CN216210181U

CN216210181U - Camera lens

Info

Publication number: CN216210181U
Application number: CN202122383889.4U
Authority: CN
Inventors: 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: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-04-05
Anticipated expiration: 2031-09-29

Abstract

The utility model provides a camera lens. The imaging lens sequentially includes, from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the camera lens meets the following requirements between the half ImgH of the diagonal length of the effective pixel area on the imaging surface and the effective focal length f of the camera lens: f/(TTL/ImgH) is less than or equal to 4.5mm when the diameter is 2.5 mm; the Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: V/N < 12. The utility model solves the problem that the miniaturization and high image quality of the image pickup lens in the prior art are difficult to be considered at the same time.

Description

Camera lens

Technical Field

The utility model relates to the technical field of optical imaging equipment, in particular to a camera lens.

Background

Along with the popularization of mobile phones, the requirements of users on the mobile phones are higher and higher, the module technology is also continuously upgraded, the requirements on the imaging quality of the camera lens of the mobile phone are higher and higher, in this situation, the more lenses of the camera lens are made, the higher the price is, and for some manufacturers, the more the lens is required to be made into a large-image-height, large-aperture and ultrathin mobile phone lens, the higher cost performance is required. In recent years, the mobile phone is becoming thinner and thinner as a market trend, but the miniaturization and high image quality of the existing camera lens are difficult to be compatible.

That is, the imaging lens in the prior art has the problem that the miniaturization and the high image quality are difficult to be compatible.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an image pickup lens, which solves the problem that the miniaturization and high image quality of the image pickup lens in the prior art are difficult to be compatible.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens comprising, in order from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the camera lens meets the following requirements between the half ImgH of the diagonal length of the effective pixel area on the imaging surface and the effective focal length f of the camera lens: f/(TTL/ImgH) is less than or equal to 4.5mm when the diameter is 2.5 mm; the Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: V/N < 12.

Further, an on-axis distance TTL from the object-side surface of the first lens to the imaging surface, an entrance pupil diameter EPD of the imaging lens, and a maximum field angle FOV of the imaging lens satisfy: 2.0 ≦ EPD/(TTL/tan (FOV) < 9.5.

Further, the abbe number V1 of the first lens and the abbe number V2 of the second lens satisfy: 1.5< (V1+ V2)/(V1-V2) < 2.0.

Further, the abbe number V1 of the first lens, the abbe number V4 of the fourth lens and the abbe number V5 of the fifth lens satisfy: 55< (V1+ V4+ V5)/3< 60.

Further, the method can be used for preparing a novel materialThe effective focal length f4 of the fourth lens, the air interval T34 of the third lens and the fourth lens on the optical axis, and the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.2mm²≤f4*(T34-T45)<1.0mm²。

Further, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 1.2 is less than or equal to (T23+ T45)/T34 is less than or equal to 1.8.

Further, the effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: (f1+ f2)/f is less than or equal to-1.2 and is less than or equal to-3.0.

Further, the effective focal length f of the imaging lens, the center thickness CT1 of the first lens and the center thickness CT4 of the fourth lens satisfy: 2.9< f/(CT1+ CT4) < 3.4.

Further, an air interval T12 of the first lens and the second lens on the optical axis, an air interval T23 of the second lens and the third lens on the optical axis, and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 0< (T34-T23)/T12 is less than or equal to 1.8.

Further, the air interval T12 on the optical axis, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens of the first lens and the second lens satisfy: 2.5< (CT1+ T12)/CT2 is less than or equal to 4.0.

Further, an air interval T12 of the first lens and the second lens on the optical axis, a saggital height SAG12 of the image side surface of the first lens at the maximum effective radius satisfy: 0.2< SAG12/T12 is less than or equal to 0.5.

Further, the air space T34 of the third lens and the fourth lens on the optical axis, and the saggital height SAG41 of the object side surface of the fourth lens at the maximum effective radius satisfy-1.0 < SAG41/T34< -0.5.

Further, a sagittal height SAG41 of an object-side surface of the fourth lens at the maximum effective radius, a sagittal height SAG42 of an image-side surface of the fourth lens at the maximum effective radius, and a central thickness CT4 of the fourth lens satisfy: 1.4 is less than or equal to CT4/(SAG41-SAG42) < 3.0.

Further, a center thickness CT4 of the fourth lens and an edge thickness ET4 of the fourth lens at the maximum effective radius satisfy: CT4/ET4 is more than or equal to 1.5 and less than or equal to 3.5.

Further, the effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens satisfy: 0.5< f/f4< 1.5.

Further, the effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens satisfy: -2.0< f/f5< -0.5.

Further, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface of the imaging lens and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.5.

According to another aspect of the present invention, there is provided an imaging lens including, in order from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the entrance pupil diameter EPD of the camera lens and the maximum field angle FOV of the camera lens meet the following requirements: 2.0 ≦ EPD/(TTL/tan (FOV) < 9.5. The Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: V/N < 12.

Further, an effective focal length f4 of the fourth lens, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.2mm²≤f4*(T34-T45)<1.0mm2。

With the technical solution of the present invention, an imaging lens sequentially includes, from an object side to an image side along an optical axis: a first lens having positive optical power, a second lens having optical power, a third lens having optical power, a fourth lens having positive optical power, and a fifth lens having negative optical power; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the camera lens meets the following requirements between the half ImgH of the diagonal length of the effective pixel area on the imaging surface and the effective focal length f of the camera lens: f/(TTL/ImgH) is less than or equal to 4.5mm when the diameter is 2.5 mm; the Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: V/N < 12.

