CN217181308U

CN217181308U - Optical imaging lens

Info

Publication number: CN217181308U
Application number: CN202122746088.XU
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: 2022-08-12
Anticipated expiration: 2031-11-10

Abstract

The utility model provides an optical imaging lens includes in order by optical imaging lens's thing side to image side: a first lens; a second lens; a third lens; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; a sixth lens having a negative focal power; a seventh lens; an eighth lens element, an image-side surface of which is concave; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging 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 maximum field angle FOV of the optical imaging lens and the effective focal length f of the optical imaging lens meet the following conditions: f tan (FOV/2>7.5 mm; the central thickness CT7 of the seventh lens on the optical axis, the air interval T78 of the seventh lens and the eighth lens on the optical axis satisfy that 0.5< CT7/T78< 1.0.

Description

Optical imaging lens

Technical Field

The utility model relates to an optical imaging equipment technical field particularly, relates to an optical imaging camera lens.

Background

With the vigorous development of portable electronic devices such as smart phones and tablet computers, the portable electronic devices become an indispensable part of the life of people; from code scanning payment to scenes such as portrait photography, the mobile phone lens bears more and more use requirements of people, so that the requirements on specifications such as the height and the light entering amount of the lens are higher and higher while the rapid development of the mobile phone lens market is promoted, the optical design and the processing and manufacturing of the mobile phone lens are more and more challenged, and the traditional optical imaging lens is difficult to meet the requirements.

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

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an optical imaging lens, which solves the problem of poor imaging quality of the optical imaging lens in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens including, in order from an object side to an image side of the optical imaging lens: a first lens; a second lens; a third lens; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; a sixth lens having a negative focal power; a seventh lens; an eighth lens element, an image-side surface of which is concave; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging 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 maximum field angle FOV of the optical imaging lens and the effective focal length f of the optical imaging lens meet the following conditions: f tan (FOV/2>7.5 mm; the central thickness CT7 of the seventh lens on the optical axis, and the air space 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 f12 of the first lens and the second lens satisfy: 0.5< f1234/f12< 1.5.

Further, a combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens, and the eighth lens, and a combined focal length f67 of the sixth lens and the seventh lens satisfy: -1.5< f67/f5678< -0.5.

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

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

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

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

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

Further, a curvature radius R7 of the object-side surface of the fourth lens, a curvature radius R8 of the image-side surface of the fourth lens, a curvature radius R9 of the object-side surface of the fifth lens, and a curvature radius R10 of the image-side surface of the fifth lens satisfy: 0<1/(R8/R7+ R10/R9) < 2.0.

Further, 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: 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 image-side surface of the eighth lens and the optical axis to the effective radius vertex of the image-side surface of the eighth lens satisfies the following conditions: -0.5< ET8/SAG82< 0.

Further, the center thickness CT6 of the sixth lens on the optical axis, and the on-axis distance SAG62 between the intersection point of the image-side surface of the sixth lens and the optical axis and the effective radius vertex of the image-side surface of the sixth lens satisfy: -0.8< CT6/SAG62< -0.3.

Further, an on-axis distance SAG11 between an intersection point of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens and a maximum effective radius DT11 of the object-side surface of the first lens satisfy: 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, a curvature radius R11 of an object-side surface of the sixth lens, a curvature radius R12 of an image-side surface of the sixth lens, a curvature radius R13 of an object-side surface of the seventh lens, and a curvature radius R14 of an image-side surface of the seventh lens satisfy: 0< R13/R12+ R14/R11< 1.0.

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

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

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 optical imaging lens, comprising, in order from an object side to an image side of the optical imaging lens: a first lens; a second lens; a third lens; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; a sixth lens having a negative focal power; a seventh lens; an eighth lens element, an image-side surface of which is concave; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging 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; the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f12 of the first lens and the second lens satisfy that: 0.5< f1234/f12< 1.5; 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.

Use the technical scheme of the utility model, include in order by the object side of optical imaging lens to image side: a first lens; a second lens; a third lens; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; a sixth lens having a negative focal power; a seventh lens; an eighth lens element, an image-side surface of which is concave; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging 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 maximum field angle FOV of the optical imaging lens and the effective focal length f of the optical imaging lens meet the following conditions: f tan (FOV/2) >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 optical imaging lens can support a larger image plane by setting the object side surface of the fourth lens to be a concave surface, which means higher resolution and image quality; the concave surface of the image side surface of the fifth lens enables the optical imaging lens to support a larger field angle, so that the optical imaging lens has a wider imaging range, the collection capability of the optical imaging lens on object information is improved, and meanwhile, the aberration of the marginal field of view is favorably reduced; the sixth lens is set to have negative focal power, so that the optical imaging lens can obtain higher relative brightness, the imaging is clearer, meanwhile, the reasonable distribution of the focal power of the optical imaging lens is facilitated, the integral aberration is better corrected, and the imaging quality is higher; the image side face of the eighth lens is set to be the concave face, so that the size layout of the optical imaging lens is more reasonable, the higher space utilization rate is realized, the emergent angle of light can be adjusted, and the matching performance with a chip is increased, so that the image quality is improved, and the effect of high resolving power is realized. By limiting TTL/ImgH within a reasonable range, the optical imaging lens can be ultrathin, so that the optical imaging lens is better compatible with ultrathin electronic equipment, and the portability requirement of the optical imaging lens is met; f, tan (FOV/2) is limited within a reasonable range, the relation between the focal length and the field angle of the optical imaging lens can be reasonably controlled, a large image plane is realized, and the optical imaging lens has higher pixels and resolution; by restricting the range of CT7/T78, the field curvature contribution amount of the seventh lens is controlled, so that the overall field curvature of the optical imaging lens is balanced in a reasonable range.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 structural diagram of 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 structural view 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 of an optical 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 optical imaging lens in fig. 9, respectively;

