective pixel area on the imaging surface of the imaging lens is half of the diagonal length ImgH, and the entrance pupil diameter EPD of the imaging lens and the effective focal length f of the imaging lens satisfy: 2.72mm < imgh epd/f <3.0mm.

The application provides a six-piece imaging lens with a large image surface, which meets FNO1.4, and has the characteristic of better ultrathin performance compared with seven pieces, and can obtain good imaging effect on the basis of ensuring miniaturization of the lens.

In the present embodiment, the effective focal length f1 of the first lens and the effective focal length f5 of the fifth lens satisfy: 1.1< f1/f5<1.8. The focal power of the first lens and the fifth lens is reasonably controlled to effectively reduce the optical sensitivity of the first lens and the fifth lens, so that the mass production requirements are more favorably realized, the yield of the first lens and the fifth lens is increased, and the imaging quality of the imaging lens can be effectively ensured. Preferably 1.3< f1/f5<1.7.

In the present embodiment, 0< f6/f4<1 is satisfied between the effective focal length f6 of the sixth lens and the effective focal length f4 of the fourth lens. By restricting the focal power ratio of the fourth lens to the sixth lens within a reasonable range, the spherical aberration contribution of the fourth lens and the sixth lens can be reasonably controlled within a reasonable level, so that the on-axis view field obtains good imaging quality. Preferably 0.1< f6/f4<0.9.

In the present embodiment, the radius of curvature R1 of the surface of the first lens facing the light-incident side, the radius of curvature R2 of the surface of the first lens facing the light-exit side, the radius of curvature R3 of the surface of the second lens facing the light-incident side, and the radius of curvature R4 of the surface of the second lens facing the light-exit side satisfy: 0.8< (R1+R2)/(R3+R4) <1.3. By controlling (R1+R2)/(R3+R4) within a reasonable range, the curvature radius of the surface of the first lens facing the light incident side, the curvature radius of the surface of the first lens facing the light emergent side, the curvature radius of the surface of the second lens facing the light incident side and the curvature radius of the surface of the second lens facing the light emergent side are limited within a certain relation range, so that the first lens and the second lens are adaptive and are mutually contained, the deflection angle of light between the first lens and the second lens can be reduced, stronger total reflection ghost images generated by overlarge deflection angle can be avoided, and the imaging quality of the imaging lens is ensured. Preferably, 0.9< (r1+r2)/(r3+r4) <1.1.

In the present embodiment, the effective focal length f of the imaging lens, the radius of curvature R8 of the surface of the fourth lens toward the light-emitting side, the radius of curvature R9 of the surface of the fifth lens toward the light-entering side, and the radius of curvature R10 of the surface of the fifth lens toward the light-emitting side satisfy: 0.6< (R8+R9+R10)/f <2.0. Through limiting (R8+R9+R10)/f in a reasonable range, mutual drag is generated between the total focal lengths of the fourth lens and the fifth lens and the imaging lens, so that the deflection angle of the marginal light of the imaging lens is reasonably controlled, the sensitivity of the imaging lens is effectively reduced, and the imaging performance of the imaging lens is ensured. Preferably 0.7< (r8+r9+r10)/f <1.95.

In the present embodiment, the curvature radius R11 of the surface of the sixth lens facing the light incident side and the curvature radius R12 of the surface of the sixth lens facing the light exiting side satisfy: 2.0< (R11+R12)/(R11-R12) <2.8. By controlling (R11+R12)/(R11-R12) within a reasonable range, the deflection angle of the edge view field in the sixth lens can be controlled, and the sensitivity of the imaging lens is reduced. Preferably, 2.2< (R11+R12)/(R11-R12) <2.75.

In the present embodiment, the maximum field angle of the imaging lens satisfies the FOV:70 ° < FOV <85 °. The FOV of the imaging lens is in the range of 70-85 degrees, so that the imaging lens has a larger imaging range, and the imaging lens can conveniently realize a large image plane. Preferably 78 ° < FOV <82 °.

In the present embodiment, the half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging lens, the effective half-caliber DT31 of the surface of the third lens facing the light-entering side, and the effective half-caliber DT22 of the surface of the second lens facing the light-exiting side satisfy: 1.4< imgh/(dt22+dt31) <1.8. Through limiting ImgH/(DT 22+ DT 31) within a reasonable range, the size of the imaging lens can be controlled, the deflection of light rays in the second lens and the third lens can be slowed down, the chip can better receive the light rays, and the illumination of an image plane is further improved. Preferably, 1.5< imgh/(dt22+dt31) <1.7.

In the present embodiment, the sum focal length f56 of the fifth lens and the sixth lens and the sum focal length f12 of the first lens and the second lens satisfy: 0.2< f12/f56<1.3. The f12/f56 is controlled in a reasonable range, so that the first lens, the second lens, the fifth lens and the sixth lens are mutually contained, the deflection angle of light rays is reduced, the deflection of an optical path is better realized by the imaging lens, and the imaging quality is improved. Preferably 0.3< f12/f56<1.2.