Through carrying out rational design to the focal power of each lens, make camera lens have high pixel, large aperture, the characteristics of easy processing when can guaranteeing camera lens performance, effectively increased camera lens's image quality. By limiting f/(TTL/ImgH) within a certain range, the camera lens is favorable for obtaining larger image height, and meanwhile, the camera lens is favorable for realizing ultra-thinning. By limiting the V/N within a reasonable range, when the V/N <12 meets the conditional expression, the lens is favorable for obtaining higher refractive index, so that the aberration of the optical system is better corrected, and the imaging performance under large aperture is improved.

Drawings

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

fig. 1 shows a schematic configuration diagram of an imaging lens according to a first example of the present invention;

fig. 2 to 4 respectively show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens in fig. 1;

fig. 5 shows a schematic configuration diagram of an imaging lens according to a second example of the present invention;

fig. 6 to 8 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens in fig. 5, respectively;

fig. 9 is a schematic diagram showing a configuration of an imaging lens according to example three of the present invention;

fig. 10 to 12 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens in fig. 9, respectively;

fig. 13 is a schematic view showing a configuration of an imaging lens according to example four of the present invention;

fig. 14 to 16 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens in fig. 13, respectively;

fig. 17 shows a schematic configuration diagram of an imaging lens according to example five of the present invention;

fig. 18 to 20 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens in fig. 17, respectively;

fig. 21 is a schematic diagram showing a configuration of an imaging lens according to example six of the present invention;

fig. 22 to 24 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens in fig. 21, respectively;

fig. 25 shows a schematic configuration diagram of an imaging lens according to a seventh example of the present invention;

fig. 26 to 28 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens in fig. 25, respectively.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; e6, a filter plate; s11, the object side surface of the filter plate; s12, the image side surface of the filter plate; and S13, 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 utility model.

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

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. 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. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The utility model provides an image pickup lens, aiming at solving the problem that the miniaturization and high image quality of the image pickup lens in the prior art are difficult to be considered.

In recent years, the ultra-thinning of mobile phones is a market trend, the module technology is continuously upgraded, and the requirement on the imaging quality of mobile phone lenses becomes higher and higher, under the situation, the number of mobile phone lens lenses is increased, the price is increased, and for some manufacturers, the five-piece optical imaging system with good imaging quality is required to be used for making large-image-height, large-aperture and ultra-thin mobile phone lenses along with the mainstream trend and also to seek higher cost performance. This application then is the best choice, and this application is 5 ultra-thin large aperture rearmounted camera lens and have great image plane, has super high performance price ratio, can provide great light ring, makes it even have fine imaging quality under dim environment, becomes the flat version of replacing of 6 pieces and 7 pieces of camera lenses.

Example one

As shown in fig. 1 to 28, the imaging lens includes, in order from an object side to an image side along an optical axis: a first lens having positive optical power, a second lens having optical power, a third lens having optical power, a fourth lens having positive optical power, and a fifth lens having negative optical power; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the camera lens meets the following requirements between the half ImgH of the diagonal length of the effective pixel area on the imaging surface and the effective focal length f of the camera lens: f/(TTL/ImgH) is less than or equal to 4.5mm when the diameter is 2.5 mm; the Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: V/N < 12.

Preferably, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface of the imaging lens, half ImgH of a diagonal length of an effective pixel area on the imaging surface, and an effective focal length f of the imaging lens satisfy: f/(TTL/ImgH) is less than or equal to 4.48mm when the diameter is 2.55 mm. The Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: 8< V/N < 11.

In this embodiment, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface, an entrance pupil diameter EPD of the imaging lens, and a maximum field angle FOV of the imaging lens satisfy: 2.0 ≦ EPD/(TTL/tan (FOV) < 9.5. By limiting the EPD/(TTL/tan (FOV)) within a reasonable range, the imaging quality of the imaging lens is ensured, and the imaging lens is beneficial to obtaining a larger homography aperture and a larger view field angle. Preferably, 2.01 ≦ EPD/(TTL/tan (FOV) < 9.1.

In the present embodiment, the abbe number V1 of the first lens and the abbe number V2 of the second lens satisfy: 1.5< (V1+ V2)/(V1-V2) < 2.0. By limiting (V1+ V2)/(V1-V2) to a reasonable range, the chromatic aberration of the imaging lens can be corrected to achieve better imaging quality of the imaging lens. Preferably, 1.6< (V1+ V2)/(V1-V2) < 1.95.

In the present embodiment, the abbe number V1 of the first lens, the abbe number V4 of the fourth lens, and the abbe number V5 of the fifth lens satisfy: 55< (V1+ V4+ V5)/3< 60. By limiting (V1+ V4+ V5)/3 within a reasonable range, the spherical aberration and the axial chromatic aberration of the camera lens can be corrected conveniently, and the imaging quality of the camera lens can be improved. Preferably, 55.1< (V1+ V4+ V5)/3< 52.

In the present embodiment, the effective focal length f4 of the fourth lens, the air interval T34 of the third lens and the fourth lens on the optical axis, and the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.2mm²≤f4*(T34-T45)<1.0mm². By limiting f4 (T34-T45) within a reasonable range, the correction of the on-axis spherical aberration is facilitated, and the imaging quality of the photographic lens is improved. Preferably, 0.2mm²≤f4*(T34-T45)<0.8mm²。

In the present embodiment, the air interval T23 of the second lens and the third lens on the optical axis, the air interval T34 of the third lens and the fourth lens on the optical axis, and the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 1.2 is less than or equal to (T23+ T45)/T34 is less than or equal to 1.8. By limiting the T34/(T23+ T45) within a reasonable range, the sensitivity of the interval of the camera lens to aberration can be effectively reduced, the assembly of the lens is facilitated, and the assembly yield is increased. Preferably, 1.22 ≦ (T23+ T45)/T34 ≦ 1.77.

