CN114594572A

CN114594572A - Optical imaging lens

Info

Publication number: CN114594572A
Application number: CN202210240975.6A
Authority: CN
Inventors: 刘晓飞; 耿晓婷; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-06-07
Anticipated expiration: 2042-03-10
Also published as: CN117518410A; CN114594572B

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a first lens with positive refractive power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens element with negative refractive power; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element with positive refractive power having a convex object-side surface; the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface meet the following conditions: 4.7mm < ImgH × ImgH/TTL <5.7 mm. The invention solves the problem that the optical imaging lens in the prior art has high image quality and is difficult to be miniaturized.

Description

Optical imaging lens

Technical Field

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

Background

Recently, the requirement for the mobile terminal is higher and higher, and the trend of requiring the high definition of the mobile terminal becomes more and more obvious along with the continuous upgrade of the module technology required by the market, so that the requirement for the imaging quality of the imaging lens is higher and higher, and meanwhile, the weight of the mobile terminal is required to be lighter and lighter, while the optical imaging lens in the prior art is difficult to consider the high image quality and the miniaturization.

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

Disclosure of Invention

The invention mainly aims to provide an optical imaging lens to solve the problem that the optical imaging lens in the prior art is high in image quality and difficult to miniaturize.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens comprising: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens element with negative refractive power; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element with positive refractive power having a convex object-side surface; the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface meet the following conditions: 4.7mm < ImgH/TTL <5.7 mm.

Further, the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens satisfy: 5.5mm < f tan (FOV/2) <6.7 mm.

Further, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.3.

Further, the effective focal length f6 of the sixth lens and the effective focal length f1 of the first lens satisfy: 1.1< f6/f1< 1.5.

Further, the effective focal length f5 of the fifth lens, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 0.4< f5/(f2+ f3) < 0.9.

Further, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 1.4< (R2+ R1)/(R2-R1) < 2.0.

Further, a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 2.2< (R3+ R4)/(R3-R4) < 3.7.

Further, the effective focal length f of the optical imaging lens, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 2.1< (R9+ R10)/f < 2.6.

Further, a radius of curvature R13 of the object-side surface of the seventh lens and a radius of curvature R14 of the image-side surface of the seventh lens satisfy: 2.8< (R13-R14)/(R13+ R14) < 3.4.

Further, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 6.5< f12/(CT1+ CT2) < 7.2.

Further, an on-axis distance SAG51 between an intersection point of an object-side surface of the fifth lens and an optical axis of the optical imaging lens and an effective radius vertex of the object-side surface of the fifth lens, an on-axis distance SAG52 between an intersection point of an image-side surface of the fifth lens and the optical axis and an effective radius vertex of an image-side surface of the fifth lens, and an on-axis distance SAG42 between an intersection point of an image-side surface of the fourth lens and the optical axis and an effective radius vertex of an image-side surface of the fourth lens satisfy: 3.6< (SAG51+ SAG52)/SAG42< 4.6.

Further, an air gap T45 on the optical axis of the optical imaging lens between the fourth lens and the fifth lens, an air gap T56 on the optical axis of the fifth lens and the sixth lens, and an air gap T67 on the optical axis of the sixth lens and the seventh lens satisfy: 1.0< (T45+ T56)/T67< 1.4.

Further, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens and the edge thickness ET7 of the seventh lens satisfy: 1.0< (ET6+ ET7)/(ET4+ ET5) < 1.7.

According to another aspect of the present invention, there is provided an optical imaging lens including: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens element with negative refractive power; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element with positive refractive power having a convex object-side surface; the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH < 1.3.

By applying the technical scheme of the invention, the optical imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the third lens element with negative refractive power; the fourth lens element with positive refractive power; the fifth lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the sixth lens element with positive refractive power has a convex object-side surface; the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface meet the following conditions: 4.7mm < ImgH/TTL <5.7 mm.

By distributing the refractive power of the lens of the optical imaging lens and designing the surface type of the lens, the low-order aberration of the optical imaging lens can be effectively balanced, meanwhile, the tolerance sensitivity of the optical imaging lens can be reduced, the miniaturization of the optical imaging lens is kept, and meanwhile, the imaging quality of the optical imaging lens is ensured. By controlling ImgH/TTL within a reasonable range, the size of the optical imaging lens can be effectively reduced, which is beneficial to the miniaturization of the optical imaging lens. Meanwhile, the positive refractive power of the first lens element and the negative refractive power of the seventh lens element can effectively reduce the aberration of the peripheral field of view while increasing the amount of light passing, and the second lens element and the third lens element have negative refractive power and the fourth lens element has positive refractive power, so that the refractive power distribution of the whole optical imaging lens is facilitated, the excessive concentration of the refractive power is avoided, and the combination of the negative and positive refractive powers of the fifth lens element, the sixth lens element and the seventh lens element is simultaneously used for facilitating the increase of the amount of light passing of the optical imaging lens, so that the optical imaging lens has high relative illumination, and the imaging quality of the optical imaging lens in a dark environment can be well improved.

