CN114326047A

CN114326047A - Imaging lens

Info

Publication number: CN114326047A
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: 2022-04-12
Anticipated expiration: 2042-02-14
Also published as: CN114326047B

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 focal power, the surface of the second lens facing the light inlet side is a convex surface, and the surface of the second lens facing the light outlet side is a concave surface; the third lens has focal 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 inlet side is a convex surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light inlet side is a convex surface, and the surface of the sixth lens facing the light outlet side is a concave surface; the imaging surface of the imaging lens satisfies the following conditions that the half length ImgH of the diagonal line of the effective pixel area on the 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 are as follows: 2.7mm < ImgH EPD/f <5 mm. The invention solves the problem that the imaging lens in the prior art is not compatible with miniaturization and high image quality.

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 rapid development of intelligent products, the demand of each large electronic device manufacturer for a lens mounted on a mobile terminal is higher and higher, and especially the demand on the main camera of a high-end model is higher. 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 carrying of the lens, the imaging capability and the competitive advantage of the lens can be greatly improved, and meanwhile, higher difficulty challenge is provided for the design of the imaging lens.

That is to say, the imaging lens in the prior art has the problem of incompatibility of miniaturization and high image quality.

Disclosure of Invention

The invention mainly aims to provide an imaging lens to solve the problem that the imaging lens in the prior art is not compatible with miniaturization and high image quality.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens comprising, from a light-in side to a light-out side: the first lens has positive focal power, the surface of the first lens facing the light inlet side is a convex surface, and the surface of the first lens facing the light outlet side is a concave surface; the second lens has focal power, the surface of the second lens facing the light-in side is a convex surface, and the surface of the second lens facing the light-out side is a concave surface; a third lens having 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 inlet side is a convex surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light inlet side is a convex surface, and the surface of the sixth lens facing the light outlet side is a concave surface; the imaging surface of the imaging lens satisfies the following conditions that the half length ImgH of the diagonal line of the effective pixel area on the 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 are as follows: 2.7mm < ImgH EPD/f <5 mm.

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 curvature radius R1 of the surface of the first lens facing the light-in side, the curvature radius R2 of the surface of the first lens facing the light-out side, the curvature radius R3 of the surface of the second lens facing the light-in side and the curvature radius 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 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-emitting 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.

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

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

Further, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the imaging lens, the effective half aperture DT31 of the surface of the third lens facing the light-in side and the effective half aperture DT22 of the surface of the second lens facing the light-out 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 the following conditions: 0.2< f12/f56< 1.3.

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

Further, an on-axis distance SAG52 between an intersection point of a surface of the fifth lens facing the light exit side and the optical axis to an effective radius vertex of the surface of the fifth lens facing the light exit side, an on-axis distance SAG42 between an intersection point 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 point 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< SAG52/(SAG41+ SAG42) < 1.6.

Further, an on-axis distance SAG62 between an intersection point of a surface of the sixth lens facing the light exit side and the optical axis and 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 and 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 central thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET1+ ET2+ ET3)/CT1< 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, comprising from a light-in side to a light-out side: the first lens has positive focal power, the surface of the first lens facing the light inlet side is a convex surface, and the surface of the first lens facing the light outlet side is a concave surface; the second lens has focal power, the surface of the second lens facing the light-in side is a convex surface, and the surface of the second lens facing the light-out side is a concave surface; a third lens having 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 inlet side is a convex surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light inlet side is a convex surface, and the surface of the sixth lens facing the light outlet side is a concave surface; 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 central thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET1+ ET2+ ET3)/CT1< 1.3.

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

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-in side to the light-out side, wherein the first lens has positive focal power, the surface of the first lens facing the light-in side is a convex surface, and the surface of the first lens facing the light-out side is a concave surface; the second lens has focal power, the surface of the second lens facing the light inlet side is a convex surface, and the surface of the second lens facing the light outlet side is a concave surface; the third lens has focal 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 inlet side is a convex surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light inlet side is a convex surface, and the surface of the sixth lens facing the light outlet side is a concave surface; the imaging surface of the imaging lens satisfies the following conditions that the half length ImgH of the diagonal line of the effective pixel area on the 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 are as follows: 2.7mm < ImgH EPD/f <5 mm.

