CN216411706U

CN216411706U - Optical imaging lens

Info

Publication number: CN216411706U
Application number: CN202122756780.0U
Authority: CN
Inventors: 吕赛锋; 何旦; 姚嘉诚; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-04-29
Anticipated expiration: 2031-11-11

Abstract

The utility model provides an optical imaging lens. The optical imaging lens sequentially comprises from an object side to an image side along an optical axis: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens having a positive optical power; an eighth lens; wherein at least one of the object-side surface and the image-side surface of the first lens has at least one inflection point; the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens meet the following conditions: f tan (FOV/2) >4.0 mm. The utility model solves the problem that the optical imaging lens in the prior art has large image plane, ultra-large aperture and miniaturization which are difficult to realize simultaneously.

Description

Optical imaging lens

Technical Field

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

Background

In recent years, with the rapid development of smart phones, the trend of using mobile phones to take pictures to replace traditional cameras is more and more obvious, and people are more and more interested in mobile phones with high-quality photographing functions. With the continuous upgrading of the camera shooting effect of each terminal, the optical imaging lens matched with the electronic photosensitive element is also continuously upgraded and updated. Mobile phone manufacturers have made higher demands on various aspects of the optical imaging lens design process. The prior art provides an optical imaging lens, which can satisfy a large image plane and an aperture, but the whole volume of the optical imaging lens is large, and the requirement of miniaturization is difficult to satisfy.

That is to say, the optical imaging lens in the prior art has the problem that large image plane, ultra-large aperture and miniaturization are difficult to realize simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an optical imaging lens, which solves the problem that the optical imaging lens in the prior art has large image plane, ultra-large aperture and miniaturization which are difficult to realize simultaneously.

In order to achieve the above object, according to an aspect of the present invention, there is provided an optical imaging lens comprising, in order from an object side to an image side along an optical axis: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens having a positive optical power; an eighth lens; wherein at least one of the object-side surface and the image-side surface of the first lens has at least one inflection point; the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens meet the following conditions: f tan (FOV/2) >4.0 mm.

Further, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.3.

Further, the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: 0< (f7-f8)/f1< 1.0.

Further, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, and the effective focal length f3 of the third lens satisfy: 0< f3/(R5-R6) < 1.0.

Further, a vertical distance Yc11 from the inflection point on the object-side surface of the first lens to the optical axis and a vertical distance Yc12 from the inflection point on the image-side surface of the first lens to the optical axis satisfy: 0.3< Yc12/Yc11< 1.3.

Further, the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the effective focal length f4 of the fourth lens satisfy: -1.0< (R7+ R8)/f4< 0.

Further, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -1.0< f6/(f5-f6) <0.

Further, a radius of curvature R1 of the object-side surface of the first lens, a radius of curvature R2 of the image-side surface of the first lens, a radius of curvature R3 of the object-side surface of the second lens, and a radius of curvature R4 of the image-side surface of the second lens satisfy: -2.0< (R1+ R2)/(R3+ R4) < -0.5.

Further, a curvature radius R9 of an object-side surface of the fifth lens, a curvature radius R10 of an image-side surface of the fifth lens, a curvature radius R15 of an object-side surface of the eighth lens, and a curvature radius R16 of an image-side surface of the eighth lens satisfy: -1.0< R10/R9+ R16/R15< 0.

Further, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R13 of the object-side surface of the seventh lens satisfy: 0< R11/(R11-R13) < 1.0.

Further, the maximum effective radius DT72 of the image side surface of the seventh lens and the maximum effective radius DT81 of the object side surface of the eighth lens satisfy: 0.1mm < DT81-DT72<0.6 mm.

Further, a combined focal length f12 of the first lens and the second lens and a combined focal length f34 of the third lens and the fourth lens satisfy: 0< f34/f12< 1.0.

Further, a combined focal length f56 of the fifth lens and the sixth lens and a combined focal length f78 of the seventh lens and the eighth lens satisfy: -1.0< f78/f56 <0.

Further, a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.5< CT3/(CT1+ CT2+ CT4) < 1.5.

Further, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: 0< (CT7+ CT8)/(CT5+ CT6) < 1.0.

Further, an air interval T45 of the fourth lens and the fifth lens on the optical axis, an air interval T67 of the sixth lens and the seventh lens on the optical axis, and an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.3< T45/(T67+ T78) < 0.8.

Further, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 0.5< DT41/DT11< 1.0.

Furthermore, the first lens has positive focal power, the object-side surface of the first lens is a concave surface, and the image-side surface of the first lens is a convex surface.

Furthermore, the third lens has positive focal power, the object-side surface of the third lens is a convex surface, and the image-side surface of the third lens is a convex surface; the fourth lens has negative focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

Furthermore, the sixth lens has negative focal power, and the object side surface of the sixth lens is a concave surface; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface.