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 structural view showing an optical imaging lens according to a first example of the present invention;

fig. 2 to 5 respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens in fig. 1;

fig. 6 is a schematic view showing a configuration of an optical imaging lens according to a second example of the present invention;

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

fig. 11 is a schematic structural view showing an optical imaging lens of example three of the present invention;

fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 11;

fig. 16 is a schematic configuration diagram showing an optical imaging lens of example four of the present invention;

fig. 17 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 16.

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, a filter plate; s15, filtering the object side surface of the filter; s16, an image side surface of the filter; and S17, 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 to be noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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

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

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

The invention provides an optical imaging lens, aiming at solving the problem that the optical imaging lens in the prior art has high image quality and is difficult to be miniaturized.

Example one

As shown in fig. 1 to 20, the optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the third lens element with negative refractive power; the fourth lens element with positive refractive power; the fifth lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the sixth lens element with positive refractive power has a convex object-side surface; the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface meet the following conditions: 4.7mm < ImgH/TTL <5.7 mm.

By distributing the refractive power of the lens of the optical imaging lens and designing the surface type of the lens, the low-order aberration of the optical imaging lens can be effectively balanced, meanwhile, the tolerance sensitivity of the optical imaging lens can be reduced, the miniaturization of the optical imaging lens is kept, and meanwhile, the imaging quality of the optical imaging lens is ensured. By controlling ImgH/TTL within a reasonable range, the size of the optical imaging lens can be effectively reduced, and the optical imaging lens is favorably miniaturized. Meanwhile, the positive refractive power of the first lens element and the negative refractive power of the seventh lens element can effectively reduce the aberration of the peripheral field of view while increasing the amount of light passing, and the second lens element and the third lens element have negative refractive power and the fourth lens element has positive refractive power, so that the refractive power distribution of the whole optical imaging lens is facilitated, the excessive concentration of the refractive power is avoided, and the combination of the negative and positive refractive powers of the fifth lens element, the sixth lens element and the seventh lens element is simultaneously used for facilitating the increase of the amount of light passing of the optical imaging lens, so that the optical imaging lens has high relative illumination, and the imaging quality of the optical imaging lens in a dark environment can be well improved.

Preferably, the length ImgH of a half of a diagonal line of an effective pixel area on an imaging surface of the optical imaging lens and the on-axis distance TTL from an object side surface of the first lens to the imaging surface satisfy: 4.8mm < ImgH/TTL <5.6 mm. In the present embodiment, the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens satisfy: 5.5mm < f tan (FOV/2) <6.7 mm. By controlling f & lttan & gt (FOV/2) within a reasonable range, the image height of the optical imaging lens can be improved, and meanwhile, the phenomenon that the aberration of the marginal field of view is too large is avoided, so that the optical imaging lens has a large imaging range, and meanwhile, the imaging quality of the optical imaging lens is guaranteed. Preferably, 5.7mm < f tan (FOV/2) <6.6 mm.

In this embodiment, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.3. By limiting TTL/ImgH within a reasonable range, the total length of the optical imaging lens can be effectively reduced, and the seven-piece optical imaging lens is favorable for realizing ultra-thinness and miniaturization, so that the optical imaging lens can be better suitable for ultra-thin electronic products. Preferably, 1.1< TTL/ImgH < 1.3.

In the present embodiment, the effective focal length f6 of the sixth lens and the effective focal length f1 of the first lens satisfy: 1.1< f6/f1< 1.5. Through the effective focal length of rational distribution first lens element and the effective focal length of sixth lens element, optical imaging lens can shorten the size more effectively, avoids optical imaging lens's refractive power to concentrate excessively when guaranteeing optical imaging lens's ultra-thin characteristic, and four preceding lens elements of cooperation make optical imaging lens's aberration can obtain better correction, guarantee optical imaging lens's imaging quality. Preferably, 1.2< f6/f1< 1.4.

In the present embodiment, the effective focal length f5 of the fifth lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 0.4< f5/(f2+ f3) < 0.9. The effective focal lengths of the second lens, the third lens and the fifth lens are reasonably controlled, so that the size of the optical imaging lens can be effectively reduced, the condition that the refractive power of the optical imaging lens is excessively concentrated on the second lens and the third lens is avoided, and the spherical aberration contribution amounts of the first three lenses can be controlled within a reasonable range, so that the optical imaging lens can obtain better imaging quality. Preferably, 0.5< f5/(f2+ f3) < 0.8.

In the present embodiment, a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 1.4< (R2+ R1)/(R2-R1) < 2.0. By limiting (R2+ R1)/(R2-R1) within a reasonable range, the light rays have certain divergence function when passing through the object side surface of the first lens, which can help to reduce TTL/EFL ratio on the premise of keeping the image quality of the optical imaging lens, and is beneficial to the optical imaging lens to obtain smaller Fno. Preferably, 1.5< (R2+ R1)/(R2-R1) < 1.9.

In the present embodiment, a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 2.2< (R3+ R4)/(R3-R4) < 3.7. Through the curvature radius of rationally distributing second lens object side and image side, astigmatism and coma between several lenses at back can be balanced effectively to the cooperation with f5/(f2+ f3) restriction can make optical imaging lens keep better image quality in reasonable scope, be favorable to promoting optical imaging lens and realize high definition formation of image at the image height of formation of image face here simultaneously. Preferably, 2.3< (R3+ R4)/(R3-R4) < 3.6.