Through the distribution of positive and negative of the focal power of each lens of the imaging lens of reasonable control, can effectual balance imaging lens's low order aberration, can reduce imaging lens's tolerance's sensitivity simultaneously, guarantee imaging lens's imaging quality when keeping imaging lens's miniaturization. By controlling ImgH EPD/f within a reasonable range, the imaging lens has the characteristics of large image surface and large aperture. The size of the image plane and the aperture of the six-piece imaging lens is equivalent to that of a traditional seven-piece lens, and the six-piece imaging lens has the characteristics of miniaturization and lightness compared with the seven-piece lens, and has a good imaging effect while ensuring miniaturization.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a configuration of an imaging lens according to a first example of the present invention;

fig. 2 to 5 respectively 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;

fig. 6 is a schematic view showing a configuration of an imaging lens of a second example of the present invention;

fig. 7 to 10 respectively 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;

fig. 11 is a schematic structural view showing 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, respectively, of the imaging lens in fig. 11;

fig. 16 is a schematic view showing a configuration 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, respectively, of the imaging lens in fig. 16;

fig. 21 is a schematic view showing a 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, respectively, of the imaging lens in fig. 21;

fig. 26 is a schematic structural view showing 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 chromatic aberration of magnification curve, respectively, of the imaging lens in fig. 26.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the surface of the first lens facing the light incidence side; s2, the surface of the first lens facing the light-emitting side; e2, second lens; s3, the surface of the second lens facing the light incidence side; s4, the surface of the second lens facing the light-emitting side; e3, third lens; s5, the surface of the third lens facing the light incidence side; s6, the surface of the third lens facing the light-emitting side; e4, fourth lens; s7, the surface of the fourth lens facing the light incidence side; s8, the surface of the fourth lens facing the light-emitting side; e5, fifth lens; s9, the surface of the fifth lens facing the light incidence side; s10, the surface of the fifth lens facing the light-emitting side; e6, sixth lens; s11, the surface of the sixth lens facing the light incidence side; s12, the surface of the sixth lens facing the light-emitting side; e7 filter plate; s13, the surface of the filter plate facing to the light incident side; s14, the surface of the filter plate facing the light-emitting side; and S15, imaging surface.

Detailed Description

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

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

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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

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

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

The invention provides an imaging lens, aiming at solving the problem that the imaging lens in the prior art is not compatible with high image quality in miniaturization.

Example one

As shown in fig. 1 to 30, the imaging lens includes 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 exit side, the first lens has a positive focal 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 exit side is a concave surface; the second lens has focal power, the surface of the second lens facing the light inlet side is a convex surface, and the surface of the second lens facing the light outlet side is a concave surface; the third lens has focal 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 inlet side is a convex surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light inlet side is a convex surface, and the surface of the sixth lens facing the light outlet side is a concave surface; the imaging surface of the imaging lens satisfies the following conditions that the half length ImgH of the diagonal line of the effective pixel area on the 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 are as follows: 2.7mm < ImgH EPD/f <5 mm.

Preferably, the half length ImgH of the diagonal line of the effective pixel area on the 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 satisfy: 2.72mm < ImgH EPD/f <3.0 mm.