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

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

Fig. 17 is a schematic structural view of an optical imaging lens according to a fifth example 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 of an optical imaging lens according to a sixth example 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 of an optical imaging lens according to a seventh example of the present invention;

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

fig. 29 is a schematic structural view of 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:

STO, stop; e1, first lens; s1, the object side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; e6, 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, a filter plate; s17, the object side surface of the filter plate; s18, the image side surface of the filter plate; 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 accompanying drawings in conjunction with embodiments.

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 application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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

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

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

In order to solve the problem that optical imaging lens has the image quality difference among the prior art, the utility model provides an optical imaging lens.

Example one

As shown in fig. 1 to 32, the optical imaging lens sequentially includes, from an object side to an image side: a first lens; a second lens; a third lens; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; a sixth lens having a negative focal power; a seventh lens; an eighth lens element, an image-side surface of which is concave; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging 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 maximum field angle FOV of the optical imaging lens and the effective focal length f of the optical imaging lens meet the following conditions: f tan (FOV/2) >7.5 mm; the central 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 object side surface of the fourth lens is set to be a concave surface, so that the optical imaging lens can support a larger image surface, which means higher resolution and image quality; the concave surface of the image side surface of the fifth lens enables the optical imaging lens to support a larger field angle, so that the optical imaging lens has a wider imaging range, the collection capability of the optical imaging lens on object information is improved, and meanwhile, the aberration of the marginal field of view is favorably reduced; the sixth lens is set to have negative focal power, so that the optical imaging lens can obtain higher relative brightness, the imaging is clearer, meanwhile, the reasonable distribution of the focal power of the optical imaging lens is facilitated, the integral aberration is better corrected, and the imaging quality is higher; the image side face of the eighth lens is set to be the concave face, so that the size layout of the optical imaging lens is more reasonable, the higher space utilization rate is realized, the emergent angle of light can be adjusted, and the matching performance with a chip is increased, so that the image quality is improved, and the effect of high resolving power is realized. By limiting TTL/ImgH within a reasonable range, the optical imaging lens can be ultrathin, so that the optical imaging lens is better compatible with ultrathin electronic equipment, and the portability requirement of the optical imaging lens is met; f, tan (FOV/2) is limited within a reasonable range, the relation between the focal length and the field angle of the optical imaging lens can be reasonably controlled, a large image plane is realized, and the optical imaging lens has higher pixels and resolution; by restricting the range of CT7/T78, the field curvature contribution amount of the seventh lens is controlled, so that the overall field curvature of the optical imaging lens is balanced in a reasonable range.

Preferably, the distance TTL between the object-side surface of the first lens element and the imaging surface of the optical imaging lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: 1.1< TTL/ImgH < 1.28. The maximum field angle FOV of the optical imaging lens and the effective focal length f of the optical imaging lens meet the following conditions: f tan (FOV/2) >7.8 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< 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 f12 of the first lens and the second lens satisfy: 0.5< f1234/f12< 1.5. By limiting f1234/f12 within a reasonable range, the object side end of the optical imaging lens can have enough light convergence capacity to adjust the focusing position of the light beam, so that the total length of the optical imaging lens is shortened, and the requirement of ultra-thinness is met; and meanwhile, the combined focal length of the first lens, the second lens, the third lens and the fourth lens is controlled, so that the aberration generated by the front four lenses and the aberration generated by the rear four lenses of the optical imaging lens are balanced, better imaging quality is obtained, and the effect of high resolving power is realized. Preferably 0.6< f1234/f12< 1.2.

In the present embodiment, a combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens, and the eighth lens, and a combined focal length f67 of the sixth lens and the seventh lens satisfy: -1.5< f67/f5678< -0.5. By controlling f12/f67 within a reasonable range, the excessive deflection angle of light rays passing through the fifth lens, the sixth lens, the seventh lens and the eighth lens is avoided, the sensitivity of the optical imaging lens is favorably reduced, and the yield is improved; meanwhile, the processability of the fifth lens, the sixth lens, the seventh lens and the eighth lens can be improved, and the injection molding of the lenses is facilitated; the aberration correction of the optical imaging lens is facilitated by balancing the aberration generated by the front four lenses. Preferably, -1.4< f67/f5678< -0.6.