In the present embodiment, the effective focal length f of the optical imaging 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: 2.1< (R9+ R10)/f < 2.6. The first advantage is that the refractive power of the optical imaging lens can be more reasonably distributed, excessive concentration on the first lenses is avoided, the imaging quality of the optical imaging lens is improved, the sensitivity of the optical imaging lens is reduced, and the second advantage is that the light and thin property of the optical imaging lens is maintained and the spherical aberration of the whole system is corrected. Preferably, 2.15< (R9+ R10)/f < 2.5.

In the present embodiment, a radius of curvature R13 of the object-side surface of the seventh lens and a radius of curvature R14 of the image-side surface of the seventh lens satisfy: 2.8< (R13-R14)/(R13+ R14) < 3.4. By limiting (R13-R14)/(R13+ R14) within a reasonable range, the shape of the seventh lens can be controlled, the processing and molding of the seventh lens are facilitated, the sensitivity of the seventh lens is reduced, and meanwhile stray light at the tail end of the optical imaging lens can be improved through the shape of the seventh lens, and the imaging quality of the optical imaging lens is ensured. Preferably, 2.9< (R13-R14)/(R13+ R14) < 3.3.

In the present embodiment, the composite focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 6.5< f12/(CT1+ CT2) < 7.2. By controlling f12/(CT1+ CT2) within a reasonable range, the processing of the first lens and the second lens can be controlled easily, and the size of the head can be reduced to some extent, thereby reducing the sensitivity of the lens. Preferably 6.6< f12/(CT1+ CT2) < 7.1.

In the present embodiment, the on-axis distance SAG51 between the intersection point of the object-side surface of the fifth lens and the optical axis of the optical imaging lens and the effective radius vertex of the object-side surface of the fifth lens, the on-axis distance SAG52 between the intersection point of the image-side surface of the fifth lens and the optical axis and the effective radius vertex of the image-side surface of the fifth lens, and the on-axis distance SAG42 between the intersection point of the image-side surface of the fourth lens and the optical axis and the effective radius vertex of the image-side surface of the fourth lens satisfy: 3.6< (SAG51+ SAG52)/SAG42< 4.6. By controlling (SAG51+ SAG52)/SAG42 in a reasonable range, light can be converged well, the refractive power of the lens is reasonably distributed, the field angle is increased on the basis of achieving good convergence, meanwhile, smooth transmission of light in a light path is ensured, the deflection angle of the light is compressed, and processing of the lens in the later period is facilitated. Preferably, 3.8< (SAG51+ SAG52)/SAG42< 4.4.

In the present embodiment, the air gap T45 on the optical axis of the optical imaging lens between the fourth lens and the fifth lens, the air gap T56 on the optical axis of the fifth lens and the sixth lens, and the air gap T67 on the optical axis of the sixth lens and the seventh lens satisfy: 1.0< (T45+ T56)/T67< 1.4. By controlling (T45+ T56)/T67 within a reasonable range, the condition of light leakage of an edge field of view can be improved, stray light and ghost images are improved, the illumination of an imaging surface is increased on the basis, and the imaging quality measurement of the optical imaging lens is ensured. Preferably, 1.1< (T45+ T56)/T67< 1.3.

In the present embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens satisfy: 1.0< (ET6+ ET7)/(ET4+ ET5) < 1.7. By limiting (ET6+ ET7)/(ET4+ ET5) in a reasonable range, the shapes of the fourth lens and the fifth lens are optimized, the manufacturability of the fifth lens is enhanced, meanwhile, the astigmatism of the optical imaging lens can be improved by controlling the edge thicknesses of the sixth lens and the seventh lens, the ghost intensity generated by the reflection of the sixth lens and the seventh lens can be weakened, and the imaging quality of the optical imaging lens is ensured. Preferably, 1.1< (ET6+ ET7)/(ET4+ ET5) < 1.7.

Example two

As shown in fig. 1 to 20, the optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the third lens element with negative refractive power; the fourth lens element with positive refractive power; the fifth lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the sixth lens element with positive refractive power has a convex object-side surface; the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy that: TTL/ImgH < 1.3.

By distributing the refractive power of the lens of the optical imaging lens and designing the surface type of the lens, the low-order aberration of the optical imaging lens can be effectively balanced, meanwhile, the tolerance sensitivity of the optical imaging lens can be reduced, the miniaturization of the optical imaging lens is kept, and meanwhile, the imaging quality of the optical imaging lens is ensured. By limiting TTL/ImgH within a reasonable range, the total length of the optical imaging lens can be effectively reduced, and the seven-piece optical imaging lens is favorable for realizing ultra-thinness and miniaturization, so that the optical imaging lens can be better suitable for ultra-thin electronic products. Meanwhile, the positive refractive power of the first lens element and the negative refractive power of the seventh lens element can effectively reduce the aberration of the peripheral field of view while increasing the amount of light passing, and the second lens element and the third lens element have negative refractive power and the fourth lens element has positive refractive power, so that the refractive power distribution of the whole optical imaging lens is facilitated, the excessive concentration of the refractive power is avoided, and the combination of the negative and positive refractive powers of the fifth lens element, the sixth lens element and the seventh lens element is simultaneously used for facilitating the increase of the amount of light passing of the optical imaging lens, so that the optical imaging lens has high relative illumination, and the imaging quality of the optical imaging lens in a dark environment can be well improved.