In the present embodiment, the on-axis distance TTL from the surface of the first lens facing the light incident side to the imaging surface of the imaging lens, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 5.3< TTL/(T23+T56) <6.3. The TTL/(T23+T56) is limited in a reasonable range, so that the field curvature contribution of each view field of the imaging lens is controlled in a reasonable range, the field curvature generated by other lenses is balanced, and the imaging quality of the imaging lens is ensured. Preferably, 5.5< TTL/(T23+T56) <6.2.

In the present embodiment, an on-axis distance SAG52 between the intersection of the surface of the fifth lens facing the light exit side and the optical axis and the effective radius vertex of the surface of the fifth lens facing the light exit side, an on-axis distance SAG42 between the intersection of the surface of the fourth lens facing the light exit side and the optical axis and the effective radius vertex of the surface of the fourth lens facing the light exit side, and an on-axis distance SAG41 between the intersection of the surface of the fourth lens facing the light entrance side and the optical axis and the effective radius vertex of the surface of the fourth lens facing the light entrance side satisfy: 0.7< SAG 52/(SAG41+SAG42) <1.6. By controlling SAG 52/(SAG41+SAG42) within a reasonable range, the shapes of the fourth lens and the fifth lens can be ensured, the processing of the fourth lens and the fifth lens is enabled to be at a better level, spherical aberration, coma aberration and astigmatism generated by the imaging lens can be effectively balanced, and the imaging quality of the imaging lens is effectively ensured. Preferably, 0.8< SAG 52/(SAG41+SAG42) <1.4.

In the present embodiment, an on-axis distance SAG62 between the intersection of the surface of the sixth lens facing the light exit side and the optical axis and the effective radius vertex of the surface of the sixth lens facing the light exit side, and an on-axis distance SAG61 between the intersection of the surface of the sixth lens facing the light entrance side and the optical axis and the effective radius vertex of the surface of the sixth lens facing the light entrance side satisfy: 0.7< SAG61/SAG62<1.2. The SAG61/SAG62 is controlled in a reasonable range, so that the angle of the principal ray of the imaging lens is adjusted, the relative brightness of the imaging lens can be effectively improved, and the definition of an image plane is improved. Preferably 0.8< SAG61/SAG62<1.1.

In the present embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, and the center thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET 1+ ET2+ ET 3)/CT 1<1.3. The (ET 1+ ET2+ ET 3)/CT 1 is limited in a reasonable range, so that the edge thicknesses of the first lens, the second lens and the third lens can be mutually limited, the field curvature contribution of each lens of the imaging lens is controlled in a reasonable range, the field curvature generated by other lenses is balanced, and the resolution of the imaging lens is improved. Preferably, 0.9< (ET 1+ ET2+ ET 3)/CT 1<1.2.

In the present embodiment, the edge thickness ET6 of the sixth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< ET6/ET5<1.8. Through controlling ET6/ET5 in reasonable within range for the mutual restriction between six lens and the edge thickness of fifth lens, can avoid these two lens edges too thin difficult shaping, can also alleviate the light deflection of lens edge department, avoid stronger ghost image, guarantee imaging lens's imaging quality. Preferably 1.1< ET6/ET5<1.7.

Example two

As shown in fig. 1 to 30, the imaging lens includes, from a light incident side to a light emergent side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, the first lens has positive optical power, a surface of the first lens facing the light incident side is a convex surface, and a surface of the first lens facing the light emergent side is a concave surface; the second lens has optical power, the surface of the second lens facing the light incident side is a convex surface, and the surface of the second lens facing the light emergent side is a concave surface; the third lens has optical power; the fourth lens has negative focal power, and the surface of the fourth lens facing the light emergent side is a concave surface; the fifth lens has positive focal power, the surface of the fifth lens facing the light incident side is a convex surface, and the surface of the fifth lens facing the light emergent side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light incident side is a convex surface, and the surface of the sixth lens facing the light emergent side is a concave surface; the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens and the center thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET 1+ ET2+ ET 3)/CT 1<1.3.

The positive and negative distribution of the focal power of each lens of the imaging lens is reasonably controlled, so that the low-order aberration of the imaging lens can be effectively balanced, the sensitivity of the tolerance of the imaging lens can be reduced, the miniaturization of the imaging lens is kept, and the imaging quality of the imaging lens is ensured. Through controlling ET6/ET5 in reasonable within range for the mutual restriction between six lens and the edge thickness of fifth lens, can avoid these two lens edges too thin difficult shaping, can also alleviate the light deflection of lens edge department, avoid stronger ghost image, guarantee imaging lens's imaging quality.

Preferably, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, and the center thickness CT1 of the first lens on the optical axis satisfy: 1.1< ET6/ET5<1.7.

The edge thickness ET6 of the sixth lens and the edge thickness ET5 of the fifth lens satisfy: 1.0< ET6/ET5<1.8. Through controlling ET6/ET5 in reasonable within range for the mutual restriction between six lens and the edge thickness of fifth lens, can avoid these two lens edges too thin difficult shaping, can also alleviate the light deflection of lens edge department, avoid stronger ghost image, guarantee imaging lens's imaging quality. Preferably 1.1< ET6/ET5<1.7.

