CN113985580A

CN113985580A - Camera lens

Info

Publication number: CN113985580A
Application number: CN202111328177.0A
Authority: CN
Inventors: 周进; 张晓彬; 闻人建科; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-01-28

Abstract

The invention provides a camera lens, which sequentially comprises a light incidence end and a light emergence end from the light incidence end to the light emergence end of the camera lens: a first lens; a second lens; a third lens; the surface of the fourth lens, which is close to the light incidence end, is concave; the surface of the fifth lens, which is close to the light incidence end, is convex, and the surface of the fifth lens, which is close to the light emergence end, is concave; a sixth lens element with negative refractive power; a seventh lens; the surface, close to the light emergent end, of the eighth lens is concave; the distance TTL from the surface of the first lens close to the light incidence end to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH <1.3 and ImgH >7.5 mm; the center thickness CT7 of the seventh lens on the optical axis, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 1.0. The invention solves the problem of poor imaging quality of the camera lens in the prior art.

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 vigorous development of portable electronic devices such as smart phones and tablet computers, unlike the single-shot or double-shot mobile phones, the existing high-end or flagship mobile phones usually use a plurality of lenses in a matched manner, including large image planes, ultra-wide angles, long focuses and the like, and the matching of the lenses with higher specifications greatly improves the imaging capability and competitive advantages of the mobile phone lenses. The large image plane lens is higher in resolution ratio, can be better compatible with a smart phone due to ultra-thinness, and meets the requirement of portability, and the traditional camera lens is difficult to meet the requirement.

That is to say, the imaging lens in the prior art has the problem of poor imaging quality.

Disclosure of Invention

The invention mainly aims to provide a camera lens to solve the problem of poor imaging quality of the camera lens in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an image pickup lens, comprising in order from a light incident end to a light exit end of the image pickup lens: a first lens; a second lens; a third lens; the surface of the fourth lens, which is close to the light incidence end, is concave; the surface of the fifth lens, which is close to the light incidence end, is convex, and the surface of the fifth lens, which is close to the light emergence end, is concave; a sixth lens element with negative refractive power; a seventh lens; the surface, close to the light emergent end, of the eighth lens is concave; the distance TTL from the surface of the first lens close to the light incidence end to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH <1.3 and ImgH >7.5 mm; the center thickness CT7 of the seventh lens on the optical axis, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 1.0.

Further, a combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and a combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy: -1.0< f1234/f5678<0.

Further, the combined focal length f12 of the first lens and the second lens and the combined focal length f67 of the sixth lens and the seventh lens satisfy: 0.5< f12/f67< 1.5.

Further, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: -2.0< f2/f3+ f8/f7< -1.0.

Further, the effective focal length f of the imaging lens, the effective focal length f1 of the first lens, and the effective focal length f6 of the sixth lens satisfy: 0.5< f/f1-f/f6< 1.5.

Further, a maximum value Vg of the dispersion coefficients of the glass lens in the imaging lens satisfies: vg > 70.0.

Further, a minimum value Vp of the dispersion coefficients of the plastic lens in the imaging lens satisfies: vp < 19.0.

Further, a maximum value Np of refractive indexes of the plastic lens in the image pickup lens and a maximum value Ng of refractive indexes of the glass lens in the image pickup lens satisfy: Np-Ng >0.

Furthermore, the minimum value Vamin in the dispersion coefficients of the front four lenses in the imaging lens and the minimum value Vbmin in the dispersion coefficients of the rear four lenses in the imaging lens satisfy: (Vamin + Vbmin)/2< 19.0.

Further, the radius of curvature R7 of the surface of the fourth lens near the light incidence end, the radius of curvature R8 of the surface of the fourth lens near the light emergence end, the radius of curvature R9 of the surface of the fifth lens near the light incidence end and the radius of curvature R10 of the surface of the fifth lens near the light emergence end satisfy: 0<1/(R8/R7+ R10/R9) < 2.0.

Further, the radius of curvature R1 of the surface of the first lens near the light incidence end, the radius of curvature R2 of the surface of the first lens near the light emergence end, the radius of curvature R3 of the surface of the second lens near the light incidence end and the radius of curvature R4 of the surface of the second lens near the light emergence end satisfy: 0.5< (R1+ R2)/(R3+ R4) < 1.5.

Further, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: 1.0< ET1/CT1+ ET2/CT2< 2.0.

Further, the axial distance SAG82 from the edge thickness ET8 of the eighth lens, the intersection point of the surface of the eighth lens close to the light ray exit end and the optical axis to the effective radius vertex of the surface of the eighth lens close to the light ray exit end satisfies the following conditions: -0.5< ET8/SAG82 <0.

Further, the center thickness CT6 of the sixth lens on the optical axis, the on-axis distance SAG62 from the intersection point of the surface of the sixth lens near the light exit end and the optical axis to the effective radius vertex of the surface of the sixth lens near the light exit end satisfy: -0.8< CT6/SAG62< -0.3.

Further, an on-axis distance SAG11 between an intersection point of the surface of the first lens near the light incident end and the optical axis to an effective radius vertex of the surface of the first lens near the light incident end and a maximum effective radius DT11 of the surface of the first lens near the light incident end satisfies: 0.2< SAG11/DT11< 0.7.

Further, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 0.2< ET4/(ET3+ ET5) < 0.7.

Further, the radius of curvature R11 of the surface of the sixth lens near the light incident end, the radius of curvature R12 of the surface of the sixth lens near the light exiting end, the radius of curvature R13 of the surface of the seventh lens near the light incident end, and the radius of curvature R14 of the surface of the seventh lens near the light exiting end satisfy: 0.5< R12/R11+ R13/R14< 2.0.

Further, the radius of curvature R5 of the surface of the third lens near the light incidence end and the radius of curvature R6 of the surface of the third lens near the light emergence end satisfy that: 0< R5/R6< 1.0.