Preferably, an on-axis distance TTL from the object side surface of the first lens element to the imaging surface and a half ImgH of a diagonal length of the effective pixel area on the imaging surface satisfy: 1.1< TTL/ImgH < 1.3.

In the present embodiment, the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens satisfy: 5.5mm < f tan (FOV/2) <6.7 mm. By controlling f tan (FOV/2) within a reasonable range, the image height of the optical imaging lens can be improved, and meanwhile, the phenomenon that the aberration of the marginal field of view is too large is avoided, so that the optical imaging lens has a large imaging range, and meanwhile, the imaging quality of the optical imaging lens is guaranteed. Preferably, 5.7mm < f tan (FOV/2) <6.6 mm.

In the present embodiment, the effective focal length f5 of the fifth lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 0.4< f5/(f2+ f3) < 0.9. The effective focal lengths of the second lens, the third lens and the fifth lens are reasonably controlled, so that the size of the optical imaging lens can be effectively reduced, the refractive power of the optical imaging lens is prevented from being excessively concentrated on the second lens and the third lens, and the spherical aberration contribution amounts of the first three lenses can be controlled within a reasonable range, so that the optical imaging lens can obtain better imaging quality. Preferably, 0.5< f5/(f2+ f3) < 0.8.

In the present embodiment, the composite focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 6.5< f12/(CT1+ CT2) < 7.2. By controlling f12/(CT1+ CT2) within a reasonable range, the processing of the first lens and the second lens can be controlled easily, and the size of the head can be reduced to some extent, thereby reducing the sensitivity of the lens. Preferably, 6.6< f12/(CT1+ CT2) < 7.1.

In the present embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the edge thickness ET7 of the seventh lens satisfy: 1.0< (ET6+ ET7)/(ET4+ ET5) < 1.7. By limiting (ET6+ ET7)/(ET4+ ET5) in a reasonable range, the shapes of the fourth lens and the fifth lens are optimized, the manufacturability of the fifth lens is enhanced, meanwhile, the astigmatism of the optical imaging lens can be improved by controlling the edge thicknesses of the sixth lens and the seventh lens, the ghost intensity generated by reflection of the sixth lens and the seventh lens can be weakened, and the imaging quality of the optical imaging lens is ensured. Preferably, 1.1< (ET6+ ET7)/(ET4+ ET5) < 1.7.

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

The optical imaging lens in the present application may employ a plurality of lenses, for example, the seven lenses described above. By reasonably distributing the refractive power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like, the imaging quality of the optical imaging lens can be effectively improved, the sensitivity of the optical imaging lens is reduced, and the machinability of the optical imaging lens is 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.

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 a better curvature radius characteristic, 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 seven lenses are exemplified in the embodiment, the optical imaging lens is not limited to include seven lenses. The optical imaging lens may also include other numbers of lenses, as desired.

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

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

Example one

As shown in fig. 1 to 5, an optical imaging lens of the first example of the present application is described. Fig. 1 shows a schematic configuration diagram of an optical imaging lens of example one.

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 with negative refractive power has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the image height ImgH of the optical imaging lens is 6.55 mm. The total length TTL of the optical imaging lens is 7.83 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, and the focal length are all millimeters (mm).

TABLE 1

In the first example, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 are aspheric, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient values A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical mirrors S1-S14 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-7.6727E-04