In the present embodiment, the effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: (f1+ f2)/f is less than or equal to-1.2 and is less than or equal to-3.0. By limiting (f1+ f2)/f within a reasonable range, the curvature of field of the imaging lens can be controlled within a certain range, and the imaging quality of the imaging lens is ensured. Preferably, -2.98 ≦ (f1+ f2)/f ≦ -1.21.

In the present embodiment, the effective focal length f of the imaging lens, the center thickness CT1 of the first lens, and the center thickness CT4 of the fourth lens satisfy: 2.9< f/(CT1+ CT4) < 3.4. By limiting f/(CT1+ CT4) to a reasonable range, the center thickness of the lens can be reasonably arranged, and curvature of field of the imaging lens can be effectively corrected while the workability of the lens is ensured. Preferably, 2.95< f/(CT1+ CT4) < 3.3.

In the present embodiment, the air interval T12 of the first lens and the second lens on the optical axis, the air interval T23 of the second lens and the third lens on the optical axis, and the air interval T34 of the third lens and the fourth lens on the optical axis satisfy: 0< (T34-T23)/T12 is less than or equal to 1.8. By limiting (T34-T23)/T12 to a reasonable range, the compactness of the structure of the imaging lens is facilitated, and the miniaturization of the imaging lens is facilitated while the assembly between the lenses is ensured. Preferably, 0.2< (T34-T23)/T12 ≦ 1.8.

In the present embodiment, the air interval T12 on the optical axis, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens of the first lens and the second lens satisfy: 2.5< (CT1+ T12)/CT2 is less than or equal to 4.0. By limiting (CT1+ T12)/CT2 within a reasonable range, the compactness of the structure of the camera lens is facilitated, meanwhile, the sensitivity of the center thickness to field curvature is reduced, and the assembly yield of the lens is improved. Preferably, 2.6< (CT1+ T12)/CT2 ≦ 4.0.

In the present embodiment, the air interval T12 on the optical axis of the first lens and the second lens, the rise SAG12 of the image side surface of the first lens at the maximum effective radius satisfy: 0.2< SAG12/T12 is less than or equal to 0.5. By limiting SAG12/T12 within a reasonable range, smooth transition of the surface shape of the aspheric lens is facilitated, molding of the aspheric lens is facilitated, processability and manufacturability requirements are met, and simultaneously field curvature and peak sensitivity of the air space position between the first lens and the second lens are facilitated to be reduced. Preferably 0.21< SAG12/T12 ≦ 0.5.

In the present embodiment, the air interval T34 on the optical axis of the third lens and the fourth lens, and the rise SAG41 of the object side surface of the fourth lens at the maximum effective radius satisfy-1.0 < SAG41/T34< -0.5. By limiting SAG41/T34 within a reasonable range, the surface type of the aspheric lens is favorably smooth in transition and is favorably formed, so that the processability and manufacturability requirements are met. Preferably, -0.97< SAG41/T34< -0.51.

In the present embodiment, the SAGs 41 of the object-side surface of the fourth lens at the maximum effective radius, the SAGs 42 of the image-side surface of the fourth lens at the maximum effective radius, and the central thickness CT4 of the fourth lens satisfy: 1.4 is less than or equal to CT4/(SAG41-SAG42) < 3.0. By limiting the CT4/(SAG41-SAG42) within a reasonable range, the edge thickness of the lens can be controlled, and the lens can be formed conveniently, so that the requirements of processability and manufacturability are met. Preferably, 1.41 ≦ CT4/(SAG41-SAG42) < 2.9.

In the present embodiment, the central thickness CT4 of the fourth lens and the edge thickness ET4 of the fourth lens at the maximum effective radius satisfy: CT4/ET4 is more than or equal to 1.5 and less than or equal to 3.5. By controlling the ratio of the center thickness to the edge thickness of the fourth lens within a reasonable range, the processability and manufacturability requirements of the lens are favorably met. Preferably 1.52 ≦ CT4/ET4< 3.4.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens satisfy: 0.5< f/f4< 1.5. The ratio of the effective focal length of the camera lens to the effective focal length of the fourth lens is limited in a certain range, so that the field curvature of the camera lens can be reasonably controlled in a certain range, and the imaging quality of the camera lens is guaranteed. Preferably 0.55< f/f4< 1.47.

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens satisfy: -2.0< f/f5< -0.5. The ratio of the effective focal length of the camera lens to the effective focal length of the fifth lens is limited in a certain range, so that the field curvature of the camera lens can be reasonably controlled in a certain range, and the imaging quality of the camera lens is guaranteed. Preferably, -1.9< f/f5< -0.55.

In this embodiment, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface of the imaging lens and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.5. The miniaturization of the camera lens is facilitated by restricting the ratio of the total length of the camera lens to the half image surface within a certain range. Preferably, 1.0< TTL/ImgH < 1.47.

Example two

As shown in fig. 1 to 28, the imaging lens includes, in order from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the entrance pupil diameter EPD of the camera lens and the maximum field angle FOV of the camera lens meet the following requirements: 2.0 ≦ EPD/(TTL/tan (FOV) < 9.5; the Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: V/N < 12.