The six-piece imaging lens has the advantages that the six-piece imaging lens is large in image surface and meets the FNO1.4, compared with seven pieces, the ultra-thinning characteristic can be better realized, and a good imaging effect is obtained on the basis of ensuring the 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 optical power of the first lens and the optical power of the fifth lens are reasonably controlled to effectively reduce the optical sensitivity of the first lens and the optical sensitivity of the fifth lens, so that the mass production requirement is more favorably realized, the yield of the first lens and the yield of the fifth lens are 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 ratio of the focal power of the fourth lens and the focal power of the sixth lens within a reasonable range, the spherical aberration contributions of the fourth lens and the sixth lens can be reasonably controlled within a reasonable level, so that the on-axis field of view can obtain 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-entering side, the radius of curvature R2 of the surface of the first lens facing the light-exiting side, the radius of curvature R3 of the surface of the second lens facing the light-entering side, and the radius of curvature R4 of the surface of the second lens facing the light-exiting side satisfy: 0.8< (R1+ R2)/(R3+ R4) < 1.3. Through controlling (R1+ R2)/(R3+ R4) in reasonable scope, just make the curvature radius of the surface of first lens orientation income light side, the curvature radius of the surface of first lens orientation play light side, the curvature radius of the surface of second lens orientation income light side and the curvature radius of the surface of second lens orientation play light side limit in certain relation within range, make first lens and second lens be the adaptation and pin each other, and then can reduce the deflection angle of light between first lens and second lens, thereby avoid the too big strong total reflection ghost that produces of deflection angle, guarantee imaging lens's image quality. 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 facing the light-exit side, the radius of curvature R9 of the surface of the fifth lens facing the light-entrance side, and the radius of curvature R10 of the surface of the fifth lens facing the light-exit side satisfy: 0.6< (R8+ R9+ R10)/f < 2.0. By limiting (R8+ R9+ R10)/f in a reasonable range, the total focal lengths of the fourth lens, the fifth lens and the imaging lens are mutually restrained, so that the deflection angle of light rays at the edge 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, a curvature radius R11 of a surface of the sixth lens facing the light incident side and a curvature radius R12 of a 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 peripheral field of view at the sixth lens can be controlled, reducing the sensitivity of the imaging lens. Preferably, 2.2< (R11+ R12)/(R11-R12) < 2.75.

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

In the present embodiment, the effective half aperture DT31 of the diagonal length of the effective pixel region on the imaging surface of the imaging lens, the effective half aperture DT31 of 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 exit side satisfy: 1.4< ImgH/(DT22+ DT31) < 1.8. By limiting ImgH/(DT22+ DT31) within a reasonable range, the size of the imaging lens can be controlled, deflection of light rays at the second lens and the third lens can be relieved, the chip can better receive the light rays, and then the illumination of an image plane is improved. Preferably, 1.5< ImgH/(DT22+ DT31) < 1.7.

In the present embodiment, 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. By controlling f12/f56 within a reasonable range, the first lens, the second lens, the fifth lens and the sixth lens are mutually constrained to reduce the deflection angle of light rays, so that the imaging lens can better realize deflection of a light path and improve the imaging quality. Preferably 0.3< f12/f56< 1.2.

In the present embodiment, 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 the optical axis between the second lens and the third lens, and an air interval T56 on the optical axis between the fifth lens and the sixth lens satisfy: 5.3< TTL/(T23+ T56) < 6.3. By limiting TTL/(T23+ T56) within a reasonable range, the field curvature contribution amount of each field of the imaging lens is controlled within a reasonable range, the field curvature amount 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, the on-axis distance SAG52 between the intersection point of the surface of the fifth lens facing the light exit side and the optical axis to the effective radius vertex of the surface of the fifth lens facing the light exit side, the on-axis distance SAG42 between the intersection point of the surface of the fourth lens facing the light exit side and the optical axis to the effective radius vertex of the surface of the fourth lens facing the light exit side, and the on-axis distance SAG41 between the intersection point of the surface of the fourth lens facing the light entrance side and the optical axis to the effective radius vertex of the surface of the fourth lens facing the light entrance side satisfy: 0.7< SAG52/(SAG41+ SAG42) < 1.6. By controlling SAG52/(SAG41+ SAG42) within a reasonable range, the shapes of the fourth lens and the fifth lens can be ensured, the fourth lens and the fifth lens can be processed 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 can be effectively ensured. Preferably, 0.8< SAG52/(SAG41+ SAG42) < 1.4.

In the embodiment, the on-axis distance SAG62 from the intersection point of the surface of the sixth lens facing the light-emitting side and the optical axis to the effective radius vertex of the surface of the sixth lens facing the light-emitting side, and the on-axis distance SAG61 from the intersection point of the surface of the sixth lens facing the light-entering side and the optical axis to the effective radius vertex of the surface of the sixth lens facing the light-entering side satisfy: 0.7< SAG61/SAG62< 1.2. The SAG61/SAG62 is controlled within 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 central thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET1+ ET2+ ET3)/CT1< 1.3. By limiting (ET1+ ET2+ ET3)/CT1 within a reasonable range, the edge thicknesses of the first lens, the second lens and the third lens can be mutually constrained, so that the field curvature contribution amount of each lens of the imaging lens is controlled within a reasonable range, the field curvature amount generated by other lenses is balanced, and the image resolving power of the imaging lens is improved. Preferably, 0.9< (ET1+ ET2+ ET3)/CT1< 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 scope for pin down each other between the edge thickness of six lenses and fifth lens, can avoid these two lens edges too thin difficult shaping, can also alleviate the light deflection at lens edge, 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 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 exit side, the first lens has a positive focal 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 exit side is a concave surface; the second lens has focal power, the surface of the second lens facing the light inlet side is a convex surface, and the surface of the second lens facing the light outlet side is a concave surface; the third lens has focal 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 inlet side is a convex surface, and the surface of the fifth lens facing the light outlet side is a convex surface; the sixth lens has negative focal power, the surface of the sixth lens facing the light inlet side is a convex surface, and the surface of the sixth lens facing the light outlet side is a concave surface; 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 central thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET1+ ET2+ ET3)/CT1< 1.3.

Through the distribution of positive and negative of the focal power of each lens of the imaging lens of reasonable control, can effectual balance imaging lens's low order aberration, can reduce imaging lens's tolerance's sensitivity simultaneously, guarantee imaging lens's imaging quality when keeping imaging lens's miniaturization. Through controlling ET6/ET5 in reasonable scope for pin down each other between the edge thickness of six lenses and fifth lens, can avoid these two lens edges too thin difficult shaping, can also alleviate the light deflection at lens edge, 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 central 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 meet the following conditions: 1.0< ET6/ET5< 1.8. Through controlling ET6/ET5 in reasonable scope for pin down each other between the edge thickness of six lenses and fifth lens, can avoid these two lens edges too thin difficult shaping, can also alleviate the light deflection at lens edge, 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 on the imaging surface.

The imaging lens in the present application may employ a plurality of lenses, for example, the above-described six lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the machinability 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.

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

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

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

It should be noted that any one 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 of the 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 imaging lens sequentially includes, from the light incident side to the light emergent side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive power, and the surface S5 of the third lens facing the light-in side is convex, and the surface S6 of the third lens facing the light-out side is concave. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive optical power, and a surface S9 of the fifth lens facing the light-in side is convex, and a surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The 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 4.16 mm.

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

TABLE 1

In the first example, a surface facing the light incident side and a surface facing the light exiting side of any one of the first lens E1 to the sixth lens E6 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30, which can be used for each of the aspherical mirrors S1-S12 in example one.

Flour mark

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

Flour mark

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

As can be seen from fig. 2 to 5, the imaging lens according to the first example 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, descriptions of parts similar to 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 the light incident side to the light emitting side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive power, and the surface S5 of the third lens facing the light-in side is convex, and the surface S6 of the third lens facing the light-out side is concave. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is convex, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive optical power, and a surface S9 of the fifth lens facing the light-in side is convex, and a surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The 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 4.18 mm.

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

TABLE 3

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

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

Flour mark

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

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

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

Example III

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 the light incident side to the light emitting side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has positive optical power, and a surface S5 of the third lens facing the light-in side is convex, and a surface S6 of the third lens facing the light-out side is convex. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is concave, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive optical power, and a surface S9 of the fifth lens facing the light-in side is convex, and a surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The 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 4.10 mm.

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

TABLE 5

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

TABLE 6

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

As can be seen from fig. 12 to 15, the imaging lens according to the third example 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 the light incident side to the light emitting side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has positive refractive power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has negative power, and its surface S5 facing the light-in side is concave, and its surface S6 facing the light-out side is convex. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is convex, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive optical power, and a surface S9 of the fifth lens facing the light-in side is convex, and a surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The 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 4.22 mm.

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

TABLE 7

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

TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve of the imaging lens of example four, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 18 shows astigmatism curves of the imaging lens of example four, which represent meridional field curvature and sagittal field curvature. Fig. 19 shows distortion curves of the imaging lens of example four, which represent distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the imaging lens of example four, which represents a 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 according to 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 the light incident side to the light emitting side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has positive refractive power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has negative power, and the surface S5 of the third lens facing the light-in side is concave, and the surface S6 of the third lens facing the light-out side is concave. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is convex, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive optical power, and a surface S9 of the fifth lens facing the light-in side is convex, and a surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The 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 4.15 mm.

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

TABLE 9

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

Watch 10

Fig. 22 shows an on-axis chromatic aberration curve of the imaging lens of example five, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging lens. Fig. 23 shows astigmatism curves of the imaging lens of example five, which represent meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves of the imaging lens of example five, which represent distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the imaging lens of example five, which represents deviations 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 according to 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 the light incident side to the light exiting side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens E1 has positive power, and the surface S1 of the first lens facing the light-in side is convex, and the surface S2 of the first lens facing the light-out side is concave. The second lens E2 has negative power, and its surface S3 facing the light-in side is convex, and its surface S4 facing the light-out side is concave. The third lens E3 has negative power, and the surface S5 of the third lens facing the light-in side is concave, and the surface S6 of the third lens facing the light-out side is concave. The fourth lens E4 has negative power, and its surface S7 facing the light-in side is convex, and its surface S8 facing the light-out side is concave. The fifth lens E5 has positive optical power, and a surface S9 of the fifth lens facing the light-in side is convex, and a surface S10 of the fifth lens facing the light-out side is convex. The sixth lens E6 has negative power, and its surface S11 facing the light-entering side is convex, and its surface S12 facing the light-exiting side is concave. The filter E7 has a surface S13 facing the light entrance side of the filter and a surface S14 facing the light exit side of the filter. The 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 4.17 mm.

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

TABLE 11

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

Flour mark

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

Flour mark

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 on-axis chromatic aberration curves of the imaging lens of example six, which represent convergent focus deviations of light rays of different wavelengths after passing through the imaging lens. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example six. Fig. 29 shows distortion curves of the imaging lens of example six, which represent distortion magnitude values corresponding to different angles of view. Fig. 30 shows a chromatic aberration of magnification curve of the imaging lens of example six, which represents deviations 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 according to example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Conditional formula/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 effective focal lengths f of the imaging lenses of example one to example six, and 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 present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An imaging lens, comprising, from an entrance side to an exit side:

the first lens has positive focal power, the surface of the first lens facing the light inlet side is a convex surface, and the surface of the first lens facing the light outlet side is a concave surface;

the second lens has focal power, the surface of the second lens facing the light-in side is a convex surface, and the surface of the second lens facing the light-out side is a concave surface;

a third lens having an 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 surface of the fifth lens facing the light inlet side is a convex surface, and the surface of the fifth lens facing the light outlet side is a convex surface;

the sixth lens has negative focal power, the surface of the sixth lens facing the light-in side is a convex surface, and the surface of the sixth lens facing the light-out side is a concave surface;

wherein, half of the diagonal length ImgH of the effective pixel area on the 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 satisfy: 2.7mm < ImgH EPD/f <5 mm.

2. The imaging lens of 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 according to claim 1, characterized in that 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 according to claim 1, wherein a radius of curvature R1 of a surface of the first lens facing the light-entering side, a radius of curvature R2 of a surface of the first lens facing the light-exiting side, a radius of curvature R3 of a surface of the second lens facing the light-entering side, and a radius of curvature R4 of a surface of the second lens facing the light-exiting side satisfy: 0.8< (R1+ R2)/(R3+ R4) < 1.3.

5. The imaging lens of claim 1, wherein an effective focal length f of the imaging lens, a radius of curvature R8 of a surface of the fourth lens facing the light exit side, a radius of curvature R9 of a surface of the fifth lens facing the light entrance side, and a radius of curvature R10 of a surface of the fifth lens facing the light exit side satisfy: 0.6< (R8+ R9+ R10)/f < 2.0.

6. The imaging lens according to claim 1, wherein a radius of curvature R11 of a surface of the sixth lens facing the light incident side and a radius of curvature R12 of a surface of the sixth lens facing the light exit side satisfy: 2.0< (R11+ R12)/(R11-R12) < 2.8.

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

8. The imaging lens according to claim 1, wherein half ImgH of diagonal length of an effective pixel region on an imaging surface of the imaging lens, an effective half aperture DT31 of a surface of the third lens facing a light-in side, and an effective half aperture DT22 of a surface of the second lens facing a light-out side satisfy: 1.4< ImgH/(DT22+ DT31) < 1.8.

9. The imaging lens according to 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.

10. An imaging lens, comprising, from an entrance side to an exit side:

a third lens having an 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 central thickness CT1 of the first lens on the optical axis satisfy: 0.8< (ET1+ ET2+ ET3)/CT1< 1.3.