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 optical imaging lens is ensured to have higher aberration correction capability, and the excessive concentration of the focal 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 optical 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 focal power of the first lens and the sixth lens, the spherical aberration contribution amount of the first lens and the sixth lens can be controlled within a reasonable range, so that the optical imaging lens obtains 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 lenses in the optical imaging lens satisfies: vg > 70.0. By restricting the maximum value in the dispersion coefficient of the glass lens in the optical imaging 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 optical imaging 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 optical imaging lens satisfies: vp < 19.0. By constraining the minimum value in the dispersion coefficient of the plastic lens in the optical imaging lens, the dispersion capacity of the plastic lens is reasonably distributed, so that chromatic aberration generated by the plastic lens and the glass lens are balanced with each other, the chromatic aberration of the optical imaging 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 the plastic lens in the optical imaging lens and a maximum value Ng of refractive indexes of the glass lens in the optical imaging lens satisfy: Np-Ng >0. The dispersion capacity of the optical imaging 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 method is beneficial to the forming processing of the plastic lens and the glass lens, and further the production yield of the optical imaging lens is improved. Preferably, Np-Ng > 0.1.

In this embodiment, a minimum value Vamin of the abbe numbers of the front four lenses in the optical imaging lens and a minimum value Vbmin of the abbe numbers of the rear four lenses in the optical 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 optical imaging lens is more reasonable, the processability and the use stability of the optical imaging lens are facilitated, meanwhile, the chromatic aberration of the optical imaging 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 object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: 0<1/(R8/R7+ R10/R9) < 2.0. By limiting 1/(R8/R7+ R10/R9) within a reasonable range, the bending degree of the fourth lens and the bending degree of the fifth lens are reasonably controlled, the injection molding of the fourth lens and the fifth lens are facilitated, and the processability of the optical imaging lens is improved. Preferably, 0.1<1/(R8/R7+ R10/R9) < 1.8.

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: 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 lens and the second lens can be reasonably controlled, and the first lens and the second lens can be ensured to 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 caused by 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 on-axis distance SAG82 between the edge thickness ET8 of the eighth lens, the intersection point of the image-side surface of the eighth lens and the optical axis, and the effective radius vertex of the image-side surface of the eighth lens 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 reduction of the sensitivity of the optical imaging lens is facilitated. 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 between the intersection of the image-side surface of the sixth lens and the optical axis and the effective radius vertex of the image-side surface of the sixth lens 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 object-side surface of the first lens and the optical axis and the effective radius vertex of the object-side surface of the first lens and the maximum effective radius DT11 of the object-side surface of the first lens 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 thicknesses ET3, ET4 and ET5 of the third lens and the fourth 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 optical imaging 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 object-side surface of the sixth lens, the radius of curvature R12 of the image-side surface of the sixth lens, the radius of curvature R13 of the object-side surface of the seventh lens, and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: 0< R13/R12+ R14/R11< 1.0. By controlling the power of the sixth lens and the power of the seventh lens in a reasonable range and reasonably distributing the powers of the R13/R12+ R14/R11, the on-axis aberration generated by the system can be effectively balanced. Preferably, 0.1< R13/R12+ R14/R11< 0.9.

In the present embodiment, a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0< R6/(R5+ R6) < 1.0. By controlling R6/(R5+ R6) within a reasonable range, the shape of the third lens can be effectively constrained, ensuring good workability of the third lens while reducing the sensitivity of the third lens. Preferably, 0.4< R6/(R5+ R6) < 0.9.

In this embodiment, the second lens element has a negative refractive power, the object-side surface of the second lens element is convex, and the image-side surface of the second lens element is concave; 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 concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the eighth lens has negative focal power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface. The second lens and the eighth lens are arranged to have negative focal power, so that the image surface supported by the optical imaging 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 optical imaging lens is facilitated, and the image surface definition is improved; by setting the third lens to have positive focal power, light can be better converged on the image side surface while the optical imaging lens supports a larger field angle; the object side surface of the sixth lens is set to be the convex surface, the image side surface of the sixth lens is set to be the concave surface, so that the aberration of a peripheral field of view can be effectively reduced while the light transmission quantity is increased, the reasonable distribution of focal power of the whole optical imaging 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 optical imaging lens is favorably and better balanced, and the aberration of the optical imaging lens is corrected, so that the imaging quality of the optical imaging lens is improved.

