CN113917657A

CN113917657A - Camera lens

Info

Publication number: CN113917657A
Application number: CN202111139053.8A
Authority: CN
Inventors: 戴付建; 翁宇翔; 徐武超; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-01-11

Abstract

The invention provides a camera lens. The imaging lens sequentially comprises at least five lenses with focal power from an object side to an image side along an optical axis, wherein the at least five lenses comprise: a first lens having a positive optical power; a second lens having a negative optical power; a negative lens near the image side surface of the at least five lenses, the negative lens having a negative focal power; a positive lens adjacent to the negative lens object side, the positive lens having a positive power; the infrared cut filter element is arranged on the object side of the imaging surface, and the object side surface of the infrared cut filter element is an aspheric surface; the maximum half field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half imgH of the diagonal length of the effective pixel area on the imaging surface meet the following conditions: TTL/(ImgH Tan (Semi-FOV)) < 1.65. The invention solves the problem that the small TTL and the high optical performance of the camera lens in the prior art are difficult to be considered simultaneously.

Description

Camera lens

Technical Field

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

Background

With the development of science and technology and the progress of society, smart devices gradually step into the lives of people, the types of the smart devices are various, the smart devices comprise smart phones, tablets, notebooks, cameras and the like, under the background that the smart phones continuously pursue large image plane and high pixels, the requirements of users on the lightness and thinness of the appearance of the mobile phones are higher and higher, and the requirements on camera lenses are gradually changed from large image planes to large image plane and small TTL. With the increase of the image plane of the camera lens, the TTL is reduced, and the performance parameters of the camera lens are reduced to a certain extent compared with those of the conventional camera lens with a large image plane, so that the image presenting effect of the camera lens is inevitably influenced.

That is to say, the imaging lens in the prior art has the problem that both small TTL and high optical performance are difficult to be compatible.

Disclosure of Invention

The invention mainly aims to provide a camera lens, which solves the problem that the camera lens in the prior art has small TTL and high optical performance and is difficult to simultaneously consider.

In order to achieve the above object, according to one 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, at least five lenses having optical powers, the at least five lenses including: a first lens having a positive optical power; a second lens having a negative optical power; a negative lens near the image side surface of the at least five lenses, the negative lens having a negative focal power; a positive lens adjacent to the negative lens object side, the positive lens having a positive power; the infrared cut filter element is arranged on the object side of the imaging surface, and the object side surface of the infrared cut filter element is an aspheric surface; the maximum half field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half imgH of the diagonal length of the effective pixel area on the imaging surface meet the following conditions: TTL/(ImgH Tan (Semi-FOV)) < 1.65.

Further, the maximum half field angle Semi-FOV of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy: 1.8mm < EPD star (Semi-FOV) <3.5 mm.

Further, the F number Fno of the camera lens, the on-axis distance TTL from the object-side surface of the first lens to the imaging surface, and the entrance pupil diameter EPD of the camera lens satisfy: fno (TTL/EPD) is not less than 4.0 and not more than 4.8.

Further, the F number Fno of the camera lens, the on-axis distance TTL from the object-side surface of the first lens element to the imaging surface, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: 1.4< Fno (ImgH/TTL) < 2.0.

Further, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface, a 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: (TTL/f) (TTL/ImgH) < 1.60.

Further, the effective focal length f of the imaging lens and the radius of curvature R of the object side surface of the infrared cut filter element_TPSatisfies the following conditions: 10 f/| R_TP|<1.0。

Further, an effective focal length f of the imaging lens and an effective focal length f of the infrared cut filter element_TPSatisfies the following conditions: 10 f/| f_TP|<0.5。

Further, the center thickness C of the infrared cut filter element_TPEdge thickness E at maximum effective radius of infrared cut filter element_TPSatisfies the following conditions: 0.9<C_TP/E_TP≤1.5。

Further, satisfy between camera lens's effective focal length f and the effective focal length fi of negative lens: -2< f/fi < -1.

Further, the effective focal length f of the camera lens, the effective focal length fo of the positive lens and the effective focal length fi of the negative lens satisfy: -1.0< f/fo + f/fi < 0.