Through carrying out rational design to the focal power of each lens, make camera lens have high pixel, large aperture, the characteristics of easy processing when can guaranteeing camera lens performance, effectively increased camera lens's image quality. By limiting the EPD/(TTL/tan (FOV)) within a reasonable range, the imaging quality of the imaging lens is ensured, and the imaging lens is beneficial to obtaining a larger homography aperture and a larger view field angle. By limiting the V/N within a reasonable range, when the V/N <12 meets the conditional expression, the lens is favorable for obtaining higher refractive index, so that the aberration of the optical system is better corrected, and the imaging performance under large aperture is improved.

Preferably, an on-axis distance TTL from the object-side surface of the first lens to the imaging surface, an entrance pupil diameter EPD of the imaging lens, and a maximum field angle FOV of the imaging lens satisfy: 2.01 ≦ EPD/(TTL/tan (FOV) < 9.1. The Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: 8< V/N < 11.

In the present embodiment, the air interval T23 of the second lens and the third lens on the optical axis, the air interval T34 of the third lens and the fourth lens on the optical axis, and the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: T34/(T23+ T45) is more than or equal to 1.2 and less than or equal to 1.8. By limiting the T34/(T23+ T45) within a reasonable range, the sensitivity of the interval of the camera lens to aberration can be effectively reduced, the assembly of the lens is facilitated, and the assembly yield is increased. Preferably, 1.22. ltoreq. T34/(T23+ T45). ltoreq.1.77.

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

The imaging lens in the present application may employ a plurality of lenses, for example, five lenses described above. 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 camera lens can be effectively increased, the sensitivity of the camera lens can be reduced, and the machinability of the camera lens can be improved, so that the camera lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The imaging lens also has a large aperture and a large field angle. The advantages of ultra-thin and good imaging quality can meet the miniaturization requirement of intelligent electronic products.

In the present application, at least one of the 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 making up the imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the imaging lens is not limited to including five lenses. The camera lens may also include other numbers of lenses, as desired.

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

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

Example one

As shown in fig. 1 to 4, 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 includes, in order from an object side to an image 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 filter E6, and an image forming surface S13.

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

In this example, the total effective focal length f of the imaging lens is 4.18mm, and the maximum field angle FOV of the imaging lens is 82.3 °.

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

TABLE 1

In the first example, the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 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-S10 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.8960E-02

4.9851E-01

-4.9157E+00

3.1670E+01

-1.3934E+02

4.3209E+02

-9.6365E+02

S2

-6.6040E-02

9.3538E-02

-5.1082E-01

2.6360E+00

-8.8599E+00

1.9720E+01

-2.9542E+01

S3

-6.8895E-02

-1.1705E-01

2.5800E+00

-1.6567E+01

6.9341E+01

-1.9891E+02

3.9565E+02

S4

-6.4316E-02

8.8109E-01

-9.6966E+00

7.9154E+01

-4.3513E+02

1.6681E+03

-4.5537E+03

S5

-1.7190E-01

9.6208E-01

-1.1302E+01

8.4955E+01

-4.3410E+02

1.5523E+03

-3.9529E+03

S6

-1.3333E-01

5.4443E-01

-4.0038E+00

1.8474E+01

-5.8280E+01

1.2936E+02

-2.0545E+02

S7

-6.4983E-03

-2.4831E-01

8.8123E-01

-2.4838E+00

5.3120E+00

-8.9407E+00

1.1622E+01

S8

-3.0358E-03

-1.1066E-01

5.6746E-01

-1.5839E+00

2.8646E+00

-3.5523E+00

3.0674E+00

S9

-4.8478E-01

4.6056E-01

-1.9909E-01

-1.2243E-01

2.6709E-01

-2.1067E-01

1.0086E-01

S10

-5.5546E-01

6.5009E-01

-6.2487E-01

4.6028E-01

-2.5602E-01

1.0709E-01

-3.3610E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.5613E+03

-1.8380E+03

1.5549E+03

-9.2046E+02

3.6175E+02

-8.4757E+01

8.9571E+00

S2

2.9409E+01

-1.8627E+01

6.7886E+00

-1.0835E+00

0.0000E+00

S3

-5.4450E+02

5.0851E+02

-3.0749E+02

1.0858E+02

-1.7001E+01

0.0000E+00

S4

8.9099E+03

-1.2405E+04

1.1995E+04

-7.6570E+03

2.9006E+03

-4.9376E+02

0.0000E+00

S5

7.2027E+03

-9.3176E+03

8.3521E+03

-4.9310E+03

1.7244E+03

-2.7054E+02

0.0000E+00

S6

2.3459E+02

-1.9110E+02

1.0841E+02

-4.0699E+01

9.0926E+00

-9.1539E-01

0.0000E+00

S7

-1.1333E+01

8.0945E+00

-4.1307E+00

1.4557E+00

-3.3503E-01

4.5175E-02

-2.7014E-03

S8

-1.8526E+00

7.8348E-01

-2.3042E-01

4.6098E-02

-5.9728E-03

4.5095E-04

-1.5014E-05

S9

-3.2572E-02

7.3559E-03

-1.1688E-03

1.2845E-04

-9.3148E-06

4.0169E-07

-7.8110E-09

S10

7.8803E-03

-1.3679E-03

1.7283E-04

-1.5415E-05

9.1847E-07

-3.2776E-08

5.2947E-10

TABLE 2

Fig. 2 shows an axial chromatic aberration curve of the imaging lens of the first example, which shows the deviation of the convergent focal points of the light rays of different wavelengths after passing through the imaging lens. Fig. 3 shows astigmatism curves of the imaging lens of the first example, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the imaging lens of the first example, which show distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 2 to 4, the imaging lens according to the first example can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, 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. 5 shows a schematic diagram of the imaging lens structure of example two.