Optionally, the imaging 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.

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 this specification without departing from the scope of the application as claimed. 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 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. Fig. 1 shows a schematic diagram of an imaging lens structure of example one.

As shown in fig. 1, the imaging lens sequentially includes, from an incident side to an emergent 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 E1 has positive power, a surface S1 of the first lens facing the light incident side is convex, and a surface S2 of the first lens facing the light exiting side is concave. The second lens E2 has negative focal power, a surface S3 of the second lens facing the light incident side is a convex surface, and a surface S4 of the second lens facing the light emergent side is a concave surface. The third lens E3 has positive power, a surface S5 of the third lens facing the light incident side is convex, and a surface S6 of the third lens facing the light exiting side is concave. The fourth lens E4 has negative power, a surface S7 of the fourth lens facing the light incident side is concave, and a surface S8 of the fourth lens facing the light exiting side is concave. The fifth lens E5 has positive power, a surface S9 of the fifth lens facing the light incident side is convex, and a surface S10 of the fifth lens facing the light exiting side is convex. The sixth lens E6 has negative power, a surface S11 of the sixth lens facing the light incident side is convex, and a surface S12 of the sixth lens facing the light exiting side is concave. The filter E7 has a surface S13 of the filter facing the light entrance side and a surface S14 of the filter facing the light exit side. 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 4.94mm, the total length TTL of the imaging lens is 6.09mm and the image height ImgH is 4.16mm.

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 surface of any one of the first lens E1 to the sixth lens E6 facing the light incident side and the surface facing the light exiting side are both aspherical, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical 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.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