Furthermore, the second lens element with negative refractive power has a convex surface near the light incident end and a concave surface near the light emergent end; the third lens has positive refractive power, the surface of the third lens, which is close to the light incidence end, is convex, and the surface of the third lens, which is close to the light emergence end, is concave; the surface of the sixth lens, which is close to the light incidence end, is convex, and the surface of the sixth lens, which is close to the light emergence end, is concave; the eighth lens element with negative refractive power has a concave surface near the light incident end and a concave surface near the light emergent end.

Further, at least one of the first lens to the eighth lens is a glass lens, and at least another one is a plastic lens having a refractive index of more than 1.60.

According to another aspect of the present invention, there is provided an image pickup lens, comprising in order from a light incident end to a light exit end of the image pickup lens: a first lens; a second lens; a third lens; the surface of the fourth lens, which is close to the light incidence end, is concave; the surface of the fifth lens, which is close to the light incidence end, is convex, and the surface of the fifth lens, which is close to the light emergence end, is concave; a sixth lens element with negative refractive power; a seventh lens; the surface, close to the light emergent end, of the eighth lens is concave; the distance TTL from the surface of the first lens close to the light incidence end to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH < 1.3; the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens and the eighth lens satisfy: -1.0< f1234/f5678< 0; the center thickness CT7 of the seventh lens on the optical axis, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 1.0.

By applying the technical scheme of the invention, the camera 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 a light incident end to a light emergent end, wherein the surface of the fourth lens, which is close to the light incident end, is concave; the surface of the fifth lens, which is close to the light incidence end, is convex, and the surface of the fifth lens, which is close to the light emergence end, is concave; the sixth lens element with negative refractive power; the surface of the eighth lens, which is close to the light ray emergent end, is concave; the distance TTL from the surface of the first lens close to the light incidence end to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH <1.3 and ImgH >7.5 mm; the center thickness CT7 of the seventh lens on the optical axis, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 1.0.

The surface of the fourth lens, which is close to the light incidence end, is concave, so that the camera lens can support a larger image plane, which means higher resolution and image quality; the surface of the fifth lens, which is close to the light emergent end, is concave, so that the camera lens can support a larger field angle, the camera lens has a wider imaging range, the collection capability of the camera lens on object information is improved, and meanwhile, the aberration of a marginal field of view is favorably reduced; by setting the sixth lens element to have negative refractive power, the camera lens can obtain higher relative brightness, imaging is clearer, reasonable distribution of the refractive power of the camera lens is facilitated, overall aberration is better corrected, and imaging quality is higher; through setting up the surface that is close to light outgoing end with the eighth lens to the concavity, make camera lens size overall arrangement more reasonable, realize higher space utilization, can adjust the exit angle of light simultaneously, increase with the matching nature of chip to promote the image quality, realize the efficiency of high resolving power. The TTL/ImgH is limited within a reasonable range, so that the camera lens can be thinned, the camera lens is better compatible with ultrathin electronic equipment, and the portability requirement of the camera lens is met; by controlling half of the diagonal length of the effective pixel area on the imaging surface, the camera lens has higher pixels and resolution ratio, and higher imaging quality is obtained; by restricting the range of CT7/T78, the field curvature contribution amount of the seventh lens is controlled, so that the field curvature balance of the whole imaging lens is in a reasonable range.

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

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

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

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

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

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

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

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

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

fig. 25 is a schematic diagram showing a configuration of an 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 imaging lens in fig. 25, respectively;

fig. 29 is a schematic view showing a configuration of an 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 imaging lens in fig. 29, respectively.

Wherein the figures include the following reference numerals:

STO, stop; e1, first lens; s1, the surface of the first lens close to the light incidence end; s2, the surface of the first lens close to the light ray exit end; e2, second lens; s3, the surface of the second lens close to the light incidence end; s4, the surface of the second lens close to the light ray exit end; e3, third lens; s5, the surface of the third lens close to the light incidence end; s6, the surface of the third lens close to the light ray exit end; e4, fourth lens; s7, the surface of the fourth lens close to the light incidence end; s8, the surface of the fourth lens close to the light ray exit end; e5, fifth lens; s9, the surface of the fifth lens close to the light incidence end; s10, the surface of the fifth lens close to the light ray exit end; e6, sixth lens; s11, the surface of the sixth lens close to the light incidence end; s12, the surface of the sixth lens close to the light ray exit end; e7, seventh lens; s13, the surface of the seventh lens close to the light incidence end; s14, the surface of the seventh lens close to the light ray exit end; e8, eighth lens; s15, the surface of the eighth lens close to the light incidence end; s16, the surface of the eighth lens close to the light ray exit end; e9, a filter plate; s17, the surface of the filter close to the optical incidence end; s18, the surface of the filter close to the optical emergent end; 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 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 position of the convex 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 position of the concave 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 surface of the lens close to the light incidence end, and the surface of each lens close to the image side is called the surface of the lens close to the light emergence end. 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. 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; the image side surface is determined to be concave when the R value is positive, and to be convex when the R value is negative.

The invention provides a camera lens, aiming at solving the problem of poor imaging quality of the camera lens in the prior art.

Example one

As shown in fig. 1 to 32, the image capturing lens includes, in order from a light incident end to a light emitting end, 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, wherein a surface of the fourth lens near the light incident end is concave; the surface of the fifth lens, which is close to the light incidence end, is convex, and the surface of the fifth lens, which is close to the light emergence end, is concave; the sixth lens element with negative refractive power; the surface of the eighth lens, which is close to the light ray emergent end, is concave; the distance TTL from the surface of the first lens close to the light incidence end to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH <1.3 and ImgH >7.5 mm; the center thickness CT7 of the seventh lens on the optical axis, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 1.0.