As shown in fig. 5, the imaging lens includes, in order from an object side to an image 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 element E1 has positive refractive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens E2 has negative power, and the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The third lens element E3 has positive refractive power, and the object-side surface S5 and the image-side surface S6 of the third lens element are convex. The fourth lens element E4 has positive refractive power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is convex and the image-side surface S10 of the fifth lens element is concave. Filter E6 has an object side S11 and an image side S12 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the imaging lens is 4.64mm, and the maximum field angle FOV of the imaging lens is 77.4 °.

Table 3 shows a basic structural parameter table of the imaging lens of example two, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius 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.

TABLE 4

Fig. 6 shows an axial chromatic aberration curve of the imaging lens of example two, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 7 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example two. Fig. 8 shows distortion curves of the imaging lens of example two, which show values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 6 to 8, the imaging lens according to example two can achieve good imaging quality.

Example III

As shown in fig. 9 to 12, an imaging lens of example three of the present application is described. Fig. 9 shows a schematic diagram of an imaging lens structure of example three.

As shown in fig. 9, the imaging lens includes, in order from an object side to an image 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 element E1 has positive refractive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens element E3 has negative power, and the object-side surface S5 of the third lens element is convex and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object-side surface S7 and the image-side surface S8 of the fourth lens element are convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is convex and the image-side surface S10 of the fifth lens element is concave. Filter E6 has an object side S11 and an image side S12 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the imaging lens is 4.81mm, and the maximum field angle FOV of the imaging lens is 81.3 °.

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.5225E-02

2.1137E-01

-1.5718E+00

7.4516E+00

-2.3830E+01

5.3379E+01

-8.5659E+01

S2

-6.7532E-03

1.1048E-02

-5.3469E-02

1.8242E-01

-4.0577E-01

6.0858E-01

-6.2730E-01

S3

-1.4645E-02

1.4528E-01

-9.7425E-01

4.7140E+00

-1.4999E+01

3.2397E+01

-4.8309E+01

S4

1.3340E-03

-1.7371E-02

6.5899E-01

-4.6516E+00

2.0393E+01

-5.9968E+01

1.2285E+02

S5

-5.8239E-02

-2.4334E-01

1.9641E+00

-1.0051E+01

3.5159E+01

-8.7482E+01

1.5825E+02

S6

-5.9581E-02

-1.7586E-02

1.3190E-01

-4.5592E-01

9.8802E-01

-1.4732E+00

1.5795E+00

S7

-1.5970E-02

-5.4076E-02

1.9814E-01

-4.1463E-01

5.5580E-01

-5.1816E-01

3.4868E-01

S8

-8.4347E-02

6.4457E-02

-3.2259E-02

1.2155E-02

-2.0693E-02

3.4856E-02

-3.2791E-02

S9

-2.7183E-01

1.3099E-01

-5.7514E-02

2.7802E-02

-1.4642E-02

6.9404E-03

-2.4819E-03

S10

-2.5509E-01

1.6228E-01

-9.0230E-02

3.9660E-02

-1.3263E-02

3.3274E-03

-6.2347E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

9.9573E+01

-8.3898E+01

5.0684E+01

-2.1378E+01

5.9736E+00

-9.9301E-01

7.4301E-02

S2

4.3918E-01

-2.0001E-01

5.3428E-02

-6.3464E-03

0.0000E+00

S3

4.9735E+01

-3.4696E+01

1.5652E+01

-4.1189E+00

4.8003E-01

0.0000E+00

S4

-1.7800E+02

1.8195E+02

-1.2844E+02

5.9591E+01

-1.6356E+01

2.0124E+00

0.0000E+00

S5

-2.1030E+02

2.0524E+02

-1.4536E+02

7.2650E+01

-2.4278E+01

4.8638E+00

-4.4124E-01

S6

-1.2500E+00

7.4139E-01

-3.2997E-01

1.0807E-01

-2.4700E-02

3.5137E-03

-2.3300E-04

S7

-1.7218E-01

6.2549E-02

-1.6533E-02

3.0921E-03

-3.8750E-04

2.9158E-05

-9.9450E-07

S8

1.9172E-02

-7.3988E-03

1.9237E-03

-3.3434E-04

3.7312E-05

-2.4220E-06

6.9617E-08

S9

6.2978E-04

-1.1217E-04

1.3940E-05

-1.1861E-06

6.5965E-08

-2.1639E-09

3.1788E-11

S10

8.6992E-05

-8.9780E-06

6.7546E-07

-3.6025E-08

1.2922E-09

-2.8015E-11

2.7807E-13

TABLE 6

Fig. 10 shows an on-axis chromatic aberration curve of the imaging lens of example three, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 11 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example three. Fig. 12 shows distortion curves of the imaging lens of example three, which show distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 10 to 12, the imaging lens according to the third example can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, an imaging lens of the present example four is described. Fig. 13 shows a schematic diagram of an imaging lens structure of example four.

As shown in fig. 13, the imaging lens includes, in order from an object side to an image 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 element E1 has positive refractive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has negative power, and the object-side surface S3 of the second lens element is convex and the image-side surface S4 of the second lens element is concave. The third lens E3 has negative power, and the object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is concave. The fourth lens element E4 has positive refractive power, and the object-side surface S7 and the image-side surface S8 of the fourth lens element are convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is convex and the image-side surface S10 of the fifth lens element is concave. Filter E6 has an object side S11 and an image side S12 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the imaging lens is 4.45mm, and the maximum field angle FOV of the imaging lens is 85.7 °.