Further, the effective focal length f of the camera lens and the curvature radius Ri of the object side surface of the negative lens satisfy: 1.0< f/Ri < 4.0.

Further, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 1.5< R4/R1< 4.5.

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: -3.7< f1/f + f2/f < -0.9.

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: -1.5< f1/f + f2/f < -0.9.

Furthermore, the material of the infrared cut filter element is glass, an infrared cut film is arranged on the object side surface or the image side surface of the infrared cut filter element, and the band-pass waveband of the infrared cut filter element is 430 nm-780 nm.

Further, the imaging lens includes, in order from the object side to the image side along the optical axis, five lenses having optical power, the five lenses including: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power.

Further, the center thickness CT1 of the first lens, the air space T23 on the optical axis between the second lens and the third lens satisfy 2.0< CT1/T23< 2.5.

Further, the center thickness CT3 of the third lens, the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy: 1.5< CT3/T45< 2.0.

Further, the imaging lens includes seven lenses having power in order from the object side to the image side along the optical axis, the seven lenses including: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having positive optical power; a seventh lens having a negative optical power.

Further, the maximum half field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: TTL/(ImgH Tan (Semi-FOV) < 1.5.

Further, the maximum half field angle Semi-FOV of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy: 2.5mm < EPD star (Semi-FOV) <3.5 mm.

Further, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 3.0< (R12+ R11)/(R12-R11) < 4.0.

Further, the center thickness CT6 of the sixth lens, the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: 1.0< CT6/T56< 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, at least five lenses having optical power, the at least five lenses including: a first lens having a positive optical power; a second lens having a negative optical power; a negative lens near the image side surface of the at least five lenses, the negative lens having a negative focal power; a positive lens adjacent to the negative lens object side, the positive lens having a positive power; the infrared cut filter element is arranged on the object side of the imaging surface, and the object side surface of the infrared cut filter element is an aspheric surface; the F number Fno of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the entrance pupil diameter EPD of the camera lens meet the following requirements: fno (TTL/EPD) is not less than 4.0 and not more than 4.8.

Further, the maximum half field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: TTL/(ImgH Tan (Semi-FOV)) < 1.65; the maximum half field angle Semi-FOV of the camera lens and the entrance pupil diameter EPD of the camera lens meet the following conditions: 1.8mm < EPD star (Semi-FOV) <3.5 mm.

By applying the technical scheme of the invention, the photographic lens sequentially comprises at least five lenses with focal power from an object side to an image side along an optical axis, the at least five lenses comprise a first lens with positive focal power, a second lens with negative focal power, a negative lens close to an image side surface in the at least five lenses, a positive lens adjacent to the object side of the negative lens and an infrared cut filter element, and the negative lens has negative focal power; the positive lens has positive focal power; the infrared cut filter element is arranged on the object side of the imaging surface, and the object side surface of the infrared cut filter element is an aspheric surface; the maximum half field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half imgH of the diagonal length of the effective pixel area on the imaging surface meet the following conditions: TTL/(ImgH Tan (Semi-FOV)) < 1.65.

Through the optical power of each lens of rational distribution, be favorable to balancing the aberration that camera lens produced, greatly increased camera lens's image quality. The object side surface of the infrared cut-off filter element is set to be an aspheric surface, and meanwhile, a relational expression between the maximum half field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half imgH of the diagonal length of the effective pixel area on the imaging surface is reasonably constrained, so that the infrared cut-off filter element and an optical system of the whole camera lens are synchronously optimized, the TTL is reduced while the performance is not obviously reduced under the condition that the size of the image surface is unchanged, the good optical performance of the camera lens is ensured, and the requirements of large image surface and small size are met. Meanwhile, the requirement of a large field angle is met, and the view finding range of shooting is widened.

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 according to a second example of the present invention;

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

fig. 11 is a schematic view showing a configuration of an imaging lens according to a third example 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 diagram showing a configuration of an imaging lens of example six of the present invention;

fig. 27 to 30 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens in fig. 26;

fig. 31 is a schematic view showing a configuration of an imaging lens of example seven of the present invention;

fig. 32 to 35 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the imaging lens in fig. 31, 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, the image side surface of the fifth lens.