Example two

As shown in fig. 1 to 32, the optical imaging lens sequentially includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the object side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the sixth lens has negative focal power; the image side surface of the eighth lens is a concave surface; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging 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 f12 of the first lens and the second lens satisfy that: 0.5< f1234/f12< 1.5; 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 optical imaging lens can support a larger image plane by setting the object side surface of the fourth lens to be a concave surface, which means higher resolution and image quality; the concave surface of the image side surface of the fifth lens enables the optical imaging lens to support a larger field angle, so that the optical imaging lens has a wider imaging range, the collection capability of the optical imaging lens on object information is improved, and meanwhile, the aberration of the marginal field of view is favorably reduced; the sixth lens is set to have negative focal power, so that the optical imaging lens can obtain higher relative brightness, the imaging is clearer, meanwhile, the reasonable distribution of the focal power of the optical imaging lens is facilitated, the integral aberration is better corrected, and the imaging quality is higher; the image side face of the eighth lens is set to be the concave face, so that the size layout of the optical imaging lens is more reasonable, the higher space utilization rate is realized, the emergent angle of light can be adjusted, and the matching performance with a chip is increased, so that the image quality is improved, and the effect of high resolving power is realized. By limiting TTL/ImgH within a reasonable range, the optical imaging lens can be ultrathin, so that the optical imaging lens is better compatible with ultrathin electronic equipment, and the portability requirement of the optical imaging lens is met. By limiting f1234/f12 within a reasonable range, the object side end of the optical imaging lens can have enough light convergence capacity to adjust the focusing position of the light beam, so that the total length of the optical imaging lens is shortened, and the requirement of ultra-thinness is met; and meanwhile, the combined focal length of the first lens, the second lens, the third lens and the fourth lens is controlled, so that the aberration generated by the front four lenses and the aberration generated by the rear four lenses of the optical imaging lens are balanced, better imaging quality is obtained, and the effect of high resolving power is realized. By restricting the range of CT7/T78, the field curvature contribution amount of the seventh lens is controlled, so that the overall field curvature of the optical imaging lens is balanced in a reasonable range.

Preferably, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface 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 f12 of the first lens and the second lens satisfy that: 0.6< f1234/f12< 1.2.

In the present embodiment, a maximum value Vg of the dispersion coefficients of the glass lens in the optical imaging lens satisfies: vg > 70.0. By restricting the maximum value in the dispersion coefficient of the glass lens in the optical imaging 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 optical imaging lens is fully corrected, and better imaging quality is ensured. Preferably 72< Vg.

In this embodiment, the second lens element has a negative refractive power, the object-side surface of the second lens element is convex, and the image-side surface of the second lens element is concave; 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 concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the eighth lens has negative focal power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface. The second lens and the eighth lens are arranged to have negative focal power, so that the image surface supported by the optical imaging 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 optical imaging lens is facilitated, and the image surface definition is improved; by setting the third lens to have positive focal power, light can be better converged on the image side surface while the optical imaging lens supports a larger field angle; the object side surface of the sixth lens is set to be the convex surface, the image side surface of the sixth lens is set to be the concave surface, so that the aberration of a peripheral field of view can be effectively reduced while the light transmission quantity is increased, the reasonable distribution of focal power of the whole optical imaging lens is facilitated, and the imaging quality is improved.

Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens in the present application may employ a plurality of lenses, for example, the above-described 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 optical imaging lens also has large aperture and 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 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and image plane S19.

The first lens element E1 has positive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is convex, and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative power, and the object-side surface S11 of the sixth lens element is convex, and the image-side surface S12 of the sixth lens element is concave. The seventh lens 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. Filter E9 has an object side S17 and an image side S18. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 8.65mm, the total length TTL of the optical imaging lens is 9.71mm, and the image height ImgH is 8.17 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 A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S16 in example one.

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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and image plane S19.

In this example, the total effective focal length f of the optical imaging lens is 8.68mm, the total length TTL of the optical imaging lens is 9.8mm, and the image height ImgH is 8.17 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and image plane S19.

In this example, the total effective focal length f of the optical imaging lens is 8.34mm, the total length TTL of the optical imaging lens is 9.86mm, and the image height ImgH is 8.17 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and image plane S19.

The first lens element E1 has positive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is convex, and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative power, and the object-side surface S11 of the sixth lens element is convex, and the image-side surface S12 of the sixth lens element is concave. The seventh lens 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. Filter E9 has an object side S17 and an image side S18. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 9.34mm, the total length TTL of the optical imaging lens is 10.33mm, and the image height ImgH is 8.17 mm.

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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and image plane S19.