Table 7 shows a basic structural parameter table of the imaging lens of example four, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius 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. 14 shows an on-axis chromatic aberration curve of the imaging lens of example four, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 15 shows astigmatism curves of the imaging lens of example four, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows distortion curves of the imaging lens of example four, which show distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 14 to 16, the imaging lens according to example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, an imaging lens of example five of the present application is described. Fig. 17 shows a schematic diagram of an imaging lens structure of example five.

As shown in fig. 17, the imaging lens includes, in order from an object side to an image 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.

In this example, the total effective focal length f of the imaging lens is 3.44mm, and the maximum field angle FOV of the imaging lens is 86.4 °.

Table 9 shows a basic structural parameter table of the imaging lens of example five, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.6111E-02

2.6983E+00

-6.1804E+01

8.4789E+02

-7.6144E+03

4.7166E+04

-2.0772E+05

S2

-7.0815E-02

-1.3179E+00

2.1810E+01

-2.1220E+02

1.3466E+03

-5.7367E+03

1.6523E+04

S3

-6.0705E-02

-2.1421E+00

4.6208E+01

-5.5573E+02

4.4538E+03

-2.4477E+04

9.3228E+04

S4

-3.3759E-02

-1.3697E+00

5.8139E+01

-1.1070E+03

1.3111E+04

-1.0326E+05

5.6006E+05

S5

-2.5831E-01

2.7048E+00

-4.7636E+01

5.3007E+02

-3.9441E+03

2.0334E+04

-7.4172E+04

S6

-1.2549E-01

-4.9570E-02

6.6866E-01

-4.2105E+00

1.2746E+01

-1.6245E+01

-1.8528E+01

S7

-4.7400E-02

-2.9593E-01

1.8121E+00

-7.7447E+00

2.3135E+01

-5.0163E+01

7.9323E+01

S8

-3.0314E-02

1.4322E-02

7.4349E-02

-2.1065E-02

-6.3485E-01

1.9494E+00

-3.1591E+00

S9

-5.0181E-01

4.6990E-01

-1.3425E-01

-3.1510E-01

5.3994E-01

-4.4408E-01

2.3228E-01

S10

-5.7938E-01

6.9410E-01

-6.9172E-01

5.3610E-01

-3.1715E-01

1.4213E-01

-4.8038E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.6009E+05

-1.5170E+06

2.4952E+06

-2.8609E+06

2.1693E+06

-9.7687E+05

1.9767E+05

S2

-3.1729E+04

3.8891E+04

-2.7503E+04

8.5324E+03

0.0000E+00

S3

-2.4527E+05

4.3656E+05

-5.0100E+05

3.3405E+05

-9.8177E+04

0.0000E+00

S4

-2.1236E+06

5.6200E+06

-1.0172E+07

1.1999E+07

-8.3113E+06

2.5638E+06

0.0000E+00

S5

1.9283E+05

-3.5508E+05

4.5246E+05

-3.7947E+05

1.8845E+05

-4.1983E+04

0.0000E+00

S6

1.1482E+02

-2.2171E+02

2.4133E+02

-1.5703E+02

5.7188E+01

-8.9980E+00

0.0000E+00

S7

-9.1289E+01

7.5961E+01

-4.5016E+01

1.8460E+01

-4.9650E+00

7.8649E-01

-5.5546E-02

S8

3.3119E+00

-2.3516E+00

1.1378E+00

-3.6934E-01

7.6983E-02

-9.3188E-03

4.9846E-04

S9

-8.3429E-02

2.1150E-02

-3.7935E-03

4.7224E-04

-3.8881E-05

1.9062E-06

-4.2168E-08

S10

1.2177E-02

-2.2928E-03

3.1506E-04

-3.0637E-05

1.9947E-06

-7.7932E-08

1.3808E-09

Watch 10

Fig. 18 shows an on-axis chromatic aberration curve of the imaging lens of example five, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 19 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example five. Fig. 20 shows distortion curves of the imaging lens of example five, which show distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 18 to 20, the imaging lens according to example five can achieve good imaging quality.

Example six

As shown in fig. 21 to 24, an imaging lens of example six of the present application is described. Fig. 21 shows a schematic diagram of an imaging lens structure of example six.

As shown in fig. 21, the imaging lens includes, in order from an object side to an image 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.

In this example, the total effective focal length f of the imaging lens is 6.22mm, and the maximum field angle FOV of the imaging lens is 80.8 °.

Table 11 shows a basic structural parameter table of the imaging lens of example six, in which the units of the curvature radius, the thickness/distance, the focal length, and the effective radius 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.

TABLE 12

Fig. 22 shows an on-axis chromatic aberration curve of the imaging lens of example six, which indicates that light rays of different wavelengths are out of focus after passing through the imaging lens. Fig. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example six. Fig. 24 shows distortion curves of the imaging lens of example six, which show distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 22 to 24, the imaging lens according to example six can achieve good imaging quality.

Example seven

As shown in fig. 25 to 28, an imaging lens of example seven of the present application is described. Fig. 25 shows a schematic diagram of an imaging lens structure of example seven.

As shown in fig. 25, the imaging lens includes, in order from an object side to an image 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 element E1 has positive refractive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens E2 has negative power, and the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The third lens element E3 has negative power, and the object-side surface S5 of the third lens element is concave, and the image-side surface S6 of the third lens element is convex. The fourth lens element E4 has positive refractive power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The fifth lens E5 has negative power, and the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is concave. Filter E6 has an object side S11 and an image side S12 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the imaging lens is 3.07mm, and the maximum field angle FOV of the imaging lens is 87.6 °.