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 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 invention provides a camera lens, aiming at solving the problem that the camera lens in the prior art has small TTL and high optical performance which are difficult to simultaneously consider.

Example one

As shown in fig. 1 to 35, the imaging lens includes, in order from an object side to an image side along an optical axis, at least five lenses having a negative power, the negative lens having a negative power, a positive lens adjacent to an object side of the negative lens, and an infrared cut filter element, the at least five lenses including a first lens having a positive power, a second lens having a negative power, and a negative lens near an image side surface of the at least five lenses; the positive lens has positive focal power; the infrared cut filter element is arranged on the object side of the imaging surface, and the object side surface of the infrared cut filter element is an aspheric surface; the maximum half field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half imgH of the diagonal length of the effective pixel area on the imaging surface meet the following conditions: TTL/(ImgH Tan (Semi-FOV)) < 1.65.

Preferably, 0.90< TTL/(ImgH · Tan (Semi-FOV)) < 1.65.

In the present embodiment, the maximum half field angle Semi-FOV of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy: 1.8mm < EPD star (Semi-FOV) <3.5 mm. Satisfy this conditional expression, can satisfy big light ring demand, big light ring is favorable to improving the clear aperture of system, holds more light and gets into the imaging surface, promotes whole picture luminance, improves the shooting effect under the dark night condition. Preferably, 1.8mm < EPD × Tan (Semi-FOV) <3.2 mm.

In this embodiment, the F-number Fno of the imaging lens, the on-axis distance TTL from the object-side surface of the first lens to the imaging surface, and the entrance pupil diameter EPD of the imaging lens satisfy: fno (TTL/EPD) is not less than 4.0 and not more than 4.8. The requirements of a large field angle and a large aperture are met, the large field angle is favorable for widening the viewing range of shooting, the large aperture is favorable for improving the clear aperture of an imaging system, more light rays are accommodated to enter an image plane, and the shooting effect under the dark night condition is favorable for improving.

In this embodiment, the F-number Fno of the imaging lens, the on-axis distance TTL from the object-side surface of the first lens element to the imaging surface, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: 1.4< Fno (ImgH/TTL) < 2.0. Satisfy this conditional expression, satisfy the demand of little TTL and large aperture, little TTL is favorable to realizing camera lens's miniaturization, promotes complete machine space utilization, reduces the protruding phenomenon of camera lens, guarantees that the complete machine is pleasing to the eye, and the large aperture is favorable to improving imaging system's clear aperture, holds more light and gets into image plane, is favorable to promoting the shooting effect under the dark night condition. Preferably, 1.4< Fno (ImgH/TTL) < 1.9.

In this embodiment, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: (TTL/f) (TTL/ImgH) < 1.60. The condition is satisfied, the ultrathin characteristic of the camera lens is guaranteed, miniaturization is realized, the space utilization rate of the whole machine is improved, the protruding phenomenon of the camera lens is reduced, and the attractiveness of the whole machine is guaranteed. Preferably, 1.20< (TTL/f) > (TTL/ImgH) < 1.60.

In the present embodiment, the effective focal length f of the imaging lens and the radius of curvature R of the object side surface of the infrared cut filter element_TPSatisfies the following conditions: 10 f/| R_TP|<1.0. Satisfying the conditional expression, the infrared cut-off filter element can be improvedThe surface type of the object side surface of the lens reduces the sensitivity of the system to the third lens and ensures the processing feasibility. Preferably, 10 f/| R_TP|<0.7。

In the present embodiment, the effective focal length f of the imaging lens and the effective focal length f of the infrared cut filter element_TPSatisfies the following conditions: 10 f/| f_TP|<0.5. The condition is satisfied, the field curvature of the system can be effectively controlled while the TTL of the camera lens is reduced, and the imaging quality is ensured. Preferably, 10 f/| f_TP|<0.4。

In the present embodiment, the center thickness C of the infrared cut filter element_TPEdge thickness E at maximum effective radius of infrared cut filter element_TPSatisfies the following conditions: 0.9<C_TP/E_TPLess than or equal to 1.5. The condition formula is satisfied, and the requirement of the infrared cut filter element on the processability is favorably satisfied.