According to another aspect of the present invention, there is provided an optical imaging lens, comprising, in order from an object side to an image side along an optical axis: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens having a positive optical power; an eighth lens; wherein at least one of the object-side surface and the image-side surface of the first lens has at least one inflection point; the maximum effective radius DT72 of the image side surface of the seventh lens and the maximum effective radius DT81 of the object side surface of the eighth lens satisfy the following condition: 0.1mm < DT81-DT72<0.6 mm.

Further, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.3; the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy that: 0< (f7-f8)/f1< 1.0.

Further, the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens satisfy: f tan (FOV/2) >4.0 mm; the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens and the effective focal length f3 of the third lens satisfy that: 0< f3/(R5-R6) < 1.0.

By applying the technical scheme of the utility model, the optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side to an image side along an optical axis; the seventh lens has positive focal power; wherein at least one of the object-side surface and the image-side surface of the first lens has at least one inflection point; the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens meet the following conditions: f tan (FOV/2) >4.0 mm.

The effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens are constrained within a reasonable range, so that the optical imaging lens is ensured to reduce the deflection angle of incident light on the basis of a large image plane, the relative aperture of the optical system is continuously increased, more light passing amounts are obtained, the imaging effect of a dark state environment is improved, the close-range imaging effect of the large aperture system is improved, and the imaging quality is ensured. In addition, the optical imaging lens of the present application is composed of eight lenses, which is advantageous for achieving miniaturization.

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 is a schematic structural view showing an optical 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 optical imaging lens of fig. 1;

fig. 5 is a schematic view showing a configuration of an optical imaging lens according to a second example of the present invention;

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

fig. 9 is a schematic structural view showing an optical imaging lens of 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 optical imaging lens in fig. 9, respectively;

fig. 13 is a schematic view showing a configuration of an optical imaging lens of 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 optical imaging lens in fig. 13, respectively;

fig. 17 is a schematic structural view showing an optical imaging lens of example five of the present invention;

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

fig. 21 is a schematic structural view showing an optical imaging lens of 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 optical imaging lens in fig. 21, respectively;

fig. 25 is a schematic structural view showing an optical imaging lens of example seven of the present invention;

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

fig. 29 is a schematic structural view showing an optical imaging lens of example eight of the present invention;

fig. 30 to 32 show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens in fig. 29, respectively.

Wherein the figures include the following reference numerals:

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, sixth lens; s11, the object-side surface of the sixth lens element; s12, an image side surface of the sixth lens element; e7, seventh lens; s13, an object-side surface of the seventh lens; s14, an image side surface of the seventh lens element; e8, eighth lens; s15, an object-side surface of the eighth lens element; s16, an image side surface of the eighth lens element; e9, optical filters; s17, the object side surface of the optical filter; s18, the image side surface of the optical filter; and S19, 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 optical imaging lens, aiming at solving the problem that the optical imaging lens in the prior art has large image plane, ultra-large aperture and difficulty in realizing miniaturization at the same time.

Example one

As shown in fig. 1 to 32, the optical imaging lens includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element; the seventh lens has positive focal power; wherein at least one of the object-side surface and the image-side surface of the first lens has at least one inflection point; the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens meet the following conditions: f tan (FOV/2) >4.0 mm.

Preferably, 4.1mm < f tan (FOV/2) <4.3 mm.

In the present embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.3. The ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is restricted within a reasonable range, so that more light flux can be obtained, and the imaging effect of the optical imaging lens under a dark state environment can be improved. Preferably, f/EPD is 1.20.

In the present embodiment, the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: 0< (f7-f8)/f1< 1.0. The conditional expression is satisfied, the focal lengths of the first lens, the seventh lens and the eighth lens are favorably and reasonably distributed, and the aperture is favorably increased while the close-range imaging effect is improved. Preferably, 0.1< (f7-f8)/f1< 0.9.

In the present embodiment, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, and the effective focal length f3 of the third lens satisfy: 0< f3/(R5-R6) < 1.0. The condition is satisfied, the ghost image reflected in the lens is improved, and the effects of reducing aberration and improving imaging quality are achieved in the ultra-large aperture. Preferably, 0.4< f3/(R5-R6) < 0.5.

In the present embodiment, a vertical distance Yc11 from the inflection point on the object-side surface of the first lens to the optical axis and a vertical distance Yc12 from the inflection point on the image-side surface of the first lens to the optical axis satisfy: 0.3< Yc12/Yc11< 1.3. The condition is satisfied, so that the optical imaging lens can converge incident light rays and reduce the light ray deflection angle in a large aperture state. Preferably 0.8< Yc12/Yc11< 1.0.