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

Watch 13

Table 14 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example seven, wherein each of the aspherical mirror surface types can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.7913E-02

1.0302E+00

-1.1891E+01

8.6162E+01

-3.9101E+02

1.1215E+03

-1.9724E+03

1.9421E+03

-8.2207E+02

S2

2.7664E-02

1.9404E-01

-5.9271E+00

6.0354E+01

-3.6670E+02

1.3644E+03

-3.0381E+03

3.6775E+03

-1.8573E+03

S3

-5.0906E-02

1.5509E-02

2.2346E+00

-1.2763E+01

4.9957E+01

-1.3766E+02

2.5508E+02

-3.2295E+02

2.1411E+02

S4

6.9374E-02

-3.3490E-01

1.4066E+01

-1.5276E+02

1.0621E+03

-4.5920E+03

1.2001E+04

-1.7347E+04

1.0680E+04

S5

-3.4214E-01

8.6820E-01

-1.1403E+01

1.0061E+02

-5.6716E+02

2.0148E+03

-4.3709E+03

5.2954E+03

-2.7670E+03

S6

-2.5424E-01

4.2849E-01

-2.1480E+00

8.1503E+00

-2.0173E+01

3.2484E+01

-3.1775E+01

1.6816E+01

-3.6812E+00

S7

-9.3499E-02

5.8366E-02

-6.2326E-02

-6.9440E-03

4.5213E-02

-1.3748E-02

-6.7001E-03

4.0959E-03

-5.7484E-04

S8

-1.2518E-01

6.0207E-02

4.5420E-02

5.2597E-02

-1.3059E-01

8.6643E-02

-2.7576E-02

4.3934E-03

-2.8282E-04

S9

-2.8806E-01

1.7729E-01

1.0967E-01

-1.6308E-01

8.1991E-02

-2.2511E-02

3.5985E-03

-3.1593E-04

1.1826E-05

S10

-1.8752E-01

1.5228E-01

-8.8041E-02

3.4031E-02

-8.6630E-03

1.2626E-03

-6.4037E-05

-5.3181E-06

5.6294E-07

TABLE 14

Fig. 26 shows an on-axis chromatic aberration curve of the imaging lens of example seven, which shows the deviation of the convergent focal points of light rays of different wavelengths after passing through the imaging lens. Fig. 27 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example seven. Fig. 28 shows distortion curves of the imaging lens of example seven, which show distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 26 to 28, the imaging lens according to example seven can achieve good imaging quality.

In summary, the first to seventh embodiments satisfy the relationships shown in table 15, respectively.

Table 15 table 16 shows effective focal lengths f of the imaging lenses and effective focal lengths f1 to f5 of the respective lenses in the first to seventh embodiments.

Example parameters	1	2	3	4	5	6	7
								f1(mm)	3.59	3.82	4.56	4.39	3.17	5.96	2.60
f2(mm)	-9.48	-9.52	-14.44	-15.81	-7.78	-18.74	-11.64
								f3(mm)	39.96	36.65	-185.38	-36.11	20.78	-276.08	-21.15
f4(mm)	3.68	4.01	7.50	7.31	3.27	9.89	2.12
								f5(mm)	-2.68	-2.77	-5.24	-7.15	-2.39	-7.12	-1.64
f(mm)	4.18	4.64	4.81	4.45	3.44	6.22	3.07
								FOV(°)	82.3	77.4	81.3	85.7	86.4	80.8	87.6

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 above-described image pickup lens.

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 in order from an object side to an image side along an optical axis:

a first lens having a positive optical power;

a second lens having an optical power;

a third lens having optical power;

a fourth lens having a positive optical power;

a fifth lens having a negative optical power;

an on-axis distance TTL from the object-side surface of the first lens element to an imaging surface of the imaging lens is satisfied between half ImgH of a diagonal length of an effective pixel area on the imaging surface and an effective focal length f of the imaging lens: f/(TTL/ImgH) is less than or equal to 4.5mm when the diameter is 2.5 mm;

the Abbe number V of at least one lens in the first lens to the fifth lens and the refractive index N of the lens satisfy that: V/N < 12.

2. The imaging lens of claim 1, wherein an on-axis distance TTL from an object-side surface to an imaging surface of the first lens, an entrance pupil diameter EPD of the imaging lens, and a maximum field angle FOV of the imaging lens satisfy: 2.0 ≦ EPD/(TTL/tan (FOV) < 9.5.

3. The imaging lens according to claim 1, wherein an abbe number V1 of the first lens and an abbe number V2 of the second lens satisfy: 1.5< (V1+ V2)/(V1-V2) < 2.0.

4. The imaging lens according to claim 1, wherein abbe number V1 of the first lens, abbe number V4 of the fourth lens, and abbe number V5 of the fifth lens satisfy: 55< (V1+ V4+ V5)/3< 60.

5. The imaging lens according to claim 1, wherein an effective focal length f4 of the fourth lens, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.2mm²≤f4*(T34-T45)<1.0mm²。

6. The imaging lens according to claim 1, wherein an air interval T23 on the optical axis of the second lens and the third lens, an air interval T34 on the optical axis of the third lens and the fourth lens, and an air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: 1.2 is less than or equal to (T23+ T45)/T34 is less than or equal to 1.8.