The first lens element E1 has positive power, and the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has positive refractive power, and the object-side surface S9 of the fifth lens element is convex, and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative power, and the object-side surface S11 of the sixth lens element is convex, and the image-side surface S12 of the sixth lens element is concave. The seventh lens 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. Filter E9 has an object side S17 and an image side S18. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens is 8.64mm, the total length TTL of the optical imaging lens is 9.50mm, and the image height ImgH is 8.17 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.5398E-04

-6.2301E-04

1.2851E-03

-2.4594E-03

3.0553E-03

-2.5936E-03

1.5240E-03

S2

-3.3209E-03

3.0083E-03

-1.0970E-02

2.5428E-02

-3.8189E-02

3.9007E-02

-2.7957E-02

S3

-2.2269E-03

-2.2753E-03

1.3273E-02

-3.1365E-02

4.9728E-02

-5.4504E-02

4.2369E-02

S4

-1.0287E-03

7.0153E-03

-2.9645E-02

8.5872E-02

-1.6152E-01

2.0842E-01

-1.8996E-01

S5

-1.2133E-03

-3.3806E-03

1.1435E-02

-2.7244E-02

4.2359E-02

-4.4600E-02

3.2794E-02

S6

-1.7567E-03

-6.3211E-03

1.8145E-02

-3.9061E-02

5.9081E-02

-6.3672E-02

4.9344E-02

S7

-9.7252E-03

-1.1682E-02

1.5655E-02

-1.7508E-02

1.3222E-02

-6.8908E-03

2.4420E-03

S8

-5.7268E-03

-1.2696E-02

3.0431E-04

2.2862E-02

-3.9774E-02

3.7495E-02

-2.2989E-02

S9

1.0092E-03

-1.7924E-02

5.1871E-03

1.2673E-02

-2.0194E-02

1.5859E-02

-8.0647E-03

S10

1.6722E-03

-1.6686E-02

1.1883E-02

-4.9702E-03

9.8398E-04

1.9478E-04

-2.1907E-04

S11

-3.3592E-03

-5.1037E-03

5.7115E-03

-4.8886E-03

2.7798E-03

-1.1292E-03

3.3726E-04

S12

-3.6186E-02

9.7278E-03

-3.1118E-04

-1.9966E-03

1.3477E-03

-5.2616E-04

1.4151E-04

S13

-3.2869E-02

5.5167E-03

-1.1713E-03

1.7367E-04

-1.6669E-05

6.9043E-07

7.8766E-08

S14

-1.7088E-03

-4.4579E-03

1.6441E-03

-4.3324E-04

8.3151E-05

-1.1646E-05

1.1956E-06

S15

-1.3395E-02

2.6475E-03

-9.7684E-05

-8.1394E-05

2.3265E-05

-3.2123E-06

2.7309E-07

S16

-1.9602E-02

3.8709E-03

-6.9825E-04

1.0636E-04

-1.3872E-05

1.4759E-06

-1.1933E-07

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-6.2491E-04

1.7807E-04

-3.4537E-05

4.3465E-06

-3.1992E-07

1.0451E-08

0.0000E+00

S2

1.4295E-02

-5.2387E-03

1.3647E-03

-2.4658E-04

2.9363E-05

-2.0718E-06

6.5595E-08

S3

-2.3684E-02

9.5462E-03

-2.7486E-03

5.5112E-04

-7.3074E-05

5.7563E-06

-2.0390E-07

S4

1.2420E-01

-5.8462E-02

1.9638E-02

-4.5909E-03

7.0951E-04

-6.5151E-05

2.6911E-06

S5

-1.7027E-02

6.2205E-03

-1.5651E-03

2.5830E-04

-2.5177E-05

1.0987E-06

0.0000E+00

S6

-2.7435E-02

1.0811E-02

-2.9397E-03

5.2373E-04

-5.4954E-05

2.5728E-06

0.0000E+00

S7

-5.6142E-04

7.5412E-05

-4.5215E-06

0.0000E+00

S8

9.6538E-03

-2.8057E-03

5.5542E-04

-7.1474E-05

5.3872E-06

-1.8023E-07

0.0000E+00

S9

2.8459E-03

-7.1161E-04

1.2578E-04

-1.5366E-05

1.2329E-06

-5.8365E-08

1.2322E-09

S10

8.2622E-05

-1.8932E-05

2.8765E-06

-2.9190E-07

1.9073E-08

-7.2743E-10

1.2332E-11

S11

-7.4620E-05

1.2167E-05

-1.4370E-06

1.1902E-07

-6.5273E-09

2.1205E-10

-3.0801E-12

S12

-2.7330E-05

3.8194E-06

-3.8195E-07

2.6557E-08

-1.2157E-09

3.2862E-11

-3.9681E-13

S13

-1.6986E-08

1.5243E-09

-8.2187E-11

2.8237E-12

-6.0754E-14

7.4890E-16

-4.0464E-18

S14

-8.9792E-08

4.8869E-09

-1.8945E-10

5.0773E-12

-8.9150E-14

9.2085E-16

-4.2357E-18

S15

-1.5468E-08

6.0277E-10

-1.6260E-11

2.9848E-13

-3.5548E-15

2.4703E-17

-7.5676E-20

S16

7.0372E-09

-2.9713E-10

8.8449E-12

-1.8090E-13

2.4171E-15

-1.8994E-17

6.6563E-20

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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and image plane S19.