In this embodiment, the effective focal length f of the imaging lens and the effective focal length fi of the negative lens satisfy: -2< f/fi < -1. The condition is satisfied, the optical powers of the first lens to the seventh lens are reasonably distributed in space, and the aberration of the camera lens is reduced. Preferably, -1.7< f/fi < -1.1.

In this embodiment, the effective focal length f of the imaging lens, the effective focal length fo of the positive lens, and the effective focal length fi of the negative lens satisfy: -1.0< f/fo + f/fi < 0. The condition is satisfied, the optical powers of the first lens to the seventh lens are reasonably distributed in space, and the aberration of the camera lens is reduced. Preferably, -0.7< f/fo + f/fi < -0.1.

In the present embodiment, the effective focal length f of the imaging lens and the radius of curvature Ri of the object side surface of the negative lens satisfy: 1.0< f/Ri < 4.0. The condition is satisfied, the shape of the object side surface of the negative lens is favorably controlled, and the requirement of processability is satisfied. Preferably, 1.1< f/Ri < 3.6.

In the present embodiment, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 1.5< R4/R1< 4.5. The condition is satisfied, the shape of the first lens and the shape of the second lens are controlled, and the processing requirement is satisfied. Preferably, 1.7< R4/R1< 4.2.

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: -3.7< f1/f + f2/f < -0.9. The condition is satisfied, the optical power of the first lens and the second lens is reasonably distributed in space, and the aberration of the camera lens is reduced. Preferably, -3.7< f1/f + f2/f < -1.0.

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: -1.5< f1/f + f2/f < -0.9. The condition is satisfied, the optical power of the first lens and the second lens is reasonably distributed in space, and the aberration of the camera lens is reduced.

In this embodiment, the infrared cut filter element is made of glass, an infrared cut film is disposed on an object side surface or an image side surface of the infrared cut filter element, and a band pass band of the infrared cut filter element is 430nm to 780 nm. An infrared cut-off film is arranged on the object side surface or the image side surface of the infrared cut-off filter element, so that the received light is ensured to be in a visible light waveband.

In this embodiment, the imaging lens includes five lenses having a positive power, a second lens having a negative power, a third lens having a positive power, a fourth lens having a positive power, and a fifth lens having a negative power in order from the object side to the image side along the optical axis. Through the reasonable distribution of the focal power of each lens, the spatial reasonable distribution of the focal power of the first lens to the fifth lens is facilitated, and the aberration of the camera lens is reduced.

In the present embodiment, 2.0< CT1/T23<2.5 is satisfied among the central thickness CT1 of the first lens, the air interval T23 on the optical axis of the second lens and the third lens. The condition is satisfied, the system processability can be ensured, and the production cost is reduced. Preferably, 1.9< CT1/T23< 3.5.

In the present embodiment, the center thickness CT3 of the third lens, the air interval T45 on the optical axis between the fourth lens and the fifth lens satisfy: 1.5< CT3/T45< 2.0. The condition is satisfied, the system processability can be ensured, and the production cost is reduced. Preferably 0.6< CT3/T45< 1.7.

In this embodiment, the imaging lens includes seven lenses having optical power in order from the object side to the image side along the optical axis, and the seven lenses include a first lens having positive optical power, a second lens having negative optical power, a third lens having optical power, a fourth lens having optical power, a fifth lens having optical power, a sixth lens having positive optical power, and a seventh lens having negative optical power. Through the reasonable distribution of the focal power of each lens, the spatial reasonable distribution of the focal power of the first lens to the seventh lens is facilitated, and the aberration of the lens is reduced.

In the present embodiment, the maximum half field angle Semi-FOV of the imaging lens, the on-axis distance TTL from the object-side surface of the first lens to the imaging surface, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: TTL/(imgH Tan (Semi-FOV) < 1.5. the condition formula is satisfied, the requirements of small TTL and large field angle are satisfied, the small TTL is beneficial to realizing the miniaturization of the camera lens, the space utilization rate of the whole machine is improved, the bulge phenomenon of the camera lens is reduced, the attractiveness of the whole machine is ensured, and the large aperture is beneficial to widening the view range of shooting.