In the present embodiment, the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the effective focal length f4 of the fourth lens satisfy: -1.0< (R7+ R8)/f4< 0. The optical lens meets the conditional expression, achieves the effects of reducing aberration and improving imaging quality in a large aperture, and simultaneously weakens the reflection ghost image in the fourth lens. Preferably, -0.6< (R7+ R8)/f4< -0.4.

In the present embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -1.0< f6/(f5-f6) <0. The condition is satisfied, the reasonable distribution of the focal lengths of the fifth lens and the sixth lens is facilitated, and the transverse chromatic aberration of the optical system is improved. Preferably, -0.7< f6/(f5-f6) < -0.5.

In the present embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: -2.0< (R1+ R2)/(R3+ R4) < -0.5. The conditional expression is satisfied, the curvature radiuses of the first lens and the second lens are favorably and reasonably distributed, and the deflection angle of light rays is favorably reduced in the process of increasing the clear aperture, so that the purposes of reducing sensitivity and receiving light are achieved. Preferably, -1.1< (R1+ R2)/(R3+ R4) < -0.8.

In the present embodiment, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R10 of the image-side surface of the fifth lens, the radius of curvature R15 of the object-side surface of the eighth lens, and the radius of curvature R16 of the image-side surface of the eighth lens satisfy: -1.0< R10/R9+ R16/R15< 0. The condition is satisfied, the transition of light is facilitated, the deflection angle is reduced, and the imaging effect of close range is improved. Preferably, -0.7< R10/R9+ R16/R15< -0.4.

In the present embodiment, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R13 of the object-side surface of the seventh lens satisfy: 0< R11/(R11-R13) < 1.0. Satisfying the conditional expression is beneficial to reasonably controlling the shapes of the sixth lens and the seventh lens and controlling the amount of the air gap to obtain the processing characteristics of the lens. Preferably, 0.4< R11/(R11-R13) < 0.7.

In the present embodiment, the maximum effective radius DT72 of the image-side surface of the seventh lens and the maximum effective radius DT81 of the object-side surface of the eighth lens satisfy: 0.1mm < DT81-DT72<0.6 mm. The condition is satisfied, and the miniaturization of the optical system is ensured while the image plane is increased. Preferably, 0.2mm < DT81-DT72<0.5 mm.

In the present embodiment, a combined focal length f12 of the first lens and the second lens and a combined focal length f34 of the third lens and the fourth lens satisfy: 0< f34/f12< 1.0. The condition is satisfied, the focal lengths of the first lens to the fourth lens are favorably and reasonably distributed, and the effects of increasing the light flux and improving the imaging quality can be achieved. Preferably, 0.1< f34/f12< 1.0.

In the present embodiment, a combined focal length f56 of the fifth lens and the sixth lens and a combined focal length f78 of the seventh lens and the eighth lens satisfy: -1.0< f78/f56 <0. The condition is satisfied, the focal lengths of the fifth lens and the eighth lens are favorably and reasonably distributed, and the effect of improving the close-range imaging quality can be achieved. Preferably, -1.0< f78/f56< -0.5.

In the present embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.5< CT3/(CT1+ CT2+ CT4) < 1.5. The condition is satisfied, which is beneficial to ensuring the processing characteristic of the lens on the basis of increasing the aperture. Preferably, 0.8< CT3/(CT1+ CT2+ CT4) < 1.2.

In the present embodiment, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT6 of the sixth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis, and the central thickness CT8 of the eighth lens on the optical axis satisfy: 0< (CT7+ CT8)/(CT5+ CT6) < 1.0. The condition is satisfied, and the processing characteristics of the lens are improved on the basis of improving close-range imaging. Preferably, 0.6< (CT7+ CT8)/(CT5+ CT6) < 0.9.

In the present embodiment, an air interval T45 of the fourth lens and the fifth lens on the optical axis, an air interval T67 of the sixth lens and the seventh lens on the optical axis, and an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.3< T45/(T67+ T78) < 0.8. The condition is satisfied, air gaps among the lenses are favorably and reasonably utilized, so that the light deflection angle is reduced, the sensitivity is reduced, and the imaging quality of a close scene can be ensured. Preferably, 0.4< T45/(T67+ T78) < 0.6.

In the present embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT41 of the object-side surface of the fourth lens satisfy: 0.5< DT41/DT11< 1.0. The condition is satisfied, the appearance attractiveness of the optical imaging lens is guaranteed, and meanwhile the miniaturization of the system is controlled. Preferably 0.6< DT41/DT11< 0.8.

In this embodiment, the first lens element has a positive refractive power, the object-side surface of the first lens element is concave, and the image-side surface of the first lens element is convex. On the basis of increasing the clear aperture, the light deflection angle is slowed down, and the sensitivity is reduced.

In this embodiment, the third lens element has positive refractive power, the object-side surface of the third lens element is a convex surface, and the image-side surface of the third lens element is a convex surface; the fourth lens has negative focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface. Therefore, under the condition of large aperture, the light deflection is improved, the aberration is reduced, and the imaging quality is improved.