1.0512E-02

-3.2303E-02

6.3614E-02

-8.0705E-02

6.7384E-02

-3.7297E-02

S2

-1.7423E-02

1.6238E-02

-2.1393E-02

3.8122E-02

-4.8425E-02

3.9000E-02

-1.9756E-02

S3

-1.5009E-02

1.7107E-02

9.0175E-03

-5.1781E-02

1.0214E-01

-1.2214E-01

9.3812E-02

S4

5.2042E-04

3.0233E-02

-9.4558E-02

2.8029E-01

-5.4327E-01

6.8965E-01

-5.7937E-01

S5

-2.0338E-02

-4.5631E-02

1.8846E-01

-4.5320E-01

7.1308E-01

-7.5642E-01

5.4318E-01

S6

-3.2869E-02

-2.7465E-03

2.2065E-02

-2.7665E-02

1.5656E-02

2.0907E-03

-9.5030E-03

S7

-2.8945E-02

6.6716E-03

-1.1192E-02

2.1877E-02

-2.6905E-02

2.1563E-02

-1.1426E-02

S8

-2.1173E-02

3.7152E-03

-6.4900E-04

-4.1561E-03

6.0940E-03

-4.4851E-03

2.0121E-03

S9

-4.6962E-02

1.0734E-02

3.9896E-03

-9.5192E-03

7.0501E-03

-3.1138E-03

8.9497E-04

S10

-6.9366E-02

1.7023E-02

4.9644E-04

-5.0426E-03

3.2300E-03

-1.0548E-03

1.6782E-04

S11

-2.0726E-02

-8.2850E-05

1.4819E-03

-8.7088E-04

2.3749E-04

-4.0504E-05

4.9216E-06

S12

6.5968E-03

-4.9052E-03

2.9111E-03

-1.2975E-03

3.6580E-04

-7.1262E-05

1.0215E-05

S13

-7.2486E-02

2.7845E-02

-7.2648E-03

1.3637E-03

-1.6736E-04

1.2147E-05

-3.3632E-07

S14

-7.8023E-02

2.8846E-02

-8.4222E-03

1.8472E-03

-3.0165E-04

3.6579E-05

-3.2877E-06

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.3522E-02

-3.0833E-03

4.0098E-04

-2.2689E-05

0.0000E+00

S2

6.0877E-03

-1.0282E-03

6.7447E-05

1.3581E-06

0.0000E+00

S3

-4.6335E-02

1.4231E-02

-2.4745E-03

1.8616E-04

0.0000E+00

S4

3.1962E-01

-1.1139E-01

2.2251E-02

-1.9435E-03

0.0000E+00

S5

-2.5976E-01

7.9059E-02

-1.3816E-02

1.0512E-03

0.0000E+00

S6

6.6454E-03

-2.3106E-03

4.1535E-04

-3.0850E-05

0.0000E+00

S7

3.9460E-03

-8.4729E-04

1.0224E-04

-5.2883E-06

0.0000E+00

S8

-5.7138E-04

9.9889E-05

-9.6906E-06

3.9319E-07

0.0000E+00

S9

-1.6751E-04

1.9526E-05

-1.2749E-06

3.5254E-08

0.0000E+00

S10

5.5270E-06

-8.7894E-06

2.0113E-06

-2.4710E-07

1.7896E-08

-7.2137E-10

1.2537E-11

S11

-4.4208E-07

2.9011E-08

-1.3512E-09

4.3134E-11

-9.0326E-13

1.1532E-14

-7.2482E-17

S12

-1.0948E-06

8.6722E-08

-4.9535E-09

1.9692E-10

-5.1479E-12

7.9367E-14

-5.4613E-16

S13

-2.5164E-08

3.3404E-09

-1.8511E-10

6.0998E-12

-1.2355E-13

1.4280E-15

-7.2441E-18

S14

2.1822E-07

-1.0610E-08

3.7197E-10

-9.1297E-12

1.4862E-13

-1.4397E-15

6.2752E-18

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 an astigmatism curve of the optical imaging lens of example one, which represents 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. Fig. 5 shows a chromatic aberration of magnification curve of the optical imaging lens of the first example, which represents a deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 2 to 5, the optical imaging lens according to the first example can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an optical imaging lens of example two of the present application is described. Fig. 6 shows a schematic configuration diagram of an optical imaging lens of example two.

As shown in fig. 6, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with negative refractive power has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the image height ImgH of the optical imaging lens is 6.55 mm. The total length TTL of the optical imaging lens is 7.95 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, and the focal length 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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.2740E-03