In this example, the total effective focal length f of the optical imaging lens is 8.55mm, the total length TTL of the optical imaging lens is 9.53mm, and the image height ImgH is 8.17 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-4.7102E-04

-4.2318E-04

8.9449E-04

-1.8827E-03

2.4888E-03

-2.2119E-03

1.3458E-03

S2

-2.4594E-03

1.4984E-03

-6.3291E-03

1.6439E-02

-2.6975E-02

2.9608E-02

-2.2551E-02

S3

-1.9851E-03

-4.0553E-04

6.0627E-03

-1.4359E-02

2.2986E-02

-2.5216E-02

1.9434E-02

S4

-4.4024E-04

3.4372E-03

-1.2722E-02

3.8201E-02

-7.3822E-02

9.7766E-02

-9.1343E-02

S5

-1.5503E-03

-9.1343E-04

1.4616E-03

-3.0539E-03

4.1383E-03

-3.3836E-03

1.6739E-03

S6

-2.0654E-03

-4.6175E-03

1.1845E-02

-2.4338E-02

3.5530E-02

-3.7172E-02

2.8150E-02

S7

-9.7055E-03

-9.9716E-03

1.1399E-02

-1.1871E-02

8.5683E-03

-4.3884E-03

1.5666E-03

S8

-6.9138E-03

-1.0294E-02

-1.2339E-03

1.9710E-02

-3.1810E-02

2.8803E-02

-1.7147E-02

S9

-3.6616E-03

-9.5163E-03

-3.9811E-03

1.9168E-02

-2.3105E-02

1.6550E-02

-8.0349E-03

S10

-2.7246E-03

-9.7713E-03

5.4365E-03

-9.1814E-04

-7.7428E-04

7.2045E-04

-3.2230E-04

S11

-6.3016E-03

-5.6034E-04

1.7454E-03

-1.9390E-03

1.0333E-03

-3.5883E-04

9.0138E-05

S12

-3.4478E-02

1.0714E-02

-1.3401E-03

-1.2384E-03

9.3430E-04

-3.6893E-04

9.9829E-05

S13

-3.0300E-02

4.0749E-03

-5.6613E-04

1.6678E-05

1.1574E-05

-3.0199E-06

4.3720E-07

S14

-1.5020E-03

-5.1164E-03

1.8558E-03

-4.5314E-04

7.9385E-05

-1.0197E-05

9.7135E-07

S15

-2.6828E-03

-1.7275E-03

7.7029E-04

-1.6919E-04

2.5471E-05

-2.6618E-06

1.9305E-07

S16

-7.0260E-03

-6.6921E-04

3.5480E-04

-7.0601E-05

8.7405E-06

-7.1566E-07

3.9396E-08

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-5.6744E-04

1.6553E-04

-3.2780E-05

4.2054E-06

-3.1529E-07

1.0487E-08

0.0000E+00

S2

1.2159E-02

-4.6724E-03

1.2710E-03

-2.3903E-04

2.9553E-05

-2.1605E-06

7.0750E-08

S3

-1.0669E-02

4.1842E-03

-1.1610E-03

2.2208E-04

-2.7773E-05

2.0361E-06

-6.6031E-08

S4

6.1149E-02

-2.9440E-02

1.0105E-02

-2.4123E-03

3.8044E-04

-3.5627E-05

1.4998E-06

S5

-4.0862E-04

-2.8728E-05

5.3910E-05

-1.6859E-05

2.4433E-06

-1.4269E-07

0.0000E+00

S6

-1.5381E-02

5.9835E-03

-1.6121E-03

2.8533E-04

-2.9807E-05

1.3918E-06

0.0000E+00

S7

-3.6908E-04

5.1337E-05

-3.2160E-06

0.0000E+00

S8

7.0264E-03

-1.9967E-03

3.8653E-04

-4.8572E-05

3.5641E-06

-1.1549E-07

0.0000E+00

S9

2.7569E-03

-6.7641E-04

1.1791E-04

-1.4249E-05

1.1331E-06

-5.3219E-08

1.1157E-09

S10

9.3588E-05

-1.8763E-05

2.6228E-06

-2.5128E-07

1.5743E-08

-5.8174E-10

9.6267E-12

S11

-1.7222E-05

2.5453E-06

-2.8593E-07

2.3258E-08

-1.2676E-09

4.0736E-11

-5.7606E-13

S12

-1.9535E-05

2.7827E-06

-2.8424E-07

2.0163E-08

-9.3893E-10

2.5732E-11

-3.1397E-13

S13

-4.2317E-08

2.8225E-09

-1.2972E-10

4.0333E-12

-8.1050E-14

9.5069E-16

-4.9471E-18

S14

-6.8547E-08

3.5447E-09

-1.3169E-10

3.4035E-12

-5.7885E-14

5.8102E-16

-2.6034E-18

S15

-9.7946E-09

3.4922E-10

-8.6918E-12

1.4739E-13

-1.6146E-15

1.0215E-17

-2.7945E-20

S16

-1.4492E-09

3.4048E-11

-4.3246E-13

2.8807E-16

7.9439E-17

-1.1108E-18

5.2003E-21

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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and image plane S19.