In this embodiment, the sixth lens element has a negative refractive power, and the object-side surface of the sixth lens element is concave; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface. This arrangement is advantageous for improving the imaging quality of the close range.

Example two

As shown in fig. 1 to 32, the optical imaging lens includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element, the seventh lens element having positive optical power; wherein at least one of the object-side surface and the image-side surface of the first lens has at least one inflection point; the maximum effective radius DT72 of the image side surface of the seventh lens and the maximum effective radius DT81 of the object side surface of the eighth lens satisfy the following condition: 0.1mm < DT81-DT72<0.6 mm.

Preferably, 0.2mm < DT81-DT72<0.5 mm.

At least one surface in the object side face and the image side face of the first lens is provided with at least one inflection point, so that the optical imaging lens is guaranteed to reduce the deflection angle of incident light on the basis of a large image plane, the relative aperture of the optical system is continuously increased, more light passing quantities are obtained, the imaging effect of a dark state environment is improved, the close-range imaging effect of the large aperture system is improved, and the imaging quality is guaranteed. By restricting the relation between the maximum effective radius DT72 of the image side surface of the seventh lens and the maximum effective radius DT81 of the object side surface of the eighth lens within a reasonable range, the miniaturization of the optical system is ensured while the image plane is increased. In addition, the optical imaging lens of the present application is composed of eight lenses, which is advantageous for achieving miniaturization.

In the present embodiment, the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens satisfy: f tan (FOV/2) >4.0 mm. The effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens are constrained within a reasonable range, so that the optical imaging lens is ensured to reduce the deflection angle of incident light on the basis of a large image plane, the relative aperture of the optical system is continuously increased, more light passing amounts are obtained, the imaging effect of a dark state environment is improved, the close-range imaging effect of the large aperture system is improved, and the imaging quality is ensured. Preferably, 4.1mm < f tan (FOV/2) <4.3 mm.

The above-described optical imaging lens may further optionally include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the imaging surface.

The optical imaging lens in the present application may employ a plurality of lenses, for example, the above-mentioned eight lenses. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the optical imaging lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The left side is the object side and the right side is the image side.

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

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

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

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

Example one

As shown in fig. 1 to 4, an optical imaging lens of the first example of the present application is described. Fig. 1 shows a schematic diagram of an optical imaging lens structure of example one.

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side: the lens system comprises 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 eighth lens E8, a filter E9 and an imaging surface S19.

The first lens element E1 has positive refractive power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is convex. 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 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 and the image-side surface S10 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive refractive power, and the object-side surface S13 of the seventh lens element is convex, and the image-side surface S14 of the seventh lens element is convex. The eighth lens element E8 has negative power, and the object-side surface S15 of the eighth lens element is concave, and the image-side surface S16 of the eighth lens element is concave. The filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 5.03mm, the half Semi-FOV of the maximum field angle of the optical imaging lens is 39.5 °, the total length TTL of the optical imaging lens is 7.90mm, and the image height ImgH is 4.23 mm.

Table 1 shows a basic structural parameter table of the optical imaging lens of example one, in which the units of the radius of curvature, 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 to the eighth lens element E8 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 coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 that can be used for each of the aspherical mirrors S1-S16 in example one.