-6.5015E-04

3.5722E-03

-7.9226E-03

1.1031E-02

-1.0032E-02

6.0305E-03

S2

-1.3442E-02

3.7019E-03

2.1496E-02

-5.8293E-02

8.8069E-02

-8.6825E-02

5.7150E-02

S3

-1.2168E-02

1.2210E-02

1.8611E-02

-6.3761E-02

1.0464E-01

-1.0986E-01

7.6712E-02

S4

2.0618E-03

1.4737E-02

-1.7952E-02

5.1821E-02

-1.1508E-01

1.6391E-01

-1.5016E-01

S5

-2.5830E-02

-9.9956E-04

1.0502E-02

-1.8806E-02

1.5436E-02

-1.3271E-03

-1.0137E-02

S6

-3.3256E-02

9.3740E-03

-7.7869E-03

9.5357E-03

-9.0449E-03

5.6853E-03

-1.9393E-03

S7

-2.8078E-02

1.5371E-02

-3.0239E-02

4.5695E-02

-4.6595E-02

3.2009E-02

-1.4775E-02

S8

-2.0456E-02

1.8039E-03

2.8203E-03

-8.9338E-03

1.0552E-02

-7.3363E-03

3.2369E-03

S9

-4.0192E-02

4.5359E-03

4.4280E-03

-5.3059E-03

2.5848E-03

-6.9304E-04

8.8857E-05

S10

-5.9289E-02

8.2323E-03

6.0472E-03

-8.4243E-03

5.4548E-03

-2.2994E-03

6.7078E-04

S11

-1.9963E-02

3.8337E-04

1.0503E-03

-7.0322E-04

2.2856E-04

-5.0534E-05

8.0999E-06

S12

4.5534E-03

-3.8434E-03

2.7967E-03

-1.3921E-03

4.3437E-04

-9.3228E-05

1.4375E-05

S13

-7.0596E-02

2.4825E-02

-5.2519E-03

6.1559E-04

7.5193E-06

-1.5428E-05

2.7180E-06

S14

-7.6535E-02

2.8628E-02

-8.3627E-03

1.8003E-03

-2.8268E-04

3.2368E-05

-2.7100E-06

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.3742E-03

5.8708E-04

-8.2519E-05

5.0081E-06

0.0000E+00

S2

-2.4863E-02

6.8563E-03

-1.0845E-03

7.4844E-05

0.0000E+00

S3

-3.5329E-02

1.0302E-02

-1.7220E-03

1.2557E-04

0.0000E+00

S4

8.8600E-02

-3.2579E-02

6.8018E-03

-6.1662E-04

0.0000E+00

S5

1.0620E-02

-5.2256E-03

1.3255E-03

-1.3981E-04

0.0000E+00

S6

1.1690E-04

1.7002E-04

-6.0250E-05

6.5248E-06

0.0000E+00

S7

4.5004E-03

-8.6289E-04

9.4046E-05

-4.4377E-06

0.0000E+00

S8

-9.1317E-04

1.5866E-04

-1.5298E-05

6.1860E-07

0.0000E+00

S9

3.4537E-06

-3.0165E-06

4.0925E-07

-1.9137E-08

0.0000E+00

S10

-1.3640E-04

1.9176E-05

-1.8241E-06

1.1206E-07

-4.0142E-09

6.3743E-11

0.0000E+00

S11

-9.2139E-07

7.2485E-08

-3.8479E-09

1.3249E-10

-2.7313E-12

2.7999E-14

-7.5374E-17

S12

-1.6070E-06

1.2948E-07

-7.4053E-09

2.9231E-10

-7.5573E-12

1.1505E-13

-7.8145E-16

S13

-2.6795E-07

1.7284E-08

-7.5936E-10

2.2647E-11

-4.4036E-13

5.0482E-15

-2.5924E-17

S14

1.6594E-07

-7.3889E-09

2.3559E-10

-5.2177E-12

7.5843E-14

-6.4635E-16

2.4255E-18

TABLE 4

Fig. 7 shows on-axis chromatic aberration curves of the optical imaging lens of example two, which represent deviation of the convergence focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 8 shows astigmatism curves of the optical imaging lens of example two, which represent meridional field curvature and sagittal field curvature. Fig. 9 shows distortion curves of the optical imaging lens of example two, which indicate distortion magnitude values corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the optical imaging lens of example two, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 7 to 10, the optical imaging lens according to the second example can achieve good imaging quality.

Example III

As shown in fig. 11 to 15, an optical imaging lens of example three of the present application is described. Fig. 11 shows a schematic configuration diagram of an optical imaging lens of example three.

As shown in fig. 11, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 with negative refractive power has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

In this example, the image height ImgH of the optical imaging lens is 6.10 mm. The total length TTL of the optical imaging lens is 7.70 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, and focal length 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