2.6774E-03

-1.3927E-02

5.3993E-02

-1.3170E-01

2.1189E-01

-2.2331E-01

1.5063E-01

S2

-6.1609E-02

4.6999E-02

-1.1574E-01

6.3308E-01

-2.1363E+00

4.5255E+00

-6.4242E+00

S3

-9.4566E-02

3.7058E-02

1.0869E-01

-5.7323E-01

1.8558E+00

-4.0847E+00

6.2274E+00

S4

-4.9299E-02

9.5210E-03

4.2704E-01

-3.7709E+00

1.8771E+01

-5.9114E+01

1.2511E+02

S5

-2.8004E-02

-1.1726E-01

1.2072E+00

-7.3510E+00

2.8021E+01

-7.1730E+01

1.2802E+02

S6

-4.3974E-02

-9.1463E-02

9.8242E-01

-4.8943E+00

1.4607E+01

-2.9207E+01

4.0888E+01

S7

-1.8781E-01

2.6304E-01

4.3239E-02

-2.0530E+00

6.6993E+00

-1.2370E+01

1.5162E+01

S8

-3.9280E-01

8.4041E-01

-1.7028E+00

2.6809E+00

-3.1983E+00

2.8698E+00

-1.9414E+00

S9

-2.9655E-01

5.9424E-01

-1.1830E+00

1.9308E+00

-2.4627E+00

2.3871E+00

-1.7416E+00

S10

-1.4666E-01

3.0501E-01

-5.6355E-01

8.2180E-01

-8.7848E-01

6.7619E-01

-3.7613E-01

S11

-4.1302E-01

3.0696E-01

-1.6847E-01

6.2303E-02

-1.3736E-02

1.1286E-03

3.0253E-04

S12

-3.9083E-01

3.3153E-01

-2.3103E-01

1.2384E-01

-5.0275E-02

1.5347E-02

-3.5071E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-5.9687E-02

8.9869E-03

3.0533E-03

-1.8403E-03

3.6821E-04

-2.7622E-05

0.0000E+00

S2

6.3274E+00

-4.3852E+00

2.1328E+00

-7.1273E-01

1.5584E-01

-2.0072E-02

1.1545E-03

S3

-6.6891E+00

5.0990E+00

-2.7427E+00

1.0176E+00

-2.4780E-01

3.5649E-02

-2.2964E-03

S4

-1.8379E+02

1.8992E+02

-1.3764E+02

6.8498E+01

-2.2294E+01

4.2734E+00

-3.6573E-01

S5

-1.6241E+02

1.4729E+02

-9.4787E+01

4.2250E+01

-1.2398E+01

2.1539E+00

-1.6776E-01

S6

-4.0894E+01

2.9374E+01

-1.5027E+01

5.3393E+00

-1.2513E+00

1.7376E-01

-1.0820E-02

S7

-1.2991E+01

7.9247E+00

-3.4360E+00

1.0361E+00

-2.0671E-01

2.4529E-02

-1.3104E-03

S8

9.9222E-01

-3.8067E-01

1.0758E-01

-2.1630E-02

2.9135E-03

-2.3471E-04

8.5210E-06

S9

9.4876E-01

-3.8109E-01

1.1065E-01

-2.2490E-02

3.0263E-03

-2.4170E-04

8.6641E-06

S10

1.5158E-01

-4.4048E-02

9.1056E-03

-1.3029E-03

1.2249E-04

-6.8030E-06

1.6909E-07

S11

-1.2622E-04

2.3330E-05

-2.6902E-06

2.0403E-07

-9.9506E-09

2.8419E-10

-3.6233E-12

S12

5.9684E-04

-7.4941E-05

6.8254E-06

-4.3738E-07

1.8663E-08

-4.7538E-10

5.4628E-12

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the imaging lens of example one, which indicates the deviation of the converging focus 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 represents 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 imaging lens sequentially includes, from an incident side to an emergent 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 E1 has positive power, a surface S1 of the first lens facing the light incident side is convex, and a surface S2 of the first lens facing the light exiting side is concave. The second lens E2 has negative focal power, a surface S3 of the second lens facing the light incident side is a convex surface, and a surface S4 of the second lens facing the light emergent side is a concave surface. The third lens E3 has positive power, a surface S5 of the third lens facing the light incident side is convex, and a surface S6 of the third lens facing the light exiting side is concave. The fourth lens E4 has negative power, a surface S7 of the fourth lens facing the light incident side is convex, and a surface S8 of the fourth lens facing the light exiting side is concave. The fifth lens E5 has positive power, a surface S9 of the fifth lens facing the light incident side is convex, and a surface S10 of the fifth lens facing the light exiting side is convex. The sixth lens E6 has negative power, a surface S11 of the sixth lens facing the light incident side is convex, and a surface S12 of the sixth lens facing the light exiting side is concave. The filter E7 has a surface S13 of the filter facing the light entrance side and a surface S14 of the filter facing the light exit side. 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 4.94mm, the total length TTL of the imaging lens is 6.10mm and the image height ImgH is 4.18mm.