Flour mark	A4	A6	A8	A10	A12
						S1	1.6871E+00	-4.7484E-02	5.8791E-03	6.6595E-04	3.2620E-04
S2	1.2468E+00	-4.7646E-02	1.7273E-02	-2.6372E-03	1.5922E-03
						S3	-7.6693E-01	-3.5462E-02	-1.7407E-02	2.4262E-03	-1.3155E-03
S4	-4.8476E-01	-1.9470E-02	5.3938E-03	-4.3656E-03	1.1346E-03
						S5	4.1596E-01	-2.5154E-02	2.7423E-02	-1.3242E-02	4.7387E-03
S6	2.1235E-01	-2.0179E-02	-1.0180E-03	-1.7475E-04	6.4143E-04
						S7	-3.1924E-01	-1.6656E-02	1.0653E-02	1.3046E-03	-1.2263E-03
S8	-2.8604E-01	-5.5734E-03	6.4130E-03	2.5639E-03	-5.6664E-04
						S9	2.6081E-01	-9.6656E-03	-1.0469E-02	-5.3778E-04	-3.2855E-04
S10	5.2846E-01	-1.9438E-02	-1.2744E-02	-5.9625E-03	-4.3451E-03
						S11	9.7492E-02	2.7896E-02	2.4701E-03	-3.2335E-04	-4.9602E-03
S12	-3.4252E-01	7.2741E-02	6.8230E-03	4.9223E-03	8.5773E-04
						S13	-8.4178E-01	-1.4077E-01	4.2474E-02	8.3815E-03	9.2445E-03
S14	-2.7896E-01	3.9322E-02	9.5037E-02	-3.5335E-02	6.8832E-04
						S15	-8.5957E-01	4.7575E-01	-1.3084E-01	4.4386E-03	1.2455E-02
S16	-2.8754E+00	4.5696E-01	-1.5578E-01	4.9600E-02	-1.6323E-02
						Flour mark	A14	A16	A18	A20	A22
S1	-7.2010E-04	3.6370E-04	-1.7870E-04	1.2181E-04	0.0000E+00
						S2	-5.8741E-04	1.1164E-04	-1.0060E-04	-1.5781E-05	0.0000E+00
S3	-3.6937E-04	1.6074E-06	-4.0933E-06	0.0000E+00	0.0000E+00
						S4	-6.3332E-04	5.3464E-05	5.6070E-07	7.9242E-07	0.0000E+00
S5	-1.1978E-03	2.7187E-04	1.7439E-05	1.8238E-06	0.0000E+00
						S6	4.3585E-05	-1.9632E-05	-1.0776E-07	0.0000E+00	0.0000E+00
S7	4.0787E-04	-5.5990E-05	-5.0714E-07	0.0000E+00	0.0000E+00
						S8	3.9381E-04	7.9493E-06	8.6711E-07	0.0000E+00	0.0000E+00
S9	6.6291E-05	9.3745E-05	8.9632E-07	0.0000E+00	0.0000E+00
						S10	-3.4035E-04	1.6856E-04	7.5110E-08	-4.8575E-08	0.0000E+00
S11	-9.6381E-04	-5.6408E-05	3.1241E-07	1.1279E-08	0.0000E+00
						S12	-1.4412E-04	1.4103E-04	-2.7983E-06	-1.4195E-07	0.0000E+00
S13	2.5950E-03	8.7185E-04	3.9961E-05	3.0346E-06	0.0000E+00
						S14	-5.4941E-04	9.1541E-04	2.0306E-05	6.5926E-07	0.0000E+00
S15	-5.1239E-03	9.4358E-04	3.6043E-05	2.1954E-06	1.4269E-07
						S16	1.9501E-03	6.7885E-04	1.7673E-05	4.9611E-07	0.0000E+00

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the optical imaging lens of example one, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 3 shows astigmatism curves of the optical imaging lens of example one, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the optical imaging lens of example one, which indicate distortion magnitude values corresponding to different angles of view.

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

Example two

As shown in fig. 5 to 8, an optical 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 optical imaging lens structure of example two.

As shown in fig. 5, the optical imaging lens includes, in order from an object side to an image side: the lens system comprises 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 eighth lens E8, a filter E9 and an imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 5.03mm, the half Semi-FOV of the maximum field angle of the optical imaging lens is 39.5 °, the total length TTL of the optical imaging lens is 7.49mm, and the image height ImgH is 4.21 mm.

Table 3 shows a basic structural parameter table of the optical imaging lens of example two, in which the units of the radius of curvature, 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 on-axis chromatic aberration curve of the optical imaging lens of example two, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 7 shows astigmatism curves of the optical imaging lens of example two, which represent meridional field curvature and sagittal field curvature. Fig. 8 shows distortion curves of the optical imaging lens of example two, which indicate values of distortion magnitudes corresponding to different angles of view.

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

Example III

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

As shown in fig. 9, the optical imaging lens includes, in order from an object side to an image side: the lens system comprises 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 eighth lens E8, a filter E9 and an imaging surface S19.

The first lens element E1 has positive refractive power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is convex. The second lens element E2 has positive refractive 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 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 and the image-side surface S10 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative power, and the object-side surface S11 of the sixth lens element is concave, and the image-side surface S12 of the sixth lens element is convex. The seventh lens element E7 has positive refractive power, and the object-side surface S13 of the seventh lens element is convex, and the image-side surface S14 of the seventh lens element is convex. The eighth lens element E8 has negative power, and the object-side surface S15 of the eighth lens element is concave, and the image-side surface S16 of the eighth lens element is concave. The filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 5.03mm, the half Semi-FOV of the maximum field angle of the optical imaging lens is 39.5 °, the total length TTL of the optical imaging lens is 7.43mm, and the image height ImgH is 4.19 mm.

Table 5 shows a basic structural parameter table of the optical imaging lens of example three, in which the units of the radius of curvature, thickness/distance, focal length, and 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. 10 shows an on-axis chromatic aberration curve of the optical imaging lens of example three, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 11 shows astigmatism curves of the optical imaging lens of example three, which represent meridional field curvature and sagittal field curvature. Fig. 12 shows distortion curves of the optical imaging lens of example three, which represent distortion magnitude values corresponding to different angles of view.

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

Example four

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

As shown in fig. 13, the optical imaging lens includes, in order from an object side to an image side: the lens system comprises 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 eighth lens E8, a filter E9 and an imaging surface S19.