In the present embodiment, the maximum half field angle Semi-FOV of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy: 2.5mm < EPD star (Semi-FOV) <3.5 mm. Satisfy this conditional expression, satisfy big light ring demand, big light ring is favorable to improving imaging system's clear aperture, holds more light and gets into image plane, promotes whole picture luminance, improves the shooting effect under the dark night condition.

In the present embodiment, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 3.0< (R12+ R11)/(R12-R11) < 4.0. The conditional expression is satisfied, the shape of the sixth lens is favorably controlled, and the requirement of processability is satisfied.

In the present embodiment, the center thickness CT6 of the sixth lens, the air interval T56 on the optical axis between the fifth lens and the sixth lens satisfy: 1.0< CT6/T56< 1.5. The condition is satisfied, the system processability can be ensured, and the production cost is reduced.

Example two

As shown in fig. 1 to 35, the imaging lens includes, in order from an object side to an image side along an optical axis, at least five lenses having a negative power, the negative lens having a negative power, a positive lens adjacent to an object side of the negative lens, and an infrared cut filter element, the at least five lenses including a first lens having a positive power, a second lens having a negative power, and a negative lens near an image side surface of the at least five lenses; the positive lens has positive focal power; the infrared cut filter element is arranged on the object side of the imaging surface, and the object side surface of the infrared cut filter element is an aspheric surface; the F number Fno of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the entrance pupil diameter EPD of the camera lens meet the following requirements: fno (TTL/EPD) is not less than 4.0 and not more than 4.8.

Through the optical power of each lens of rational distribution, be favorable to balancing the aberration that camera lens produced, greatly increased camera lens's image quality. The object side surface of the infrared cut filter element is set to be an aspheric surface, so that the infrared cut filter element and an optical system of the whole camera lens are synchronously optimized, the TTL is reduced under the condition of ensuring that the image plane size is unchanged, the performance is ensured not to be obviously reduced, the good optical performance of the camera lens is ensured, and the requirements of large image plane and small size are met. Meanwhile, the requirement of a large field angle is met, and the view finding range of shooting is widened. The large field angle and the large aperture requirement are met through the relational expression between the F number Fno of the constraint camera lens, the axial distance TTL from the object side surface of the first lens to the imaging surface and the entrance pupil diameter EPD of the camera lens, the large field angle is favorable for widening the viewing range of shooting, the large aperture is favorable for improving the clear aperture of the imaging system, more light rays are accommodated to enter the image surface, and the shooting effect under the dark night condition is favorable for improving.

In the present embodiment, the maximum half field angle Semi-FOV of the imaging lens, the on-axis distance TTL from the object-side surface of the first lens to the imaging surface, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: TTL/(ImgH Tan (Semi-FOV)) < 1.65. The condition is satisfied, TTL is reduced, the performance is not obviously reduced, the good optical performance of the camera lens is ensured, and the requirements of large image surface and small size are satisfied. Meanwhile, the requirement of a large field angle is met, and the view finding range of shooting is widened. Preferably, 0.90< TTL/(ImgH · Tan (Semi-FOV)) < 1.65.

In the present embodiment, the effective focal length f of the imaging lens and the radius of curvature R of the object side surface of the infrared cut filter element_TPSatisfies the following conditions: 10 f/| R_TP|<1.0. The surface shape of the object side surface of the infrared cut filter element can be improved and the sensitivity of the system to the third lens can be reduced by satisfying the conditional expressionAnd 4, ensuring the processing feasibility. Preferably, 10 f/| R_TP|<0.7。

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

The imaging lens in the present application may employ a plurality of lenses, for example, at least 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 at least five lenses are exemplified in the embodiments, the imaging lens is not limited to including at least five lenses. The camera 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 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 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 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 seventh lens E7, an infrared cut filter element E8, and an image forming surface S17.

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 of the fourth lens element is convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive 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. The sixth lens element E6 has positive refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. The infrared cut filter E8 has an object side surface S15 of the infrared cut filter and an image side surface S16 of the infrared cut filter, and the object side surface S15 of the infrared cut filter is convex. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length F of the imaging lens is 6.49mm, the F-number Fno of the imaging lens is 1.98 and the image height ImgH is 6.25 mm.

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 seventh lens element E7 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-S15 in example one.