7.5726E-04

2.9660E-03

-8.4548E-03

1.5678E-02

-1.8394E-02

1.4169E-02

-7.2662E-03

S2

-9.7852E-03

1.0589E-03

2.4753E-02

-6.6600E-02

1.0374E-01

-1.0482E-01

6.9943E-02

S3

-9.9003E-03

6.6304E-03

3.0433E-02

-8.8851E-02

1.4396E-01

-1.5117E-01

1.0530E-01

S4

1.9095E-03

9.4644E-03

-1.6054E-04

2.6956E-03

-1.8392E-02

3.5969E-02

-3.7496E-02

S5

-2.4541E-02

-1.8329E-03

-2.8962E-03

3.8651E-02

-1.0738E-01

1.6017E-01

-1.4807E-01

S6

-3.1678E-02

4.1601E-03

1.1804E-03

-3.8016E-03

7.8052E-03

-1.0447E-02

9.0346E-03

S7

-2.7088E-02

1.3582E-02

-3.2231E-02

5.3847E-02

-5.7312E-02

4.0013E-02

-1.8464E-02

S8

-1.9572E-02

-4.0190E-04

6.8491E-03

-1.5104E-02

1.6852E-02

-1.1499E-02

5.0311E-03

S9

-4.0415E-02

3.7824E-03

7.7012E-03

-9.5876E-03

5.4868E-03

-1.8684E-03

3.8444E-04

S10

-6.0964E-02

1.0044E-02

5.1702E-03

-7.9898E-03

5.0070E-03

-1.9660E-03

5.2640E-04

S11

-1.9320E-02

8.7773E-04

7.6894E-04

-5.4114E-04

1.3200E-04

-8.8922E-06

-3.4009E-06

S12

8.9608E-03

-5.1817E-03

3.0050E-03

-1.3872E-03

4.2774E-04

-9.1875E-05

1.4116E-05

S13

-5.8820E-02

1.6908E-02

-2.9246E-03

2.7912E-04

1.7545E-05

-1.0313E-05

1.6582E-06

S14

-5.7164E-02

1.6803E-02

-3.9713E-03

7.0206E-04

-8.9706E-05

8.0535E-06

-4.8862E-07

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

2.4544E-03

-5.2483E-04

6.4493E-05

-3.4893E-06

0.0000E+00

S2

-3.0529E-02

8.3728E-03

-1.3081E-03

8.8712E-05

0.0000E+00

S3

-4.8140E-02

1.3864E-02

-2.2787E-03

1.6282E-04

0.0000E+00

S4

2.3607E-02

-9.0246E-03

1.9418E-03

-1.8156E-04

0.0000E+00

S5

8.7629E-02

-3.2422E-02

6.8461E-03

-6.3079E-04

0.0000E+00

S6

-4.9138E-03

1.6246E-03

-2.9770E-04

2.3141E-05

0.0000E+00

S7

5.5579E-03

-1.0458E-03

1.1152E-04

-5.1463E-06

0.0000E+00

S8

-1.4117E-03

2.4418E-04

-2.3489E-05

9.5170E-07

0.0000E+00

S9

-4.2162E-05

1.0440E-06

2.3151E-07

-1.6831E-08

0.0000E+00

S10

-9.8016E-05

1.2700E-05

-1.1314E-06

6.6960E-08

-2.4084E-09

4.0421E-11

0.0000E+00

S11

1.1367E-06

-1.7249E-07

1.5772E-08

-9.1384E-10

3.2921E-11

-6.7458E-13

6.0178E-15

S12

-1.5606E-06

1.2362E-07

-6.9260E-09

2.6730E-10

-6.7520E-12

1.0042E-13

-6.6641E-16

S13

-1.5640E-07

9.7515E-09

-4.1519E-10

1.2002E-11

-2.2605E-13

2.5071E-15

-1.2438E-17

S14

1.8185E-08

-2.5933E-10

-1.0541E-11

6.8945E-13

-1.7495E-14

2.2400E-16

-1.1910E-18

TABLE 6

Fig. 12 shows on-axis chromatic aberration curves of the optical imaging lens of example three, which represent the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 13 shows astigmatism curves of the optical imaging lens of example three, which represent meridional field curvature and sagittal field curvature. Fig. 14 shows distortion curves of the optical imaging lens of example three, which represent distortion magnitude values corresponding to different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the optical imaging lens of example three, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 12 to 15, the optical imaging lens according to the third example can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an optical imaging lens of example four of the present application is described. Fig. 16 shows a schematic configuration diagram of an optical imaging lens of example four.

As shown in fig. 16, the optical imaging lens includes, in order from an object side to an image side, a stop STO, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, a filter E8, and an image plane S17.

The first lens element E1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 with negative refractive power has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 with negative refractive power has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 with positive refractive power has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 with negative refractive power has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 with positive refractive power has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 with negative refractive power has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the image height ImgH of the optical imaging lens is 6.55 mm. The total length TTL of the optical imaging lens is 7.84 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, thickness/distance, and focal length 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