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

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

1.7842E-03

-1.5197E-02

9.6056E-02

-3.6426E-01

9.0707E-01

-1.5442E+00

1.8483E+00

S2

-6.0353E-02

3.2701E-02

-7.8197E-03

1.3578E-01

-7.0405E-01

1.7993E+00

-2.8556E+00

S3

-9.1364E-02

4.4274E-02

-1.2376E-02

9.0048E-02

-3.1921E-01

6.3938E-01

-8.7810E-01

S4

-4.4102E-02

2.0294E-02

2.3639E-01

-2.6141E+00

1.4602E+01

-4.9229E+01

1.0897E+02

S5

-1.3916E-02

-2.3880E-01

1.8635E+00

-9.5309E+00

3.2463E+01

-7.6699E+01

1.2888E+02

S6

-8.5883E-02

2.3093E-01

-8.4212E-01

2.0853E+00

-3.6928E+00

4.5486E+00

-3.7509E+00

S7

-2.1792E-01

5.3683E-01

-1.5652E+00

3.8748E+00

-7.7430E+00

1.1870E+01

-1.3613E+01

S8

-3.7420E-01

7.6721E-01

-1.5413E+00

2.4946E+00

-3.1375E+00

2.9962E+00

-2.1471E+00

S9

-2.9781E-01

5.7421E-01

-1.0681E+00

1.5583E+00

-1.6595E+00

1.2094E+00

-5.4764E-01

S10

-1.4371E-01

3.0430E-01

-5.8683E-01

8.9818E-01

-1.0042E+00

8.0611E-01

-4.6645E-01

S11

-4.0603E-01

2.9386E-01

-1.5638E-01

5.6593E-02

-1.2607E-02

1.3063E-03

1.2757E-04

S12

-3.8844E-01

3.2616E-01

-2.2467E-01

1.1826E-01

-4.6751E-02

1.3800E-02

-3.0340E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-1.5793E+00

9.6667E-01

-4.2016E-01

1.2648E-01

-2.5051E-02

2.9345E-03

-1.5396E-04

S2

3.0394E+00

-2.2340E+00

1.1388E+00

-3.9558E-01

8.9367E-02

-1.1838E-02

6.9765E-04

S3

8.7585E-01

-6.4205E-01

3.4212E-01

-1.2854E-01

3.2159E-02

-4.7907E-03

3.2045E-04

S4

-1.6526E+02

1.7487E+02

-1.2909E+02

6.5206E+01

-2.1486E+01

4.1617E+00

-3.5945E-01

S5

-1.5602E+02

1.3635E+02

-8.5167E+01

3.7049E+01

-1.0655E+01

1.8197E+00

-1.3967E-01

S6

1.8546E+00

-2.8612E-01

-2.7775E-01

2.1985E-01

-7.4407E-02

1.2878E-02

-9.2701E-04

S7

1.1523E+01

-7.1169E+00

3.1559E+00

-9.7674E-01

2.0019E-01

-2.4414E-02

1.3413E-03

S8

1.1444E+00

-4.4805E-01

1.2623E-01

-2.4747E-02

3.1880E-03

-2.4149E-04

8.1164E-06

S9

1.0101E-01

4.2201E-02

-3.6931E-02

1.2628E-02

-2.4030E-03

2.4942E-04

-1.1054E-05

S10

1.9500E-01

-5.8644E-02

1.2521E-02

-1.8479E-03

1.7903E-04

-1.0238E-05

2.6187E-07

S11

-7.3176E-05

1.3813E-05

-1.5712E-06

1.1653E-07

-5.5459E-09

1.5461E-10

-1.9263E-12

S12

4.9517E-04

-5.9518E-05

5.1839E-06

-3.1755E-07

1.2952E-08

-3.1538E-10

3.4657E-12

TABLE 4 Table 4

Fig. 7 shows an on-axis chromatic aberration curve of the imaging lens of example two, which indicates the deviation of the converging focus 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 represents 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 chromatic aberration of magnification 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 imaging lens sequentially includes, from an incident side to an emergent 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 E1 has positive power, a surface S1 of the first lens facing the light incident side is convex, and a surface S2 of the first lens facing the light exiting side is concave. The second lens E2 has negative focal power, a surface S3 of the second lens facing the light incident side is a convex surface, and a surface S4 of the second lens facing the light emergent side is a concave surface. The third lens E3 has positive power, a surface S5 of the third lens facing the light incident side is convex, and a surface S6 of the third lens facing the light exiting side is convex. The fourth lens E4 has negative power, a surface S7 of the fourth lens facing the light incident side is concave, and a surface S8 of the fourth lens facing the light exiting side is concave. The fifth lens E5 has positive power, a surface S9 of the fifth lens facing the light incident side is convex, and a surface S10 of the fifth lens facing the light exiting side is convex. The sixth lens E6 has negative power, a surface S11 of the sixth lens facing the light incident side is convex, and a surface S12 of the sixth lens facing the light exiting side is concave. The filter E7 has a surface S13 of the filter facing the light entrance side and a surface S14 of the filter facing the light exit side. 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 4.94mm, the total length TTL of the imaging lens is 6.07mm and the image height ImgH is 4.10mm.

Table 5 shows a basic structural parameter table of the imaging lens of example three, in which the units of radius of curvature, thickness/distance, and focal length 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.

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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 represents 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 the imaging lens of example three, 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. 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 imaging lens sequentially includes, from an incident side to an emergent 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 E1 has positive power, a surface S1 of the first lens facing the light incident side is convex, and a surface S2 of the first lens facing the light exiting side is concave. The second lens E2 has positive focal power, a surface S3 of the second lens facing the light incident side is a convex surface, and a surface S4 of the second lens facing the light emergent side is a concave surface. The third lens E3 has negative power, a surface S5 of the third lens facing the light incident side is concave, and a surface S6 of the third lens facing the light exiting side is convex. The fourth lens E4 has negative power, a surface S7 of the fourth lens facing the light incident side is convex, and a surface S8 of the fourth lens facing the light exiting side is concave. The fifth lens E5 has positive power, a surface S9 of the fifth lens facing the light incident side is convex, and a surface S10 of the fifth lens facing the light exiting side is convex. The sixth lens E6 has negative power, a surface S11 of the sixth lens facing the light incident side is convex, and a surface S12 of the sixth lens facing the light exiting side is concave. The filter E7 has a surface S13 of the filter facing the light entrance side and a surface S14 of the filter facing the light exit side. 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 4.94mm, the total length TTL of the imaging lens is 6.18mm and the image height ImgH is 4.22mm.

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 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.

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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 represents 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 the imaging lens of example four, 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. 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 imaging lens sequentially includes, from an incident side to an emergent 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 E1 has positive power, a surface S1 of the first lens facing the light incident side is convex, and a surface S2 of the first lens facing the light exiting side is concave. The second lens E2 has positive focal power, a surface S3 of the second lens facing the light incident side is a convex surface, and a surface S4 of the second lens facing the light emergent side is a concave surface. The third lens E3 has negative power, a surface S5 of the third lens facing the light incident side is concave, and a surface S6 of the third lens facing the light exiting side is concave. The fourth lens E4 has negative power, a surface S7 of the fourth lens facing the light incident side is convex, and a surface S8 of the fourth lens facing the light exiting side is concave. The fifth lens E5 has positive power, a surface S9 of the fifth lens facing the light incident side is convex, and a surface S10 of the fifth lens facing the light exiting side is convex. The sixth lens E6 has negative power, a surface S11 of the sixth lens facing the light incident side is convex, and a surface S12 of the sixth lens facing the light exiting side is concave. The filter E7 has a surface S13 of the filter facing the light entrance side and a surface S14 of the filter facing the light exit side. 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 4.91mm, the total length TTL of the imaging lens is 6.21mm and the image height ImgH is 4.15mm.