Preferably, the distance TTL between the surface of the first lens element near the light incident end and the imaging plane of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: 1.1< TTL/ImgH < 1.28. The center thickness CT7 of the seventh lens on the optical axis, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 0.9.

In the present embodiment, a combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and a combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy: -1.0< f1234/f5678<0. By controlling the ratio of the combined focal length of the first lens, the second lens, the third lens and the fourth lens to the combined focal length of the fifth lens, the sixth lens, the seventh lens and the eighth lens within a reasonable range, the positive and negative refractive powers of the lenses in the camera lens are reasonably distributed, so that the low-order aberration of the system can be effectively balanced, and the system has better imaging quality and processability. Preferably, -0.8< f1234/f5678< 0.3.

In the present embodiment, the combined focal length f12 of the first lens and the second lens, and the combined focal length f67 of the sixth lens and the seventh lens satisfy: 0.5< f12/f67< 1.5. By controlling the ratio of the combined focal length of the first lens and the second lens to the combined focal length of the sixth lens and the seventh lens, the camera lens is more reasonable in structural distribution and has good processability and use stability. Preferably 0.6< f12/f67< 1.3.

In the present embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: -2.0< f2/f3+ f8/f7< -1.0. By limiting f2/f3+ f8/f7 within a reasonable range, the size of the structure can be controlled favorably while the high aberration correction capability of the imaging lens is ensured, and excessive concentration of the refractive power of the optical transverse lens is avoided. Preferably, -1.8< f2/f3+ f8/f7< -1.1.

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 f6 of the sixth lens satisfy: 0.5< f/f1-f/f6< 1.5. By limiting f/f1-f/f6 within a reasonable range and reasonably distributing the refractive power of the first lens element and the sixth lens element, the amount of contribution of spherical aberration of the first lens element and the sixth lens element can be controlled within a reasonable range, so that the imaging lens system can obtain better imaging quality. Preferably 0.8< f/f1-f/f6< 1.4.

In the present embodiment, the maximum value Vg of the dispersion coefficients of the glass lens in the imaging lens satisfies: vg > 70.0. By restraining the maximum value in the dispersion coefficient of the glass lens in the camera lens, the dispersion of the glass lens is controlled to be small and is balanced with chromatic aberration generated by other lenses, so that the aberration of the camera lens is fully corrected, and better imaging quality is ensured. Preferably 72< Vg.

In the present embodiment, a minimum value Vp of the dispersion coefficients of the plastic lens in the imaging lens satisfies: vp < 19.0. The chromatic dispersion capability of the plastic lens is reasonably distributed by restricting the minimum value in the chromatic dispersion coefficient of the plastic lens in the camera lens, so that chromatic aberration generated by the plastic lens and the glass lens are mutually balanced, the chromatic aberration of the camera lens is fully corrected, and higher imaging quality is obtained. Preferably Vp < 18.5.

In the present embodiment, a maximum value Np of refractive indexes of a plastic lens in an imaging lens and a maximum value Ng of refractive indexes of a glass lens in the imaging lens satisfy: Np-Ng >0. The dispersion capacity of the camera lens is reasonably distributed by restricting the difference value between the maximum value in the refractive indexes of the plastic lens and the maximum value in the refractive index of the glass lens, and the axial chromatic aberration and the chromatic aberration of magnification are better corrected; meanwhile, the forming processing of the plastic lens and the glass lens is facilitated, and the production yield of the camera lens is improved. Preferably, Np-Ng > 0.1.

In the present embodiment, a minimum value Vamin of the dispersion coefficients of the front four lenses in the imaging lens and a minimum value Vbmin of the dispersion coefficients of the rear four lenses in the imaging lens satisfy: (Vamin + Vbmin)/2< 19.0. The ratio of the minimum value in the dispersion coefficients of the front four lenses to the minimum value in the dispersion coefficients of the rear four lenses is restricted within a reasonable range, so that the size layout of the camera lens is more reasonable, the processability and the use stability of the camera lens are facilitated, and meanwhile, the chromatic aberration of the camera lens is better corrected, and higher imaging quality is ensured. Preferably, (Vamin + Vbmin)/2< 18.9.

In the present embodiment, the radius of curvature R7 of the surface of the fourth lens near the light incident end, the radius of curvature R8 of the surface of the fourth lens near the light exiting end, the radius of curvature R9 of the surface of the fifth lens near the light incident end, and the radius of curvature R10 of the surface of the fifth lens near the light exiting end satisfy: 0<1/(R8/R7+ R10/R9) < 2.0. By limiting 1/(R8/R7+ R10/R9) within a reasonable range, the bending degrees of the fourth lens and the fifth lens are reasonably controlled, the injection molding of the fourth lens and the fifth lens is facilitated, and the processability of the camera lens is improved. Preferably, 0.1<1/(R8/R7+ R10/R9) < 1.8.

In the present embodiment, the radius of curvature R1 of the surface of the first lens near the light incident end, the radius of curvature R2 of the surface of the first lens near the light exiting end, the radius of curvature R3 of the surface of the second lens near the light incident end, and the radius of curvature R4 of the surface of the second lens near the light exiting end satisfy: 0.5< (R1+ R2)/(R3+ R4) < 1.5. By limiting (R1+ R2)/(R3+ R4) to a reasonable range, the degree of curvature of the first and second lenses is reasonably controlled, and it is possible to ensure that the first and second lenses have good processability. Preferably, 0.6< (R1+ R2)/(R3+ R4) < 1.3.

In the present embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the edge thickness ET1 of the first lens, and the edge thickness ET2 of the second lens satisfy: 1.0< ET1/CT1+ ET2/CT2< 2.0. By controlling the ET1/CT1+ ET2/CT2 within a reasonable range and reasonably controlling the ratio of the edge thickness to the center thickness of the first lens and the second lens, ghost images formed by the reflection of the first lens and the second lens can be avoided while good processability is ensured. Preferably, 1.3< ET1/CT1+ ET2/CT2< 1.9.

In the present embodiment, the axial distance SAG82 from the edge thickness ET8 of the eighth lens, the intersection point of the surface of the eighth lens near the light exit end and the optical axis, to the effective radius vertex of the surface of the eighth lens near the light exit end satisfies: -0.5< ET8/SAG82 <0. By controlling the ET8/SAG82 within a reasonable range, the shape of the eighth lens is effectively controlled, good processability is guaranteed, meanwhile, the light deflection angle is prevented from being too large, and the sensitivity of the camera lens is favorably reduced. Preferably, -0.48< ET8/SAG82< -0.1.

In the present embodiment, the center thickness CT6 of the sixth lens on the optical axis, the on-axis distance SAG62 from the intersection point of the surface of the sixth lens near the light exit end and the optical axis to the effective radius vertex of the surface of the sixth lens near the light exit end satisfy: -0.8< CT6/SAG62< -0.3. By controlling the CT6/SAG62 within a reasonable range, the bending degree of the sixth lens is effectively controlled, the injection molding of the sixth lens is facilitated, and the production yield is improved. Preferably, -0.7< CT6/SAG62< -0.4.

In the embodiment, the on-axis distance SAG11 between the intersection point of the surface of the first lens close to the light incidence end and the optical axis and the effective radius vertex of the surface of the first lens close to the light incidence end and the maximum effective radius DT11 of the surface of the first lens close to the light incidence end satisfy: 0.2< SAG11/DT11< 0.7. By controlling SAG11/DT11 within a reasonable range, the sensitivity of the first lens is reduced and the production yield of the first lens is improved while the first lens has good processability. Preferably, 0.3< SAG11/DT11< 0.6.

In the present embodiment, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, and the edge thickness ET5 of the fifth lens satisfy: 0.2< ET4/(ET3+ ET5) < 0.7. Through controlling ET4/(ET3+ ET5) in reasonable within range, can rationally control the edge thickness of third lens, fourth lens and fifth lens, make camera lens's structure more reasonable, improve the equipment yield, have better stability in use simultaneously. Preferably, 0.3< ET4/(ET3+ ET5) < 0.6.

In the present embodiment, the radius of curvature R11 of the surface of the sixth lens near the light incident end, the radius of curvature R12 of the surface of the sixth lens near the light exiting end, the radius of curvature R13 of the surface of the seventh lens near the light incident end, and the radius of curvature R14 of the surface of the seventh lens near the light exiting end satisfy: 0.5< R12/R11+ R13/R14< 2.0. By controlling R12/R11+ R13/R14 within a reasonable range and reasonably controlling the shapes of the sixth lens and the seventh lens, the on-axis aberration generated by the camera lens can be effectively balanced while good processability is ensured. Preferably 0.6< R12/R11+ R13/R14< 1.8.

In the present embodiment, the radius of curvature R5 of the surface of the third lens near the light incident end and the radius of curvature R6 of the surface of the third lens near the light exiting end satisfy: 0< R5/R6< 1.0. By controlling R5/R6 within a reasonable range, the shape of the third lens can be effectively constrained, the injection molding of the third lens is facilitated, and the sensitivity of the third lens is reduced. Preferably 0.1< R5/R6< 0.8.

In this embodiment, the second lens element with negative refractive power has a convex surface near the light incident end and a concave surface near the light emitting end; the third lens has positive refractive power, the surface of the third lens, which is close to the light incidence end, is convex, and the surface of the third lens, which is close to the light emergence end, is concave; the surface of the sixth lens, which is close to the light incidence end, is convex, and the surface of the sixth lens, which is close to the light emergence end, is concave; the eighth lens element with negative refractive power has a concave surface near the light incident end and a concave surface near the light emergent end. The second lens and the eighth lens are set to have negative refractive power, so that an image surface supported by the camera lens is larger, namely a higher imaging surface can be obtained at the same field angle, and meanwhile, the improvement of the relative brightness of the camera lens is facilitated, and the image surface definition is improved; by setting the third lens element to have positive refractive power, light rays can be better converged on the image side surface while the camera lens supports a larger field angle; the surface of the sixth lens, which is close to the light incidence end, is set to be convex, and the surface of the sixth lens, which is close to the light emergence end, is set to be concave, so that the aberration of the marginal field of view can be effectively reduced while the light flux is increased, the reasonable distribution of the refractive power of the whole camera lens is facilitated, and the imaging quality is improved.

In this embodiment, at least one of the first lens to the eighth lens is a glass lens, and at least another one of the first lens to the eighth lens is a plastic lens having a refractive index of more than 1.60. By using at least one glass lens and at least one plastic lens with the refractive index larger than 1.60, on the premise of controlling the cost, the chromatic aberration of the camera lens is favorably and better balanced, and the aberration of the camera lens is corrected, so that the imaging quality of the camera lens is improved.

Example two

As shown in fig. 1 to 32, the light incident end to the light exiting end of the camera lens sequentially includes: a first lens; a second lens; a third lens; a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the surface of the fourth lens, which is close to the light incidence end, is concave; the surface of the fifth lens, which is close to the light incidence end, is convex, and the surface of the fifth lens, which is close to the light emergence end, is concave; the sixth lens element with negative refractive power; the surface of the eighth lens, which is close to the light ray emergent end, is concave; the distance TTL from the surface of the first lens close to the light incidence end to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH < 1.3; the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens and the eighth lens satisfy: -1.0< f1234/f5678< 0; the center thickness CT7 of the seventh lens on the optical axis, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 1.0.

The surface of the fourth lens, which is close to the light incidence end, is concave, so that the camera lens can support a larger image plane, which means higher resolution and image quality; the surface of the fifth lens, which is close to the light emergent end, is concave, so that the camera lens can support a larger field angle, the camera lens has a wider imaging range, the collection capability of the camera lens on object information is improved, and meanwhile, the aberration of a marginal field of view is favorably reduced; by setting the sixth lens element to have negative refractive power, the camera lens can obtain higher relative brightness, imaging is clearer, reasonable distribution of the refractive power of the camera lens is facilitated, overall aberration is better corrected, and imaging quality is higher; through setting up the surface that is close to light outgoing end with the eighth lens to the concavity, make camera lens size overall arrangement more reasonable, realize higher space utilization, can adjust the exit angle of light simultaneously, increase with the matching nature of chip to promote the image quality, realize the efficiency of high resolving power. By limiting TTL/ImgH within a reasonable range, the ultra-thin camera lens can be realized, so that the camera lens is better compatible with ultra-thin electronic equipment, and the portability requirement of the camera lens is met. (ii) a By controlling the ratio of the combined focal length of the first lens, the second lens, the third lens and the fourth lens to the combined focal length of the fifth lens, the sixth lens, the seventh lens and the eighth lens within a reasonable range, the positive and negative refractive powers of the lenses in the camera lens are reasonably distributed, so that the low-order aberration of the system can be effectively balanced, and the system has better imaging quality and processability. By restricting the range of CT7/T78, the field curvature contribution amount of the seventh lens is controlled, so that the field curvature balance of the whole imaging lens is in a reasonable range.

Preferably, the distance TTL between the surface of the first lens element near the light incident end and the imaging plane of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: 1.1< TTL/ImgH < 1.28. The center thickness CT7 of the seventh lens on the optical axis, and the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 0.9. The combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens and the eighth lens satisfy: -0.8< f1234/f5678< 0.3.

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

The imaging lens in the present application may employ a plurality of lenses, for example, the above-described eight lenses. By reasonably distributing the refractive power, the surface shape, 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 eight lenses are exemplified in the embodiment, the imaging lens is not limited to including eight lenses. The camera lens may also include other numbers of lenses, as desired.

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

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

Example one

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

As shown in fig. 1, the camera lens sequentially includes, from the light incident end to the light emitting end: 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 eighth lens E8, a filter E9, and an image plane S19.

The first lens element E1 with positive refractive power has a convex surface S1 near the light incident end and a concave surface S2 near the light exiting end. The second lens element E2 with negative refractive power has a convex surface S3 near the light incident end and a concave surface S4 near the light exiting end. The third lens element E3 with positive refractive power has a convex surface S5 near the light incident end and a concave surface S6 near the light exiting end. The fourth lens element E4 with positive refractive power has a concave surface S7 at the light incident end and a convex surface S8 at the light emergent end. The fifth lens element E5 with negative refractive power has a convex surface S9 near the light incident end and a concave surface S10 near the light exiting end. The sixth lens element E6 with negative refractive power has a convex surface S11 near the light incident end and a concave surface S12 near the light exiting end. The seventh lens element E7 with positive refractive power has a convex surface S13 near the light incident end and a concave surface S14 near the light exiting end. The eighth lens element E8 with negative refractive power has a concave surface S15 near the light incident end and a concave surface S16 near the light exiting end. The filter E9 has a surface S17 of the filter near the optical incident end and a surface S18 of the filter near the optical exit end. 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 camera lens is 8.65mm, the total length TTL of the camera lens is 9.71mm and the image height ImgH is 8.17 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 surface and the image-side surface of any one of the first lens E1 to the eighth lens E8 near the light incident end 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-S16 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.

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

Example two

As shown in fig. 5 to 8, an imaging lens of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 5 shows a schematic diagram of the imaging lens structure of example two.

As shown in fig. 5, the camera lens sequentially includes, from the light incident end to the light emitting end: 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 eighth lens E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the camera lens is 8.68mm, the total length TTL of the camera lens is 9.8mm and the image height ImgH is 8.17 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. 6 shows an axial chromatic aberration curve of the imaging lens of example two, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 7 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example two. Fig. 8 shows distortion curves of the imaging lens of example two, which show values of distortion magnitudes corresponding to different angles of view.

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

Example III

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

As shown in fig. 9, the camera lens sequentially includes, from the light incident end to the light emitting end: 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 eighth lens E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the camera lens is 8.34mm, the total length TTL of the camera lens is 9.86mm and the image height ImgH is 8.17 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-8.5263E-05

2.1167E-04

-2.7138E-04

1.9596E-04

-9.4188E-05

2.9130E-05

-5.7659E-06

S2

-2.7240E-03

2.7605E-03

-2.6907E-03

1.7660E-03

-7.7111E-04

2.2019E-04

-3.8871E-05

S3

-6.5656E-03

4.5747E-03

-3.9719E-03

3.5462E-03

-2.4690E-03

1.2789E-03

-4.6513E-04

S4

-3.2834E-03

-2.1919E-03

1.4065E-02

-2.7819E-02

3.4381E-02

-2.8505E-02

1.6373E-02

S5

-4.7958E-03

2.7102E-04

-1.0777E-03

3.0733E-03

-5.1904E-03

5.7063E-03

-4.1926E-03

S6

-4.2960E-03

-2.5988E-04

-1.1171E-03

4.3540E-03

-7.9476E-03

8.9419E-03

-6.6232E-03

S7

-9.3131E-03

4.4678E-03

-2.0754E-02

4.3125E-02

-5.9230E-02

5.6358E-02

-3.8219E-02

S8

-6.0598E-03

-6.7354E-03

1.3850E-02

-2.4174E-02

2.8449E-02

-2.3132E-02

1.3279E-02

S9

-1.1490E-02

-1.8269E-04

-1.4897E-03

2.2983E-03

-1.6847E-03

7.6435E-04

-2.3734E-04

S10

-1.0639E-02

8.1533E-04

-1.8141E-03

2.0413E-03

-1.2167E-03

4.5151E-04

-1.1154E-04

S11

-1.0995E-02

7.5246E-04

1.3046E-03

-1.2478E-03

5.8351E-04

-1.7498E-04

3.5732E-05

S12

-2.7915E-02

5.3932E-04

5.5383E-03

-4.4944E-03

2.0714E-03

-6.3595E-04

1.3532E-04

S13

-1.4948E-02

-1.4026E-03

2.2631E-03

-1.1093E-03

3.1912E-04

-5.9877E-05

7.5863E-06

S14

6.3296E-03

-3.1689E-03

1.0396E-03

-2.8891E-04

5.7094E-05

-7.7275E-06

7.1087E-07

S15

-4.6150E-02

1.2157E-02

-2.4998E-03

3.9356E-04

-4.5604E-05

3.8140E-06

-2.2706E-07

S16

-5.0301E-02

1.3630E-02

-2.9861E-03

4.7993E-04

-5.5110E-05

4.4697E-06

-2.5490E-07

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.7456E-07

-3.7924E-08

1.1595E-10

4.9373E-11

0.0000E+00

S2

3.8069E-06

-1.5780E-07

0.0000E+00

S3

1.1061E-04

-1.4402E-05

1.6606E-07

2.4373E-07

-3.3134E-08

1.4466E-09

0.0000E+00

S4

-6.5911E-03

1.8518E-03

-3.5510E-04

4.4206E-05

-3.2126E-06

1.0315E-07

0.0000E+00

S5

2.1079E-03

-7.2778E-04

1.6972E-04

-2.5541E-05

2.2383E-06

-8.6721E-08

0.0000E+00

S6

3.3375E-03

-1.1519E-03

2.6809E-04

-4.0204E-05

3.5050E-06

-1.3478E-07

0.0000E+00

S7

1.8740E-02

-6.6619E-03

1.7008E-03

-3.0399E-04

3.6123E-05

-2.5645E-06

8.2347E-08

S8

-5.4530E-03

1.6074E-03

-3.3717E-04

4.9096E-05

-4.7141E-06

2.6826E-07

-6.8482E-09

S9

5.2831E-05

-8.5106E-06

9.7115E-07

-7.4398E-08

3.4262E-09

-7.1459E-11

0.0000E+00

S10

1.8766E-05

-2.1315E-06

1.5642E-07

-6.6843E-09

1.2600E-10

0.0000E+00

S11

-5.0808E-06

4.9987E-07

-3.2584E-08

1.2671E-09

-2.2235E-11

0.0000E+00

S12

-2.0104E-05

2.0536E-06

-1.3779E-07

5.4258E-09

-8.1994E-11

-1.6839E-12

6.0892E-14

S13

-6.5761E-07

3.8909E-08

-1.5352E-09

3.8028E-11

-5.0645E-13

1.8022E-15

2.0488E-17

S14

-4.4401E-08

1.8707E-09

-5.1848E-11

8.8510E-13

-7.7346E-15

9.3689E-18

2.4368E-19

S15

9.5022E-09

-2.7416E-10

5.2359E-12

-6.0118E-14

3.0033E-16

8.8335E-19

-1.2663E-20

S16

1.0168E-08

-2.7964E-10

5.1213E-12

-5.7638E-14

3.1668E-16

7.7607E-20

-6.7133E-21

TABLE 6

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

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

Example four

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

As shown in fig. 13, the camera lens sequentially includes, from the light incident end to the light exiting end: 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 eighth lens E8, a filter E9, and an image plane S19.

The first lens element E1 with positive refractive power has a convex surface S1 near the light incident end and a concave surface S2 near the light exiting end. The second lens element E2 with negative refractive power has a convex surface S3 near the light incident end and a concave surface S4 near the light exiting end. The third lens element E3 with positive refractive power has a convex surface S5 near the light incident end and a concave surface S6 near the light exiting end. The fourth lens element E4 with negative refractive power has a concave surface S7 near the light incident end and a convex surface S8 near the light exiting end. The fifth lens element E5 with negative refractive power has a convex surface S9 near the light incident end and a concave surface S10 near the light exiting end. The sixth lens element E6 with negative refractive power has a convex surface S11 near the light incident end and a concave surface S12 near the light exiting end. The seventh lens element E7 with positive refractive power has a convex surface S13 near the light incident end and a concave surface S14 near the light exiting end. The eighth lens element E8 with negative refractive power has a concave surface S15 near the light incident end and a concave surface S16 near the light exiting end. The filter E9 has a surface S17 of the filter near the optical incident end and a surface S18 of the filter near the optical exit end. 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 camera lens is 9.34mm, the total length TTL of the camera lens is 10.33mm and the image height ImgH is 8.17 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.4380E-05

7.5858E-05

-7.2987E-05

5.0819E-06

1.2076E-05

-6.6077E-06

1.5080E-06

S2

1.0767E-03

1.0268E-03

-2.5061E-03

2.0533E-03

-1.0423E-03

3.3545E-04

-6.4406E-05

S3

-1.9442E-03

1.7707E-03

-7.6068E-04

-3.8643E-04

9.8041E-04

-7.5861E-04

3.2205E-04

S4

-4.2735E-03

8.2122E-04

6.3318E-03

-1.4882E-02

2.0885E-02

-1.9349E-02

1.2305E-02

S5

-8.0572E-03

2.1039E-03

-4.2210E-03

8.9154E-03

-1.2442E-02

1.2029E-02

-8.1404E-03

S6

-5.9355E-03

1.4784E-04

2.2825E-03

-8.2107E-03

1.5452E-02

-1.7756E-02

1.3514E-02

S7

-1.1820E-02

-2.0455E-03

3.9458E-03

-1.0936E-02

1.9400E-02

-2.3276E-02

1.9481E-02

S8

-1.1527E-02

-9.0874E-04

3.2405E-03

-9.2972E-03

1.3917E-02

-1.3190E-02

8.5059E-03

S9

-1.4387E-02

4.4166E-03

-3.7857E-03

1.6052E-03

5.7374E-05

-4.5207E-04

2.6387E-04

S10

-1.3680E-02

4.4614E-03

-2.9832E-03

1.0607E-03

1.5407E-05

-1.9499E-04

9.6388E-05

S11

-1.0771E-02

3.3511E-03

-2.6495E-03

2.6778E-03

-2.0466E-03

9.7959E-04

-3.0321E-04

S12

-2.4609E-02

8.4122E-05

5.1712E-03

-3.2405E-03

1.0484E-03

-2.1131E-04

2.8253E-05

S13

-1.3321E-02

-1.0456E-02

7.6960E-03

-2.8629E-03

6.6445E-04

-1.0328E-04

1.1043E-05

S14

1.0453E-02

-1.5230E-02

7.1908E-03

-2.0993E-03

4.0598E-04

-5.4053E-05

5.0380E-06

S15

-5.2770E-03

-3.9584E-03

1.2671E-03

-1.1750E-04

-1.0197E-05

3.6777E-06

-4.2541E-07

S16

-9.1160E-03

-8.6542E-04

2.7726E-04

-1.3097E-05

-3.8460E-06

7.7128E-07

-6.9736E-08

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-1.7836E-07

1.0663E-08

-5.4613E-10

3.2135E-11

0.0000E+00

S2

6.6598E-06

-2.8475E-07

0.0000E+00

S3

-7.7110E-05

8.1440E-06

5.8731E-07

-2.8572E-07

3.3036E-08

-1.3854E-09

0.0000E+00

S4

-5.4552E-03

1.6840E-03

-3.5485E-04

4.8654E-05

-3.9122E-06

1.3992E-07

0.0000E+00

S5

3.8726E-03

-1.2852E-03

2.9061E-04

-4.2566E-05

3.6212E-06

-1.3264E-07

-4.1975E-10

S6

-7.0354E-03

2.5223E-03

-6.1294E-04

9.6485E-05

-8.8804E-06

3.6305E-07

0.0000E+00

S7

-1.1576E-02

4.9069E-03

-1.4717E-03

3.0469E-04

-4.1367E-05

3.3106E-06

-1.1825E-07

S8

-3.8555E-03

1.2427E-03

-2.8347E-04

4.4723E-05

-4.6408E-06

2.8484E-07

-7.8305E-09

S9

-8.4659E-05

1.7352E-05

-2.3339E-06

2.0021E-07

-9.9558E-09

2.1867E-10

0.0000E+00

S10

-2.6032E-05

4.4857E-06

-5.0600E-07

3.6168E-08

-1.4706E-09

2.4227E-11

1.0667E-13

S11

6.2578E-05

-8.6721E-06

7.8852E-07

-4.3632E-08

1.1613E-09

2.6877E-12

-6.3224E-13

S12

-2.6174E-06

1.7825E-07

-9.6087E-09

4.2091E-10

-1.3868E-11

2.9884E-13

-3.3208E-15

S13

-8.1547E-07

4.1106E-08

-1.3778E-09

2.9673E-11

-4.1263E-13

4.4575E-15

-3.8706E-17

S14

-3.2930E-07

1.4921E-08

-4.5420E-10

8.6496E-12

-8.5302E-14

1.1793E-16

3.4991E-18

S15

2.8158E-08

-1.1789E-09

3.1572E-11

-5.1402E-13

4.2671E-15

-5.3473E-18

-1.1363E-19

S16

3.7970E-09

-1.3316E-10

3.0182E-12

-4.2109E-14

3.1068E-16

-5.7789E-19

-4.0799E-21

TABLE 8

Fig. 14 shows an on-axis chromatic aberration curve of the imaging lens of example four, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens. Fig. 15 shows astigmatism curves of the imaging lens of example four, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows distortion curves of the imaging lens of example four, which show distortion magnitude values corresponding to different angles of view.

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

Example five

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

As shown in fig. 17, the camera lens sequentially includes, from the light incident end to the light exiting end: 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 eighth lens E8, a filter E9, and an image plane S19.

The first lens element E1 with positive refractive power has a convex surface S1 near the light incident end and a concave surface S2 near the light exiting end. The second lens element E2 with negative refractive power has a convex surface S3 near the light incident end and a concave surface S4 near the light exiting end. The third lens element E3 with positive refractive power has a convex surface S5 near the light incident end and a concave surface S6 near the light exiting end. The fourth lens element E4 with negative refractive power has a concave surface S7 near the light incident end and a convex surface S8 near the light exiting end. The fifth lens element E5 with positive refractive power has a convex surface S9 at the light incident end and a concave surface S10 at the light emergent end. The sixth lens element E6 with negative refractive power has a convex surface S11 near the light incident end and a concave surface S12 near the light exiting end. The seventh lens element E7 with positive refractive power has a convex surface S13 near the light incident end and a concave surface S14 near the light exiting end. The eighth lens element E8 with negative refractive power has a concave surface S15 near the light incident end and a concave surface S16 near the light exiting end. The filter E9 has a surface S17 of the filter near the optical incident end and a surface S18 of the filter near the optical exit end. 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 camera lens is 8.64mm, the total length TTL of the camera lens is 9.50mm and the image height ImgH is 8.17 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 one above.

Watch 10

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

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

Example six

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

As shown in fig. 21, the camera lens sequentially includes, from the light incident end to the light emitting end: 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 eighth lens E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the camera lens is 8.55mm, the total length TTL of the camera lens is 9.53mm and the image height ImgH is 8.17 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. 22 shows an on-axis chromatic aberration curve of the imaging lens of example six, which indicates that light rays of different wavelengths are out of focus after passing through the imaging lens. Fig. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example six. Fig. 24 shows distortion curves of the imaging lens of example six, which show distortion magnitude values corresponding to different angles of view.

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

Example seven

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

As shown in fig. 25, the camera lens sequentially includes, from the light incident end to the light exiting end: 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 eighth lens E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the camera lens is 8.94mm, the total length TTL of the camera lens is 9.90mm and the image height ImgH is 8.17 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. 26 shows an on-axis chromatic aberration curve of the imaging lens of example seven, which shows the deviation of the convergent focal points of light rays of different wavelengths after passing through the imaging lens. Fig. 27 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example seven. Fig. 28 shows distortion curves of the imaging lens of example seven, which show distortion magnitude values corresponding to different angles of view.

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

Example eight

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

As shown in fig. 29, the camera lens sequentially includes, from the light incident end to the light exiting end: 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 eighth lens E8, a filter E9, and an image plane S19.

In this example, the total effective focal length f of the camera lens is 8.99mm, the total length TTL of the camera lens is 9.98mm and the image height ImgH is 8.17 mm.

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

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 imaging lens of example eight, which indicates that light rays of different wavelengths are out of focus after passing through the imaging lens. Fig. 31 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of example eight. Fig. 32 shows distortion curves of the imaging lens of example eight, which show distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 30 to 32, the 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 imaging lenses of examples one to eight, and effective focal lengths f1 to f8 of the respective lenses.

Example parameters	1	2	3	4	5	6	7	8
									f1(mm)	9.09	9.20	9.46	9.28	8.21	8.16	9.17	9.33
f2(mm)	-26.24	-27.43	-32.39	-26.26	-37.22	-36.92	-29.75	-28.45
									f3(mm)	34.92	35.02	40.42	30.98	54.04	54.24	34.30	34.13
f4(mm)	82.70	88.56	88.72	-650.73	-50.86	-48.07	424.69	130.12
									f5(mm)	-60.52	-51.38	-41.55	-61.22	2134.28	-553.88	-48.51	-47.20
f6(mm)	-99.29	-94.50	-65.53	-638.46	-41.96	-85.28	-82.85	-150.61
									f7(mm)	11.85	11.29	9.51	15.03	11.12	12.30	11.15	12.37
f8(mm)	-6.53	-6.77	-6.51	-7.97	-6.52	-6.89	-7.13	-7.05
									f(mm)	8.65	8.68	8.34	9.34	8.64	8.55	8.94	8.99
TTL(mm)	9.71	9.80	9.86	10.33	9.50	9.53	9.90	9.98
									ImgH(mm)	8.17	8.17	8.17	8.17	8.17	8.17	8.17	8.17
Semi-FOV(°)	42.7	42.6	43.7	40.5	42.8	43.0	41.7	41.5
									f/EPD	1.84	1.85	1.74	2.00	2.00	2.00	1.90	1.92

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 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. A camera lens, characterized in that, from a light incident end to a light exit end of the camera lens, sequentially comprises:

a first lens;

a second lens;

a third lens;

the surface of the fourth lens, which is close to the light incidence end, is concave;

the surface of the fifth lens, which is close to the light incidence end, is convex, and the surface of the fifth lens, which is close to the light emergence end, is concave;

a sixth lens element with negative refractive power;

a seventh lens;

the surface, close to the light ray exit end, of the eighth lens is concave;

the distance TTL from the surface of the first lens close to the light incidence end to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy the following conditions: TTL/ImgH <1.3 and ImgH >7.5 mm;

a center thickness CT7 of the seventh lens on the optical axis, an air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy: 0.5< CT7/T78< 1.0.

2. The imaging lens according to claim 1, wherein a combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and a combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy: -1.0< f1234/f5678<0.

3. The imaging lens according to claim 1, wherein a combined focal length f12 of the first lens and the second lens, and a combined focal length f67 of the sixth lens and the seventh lens satisfy: 0.5< f12/f67< 1.5.

4. The imaging lens according to claim 1, wherein an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, an effective focal length f7 of the seventh lens, and an effective focal length f8 of the eighth lens satisfy: -2.0< f2/f3+ f8/f7< -1.0.

5. The imaging lens of claim 1, wherein an effective focal length f of the imaging lens, an effective focal length f1 of the first lens, and an effective focal length f6 of the sixth lens satisfy: 0.5< f/f1-f/f6< 1.5.

6. The imaging lens according to claim 1, wherein a maximum value Vg of the dispersion coefficients of the glass lenses in the imaging lens satisfies: vg > 70.0.

7. The imaging lens of claim 1, wherein a minimum value Vp of the abbe numbers of the plastic lenses in the imaging lens satisfies: vp < 19.0.

8. The imaging lens according to claim 1, wherein a maximum value Np of refractive indices of plastic lenses in the imaging lens and a maximum value Ng of refractive indices of glass lenses in the imaging lens satisfy: Np-Ng >0.

9. The imaging lens according to claim 1, wherein a minimum value Vamin of the abbe numbers of the front four lenses in the imaging lens and a minimum value Vbmin of the abbe numbers of the rear four lenses in the imaging lens satisfy: (Vamin + Vbmin)/2< 19.0.

10. A camera lens, characterized in that, from a light incident end to a light exit end of the camera lens, sequentially comprises:

a first lens;

a second lens;

a third lens;

a sixth lens element with negative refractive power;

a seventh lens;

the surface, close to the light ray exit end, of the eighth lens is concave;

the distance TTL from the surface of the first lens close to the light incidence end to the imaging surface of the camera lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy the following conditions: TTL/ImgH < 1.3;

a combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and a combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy: -1.0< f1234/f5678< 0;