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

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

Example five

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

As shown in fig. 17, the optical imaging lens includes, in order from an object side to an image side: the lens system comprises 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 eighth lens E8, a filter E9 and an imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 5.15mm, the Semi-FOV of the maximum field angle of the optical imaging lens is 39.3 °, the total length TTL of the optical imaging lens is 7.45mm, and the image height ImgH is 4.33 mm.

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

Watch 10

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

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

Example six

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

As shown in fig. 21, the optical imaging lens includes, in order from an object side to an image side: the lens system comprises 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 eighth lens E8, a filter E9 and an imaging surface S19.

The first lens element E1 has positive refractive power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is convex. The second lens element E2 has positive refractive 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 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 and the image-side surface S10 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive refractive power, and the object-side surface S13 of the seventh lens element is convex, and the image-side surface S14 of the seventh lens element is convex. The eighth lens element E8 has negative power, and the object-side surface S15 of the eighth lens element is concave, and the image-side surface S16 of the eighth lens element is concave. The filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 5.18mm, the Semi-FOV of the maximum field angle of the optical imaging lens is 39.3 °, the total length TTL of the optical imaging lens is 7.49mm, and the image height ImgH is 4.36 mm.

Table 11 shows a basic structural parameter table of the optical imaging lens of example six, in which the units of the radius of curvature, thickness/distance, focal length, and 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 optical imaging lens of example six, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of example six. Fig. 24 shows distortion curves of the optical imaging lens of example six, which represent distortion magnitude values corresponding to different angles of view.

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

Example seven

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

As shown in fig. 25, the optical imaging lens includes, in order from an object side to an image side: the lens system comprises 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 eighth lens E8, a filter E9 and an imaging surface S19.

The first lens element E1 has positive refractive power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is convex. The second lens element E2 has positive refractive 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 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 and the image-side surface S10 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has positive refractive power, and the object-side surface S13 of the seventh lens element is convex, and the image-side surface S14 of the seventh lens element is concave. The eighth lens element E8 has negative power, and the object-side surface S15 of the eighth lens element is concave, and the image-side surface S16 of the eighth lens element is concave. The filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 5.18mm, the Semi-FOV of the maximum field angle of the optical imaging lens is 39.3 °, the total length TTL of the optical imaging lens is 7.54mm, and the image height ImgH is 4.36 mm.

Table 13 shows a basic structural parameter table of the optical imaging lens of example seven, in which the units of the radius of curvature, 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. 26 shows an on-axis chromatic aberration curve of the optical imaging lens of example seven, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 27 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of example seven. Fig. 28 shows distortion curves of the optical imaging lens of example seven, which represent distortion magnitude values corresponding to different angles of view.

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

Example eight

As shown in fig. 29 to 32, an optical imaging lens of example eight of the present application is described. Fig. 29 shows a schematic diagram of an optical imaging lens structure of example eight.

As shown in fig. 29, the optical imaging lens includes, in order from an object side to an image side: the lens system comprises 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 eighth lens E8, a filter E9 and an imaging surface S19.

The first lens element E1 has positive refractive power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is convex. The second lens element E2 has positive refractive 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 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 and the image-side surface S10 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative power, and the object-side surface S11 of the sixth lens element is concave, and the image-side surface S12 of the sixth lens element is convex. The seventh lens element E7 has positive refractive power, and the object-side surface S13 of the seventh lens element is convex, and the image-side surface S14 of the seventh lens element is concave. The eighth lens element E8 has negative power, and the object-side surface S15 of the eighth lens element is concave, and the image-side surface S16 of the eighth lens element is concave. The filter E9 has an object side surface S17 of the filter and an image side surface S18 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 5.24mm, the Semi-FOV of the maximum field angle of the optical imaging lens is 39.3 °, the total length TTL of the optical imaging lens is 7.60mm, and the image height ImgH is 4.41 mm.

Table 15 shows a basic structural parameter table of the optical imaging lens of example eight, in which the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Watch 15

Table 16 shows the high-order term coefficients that can be used for each aspherical mirror surface in example eight, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 16

Fig. 30 shows an on-axis chromatic aberration curve of the optical imaging lens of example eight, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 31 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical imaging lens of example eight. Fig. 32 shows distortion curves of the optical imaging lens of example eight, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 30 to 32, the optical imaging lens according to example eight can achieve good imaging quality.

To sum up, examples one to eight satisfy the relationships shown in table 17, respectively.

Table 17 table 18 gives effective focal lengths f of the optical imaging lenses of example one to example eight, effective focal lengths f1 to f8 of the respective lenses, and the like.