6.3252E-05

4.8590E-03

-1.3509E-02

2.4635E-02

-2.8990E-02

2.2562E-02

-1.1711E-02

S2

-1.1614E-02

4.8125E-03

6.1788E-03

-2.0910E-02

3.6455E-02

-4.0957E-02

3.0001E-02

S3

-1.1120E-02

6.6783E-03

3.3661E-02

-1.0317E-01

1.7663E-01

-1.9385E-01

1.3963E-01

S4

8.8269E-04

1.7740E-02

-3.4354E-02

9.5038E-02

-1.7658E-01

2.1411E-01

-1.7148E-01

S5

-2.3602E-02

-1.2896E-02

3.4016E-02

-2.3715E-02

-5.3804E-02

1.5271E-01

-1.7948E-01

S6

-3.2552E-02

7.4729E-03

-1.7096E-02

5.0967E-02

-8.3451E-02

8.4163E-02

-5.4849E-02

S7

-2.6151E-02

7.1922E-03

-1.8444E-02

3.5376E-02

-4.0237E-02

2.9310E-02

-1.4078E-02

S8

-1.8879E-02

-2.2510E-04

2.9247E-03

-7.1402E-03

8.4658E-03

-6.0240E-03

2.7129E-03

S9

-3.9941E-02

5.5153E-03

3.9359E-03

-5.7164E-03

3.3183E-03

-1.1920E-03

2.8553E-04

S10

-6.1428E-02

1.1028E-02

3.7323E-03

-7.0096E-03

4.7876E-03

-2.0624E-03

6.0900E-04

S11

-1.9584E-02

-3.0327E-04

1.6190E-03

-1.0225E-03

3.4537E-04

-8.0531E-05

1.3747E-05

S12

6.1358E-03

-4.2768E-03

2.8214E-03

-1.3696E-03

4.2297E-04

-9.0301E-05

1.3926E-05

S13

-7.3769E-02

2.8759E-02

-7.5786E-03

1.4180E-03

-1.7023E-04

1.1471E-05

-1.6851E-07

S14

-8.0476E-02

3.1574E-02

-9.6125E-03

2.1534E-03

-3.5384E-04

4.2781E-05

-3.8195E-06

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

4.0032E-03

-8.6497E-04

1.0714E-04

-5.8149E-06

0.0000E+00

S2

-1.4187E-02

4.1705E-03

-6.9264E-04

4.9608E-05

0.0000E+00

S3

-6.5530E-02

1.9284E-02

-3.2298E-03

2.3479E-04

0.0000E+00

S4

9.0347E-02

-3.0199E-02

5.8264E-03

-4.9613E-04

0.0000E+00

S5

1.2070E-01

-4.8108E-02

1.0604E-02

-9.9894E-04

0.0000E+00

S6

2.3191E-02

-6.1346E-03

9.2213E-04

-6.0154E-05

0.0000E+00

S7

4.4236E-03

-8.7028E-04

9.6932E-05

-4.6589E-06

0.0000E+00

S8

-7.7981E-04

1.3812E-04

-1.3594E-05

5.6203E-07

0.0000E+00

S9

-4.4795E-05

4.2416E-06

-2.0237E-07

2.9090E-09

0.0000E+00

S10

-1.2466E-04

1.7554E-05

-1.6640E-06

1.0130E-07

-3.5750E-09

5.5563E-11

0.0000E+00

S11

-1.7040E-06

1.5128E-07

-9.4933E-09

4.1153E-10

-1.1752E-11

1.9941E-13

-1.5264E-15

S12

-1.5653E-06

1.2730E-07

-7.3667E-09

2.9459E-10

-7.7207E-12

1.1917E-13

-8.2069E-16

S13

-4.3962E-08

4.6480E-09

-2.4564E-10

7.9774E-12

-1.6119E-13

1.8701E-15

-9.5591E-18

S14

2.5185E-07

-1.2194E-08

4.2709E-10

-1.0507E-11

1.7196E-13

-1.6788E-15

7.3891E-18

TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve of the optical imaging lens of example four, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 18 shows astigmatism curves of the optical imaging lens of example four, which represent meridional field curvature and sagittal field curvature. Fig. 19 shows distortion curves of the optical imaging lens of example four, which represent distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the optical imaging lens of example four, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

As can be seen from fig. 17 to 20, the optical imaging lens according to example four can achieve good imaging quality.

In summary, the example one to example four satisfy the relationships shown in table 9, respectively.

Table 9 table 10 gives effective focal lengths f1 to f7 of respective lenses of the optical imaging lenses of example one to example four.

Example parameters	1	2	3	4
					f1(mm)	5.90	5.75	5.53	6.12
f2(mm)	-17.20	-14.74	-13.36	-18.54
					f3(mm)	-40.11	-44.62	-50.47	-44.52
f4(mm)	29.90	29.70	29.13	30.45
					f5(mm)	-43.76	-38.73	-35.79	-40.90
f6(mm)	7.53	7.67	7.04	7.54
					f7(mm)	-4.46	-4.58	-4.67	-4.52
f(mm)	6.89	6.97	6.53	6.90
					TTL(mm)	7.83	7.95	7.70	7.84
ImgH(mm)	6.55	6.55	6.10	6.55

Watch 10

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

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

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

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

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

Claims

1. An optical imaging lens, comprising:

the optical lens assembly comprises a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a concave image side surface and a concave image side surface, and a sixth lens element with positive refractive power, wherein the object side surface of the first lens element is convex;

a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;

a third lens element with negative refractive power;

a fourth lens element with positive refractive power;

a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;

a sixth lens element with positive refractive power having a convex object-side surface;

a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface;

the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface meet the following conditions: 4.7mm < ImgH/TTL <5.7 mm.

2. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens satisfy: 5.5mm < f tan (FOV/2) <6.7 mm.

3. The optical imaging lens of claim 1, wherein an on-axis distance TTL from an object side surface of the first lens element to the imaging plane satisfies, from the TTL, a half ImgH of a diagonal length of an effective pixel area on the imaging plane: TTL/ImgH < 1.3.

4. The optical imaging lens of claim 1, wherein an effective focal length f6 of the sixth lens and an effective focal length f1 of the first lens satisfy: 1.1< f6/f1< 1.5.

5. The optical imaging lens of claim 1, wherein the effective focal length f5 of the fifth lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: 0.4< f5/(f2+ f3) < 0.9.

6. The optical imaging lens of claim 1, wherein a radius of curvature R1 of the object-side surface of the first lens and a radius of curvature R2 of the image-side surface of the first lens satisfy: 1.4< (R2+ R1)/(R2-R1) < 2.0.

7. The optical imaging lens of claim 1, wherein a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens satisfy: 2.2< (R3+ R4)/(R3-R4) < 3.7.

8. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging 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: 2.1< (R9+ R10)/f < 2.6.

9. The optical imaging lens of claim 1, wherein a radius of curvature R13 of the object-side surface of the seventh lens and a radius of curvature R14 of the image-side surface of the seventh lens satisfy: 2.8< (R13-R14)/(R13+ R14) < 3.4.

10. An optical imaging lens, comprising:

a third lens element with negative refractive power;

a fourth lens element with positive refractive power;

the seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface;

the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens meets the requirement that the length of the diagonal ImgH of an effective pixel area on the imaging surface is half: TTL/ImgH < 1.3.