In this example, the total effective focal length f of the optical imaging lens is 9.31mm, the total length TTL of the optical imaging lens is 10.26mm, and the image height ImgH is 8.17 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: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, eighth lens E8, filter E9, and image plane S19.

The first lens element E1 has positive power, and the object-side surface S1 of the first lens element is convex and the image-side surface S2 of the first lens element is concave. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive refractive power, and the object-side surface S5 of the third lens element is convex, and the image-side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is convex, and the image-side surface S10 of the fifth lens element is concave. The sixth lens element E6 has negative power, and the object-side surface S11 of the sixth lens element is convex, and the image-side surface S12 of the sixth lens element is concave. The seventh lens 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. Filter E9 has an object side S17 and an image side S18. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

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

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.

Conditions/examples	1	2	3	4	5	6	7	8
									TTL/ImgH	1.19	1.20	1.21	1.27	1.16	1.17	1.26	1.22
f*tan(FOV/2)	7.99	7.97	7.97	7.97	8.00	7.98	8.10	7.97
									CT7/T78	0.56	0.60	0.83	0.58	0.52	0.55	0.72	0.58
f1234/f12	0.71	0.72	0.74	0.75	0.99	1.00	0.67	0.73
									f67/f5678	-1.02	-0.90	-0.69	-0.94	-0.91	-0.73	-1.23	-0.97
f2/f3+f8/f7	-1.30	-1.38	-1.49	-1.38	-1.27	-1.24	-1.41	-1.40
									f/f1-f/f6	1.04	1.03	1.01	1.02	1.26	1.15	1.06	1.02
Vg	73.70	73.70	73.70	73.70	80.50	80.50	73.70	73.70
									Vp	18.40	18.40	18.40	18.40	17.70	17.70	18.40	18.40
Np-Ng	0.16	0.16	0.16	0.16	0.19	0.19	0.16	0.16
									(Vamin+Vbmin)/2	18.80	18.80	18.40	18.80	18.45	18.45	18.40	18.80
1/(R8/R7+R10/R9)	0.88	0.90	0.93	0.57	0.29	0.32	1.61	0.88
									(R1+R2)/(R3+R4)	0.96	0.94	1.06	0.84	1.05	1.04	0.92	0.92
ET1/CT1+ET2/CT2	1.64	1.65	1.78	1.63	1.46	1.49	1.68	1.64
									ET8/SAG82	-0.25	-0.27	-0.26	-0.45	-0.17	-0.17	-0.18	-0.27
CT6/SAG62	-0.50	-0.52	-0.54	-0.56	-0.43	-0.43	-0.48	-0.55
									SAG11/DT11	0.45	0.45	0.44	0.46	0.39	0.38	0.45	0.45
ET4/(ET3+ET5)	0.46	0.45	0.54	0.50	0.43	0.40	0.34	0.44
									R13/R12+R14/R11	0.61	0.64	0.86	0.22	0.26	0.18	0.40	0.59
R6/(R5+R6)	0.60	0.60	0.59	0.62	0.73	0.79	0.60	0.60

TABLE 17

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

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 obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to 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 of the optical imaging lens:

a first lens;

a second lens;

a third lens;

the object side surface of the fourth lens is a concave surface;

the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;

A sixth lens having a negative optical power;

a seventh lens;

an eighth lens element, an image-side surface of which is concave;

the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging 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 maximum field angle FOV of the optical imaging lens and the effective focal length f of the optical imaging lens meet the following condition: f tan (FOV/2>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 optical 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 f12 of the first lens and the second lens satisfy: 0.5< f1234/f12< 1.5.

3. The optical imaging lens of claim 1, wherein a combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens and the eighth lens, and a combined focal length f67 of the sixth lens and the seventh lens satisfy: -1.5< f67/f5678< -0.5.

4. The optical imaging lens of claim 1, wherein 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.

5. The optical imaging lens of claim 1, wherein the effective focal length f of the optical 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.

6. The optical imaging lens of claim 1, wherein the maximum value Vg of the abbe number of the glass lens in the optical imaging lens satisfies: vg > 70.0.

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

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

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

10. 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, the radius of curvature of the object-side surface of the fifth lens, R9 and the radius of curvature of the image-side surface of the fifth lens, R10 satisfy: 0<1/(R8/R7+ R10/R9) < 2.0.

11. 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: 0.5< (R1+ R2)/(R3+ R4) < 1.5.