Parameter/example	1	2	3	4	5	6	7	8
									f1(mm)	14.98	17.03	22.35	22.58	24.74	29.75	52.97	89.15
f2(mm)	-188.17	-142.98	197.75	146.42	397.65	3065.32	234.47	109.60
									f3(mm)	7.26	6.33	6.04	6.11	5.86	5.48	5.16	5.18
f4(mm)	-12.00	-11.17	-10.60	-10.66	-10.46	-10.57	-11.51	-11.78
									f5(mm)	5.95	5.93	6.06	6.05	6.05	6.00	6.62	7.29
f6(mm)	-11.60	-10.92	-10.58	-10.61	-10.26	-9.34	-8.36	-8.69
									f7(mm)	7.95	7.44	7.80	7.83	7.79	7.72	6.96	7.05
f8(mm)	-4.11	-3.90	-4.07	-4.07	-4.08	-4.01	-4.04	-4.30
									f(mm)	5.03	5.03	5.03	5.03	5.15	5.18	5.18	5.24
TTL(mm)	7.90	7.49	7.43	7.43	7.45	7.49	7.54	7.60
									ImgH(mm)	4.23	4.21	4.19	4.19	4.33	4.36	4.36	4.41
Semi-FOV(°)	39.5	39.5	39.5	39.5	39.3	39.3	39.3	39.3
									f/EPD	1.20	1.20	1.20	1.20	1.20	1.20	1.20	1.20

Watch 18

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 optical imaging lens described above.

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

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

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

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

Claims

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

a first lens;

a second lens;

a third lens;

a fourth lens;

a fifth lens;

a sixth lens;

a seventh lens having a positive optical power;

an eighth lens;

wherein at least one of the object-side surface and the image-side surface of the first lens has at least one inflection point; the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens meet the following conditions: f tan (FOV/2) >4.0 mm.

2. The optical imaging lens of claim 1, wherein an effective focal length f of the optical imaging lens and an entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.3.

3. The optical imaging lens of claim 1, wherein the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0< (f7-f8)/f1< 1.0.

4. The optical imaging lens of claim 1, wherein the radius of curvature of the object-side surface of the third lens, R5, the radius of curvature of the image-side surface of the third lens, R6, and the effective focal length f3 of the third lens satisfy: 0< f3/(R5-R6) < 1.0.

5. The optical imaging lens of claim 1, wherein a vertical distance Yc11 from an inflection point on an object-side surface of the first lens to the optical axis and a vertical distance Yc12 from the inflection point on an image-side surface of the first lens to the optical axis satisfy: 0.3< Yc12/Yc11< 1.3.

6. The optical imaging lens of claim 1, wherein the radius of curvature of the object-side surface of the fourth lens, R7, the radius of curvature of the image-side surface of the fourth lens, R8, and the effective focal length f4 of the fourth lens satisfy: -1.0< (R7+ R8)/f4< 0.

7. The optical imaging lens of claim 1, wherein an effective focal length f5 of the fifth lens and an effective focal length f6 of the sixth lens satisfy: -1.0< f6/(f5-f6) <0.

8. The optical imaging lens of claim 1, wherein the radius of curvature of the object-side surface of the first lens, R1, R2, R3 and R4 satisfy: -2.0< (R1+ R2)/(R3+ R4) < -0.5.

9. The optical imaging lens of claim 1, wherein a radius of curvature R9 of the object-side surface of the fifth lens, a radius of curvature R10 of the image-side surface of the fifth lens, a radius of curvature R15 of the object-side surface of the eighth lens, and a radius of curvature R16 of the image-side surface of the eighth lens satisfy: -1.0< R10/R9+ R16/R15< 0.

10. The optical imaging lens of claim 1, wherein a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R13 of the object-side surface of the seventh lens satisfy: 0< R11/(R11-R13) < 1.0.

11. The optical imaging lens of claim 1, wherein a maximum effective radius DT72 of an image side surface of the seventh lens and a maximum effective radius DT81 of an object side surface of the eighth lens satisfy: 0.1mm < DT81-DT72<0.6 mm.

12. The optical imaging lens of claim 1, wherein a combined focal length f12 of the first and second lenses and a combined focal length f34 of the third and fourth lenses satisfy: 0< f34/f12< 1.0.

13. The optical imaging lens of claim 1, wherein a combined focal length f56 of the fifth lens and the sixth lens and a combined focal length f78 of the seventh lens and the eighth lens satisfy: -1.0< f78/f56 <0.

14. The optical imaging lens of claim 1, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.5< CT3/(CT1+ CT2+ CT4) < 1.5.

15. The optical imaging lens of claim 1, wherein a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: 0< (CT7+ CT8)/(CT5+ CT6) < 1.0.

16. The optical imaging lens according to claim 1, characterized in that an air interval T45 of the fourth lens and the fifth lens on the optical axis, an air interval T67 of the sixth lens and the seventh lens on the optical axis, and an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.3< T45/(T67+ T78) < 0.8.