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 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 imaging lens of example five, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the imaging lens. Fig. 23 shows an astigmatism curve of the imaging lens of example five, which represents 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 imaging lens sequentially includes, from an incident side to an emergent 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 E1 has positive power, a surface S1 of the first lens facing the light incident side is convex, and a surface S2 of the first lens facing the light exiting side is concave. The second lens E2 has negative focal power, a surface S3 of the second lens facing the light incident side is a convex surface, and a surface S4 of the second lens facing the light emergent side is a concave surface. The third lens E3 has negative power, a surface S5 of the third lens facing the light incident side is concave, and a surface S6 of the third lens facing the light exiting side is concave. The fourth lens E4 has negative power, a surface S7 of the fourth lens facing the light incident side is convex, and a surface S8 of the fourth lens facing the light exiting side is concave. The fifth lens E5 has positive power, a surface S9 of the fifth lens facing the light incident side is convex, and a surface S10 of the fifth lens facing the light exiting side is convex. The sixth lens E6 has negative power, a surface S11 of the sixth lens facing the light incident side is convex, and a surface S12 of the sixth lens facing the light exiting side is concave. The filter E7 has a surface S13 of the filter facing the light entrance side and a surface S14 of the filter facing the light exit side. 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 4.93mm, the total length TTL of the imaging lens is 6.21mm and the image height ImgH is 4.17mm.

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).

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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.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-4.1010E-04

2.4043E-03

1.6000E-02

-1.2712E-01

4.3929E-01

-9.0485E-01

1.2219E+00

S2

-4.8596E-02

4.8004E-02

-1.6483E-01

6.9685E-01

-1.9725E+00

3.7391E+00

-4.8999E+00

S3

-6.5015E-02

6.2008E-02

-2.8488E-01

1.2734E+00

-3.6811E+00

7.2090E+00

-9.8842E+00

S4

-1.3842E-02

-1.1361E-01

1.1181E+00

-6.2265E+00

2.2689E+01

-5.6433E+01

9.8637E+01

S5

-3.5354E-03

-1.8281E-01

1.2789E+00

-6.4300E+00

2.1727E+01

-5.0864E+01

8.4408E+01

S6

-4.6344E-02

-2.3909E-01

1.5744E+00

-5.5384E+00

1.2487E+01

-1.9479E+01

2.1735E+01

S7

-1.4285E-01

1.2830E-02

5.3939E-01

-1.9964E+00

4.1356E+00

-5.7538E+00

5.6683E+00

S8

-1.5994E-01

1.3910E-01

-1.6339E-01

1.9830E-01

-2.3072E-01

2.3262E-01

-1.8764E-01

S9

-7.9163E-02

1.0934E-01

-2.9926E-01

5.9744E-01

-8.3281E-01

8.1916E-01

-5.7716E-01

S10

-8.2479E-02

1.5088E-01

-2.6134E-01

3.4950E-01

-3.4297E-01

2.4429E-01

-1.2615E-01

S11

-3.9043E-01

2.6329E-01

-1.5410E-01

7.9080E-02

-3.2693E-02

1.0194E-02

-2.3056E-03

S12

-3.8053E-01

3.0266E-01

-2.0190E-01

1.0490E-01

-4.1306E-02

1.2218E-02

-2.7081E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-1.1291E+00

7.2705E-01

-3.2620E-01

1.0001E-01

-1.9981E-02

2.3442E-03

-1.2252E-04

S2

4.5276E+00

-2.9709E+00

1.3757E+00

-4.3923E-01

9.1973E-02

-1.1363E-02

6.2754E-04

S3

9.6470E+00

-6.7310E+00

3.3298E+00

-1.1395E+00

2.5636E-01

-3.4085E-02

2.0284E-03

S4

-1.2312E+02

1.1020E+02

-7.0155E+01

3.0992E+01

-9.0278E+00

1.5589E+00

-1.2083E-01

S5

-1.0056E+02

8.6206E+01

-5.2661E+01

2.2349E+01

-6.2571E+00

1.0386E+00

-7.7366E-02

S6

-1.7611E+01

1.0389E+01

-4.4177E+00

1.3187E+00

-2.6202E-01

3.1100E-02

-1.6667E-03

S7

-4.0451E+00

2.1091E+00

-7.9920E-01

2.1499E-01

-3.8985E-02

4.2756E-03

-2.1419E-04

S8

1.1510E-01

-5.1840E-02

1.6648E-02

-3.6839E-03

5.3201E-04

-4.5082E-05

1.7002E-06

S9

2.9364E-01

-1.0781E-01

2.8243E-02

-5.1422E-03

6.1751E-04

-4.3936E-05

1.4018E-06

S10

4.7144E-02

-1.2668E-02

2.4138E-03

-3.1743E-04

2.7366E-05

-1.3912E-06

3.1614E-08

S11

3.7037E-04

-4.1443E-05

3.1238E-06

-1.4769E-07

3.6385E-09

-1.4219E-11

-8.6677E-13

S12

4.4845E-04

-5.5033E-05

4.9232E-06

-3.1147E-07

1.3188E-08

-3.3495E-10

3.8557E-12

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 represents 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 the imaging lens of example six, 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. 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*EPD/f(mm)	2.81	2.82	2.77	2.87	2.82	2.84
f1/f5	1.63	1.65	1.62	1.52	1.53	1.34
							f6/f4	0.82	0.73	0.82	0.22	0.21	0.18
(R1+R2)/(R3+R4)	1.08	1.06	1.06	0.94	0.96	1.03
							(R8+R9+R10)/f	0.88	0.86	0.85	1.88	1.74	1.74
(R11+R12)/(R11-R12)	2.48	2.43	2.69	2.29	2.32	2.34
							FOV(°)	79.20	79.29	78.11	79.38	78.91	78.92
ImgH/(DT22+DT31)	1.60	1.61	1.58	1.57	1.53	1.54
							f12/f56	1.12	1.11	1.08	0.42	0.43	0.43
TTL/(T23+T56)	6.09	5.81	5.89	5.69	5.66	5.65
							SAG52/(SAG41+SAG42)	0.94	0.97	0.92	1.34	1.34	1.32
SAG61/SAG62	0.98	0.93	0.92	1.08	1.08	1.03
							(ET1+ET2+ET3)/CT1	1.02	1.04	1.00	1.07	1.09	1.09
ET6/ET5	1.48	1.29	1.18	1.58	1.61	1.46

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

Example parameters	1	2	3	4	5	6
							f1(mm)	5.49	5.51	5.44	6.39	6.47	5.74
f2(mm)	-22.40	-25.26	-23.67	142.65	181.52	-43.16
							f3(mm)	25.48	48.82	25.04	-66.69	-69.17	-58.84
f4(mm)	-5.75	-6.33	-5.60	-19.21	-20.39	-24.62
							f5(mm)	3.37	3.34	3.36	4.21	4.24	4.30
f6(mm)	-4.69	-4.60	-4.59	-4.25	-4.28	-4.33
							f(mm)	4.94	4.94	4.94	4.94	4.91	4.93
TTL(mm)	6.09	6.10	6.07	6.18	6.21	6.21
							ImgH(mm)	4.16	4.18	4.10	4.22	4.15	4.17

TABLE 14

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 imaging lens described above.

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. The imaging lens is characterized by comprising six lenses, and the imaging lens comprises from a light inlet side to a light outlet side:

a first lens having positive optical power, a surface of the first lens facing the light incident side being a convex surface, and a surface of the first lens facing the light emergent side being a concave surface;

the second lens is provided with optical power, the surface of the second lens facing the light incident side is a convex surface, and the surface of the second lens facing the light emergent side is a concave surface;

A third lens having optical power;

a fourth lens having negative optical power, the surface of the fourth lens facing the light-emitting side being concave;

a fifth lens having positive optical power, a surface of the fifth lens facing the light incident side being a convex surface, and a surface of the fifth lens facing the light emergent side being a convex surface;

a sixth lens having negative optical power, a surface of the sixth lens facing the light incident side being a convex surface, and a surface of the sixth lens facing the light emergent side being a concave surface;

half of the diagonal length ImgH of an effective pixel area on an imaging surface of the imaging lens, the entrance pupil diameter EPD of the imaging lens and the effective focal length f of the imaging lens meet the following conditions: 2.7mm < imgh epd/f <5mm;

the curvature radius R1 of the surface of the first lens facing the light incident side, the curvature radius R2 of the surface of the first lens facing the light emergent side, the curvature radius R3 of the surface of the second lens facing the light incident side, and the curvature radius R4 of the surface of the second lens facing the light emergent side satisfy the following conditions: 0.8< (r1+r2)/(r3+r4) <1.3;

the effective focal length f of the imaging lens, the curvature radius R8 of the surface of the fourth lens facing the light emitting side, the curvature radius R9 of the surface of the fifth lens facing the light entering side, and the curvature radius R10 of the surface of the fifth lens facing the light emitting side satisfy: 0.6< (R8+R9+R10)/f <2.0;

The curvature radius R11 of the surface of the sixth lens facing the light incident side and the curvature radius R12 of the surface of the sixth lens facing the light emergent side satisfy: 2.0< (R11+R12)/(R11-R12) <2.8.

2. The imaging lens as claimed in claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f5 of the fifth lens satisfy: 1.1< f1/f5<1.8.

3. The imaging lens as claimed in claim 1, wherein 0< f6/f4<1 is satisfied between an effective focal length f6 of the sixth lens and an effective focal length f4 of the fourth lens.

4. The imaging lens of claim 1, wherein a maximum field angle of the imaging lens satisfies FOV:70 ° < FOV <85 °.

5. The imaging lens according to claim 1, wherein a half of a diagonal line length ImgH of an effective pixel region on an imaging surface of the imaging lens, an effective half-caliber DT31 of a surface of the third lens facing the light incident side, and an effective half-caliber DT22 of a surface of the second lens facing the light emergent side satisfy: 1.4< imgh/(dt22+dt31) <1.8.

6. The imaging lens as claimed in claim 1, wherein a combined focal length f56 of the fifth lens and the sixth lens and a combined focal length f12 of the first lens and the second lens satisfy: 0.2< f12/f56<1.3.