12. 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, an edge thickness ET1 of the first lens, and an edge thickness ET2 of the second lens satisfy: 1.0< ET1/CT1+ ET2/CT2< 2.0.

13. The optical imaging lens of claim 1, wherein the edge thickness ET8 of the eighth lens, the on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis and the effective radius vertex of the image side surface of the eighth lens satisfy: -0.5< ET8/SAG82 <0.

14. The optical imaging lens of claim 1, wherein the center thickness CT6 of the sixth lens on the optical axis, the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: -0.8< CT6/SAG62< -0.3.

15. The optical imaging lens of claim 1, wherein an on-axis distance SAG11 between an intersection point of the object-side surface of the first lens and the optical axis and an effective radius vertex of the object-side surface of the first lens and a maximum effective radius DT11 of the object-side surface of the first lens satisfy: 0.2< SAG11/DT11< 0.7.

16. The optical imaging lens of claim 1, wherein 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.

17. The optical imaging lens of claim 1, wherein the radius of curvature of the object-side surface of the sixth lens R11, the radius of curvature of the image-side surface of the sixth lens R12, the radius of curvature of the object-side surface of the seventh lens R13, and the radius of curvature of the image-side surface of the seventh lens R14 satisfy: 0< R13/R12+ R14/R11< 1.0.

18. The optical imaging lens of claim 1, wherein a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0< R6/(R5+ R6) < 1.0.

19. The optical imaging lens according to claim 1,

the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

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 concave surface;

the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;

the eighth lens has negative focal power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface.

20. The optical imaging lens according to claim 1, characterized in that 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.

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

a first lens;

a second lens;

a third lens;

the object side surface of the fourth lens is a concave surface;

a sixth lens having a negative optical power;

a seventh lens;

an eighth lens element, an image-side surface of which is concave;

the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f12 of the first lens and the second lens satisfy the following condition: 0.5< f1234/f12< 1.5;

22. The optical imaging lens of claim 21, wherein a combined focal length f5678 of the fifth lens, the sixth lens, the seventh lens and the eighth lens, and a combined focal length f67 of the sixth lens and the seventh lens satisfy: -1.5< f67/f5678< -0.5.

23. The optical imaging lens of claim 21, wherein 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.

24. The optical imaging lens of claim 21, wherein the effective focal length f of the optical 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.

25. The optical imaging lens of claim 21, wherein the maximum value Vg of the abbe number of the glass lens in the optical imaging lens satisfies: vg > 70.0.

26. The optical imaging lens of claim 21, wherein a minimum value Vp of the abbe numbers of the plastic lenses in the optical imaging lens satisfies: vp < 19.0.

27. The optical imaging lens according to claim 21, wherein a maximum value Np of refractive indexes of plastic lenses in the optical imaging lens and a maximum value Ng of refractive indexes of glass lenses in the optical imaging lens satisfy: Np-Ng > 0.

28. The optical imaging lens of claim 21, wherein Vamin, the minimum value of the abbe numbers of the front four lenses in the optical imaging lens, and Vbmin, the minimum value of the abbe numbers of the rear four lenses in the optical imaging lens satisfy: (Vamin + Vbmin)/2< 19.0.

29. 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, the radius of curvature R9 of the object-side surface of the fifth lens, and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: 0<1/(R8/R7+ R10/R9) < 2.0.

30. 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: 0.5< (R1+ R2)/(R3+ R4) < 1.5.

31. 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, an edge thickness ET1 of the first lens, and an edge thickness ET2 of the second lens satisfy: 1.0< ET1/CT1+ ET2/CT2< 2.0.

32. The optical imaging lens of claim 21, wherein the edge thickness ET8 of the eighth lens, the on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis and the effective radius vertex of the image side surface of the eighth lens satisfy: -0.5< ET8/SAG82 <0.

33. The optical imaging lens of claim 21, wherein the center thickness CT6 of the sixth lens on the optical axis, the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: -0.8< CT6/SAG62< -0.3.

34. The optical imaging lens of claim 21, wherein an on-axis distance SAG11 between an intersection point of the object-side surface of the first lens and the optical axis and an effective radius vertex of the object-side surface of the first lens and a maximum effective radius DT11 of the object-side surface of the first lens satisfy: 0.2< SAG11/DT11< 0.7.

35. The optical imaging lens of claim 21, wherein 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.

36. The optical imaging lens of claim 21, wherein the radius of curvature R11 of the object-side surface of the sixth lens, the radius of curvature R12 of the image-side surface of the sixth lens, the radius of curvature R13 of the object-side surface of the seventh lens, and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: 0< R13/R12+ R14/R11< 1.0.

37. The optical imaging lens of claim 21, wherein a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0< R6/(R5+ R6) < 1.0.

38. The optical imaging lens of claim 21,

The object side surface of the sixth lens element is a convex surface, and the image side surface of the sixth lens element is a concave surface;

39. The optical imaging lens of claim 21, wherein 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 greater than 1.60.