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. Fig. 5 shows a chromatic aberration of magnification curve of the imaging lens of the first example, which shows the deviation of different image heights on the image formation 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 the imaging lens structure of example two.

As shown in fig. 6, 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 seventh lens E7, an infrared cut filter element E8, and an image forming surface S17.

In this example, the total effective focal length F of the imaging lens is 6.51mm, the F-number Fno of the imaging lens is 1.98 and the image height ImgH is 6.43 mm.

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. 7 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. 8 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example two. Fig. 9 shows distortion curves of the imaging lens of example two, which show values of distortion magnitudes corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the imaging lens of the second example, which shows the deviation of different image heights on the image forming 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 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 seventh lens E7, an infrared cut filter element E8, and an image forming surface S17.

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 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 convex and the image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive 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. The sixth lens element E6 has positive refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. The seventh lens E7 has negative power, and the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is concave. The infrared cut filter E8 has an object side surface S15 of the infrared cut filter and an image side surface S16 of the infrared cut filter, and the object side surface S15 of the infrared cut filter is convex. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length F of the imaging lens is 6.28mm, the F-number Fno of the imaging lens is 1.87, and the image height ImgH is 6.25 mm.

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.

TABLE 6

Fig. 12 shows an axial 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. 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 show 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 the 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 the present example four is described. Fig. 16 shows a schematic diagram of an imaging lens structure of example four.

As shown in fig. 16, 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, an infrared cut filter element E7, and an image plane 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 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 negative 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 concave. The fifth lens element E5 has positive refractive power, and the object-side surface S9 and the image-side surface S10 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. The infrared cut filter E7 has an object side surface S13 of the infrared cut filter and an image side surface S14 of the infrared cut filter, and the object side surface S13 of the infrared cut filter is concave. 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 4.53mm, the F-number Fno of the imaging lens is 1.98 and the image height ImgH is 5.29 mm.

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. 17 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. 18 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example four. Fig. 19 shows distortion curves of the imaging lens of example four, which show values of distortion magnitudes 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 surface 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 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, an infrared cut filter element E6, and an image plane 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. The infrared cut filter E6 has an object side surface S11 of the infrared cut filter and an image side surface S12 of the infrared cut filter, and the object side surface S11 of the infrared cut filter is concave. 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 4.29mm, the F-number Fno of the imaging lens is 1.90 and the image height ImgH is 3.74 mm.

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 five above.

Watch 10

Fig. 22 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. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example five. Fig. 24 shows distortion curves of the imaging lens of example five, which show 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 a deviation of different image heights on the imaging surface 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 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, an infrared cut filter element E6, and an image plane 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 concave, 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. The infrared cut filter E6 has an object side surface S11 of the infrared cut filter and an image side surface S12 of the infrared cut filter, and the object side surface S11 of the infrared cut filter is convex. 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 4.37mm, the F-number Fno of the imaging lens is 1.94 and the image height ImgH is 3.70 mm.

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. 27 shows an on-axis chromatic aberration curve of the imaging lens of example six, which shows the deviation of the convergent focal points 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 show 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 a deviation of different image heights on the imaging surface 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 image quality.

Example seven

As shown in fig. 31 to 35, an imaging lens of example seven of the present application is described. Fig. 31 shows a schematic diagram of an imaging lens structure of example seven.

As shown in fig. 31, 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, an infrared cut filter element E6, and an image plane 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. The infrared cut filter E6 has an object side surface S11 of the infrared cut filter and an image side surface S12 of the infrared cut filter, and the object side surface S11 of the infrared cut filter is convex. 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 4.36mm, the F-number Fno of the imaging lens is 1.94 and the image height ImgH is 3.74 mm.

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.

TABLE 14

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

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

To sum up, examples one to seven respectively satisfy the relationships shown in table 15.

Conditional formula/example	1	2	3	4	5	6	7
								TTL/(ImgH*Tan(Semi-FOV)	1.27	1.21	1.34	0.93	1.58	1.63	1.64
EPD*Tan(Semi-FOV)	3.10	3.16	3.00	2.59	1.91	1.88	1.87
								Fno*(TTL/EPD)	4.54	4.52	4.14	4.79	4.22	4.35	4.40
Fno*(ImgH/TTL)	1.65	1.70	1.56	1.88	1.41	1.43	1.43
								(TTL/f)*(TTL/ImgH)	1.39	1.34	1.42	1.29	1.57	1.57	1.59
10*f/\|R_TP\|	0.62	0.19	0.25	0.33	0.23	0.31	0.08
								10*f/\|f_TP\|	0.32	0.10	0.13	0.17	0.12	0.16	0.04
C_TP/E_TP	1.46	1.14	1.01	1.13	0.96	0.98	0.99
								f/fi	-1.15	-1.16	-1.11	-1.34	-1.61	-1.64	-1.63
f/fo+f/fi	-0.66	-0.63	-0.61	-0.13	-0.44	-0.45	-0.45
								f/Ri	1.20	1.20	1.16	2.88	3.50	3.56	3.57
R4/R1	1.81	1.77	1.78	4.19	3.47	3.49	3.46
								f1/f+f2/f	-1.48	-1.42	-1.39	-3.67	-1.06	-0.98	-1.05
CT1/T23	1.95	1.93	1.92	3.41	2.27	2.27	2.19
								CT3/T45	0.70	0.69	0.70	1.53	1.62	1.62	1.64
(R12+R11)/(R12-R11)	3.75	3.34	3.33
								CT6/T56	1.20	1.15	1.18

Watch 15

Table 16 gives effective focal lengths f of the imaging lenses of example one to example seven, effective focal lengths f1 to f5 of the respective lenses, and the like.

TABLE 16

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, at least five lenses having optical power, the at least five lenses comprising:

a first lens having a positive optical power;

a second lens having a negative optical power;

a negative lens of the at least five lenses near an image side surface, the negative lens having a negative power;

a positive lens adjacent to the negative lens object side, the positive lens having a positive power;

the infrared cut filter element is arranged on the object side of the imaging surface, and the object side surface of the infrared cut filter element is an aspheric surface;

the maximum half field angle Semi-FOV of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half imgH of the diagonal length of the effective pixel area on the imaging surface satisfy the following conditions: TTL/(ImgH Tan (Semi-FOV)) < 1.65.

2. The imaging lens of claim 1, wherein a maximum half field angle Semi-FOV of the imaging lens and an entrance pupil diameter EPD of the imaging lens satisfy: 1.8mm < EPD star (Semi-FOV) <3.5 mm.

3. The imaging lens of claim 1, wherein an F-number Fno of the imaging lens, an on-axis distance TTL from an object-side surface of the first lens to the imaging surface, and an entrance pupil diameter EPD of the imaging lens satisfy: fno (TTL/EPD) is not less than 4.0 and not more than 4.8.

4. The imaging lens according to claim 1, wherein an F-number Fno of the imaging lens, an on-axis distance TTL from an object side surface of the first lens to the imaging surface, and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: 1.4< Fno (ImgH/TTL) < 2.0.

5. The imaging lens of claim 1, wherein an on-axis distance TTL from an object side surface of the first lens element to the imaging surface and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: (TTL/f) (TTL/ImgH) < 1.60.

6. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens and a radius of curvature R of an object side surface of the infrared cut filter element_TPSatisfies the following conditions: 10 f/| R_TP|<1.0。

7. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens and an effective focal length f of the infrared cut filter element are set to be equal to each other_TPSatisfies the following conditions: 10 f/| f_TP|<0.5。

8. The imaging lens according to claim 1, wherein a center thickness C of the infrared cut filter element_TPEdge thickness E of the infrared cut filter element at the maximum effective radius_TPSatisfies the following conditions: 0.9<C_TP/E_TP≤1.5。

9. The imaging lens of claim 1, wherein an effective focal length f of the imaging lens and an effective focal length fi of the negative lens satisfy: -2< f/fi < -1.

10. An imaging lens comprising, in order from an object side to an image side along an optical axis, at least five lenses having optical power, the at least five lenses comprising:

a first lens having a positive optical power;

a second lens having a negative optical power;

the F number Fno of the camera lens, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the entrance pupil diameter EPD of the camera lens meet the following requirements: fno (TTL/EPD) is not less than 4.0 and not more than 4.8.