7. The imaging lens of claim 1, wherein the effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: (f1+ f2)/f is less than or equal to-1.2 and is less than or equal to-3.0.

8. The imaging lens of claim 1, wherein an effective focal length f of the imaging lens, a center thickness CT1 of the first lens, and a center thickness CT4 of the fourth lens satisfy: 2.9< f/(CT1+ CT4) < 3.4.

9. The imaging lens according to claim 1, wherein an air interval T12 on the optical axis of the first lens and the second lens, an air interval T23 on the optical axis of the second lens and the third lens, and an air interval T34 on the optical axis of the third lens and the fourth lens satisfy: 0< (T34-T23)/T12 is less than or equal to 1.8.

10. The imaging lens according to claim 1, wherein an air interval T12 on the optical axis, a center thickness CT1 of the first lens, and a center thickness CT2 of the second lens of the first lens and the second lens satisfy: 2.5< (CT1+ T12)/CT2 is less than or equal to 4.0.

11. The imaging lens according to claim 1, wherein an air interval T12 on the optical axis of the first lens and the second lens, a saggital height SAG12 at a maximum effective radius of an image side surface of the first lens satisfy: 0.2< SAG12/T12 is less than or equal to 0.5.

12. The imaging lens of claim 1, wherein an air interval T34 on the optical axis of the third lens and the fourth lens, and a saggital height SAG41 of an object side surface of the fourth lens at a maximum effective radius satisfy-1.0 < SAG41/T34< -0.5.

13. The imaging lens of claim 1, wherein a center thickness CT4 of the fourth lens and an edge thickness ET4 of the fourth lens at a maximum effective radius satisfy: CT4/ET4 is more than or equal to 1.5 and less than or equal to 3.5.

14. The imaging lens according to claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f of the imaging lens satisfy: 0.5< f/f4< 1.5.

15. The imaging lens according to claim 1, wherein an effective focal length f5 of the fifth lens and an effective focal length f of the imaging lens satisfy: -2.0< f/f5< -0.5.

16. The imaging lens of claim 1, wherein an on-axis distance TTL from an object side surface of the first lens element to an imaging surface of the imaging lens and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.5.

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

a first lens having a positive optical power;

a second lens having an optical power;

a third lens having optical power;

a fourth lens having a positive optical power;

a fifth lens having a negative optical power;

the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the entrance pupil diameter EPD of the camera lens and the maximum field angle FOV of the camera lens meet the following conditions: 2.0 ≦ EPD/(TTL/tan (FOV) < 9.5;

18. The imaging lens according to claim 17, wherein an abbe number V1 of the first lens and an abbe number V2 of the second lens satisfy: 1.5< (V1+ V2)/(V1-V2) < 2.0.

19. The imaging lens according to claim 17, wherein abbe number V1 of the first lens, abbe number V4 of the fourth lens, and abbe number V5 of the fifth lens satisfy: 55< (V1+ V4+ V5)/3< 60.

20. The imaging lens according to claim 17, wherein an effective focal length f4 of the fourth lens, an air interval T34 of the third lens and the fourth lens on the optical axis, and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 0.2mm²≤f4*(T34-T45)<1.0mm2。

21. The imaging lens according to claim 17, wherein an air interval T23 on the optical axis of the second lens and the third lens, an air interval T34 on the optical axis of the third lens and the fourth lens, and an air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: 1.2 is less than or equal to (T23+ T45)/T34 is less than or equal to 1.8.

22. The imaging lens of claim 17, wherein the effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: (f1+ f2)/f is less than or equal to-1.2 and is less than or equal to-3.0.

23. The imaging lens of claim 17, wherein the effective focal length f of the imaging lens, the center thickness CT1 of the first lens, and the center thickness CT4 of the fourth lens satisfy: 2.9< f/(CT1+ CT4) < 3.4.

24. The imaging lens according to claim 17, wherein an air interval T12 on the optical axis of the first lens and the second lens, an air interval T23 on the optical axis of the second lens and the third lens, and an air interval T34 on the optical axis of the third lens and the fourth lens satisfy: 0< (T34-T23)/T12 is less than or equal to 1.8.

25. The imaging lens according to claim 17, wherein an air interval T12 on the optical axis, a center thickness CT1 of the first lens, and a center thickness CT2 of the second lens of the first lens and the second lens satisfy: 2.5< (CT1+ T12)/CT2 is less than or equal to 4.0.

26. The imaging lens of claim 17, wherein an air interval T12 on the optical axis of the first lens and the second lens, a saggital SAG12 at a maximum effective radius of an image side surface of the first lens, satisfies: 0.2< SAG12/T12 is less than or equal to 0.5.

27. The imaging lens of claim 17, wherein an air interval T34 on the optical axis of the third lens and the fourth lens, a saggital height SAG41 at a maximum effective radius of an object side surface of the fourth lens, satisfies-1.0 < SAG41/T34< -0.5.

28. The imaging lens of claim 17, wherein a center thickness CT4 of the fourth lens and an edge thickness ET4 of the fourth lens at a maximum effective radius satisfy: CT4/ET4 is more than or equal to 1.5 and less than or equal to 3.5.

29. An imaging lens according to claim 17, wherein an effective focal length f4 of the fourth lens is satisfied between: 0.5< f/f4< 1.5.

30. An imaging lens according to claim 17, wherein an effective focal length f5 of the imaging lens and an effective focal length f5 of the fifth lens satisfy: -2.0< f/f5< -0.5.

31. The imaging lens of claim 17, wherein an on-axis distance TTL from an object side surface of the first lens element to an imaging surface of the imaging lens and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.5.