7. The imaging lens according to claim 1, wherein an on-axis distance TTL from a surface of the first lens facing the light-incident side to an imaging surface of the imaging lens, an air interval T23 on an optical axis of the second lens and the third lens, and an air interval T56 on the optical axis of the fifth lens and the sixth lens satisfy: 5.3< TTL/(T23+T56) <6.3.

8. The imaging lens according to claim 1, wherein an on-axis distance SAG52 between an intersection of a surface of the fifth lens facing the light exit side and an optical axis to an effective radius vertex of a surface of the fifth lens facing the light exit side, an on-axis distance SAG42 between an intersection of a surface of the fourth lens facing the light exit side and the optical axis to an effective radius vertex of a surface of the fourth lens facing the light exit side, and an on-axis distance SAG41 between an intersection of a surface of the fourth lens facing the light entrance side and the optical axis to an effective radius vertex of a surface of the fourth lens facing the light entrance side satisfy: 0.7< SAG 52/(SAG41+SAG42) <1.6.

9. The imaging lens according to claim 1, wherein an on-axis distance SAG62 between an intersection of a surface of the sixth lens facing the light exit side and an optical axis to an effective radius vertex of the surface of the sixth lens facing the light exit side, an on-axis distance SAG61 between an intersection of a surface of the sixth lens facing the light entrance side and the optical axis to an effective radius vertex of the surface of the sixth lens facing the light entrance side, satisfy: 0.7< SAG61/SAG62<1.2.

10. The imaging lens according to claim 1, wherein an edge thickness ET1 of the first lens, an edge thickness ET2 of the second lens, an edge thickness ET3 of the third lens, and a center thickness CT1 of the first lens on an optical axis satisfy: 0.8< (ET 1+ ET2+ ET 3)/CT 1<1.3.

11. The imaging lens of claim 1, wherein an edge thickness ET6 of the sixth lens and an edge thickness ET5 of the fifth lens satisfy: 1.0< ET6/ET5<1.8.

12. The imaging lens is characterized by comprising six lenses, and the imaging lens comprises from a light inlet side to a light outlet side:

a third lens having optical power;

wherein, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens and the center thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET 1+ ET2+ ET 3)/CT 1<1.3;

13. The imaging lens of claim 12, wherein an effective focal length f1 of the first lens and an effective focal length f5 of the fifth lens satisfy: 1.1< f1/f5<1.8.

14. The imaging lens of claim 12, wherein 0< f6/f4<1 is satisfied between an effective focal length f6 of the sixth lens and an effective focal length f4 of the fourth lens.

15. The imaging lens of claim 12 wherein a maximum field angle of the imaging lens satisfies the FOV:70 ° < FOV <85 °.

16. The imaging lens according to claim 12, wherein a half of a diagonal line length ImgH of an effective pixel region on an imaging surface of the imaging lens, an effective half-caliber DT31 of a surface of the third lens facing the light-incident side, and an effective half-caliber DT22 of a surface of the second lens facing the light-emergent side satisfy: 1.4< imgh/(dt22+dt31) <1.8.

17. The imaging lens of claim 12, wherein a combined focal length f56 of the fifth lens and the sixth lens and a combined focal length f12 of the first lens and the second lens satisfy: 0.2< f12/f56<1.3.

18. The imaging lens according to claim 12, wherein an on-axis distance TTL from a surface of the first lens facing the light-incident side to an imaging surface of the imaging lens, an air interval T23 on an optical axis of the second lens and the third lens, and an air interval T56 on the optical axis of the fifth lens and the sixth lens satisfy: 5.3< TTL/(T23+T56) <6.3.

19. The imaging lens according to claim 12, wherein an on-axis distance SAG52 between an intersection of a surface of the fifth lens facing the light exit side and an optical axis to an effective radius vertex of a surface of the fifth lens facing the light exit side, an on-axis distance SAG42 between an intersection of a surface of the fourth lens facing the light exit side and the optical axis to an effective radius vertex of a surface of the fourth lens facing the light exit side, and an on-axis distance SAG41 between an intersection of a surface of the fourth lens facing the light entrance side and the optical axis to an effective radius vertex of a surface of the fourth lens facing the light entrance side satisfy: 0.7< SAG 52/(SAG41+SAG42) <1.6.

20. The imaging lens according to claim 12, wherein an on-axis distance SAG62 between an intersection of a surface of the sixth lens facing the light exit side and an optical axis to an effective radius vertex of the surface of the sixth lens facing the light exit side, an on-axis distance SAG61 between an intersection of the surface of the sixth lens facing the light entrance side and the optical axis to an effective radius vertex of the surface of the sixth lens facing the light entrance side, satisfies: 0.7< SAG61/SAG62<1.2.

21. The imaging lens of claim 12, wherein an edge thickness ET6 of the sixth lens and an edge thickness ET5 of the fifth lens satisfy: 1.0< ET6/ET5<1.8.