17. The optical imaging lens of claim 1, wherein a maximum effective radius DT11 of an object side surface of the first lens and a maximum effective radius DT41 of an object side surface of the fourth lens satisfy: 0.5< DT41/DT11< 1.0.

18. The optical imaging lens of claim 1, wherein the first lens has a positive optical power, wherein the object-side surface of the first lens is concave, and wherein the image-side surface of the first lens is convex.

19. The optical imaging lens as claimed in claim 1, wherein the third lens has a positive optical power, the object-side surface of the third lens is convex, and the image-side surface of the third lens is convex; the fourth lens has negative focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

20. The optical imaging lens of claim 1, wherein the sixth lens has a negative optical power, and an object-side surface of the sixth lens is a concave surface; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface.

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

a first lens;

a second lens;

a third lens;

a fourth lens;

a fifth lens;

a sixth lens;

a seventh lens having a positive optical power;

an eighth lens;

wherein at least one of the object-side surface and the image-side surface of the first lens has at least one inflection point; the maximum effective radius DT72 of the image side surface of the seventh lens and the maximum effective radius DT81 of the object side surface of the eighth lens satisfy the following condition: 0.1mm < DT81-DT72<0.6 mm.

22. The optical imaging lens of claim 21, wherein an effective focal length f of the optical imaging lens and an entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.3; the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0< (f7-f8)/f1< 1.0.

23. The optical imaging lens of claim 21, wherein the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens satisfy: f tan (FOV/2) >4.0 mm; the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens and the effective focal length f3 of the third lens satisfy: 0< f3/(R5-R6) < 1.0.

24. The optical imaging lens of claim 21, wherein a vertical distance Yc11 from an inflection point on an object-side surface of the first lens to the optical axis and a vertical distance Yc12 from the inflection point on an image-side surface of the first lens to the optical axis satisfy: 0.3< Yc12/Yc11< 1.3.

25. The optical imaging lens of claim 21, wherein the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the effective focal length f4 of the fourth lens satisfy: -1.0< (R7+ R8)/f4< 0.

26. The optical imaging lens of claim 21, wherein an effective focal length f5 of the fifth lens and an effective focal length f6 of the sixth lens satisfy: -1.0< f6/(f5-f6) <0.

27. The optical imaging lens of claim 21, wherein the radius of curvature of the object-side surface of the first lens R1, the radius of curvature of the image-side surface of the first lens R2, the radius of curvature of the object-side surface of the second lens R3, and the radius of curvature of the image-side surface of the second lens R4 satisfy: -2.0< (R1+ R2)/(R3+ R4) < -0.5.

28. The optical imaging lens of claim 21, wherein the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R10 of the image-side surface of the fifth lens, the radius of curvature R15 of the object-side surface of the eighth lens, and the radius of curvature R16 of the image-side surface of the eighth lens satisfy: -1.0< R10/R9+ R16/R15< 0.

29. The optical imaging lens of claim 21, wherein a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R13 of the object-side surface of the seventh lens satisfy: 0< R11/(R11-R13) < 1.0.

30. The optical imaging lens of claim 21, wherein a combined focal length f12 of the first and second lenses and a combined focal length f34 of the third and fourth lenses satisfy: 0< f34/f12< 1.0.

31. The optical imaging lens of claim 21, wherein a combined focal length f56 of the fifth lens and the sixth lens and a combined focal length f78 of the seventh lens and the eighth lens satisfy: -1.0< f78/f56 <0.

32. The optical imaging lens of claim 21, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT4 of the fourth lens on the optical axis satisfy: 0.5< CT3/(CT1+ CT2+ CT4) < 1.5.

33. The optical imaging lens of claim 21, wherein a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: 0< (CT7+ CT8)/(CT5+ CT6) < 1.0.

34. The optical imaging lens of claim 21, wherein an air interval T45 on the optical axis of the fourth lens and the fifth lens, an air interval T67 on the optical axis of the sixth lens and the seventh lens, and an air interval T78 on the optical axis of the seventh lens and the eighth lens satisfy: 0.3< T45/(T67+ T78) < 0.8.

35. The optical imaging lens of claim 21, wherein a maximum effective radius DT11 of the object side surface of the first lens and a maximum effective radius DT41 of the object side surface of the fourth lens satisfy: 0.5< DT41/DT11< 1.0.

36. The optical imaging lens of claim 21, wherein the first lens has a positive optical power, wherein the object side surface of the first lens is concave, and wherein the image side surface of the first lens is convex.

37. The optical imaging lens of claim 21, wherein the third lens has a positive optical power, the object-side surface of the third lens is convex, and the image-side surface of the third lens is convex; the fourth lens has negative focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

38. The optical imaging lens of claim 21, wherein the sixth lens has a negative optical power, and an object-side surface of the sixth lens is concave; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface.