CN113433671A

CN113433671A - Optical imaging lens

Info

Publication number: CN113433671A
Application number: CN202110846898.4A
Authority: CN
Inventors: 孟祥月; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-09-24
Anticipated expiration: 2041-07-26
Also published as: CN113433671B

Abstract

The invention provides an optical imaging lens. The optical imaging lens includes: a first lens having a negative focal power; the second lens has positive 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; a third lens; a fourth lens having a positive refractive power; a fifth lens; a sixth lens having a negative focal power; the half of diagonal length ImgH of an effective pixel area on an imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens and the aperture numerical value Fno of the optical imaging lens meet the following conditions: 0.3< ImgH/(f × Fno) < 0.55; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the maximum half field angle Semi-FOV of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: 5.5< TTL tan (Semi-FOV)/EPD < 7.5. The invention solves the problem of large volume of the optical imaging lens in the prior art.

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

At present, the market of electronic products is rapidly developed, people's pursuit for the market of electronic products is no longer limited to cameras and mobile phones in the traditional sense, and people's enthusiasm for wearable devices is continuously rising in recent years. The intelligent watch is as convenient wearable equipment, not only can be reported to the police, emergency call, rhythm of the heart monitoring, also can be used to shoot, video conversation etc. is prepared for receiving people's favor, because wearable equipment volume ratio is less, the space of holding optics imaging lens is also less, but optics imaging lens volume ratio is bigger.

That is to say, the optical imaging lens in the prior art has a problem of large volume.

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 large in size.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens comprising: a first lens having a negative focal power; the second lens has positive 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; a third lens; a fourth lens having a positive refractive power; a fifth lens; a sixth lens having a negative focal power; the half of diagonal length ImgH of an effective pixel area on an imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens and the aperture numerical value Fno of the optical imaging lens meet the following conditions: 0.3< ImgH/(f × Fno) < 0.55; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the maximum half field angle Semi-FOV of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: 5.5< TTL tan (Semi-FOV)/EPD < 7.5.

Further, at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is a glass lens.

Further, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface, an aperture value Fno of the optical imaging lens, and an entrance pupil diameter EPD of the optical imaging lens satisfy: 9< TTL × Fno/EPD < 11.

Further, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: 1.8< TTL/ImgH < 2.5.

Further, the effective focal length f of the optical imaging lens, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy the following conditions: 0.3< f/(f2+ f4) < 0.65.

Further, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy: 1.5< (f2+ f4)/(f2-f4) < 4.5.

Further, the effective focal length f2 of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -2< f2/R4< 0.

Further, a radius of curvature R4 of the image-side surface of the second lens, a radius of curvature R8 of the image-side surface of the fourth lens, and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.5< (R4-R8)/(R8-R12) < 1.5.

Further, an on-axis distance BFL from an image-side surface of the sixth lens element to the imaging surface and an on-axis distance TD from an object-side surface of the first lens element to the image-side surface of the sixth lens element satisfy: 0.2< BFL/TD < 0.4.

Further, a sum Σ CT of center thicknesses on the optical axis of the first lens to the sixth lens and a sum Σ AT of air intervals on the optical axis between adjacent two lenses of the first lens to the sixth lens, respectively, satisfy: 0.2< Σ AT/Σ CT < 0.6.

Further, a sum Σ CT of center thicknesses of the first lens to the sixth lens in the optical axis of the optical imaging lens, a center thickness CT4 of the fourth lens in the optical axis, a center thickness CT5 of the fifth lens in the optical axis, and a center thickness CT6 of the sixth lens in the optical axis, respectively, satisfies: 0.55< (CT4+ CT5+ CT 6)/sigma CT < 0.7.

Further, a sum Σ AT of air intervals on the optical axis of the optical imaging lens between adjacent two lenses of the first to sixth lenses, an air interval T23 on the optical axis of the second and third lenses, and an air interval T34 on the optical axis of the third and fourth lenses satisfy: 0.2< (T23+ T34)/Σ AT < 0.6.

Further, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, the Abbe number V4 of the fourth lens and the Abbe number V5 of the fifth lens satisfy: (N4-N5)/(V4-V5) >0.

Further, the refractive index N4 of the fourth lens satisfies: n4> 1.7.

Further, the abbe number V4 of the fourth lens satisfies: 40< V4< 60.

Further, a maximum value DTmax of the maximum effective radius among the first to sixth lenses and a minimum value DTmin of the maximum effective radius among the first to sixth lenses satisfy: 3< DTmax/DTmin <4.

Further, the maximum effective radius DT11 of the object-side surface of the first lens, the maximum effective radius DT21 of the object-side surface of the second lens, the maximum effective radius DT22 of the image-side surface of the second lens, and the maximum effective radius DT32 of the image-side surface of the third lens satisfy: 0.5< (DT32-DT22)/(DT11-DT21) <2.

Further, the maximum effective radius DT42 of the image-side surface of the fourth lens, the maximum effective radius DT52 of the image-side surface of the fifth lens, and the maximum effective radius DT62 of the image-side surface of the sixth lens satisfy: 0.5< (DT62-DT52)/(DT52-DT42) < 2.5.

According to another aspect of the present invention, there is provided an optical imaging lens including: a first lens having a negative focal power; the second lens has positive 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; a third lens; a fourth lens having a positive refractive power; a fifth lens; a sixth lens having a negative focal power; the half of diagonal length ImgH of an effective pixel area on an imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens and the aperture numerical value Fno of the optical imaging lens meet the following conditions: 0.3< ImgH/(f × Fno) < 0.55; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the aperture value Fno of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: 9< TTL × Fno/EPD < 11.

Further, the refractive index N4 of the fourth lens satisfies: n4> 1.7.

Further, the abbe number V4 of the fourth lens satisfies: 40< V4< 60.

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 and a sixth lens, wherein the first lens has negative focal power; the second lens has positive 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 fourth lens has positive focal power; the sixth lens has negative focal power; the half of diagonal length ImgH of an effective pixel area on an imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens and the aperture numerical value Fno of the optical imaging lens meet the following conditions: 0.3< ImgH/(f × Fno) < 0.55; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the maximum half field angle Semi-FOV of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: 5.5< TTL tan (Semi-FOV)/EPD < 7.5.

Through the reasonable distribution of the focal power of each lens, the aberration generated by the optical imaging lens is balanced, and the imaging quality of the optical imaging lens is greatly improved. By limiting the ImgH/(f × Fno) within a reasonable range, the requirements of the optical imaging lens on high image quality and high pixel are favorably met, and the imaging definition of the optical imaging lens is increased. And TTL tan (Semi-FOV)/EPD is limited within a reasonable range, so that the optical imaging lens is more miniaturized, and the requirement of the optical imaging lens on a large field of view can be met, so that the optical imaging lens is miniaturized and the field of view of the optical imaging lens is ensured.

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 4 respectively show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve of the optical imaging lens in fig. 1;

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

fig. 6 to 8 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve of the optical imaging lens in fig. 5, respectively;

fig. 9 is a schematic structural view showing an optical imaging lens of example three of the present invention;

fig. 10 to 12 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve of the optical imaging lens in fig. 9, respectively;

fig. 13 is a schematic view showing a configuration of an optical imaging lens of example four of the present invention;

fig. 14 to 16 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 13;

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

fig. 18 to 20 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 17;

fig. 21 is a schematic structural view showing an optical imaging lens of example six of the present invention;

fig. 22 to 24 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 21;

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

fig. 26 to 28 show an on-axis chromatic aberration curve, an astigmatic curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 25;

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

fig. 30 to 32 show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens in fig. 29.

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, a filter plate; s13, the object side surface of the filter plate; s14, the image side surface of the filter plate; and S15, imaging surface.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

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

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

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

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

The invention provides an optical imaging lens, aiming at solving the problem that the optical imaging lens in the prior art is large in size.

As shown in fig. 1 to 32, the optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, the first lens having a negative power; the second lens has positive 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 fourth lens has positive focal power; the sixth lens has negative focal power; the half of diagonal length ImgH of an effective pixel area on an imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens and the aperture numerical value Fno of the optical imaging lens meet the following conditions: 0.3< ImgH/(f × Fno) < 0.55; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the maximum half field angle Semi-FOV of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: 5.5< TTL tan (Semi-FOV)/EPD < 7.5.

Preferably, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens, and the aperture value Fno of the optical imaging lens satisfy: 0.32< ImgH/(f × Fno) < 0.53; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the maximum half field angle Semi-FOV of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: 5.6< TTL tan (Semi-FOV)/EPD < 7.2. In this embodiment, at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is a glass lens. At least one of the six lenses is a glass lens, so that the compound chromatic aberration can be corrected, the temperature drift can be eliminated, and the imaging quality of the optical imaging lens can be improved.

In this embodiment, an on-axis distance TTL from the object-side surface of the first lens element to the imaging surface, an aperture value Fno of the optical imaging lens, and an entrance pupil diameter EPD of the optical imaging lens satisfy: 9< TTL × Fno/EPD < 11. By limiting the range of TTL Fno/EPD within a reasonable range, the high imaging quality of the optical imaging lens can be ensured, and the imaging quality of the optical imaging lens is ensured while the optical imaging lens is made smaller. Preferably, 9.2< TTL × Fno/EPD < 10.9.

In this embodiment, the on-axis distance TTL from the object side surface of the first lens element to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: 1.8< TTL/ImgH < 2.5. By limiting TTL/ImgH within a reasonable range, miniaturization of the optical imaging lens is facilitated, so that the optical imaging lens is adapted to the wearable device. Preferably, 1.9< TTL/ImgH < 2.3.

In the present embodiment, the effective focal length f of the optical imaging lens, the effective focal length f2 of the second lens, and the effective focal length f4 of the fourth lens satisfy: 0.3< f/(f2+ f4) < 0.65. By limiting f/(f2+ f4) within a reasonable range, the proportion of the effective focal lengths of the second lens and the fourth lens in the effective focal length of the optical imaging lens is effectively controlled, and the optical power of the optical imaging lens is favorably and reasonably distributed and the aberration of the optical imaging lens is balanced. Preferably, 0.32< f/(f2+ f4) < 0.64.

In the present embodiment, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy: 1.5< (f2+ f4)/(f2-f4) < 4.5. By limiting (f2+ f4)/(f2-f4) within a reasonable range, the effective focal lengths of the second lens and the fourth lens are limited, which is beneficial to eliminating the vertical axis aberration of the optical imaging lens and increasing the imaging quality of the optical imaging lens. Preferably 1.8< (f2+ f4)/(f2-f4) < 4.2.

In the present embodiment, the effective focal length f2 of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -2< f2/R4< 0. By limiting f2/R4 within a reasonable range, the shape of the second lens is limited, off-axis curvature of field is eliminated, imaging quality of the optical imaging lens is improved, and meanwhile manufacturing of the second lens is facilitated. Preferably, -1.9< f2/R4< -0.5.

In the present embodiment, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R8 of the image-side surface of the fourth lens, and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.5< (R4-R8)/(R8-R12) < 1.5. By limiting (R4-R8)/(R8-R12) to a reasonable range, it is advantageous to distribute the optical power of the optical imaging lens reasonably and to be able to correct the chromatic aberration effectively. Preferably, 0.6< (R4-R8)/(R8-R12) < 1.5.

In this embodiment, an on-axis distance BFL from the image-side surface of the sixth lens element to the imaging surface and an on-axis distance TD from the object-side surface of the first lens element to the image-side surface of the sixth lens element satisfy: 0.2< BFL/TD < 0.4. By limiting the BFL/TD within a reasonable range, the optical imaging lens is miniaturized and the requirements of the optical imaging lens on processing and production are met. Preferably, 0.2< BFL/TD < 0.39.

In the present embodiment, a sum Σ CT of center thicknesses on the optical axis of the first to sixth lenses and a sum Σ AT of air intervals on the optical axis between adjacent two lenses of the first to sixth lenses, respectively, satisfy: 0.2< Σ AT/Σ CT < 0.6. By limiting the sigma-delta AT/sigma CT within a reasonable range, the optical power of the optical imaging lens is favorably and reasonably distributed, the imaging quality of the optical imaging lens is ensured, and the optical imaging lens can meet the requirement of high image quality. Preferably, 0.21< Σ AT/Σ CT < 0.58.

In the present embodiment, the sum Σ CT of the center thicknesses of the first lens to the sixth lens in the optical axis of the optical imaging lens, the center thickness CT4 of the fourth lens in the optical axis, the center thickness CT5 of the fifth lens in the optical axis, and the center thickness CT6 of the sixth lens in the optical axis, respectively, satisfies: 0.55< (CT4+ CT5+ CT 6)/sigma CT < 0.7. By limiting (CT4+ CT5+ CT6)/Σ CT within a reasonable range, a reasonable distribution of the powers of the fourth lens, the fifth lens, and the sixth lens is facilitated, facilitating correction of the chromatic aberration. Preferably, 0.57< (CT4+ CT5+ CT6)/Σ CT < 0.67.

In the present embodiment, a sum Σ AT of air intervals on the optical axis of the optical imaging lens between adjacent two lenses of the first to sixth lenses, an air interval T23 on the optical axis of the second and third lenses, and an air interval T34 on the optical axis of the third and fourth lenses satisfies: 0.2< (T23+ T34)/Σ AT < 0.6. By limiting (T23+ T34)/Sigma AT within a reasonable range, the axial chromatic aberration of the optical imaging lens is favorably corrected, the imaging distortion is reduced, and the imaging quality of the optical imaging lens is improved. Preferably, 0.23< (T23+ T34)/Σ AT < 0.58.

In the present embodiment, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, the abbe number V4 of the fourth lens, and the abbe number V5 of the fifth lens satisfy: (N4-N5)/(V4-V5) >0. By limiting (N4-N5)/(V4-V5) within a reasonable range, the refractive indexes and Abbe numbers of the fourth lens and the fifth lens are effectively limited, which is beneficial to reasonably distributing the focal power of the optical imaging lens, correcting the complex chromatic aberration of the optical imaging lens and reducing the influence of ghost images. Preferably, (N4-N5)/(V4-V5) > 0.002.

In the present embodiment, the refractive index N4 of the fourth lens satisfies: n4> 1.7. Limiting the refractive index of the fourth lens to be in a range greater than 1.7 is advantageous for balancing monochromatic aberrations of the front and rear lenses of the fourth lens.

In the present embodiment, the abbe number V4 of the fourth lens satisfies: 40< V4< 60. The Abbe number of the fourth lens is limited within a reasonable range, so that the chromatic aberration of the optical imaging lens is balanced, and the imaging quality of the optical imaging lens is ensured.

In the present embodiment, a maximum value DTmax of the maximum effective radius among the first to sixth lenses and a minimum value DTmin of the maximum effective radius among the first to sixth lenses satisfy: 3< DTmax/DTmin <4. By limiting the DTmax/DTmin within a reasonable range, the maximum effective radius and the minimum effective radius of the optical imaging lens are limited, and the influence of ghost images is effectively reduced while the processing and production are ensured. Preferably 3.2< DTmax/DTmin < 3.95.

In the present embodiment, the maximum effective radius DT11 of the object-side surface of the first lens, the maximum effective radius DT21 of the object-side surface of the second lens, the maximum effective radius DT22 of the image-side surface of the second lens, and the maximum effective radius DT32 of the image-side surface of the third lens satisfy: 0.5< (DT32-DT22)/(DT11-DT21) <2. By limiting (DT32-DT22)/(DT11-DT21) within a reasonable range, the shapes of the second lens and the third lens are effectively limited, which is beneficial to the processing of the optical imaging lens and is beneficial to the correction of off-axis curvature of field. Preferably, 0.6< (DT32-DT22)/(DT11-DT21) < 1.95.

In the present embodiment, the maximum effective radius DT42 of the image-side surface of the fourth lens, the maximum effective radius DT52 of the image-side surface of the fifth lens, and the maximum effective radius DT62 of the image-side surface of the sixth lens satisfy: 0.5< (DT62-DT52)/(DT52-DT42) < 2.5. By limiting (DT62-DT52)/(DT52-DT42) within a reasonable range, the size of the optical imaging lens is effectively limited, and the processing manufacturability requirement is ensured. Preferably, 0.6< (DT62-DT52)/(DT52-DT42) < 2.4.

Example two

As shown in fig. 1 to 32, the optical imaging lens includes: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens has negative focal power; the second lens has positive 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 fourth lens has positive focal power; the sixth lens has negative focal power; the half of diagonal length ImgH of an effective pixel area on an imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens and the aperture numerical value Fno of the optical imaging lens meet the following conditions: 0.3< ImgH/(f × Fno) < 0.55; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the aperture value Fno of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: 9< TTL × Fno/EPD < 11.

Through the reasonable distribution of the focal power of each lens, the aberration generated by the optical imaging lens is balanced, and the imaging quality of the optical imaging lens is greatly improved. By limiting the ImgH/(f × Fno) within a reasonable range, the requirements of the optical imaging lens on high image quality and high pixel are favorably met, and the imaging definition of the optical imaging lens is increased. By limiting the range of TTL Fno/EPD within a reasonable range, the high imaging quality of the optical imaging lens can be ensured, and the imaging quality of the optical imaging lens is ensured while the optical imaging lens is made smaller. Preferably, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens, and the aperture value Fno of the optical imaging lens satisfy: 0.32< ImgH/(f × Fno) < 0.53; the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the aperture value Fno of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following requirements: 9.2< TTL × Fno/EPD < 10.9.

In this embodiment, at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is a glass lens. At least one of the six lenses is a glass lens, so that the compound chromatic aberration can be corrected, the temperature drift can be eliminated, and the imaging quality of the optical imaging lens can be 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-mentioned six 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 six lenses are exemplified in the embodiment, the optical imaging lens is not limited to include six 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 view 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: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative 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 positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. The third lens element E3 has negative 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 E5 has negative power, and the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is concave. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 1.91mm, the total length TTL of the optical imaging lens is 4.26mm, and the image height ImgH is 2.13 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 through the sixth lens element E6 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 that can be used for each of the aspherical mirrors S1-S12 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 a chromatic aberration of magnification curve of the optical imaging lens of the first example, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging lens.

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 structural diagram of an optical imaging lens of example two.

As shown in fig. 5, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative 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 positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. The third lens element E3 has negative 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 and the image-side surface S8 of the fourth lens element are convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 2.41mm, the total length TTL of the optical imaging lens is 3.99mm, and the image height ImgH is 2.04 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 two above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.7460E-01

2.6817E-01

3.7422E-01

-2.7382E+00

7.2374E+00

-8.8407E+00

4.1326E+00

0.0000E+00

S2

3.3019E-01

-2.3667E+00

1.7213E+01

-7.6785E+01

2.3690E+02

-4.2789E+02

3.9343E+02

0.0000E+00

S3

-5.2173E-02

-1.2466E+00

9.2661E+00

-7.4766E+00

-8.2256E+02

8.8489E+03

-4.2500E+04

1.0069E+05

-9.5193E+04

S4

-9.5268E-01

2.2637E+00

-1.3173E+01

7.4328E+01

-3.4841E+02

1.1808E+03

-2.5908E+03

3.2331E+03

-1.7156E+03

S5

-5.5032E-01

-3.9912E-01

3.5272E+00

-1.9175E+01

7.9453E+01

-1.9347E+02

2.6722E+02

-1.9554E+02

5.8503E+01

S6

-5.8220E-02

-8.4319E-01

3.8029E+00

-1.3836E+01

3.7298E+01

-6.4297E+01

6.7341E+01

-3.9160E+01

9.6490E+00

S7

-3.7677E-02

2.7699E-02

-2.2535E-01

-1.1983E-01

-4.0801E-01

3.3482E+00

-4.5635E+00

2.2838E+00

-3.5492E-01

S8

6.1357E-02

-4.3140E-01

1.3411E+00

-2.3373E+00

2.6238E+00

-2.1571E+00

1.3773E+00

-5.8426E-01

1.1456E-01

S9

-2.4958E-02

-5.6563E-01

1.2764E+00

-1.0008E+00

2.2224E-01

1.0665E-01

-5.8145E-02

0.0000E+00

S10

2.8699E-02

-1.8035E-01

8.8428E-02

4.0321E-01

-5.4103E-01

2.5253E-01

-4.1409E-02

0.0000E+00

S11

-9.0488E-01

1.8513E+00

-3.0928E+00

3.5115E+00

-2.4712E+00

1.0441E+00

-2.4587E-01

2.5869E-02

-2.9772E-04

S12

-3.3984E-01

5.6777E-01

-7.3163E-01

6.4460E-01

-3.8153E-01

1.4904E-01

-3.6965E-02

5.2732E-03

-3.2928E-04

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 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 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: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative 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 positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. 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 and the image-side surface S8 of the fourth lens element are convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 2.23mm, the total length TTL of the optical imaging lens is 4.09mm, and the image height ImgH is 2.00 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 three 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 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. 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 describing example four of the present application fig. 13 shows a schematic view of the 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: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is convex. The second lens element E2 has positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. The third lens element E3 has negative 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 and the image-side surface S8 of the fourth lens element are convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 2.14mm, the total length TTL of the optical imaging lens is 4.34mm, and the image height ImgH is 2.03 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 four above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-4.6731E-02

4.5482E-01

-1.3980E+00

3.1383E+00

-4.6717E+00

4.0674E+00

-1.5655E+00

0.0000E+00

S2

2.0016E-01

-2.7938E-02

-1.0773E+00

1.7326E+01

-1.0074E+02

2.6064E+02

-2.5546E+02

0.0000E+00

S3

-5.3061E-02

2.1215E+00

-7.6856E+01

1.1316E+03

-9.9020E+03

5.3030E+04

-1.7046E+05

3.0154E+05

-2.2552E+05

S4

-7.7384E-01

1.0287E+00

-6.5415E+00

5.7738E+01

-3.6447E+02

1.3956E+03

-3.1363E+03

3.7956E+03

-1.9101E+03

S5

-6.1529E-01

3.1420E-01

-1.7328E+00

1.4937E+01

-7.7840E+01

2.4399E+02

-4.5471E+02

4.5989E+02

-1.9562E+02

S6

1.1940E-01

-1.4430E+00

7.2349E+00

-2.6396E+01

6.5973E+01

-1.0921E+02

1.1285E+02

-6.4985E+01

1.5713E+01

S7

2.5742E-02

-5.2479E-01

2.6013E+00

-9.1086E+00

2.2030E+01

-3.7696E+01

4.2649E+01

-2.7215E+01

7.2145E+00

S8

2.5631E-02

-5.1135E-01

1.7997E+00

-1.8571E+00

-1.0341E+00

4.1555E+00

-4.0176E+00

1.7946E+00

-3.1961E-01

S9

3.7966E-01

-3.9169E+00

1.7483E+01

-4.1424E+01

6.0736E+01

-5.6934E+01

3.3048E+01

-1.0705E+01

1.4420E+00

S10

-3.1499E-01

2.6584E-01

1.5448E+00

-4.4196E+00

5.9068E+00

-4.5707E+00

2.0610E+00

-5.0097E-01

5.0727E-02

S11

-9.0275E-01

1.1908E+00

-1.3619E+00

1.3092E+00

-9.6126E-01

5.0656E-01

-1.7579E-01

3.5180E-02

-3.0426E-03

S12

-7.1241E-01

9.8102E-01

-1.0222E+00

7.8935E-01

-4.4178E-01

1.7174E-01

-4.3655E-02

6.4844E-03

-4.2454E-04

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 a chromatic aberration of magnification curve of the optical imaging lens of example four, 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. 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 view of the 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: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. The third lens element E3 has negative 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 and the image-side surface S8 of the fourth lens element are convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 1.93mm, the total length TTL of the optical imaging lens is 4.39mm, and the image height ImgH is 2.00 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 five above.

Watch 10

Fig. 18 shows an on-axis chromatic aberration curve of the optical imaging lens of example five, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 19 shows astigmatism curves of the optical imaging lens of example five, which represent meridional field curvature and sagittal field curvature. Fig. 20 shows a chromatic aberration of magnification curve of the optical imaging lens of example five, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens.

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 view of the 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: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative 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 positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. The third lens element E3 has negative 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 and the image-side surface S8 of the fourth lens element are convex. The fifth lens E5 has negative power, and the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is concave. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 2.07mm, the total length TTL of the optical imaging lens is 4.14mm, and the image height ImgH is 2.00 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 aspherical mirror surface in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example six above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

5.2268E-02

9.0430E-02

4.7521E-01

-2.9929E+00

7.4551E+00

-8.9092E+00

4.2629E+00

0.0000E+00

S2

2.9935E-01

2.2258E-01

-3.5589E-01

7.0228E+00

-2.9243E+01

5.5033E+01

-1.7187E+01

0.0000E+00

S3

-1.4425E-01

3.6769E+00

-9.0487E+01

1.1961E+03

-9.6490E+03

4.7968E+04

-1.4302E+05

2.3331E+05

-1.5917E+05

S4

-6.2628E-01

1.1536E-02

3.2099E+00

-3.1937E+01

1.5898E+02

-5.1261E+02

1.0669E+03

-1.3255E+03

7.3222E+02

S5

-5.6978E-01

-6.0615E-01

3.8011E+00

-1.1464E+01

1.2116E+01

2.6789E+01

-9.9971E+01

1.1666E+02

-4.8432E+01

S6

3.3516E-01

-3.0165E+00

1.0326E+01

-2.2316E+01

2.9807E+01

-2.3310E+01

9.6832E+00

-1.5217E+00

-1.1769E-01

S7

8.2520E-02

-2.7308E-01

-2.5420E+00

1.7035E+01

-4.8127E+01

7.5529E+01

-6.7727E+01

3.2513E+01

-6.5056E+00

S8

-1.5106E-01

7.1032E-01

-1.9196E+00

4.1137E+00

-6.0897E+00

6.0444E+00

-3.9604E+00

1.5835E+00

-2.8942E-01

S9

-3.8564E-01

8.3804E-01

-5.1713E-01

2.0568E-01

-3.8239E-01

3.9073E-01

-1.2753E-01

0.0000E+00

S10

-5.8499E-01

1.5422E+00

-1.9970E+00

1.5968E+00

-7.8100E-01

2.1105E-01

-2.3992E-02

0.0000E+00

S11

-1.1348E+00

1.9624E+00

-2.0437E+00

9.9040E-01

1.2264E-01

-3.9382E-01

1.9318E-01

-4.1364E-02

3.3683E-03

S12

-7.1216E-01

1.2389E+00

-1.4822E+00

1.2043E+00

-6.6630E-01

2.4693E-01

-5.8643E-02

8.0646E-03

-4.8872E-04

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 a chromatic aberration of magnification curve of the optical imaging lens of example six, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens.

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 view of the 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: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is convex. The second lens element E2 has positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. The third lens E3 has negative power, and the object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is concave. The fourth lens element E4 has positive refractive power, and the object-side surface S7 of the fourth lens element is 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 and the image-side surface S10 of the fifth lens element are convex surfaces. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 1.83mm, the total length TTL of the optical imaging lens is 4.05mm, and the image height ImgH is 1.99 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 aspherical mirror surface in example seven, wherein each aspherical mirror surface type can be defined by formula (1) given in example seven 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 a chromatic aberration of magnification curve of the optical imaging lens of example seven, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens.

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 view 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: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and the object-side surface S1 of the first lens element is concave, and the image-side surface S2 of the first lens element is concave. The second lens element E2 has positive refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens element are convex. 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 and the image-side surface S8 of the fourth lens element are convex. The fifth lens element E5 has negative power, and the object-side surface S9 of the fifth lens element is concave, and the image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is convex and the image-side surface S12 of the sixth lens element is concave. Filter E7 has an object side S13 and an image side S14 of the filter. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 2.11mm, the total length TTL of the optical imaging lens is 4.33mm, and the image height ImgH is 2.00 mm.

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

Watch 15

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

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.1519E-02

-5.3867E-04

2.1987E-01

-1.0751E+00

2.3978E+00

-2.4362E+00

9.3490E-01

0.0000E+00

S2

3.5309E-02

8.3880E-02

1.0089E+00

1.4873E+00

-3.4559E+01

1.1763E+02

-1.1745E+02

0.0000E+00

S3

8.4336E-02

-6.0220E-01

-3.8086E+01

6.8758E+02

-6.3385E+03

3.4461E+04

-1.1115E+05

1.9666E+05

-1.4711E+05

S4

-9.0520E-01

1.4501E+00

-8.1746E+00

5.9232E+01

-3.5624E+02

1.4258E+03

-3.5020E+03

4.7356E+03

-2.6951E+03

S5

-5.3788E-01

7.2752E-01

-8.6941E+00

5.8683E+01

-2.4035E+02

6.2667E+02

-1.0124E+03

9.1934E+02

-3.5909E+02

S6

1.1573E-02

1.5980E-01

-3.7567E+00

2.0769E+01

-6.8162E+01

1.4501E+02

-1.9395E+02

1.4589E+02

-4.6483E+01

S7

-8.3310E-02

6.1811E-01

-4.5152E+00

2.4402E+01

-8.9673E+01

2.0496E+02

-2.7656E+02

2.0075E+02

-6.0186E+01

S8

-1.5830E-01

3.3741E-01

2.4501E-01

-2.1472E+00

2.8039E+00

1.2251E+00

-5.3726E+00

4.0402E+00

-9.7063E-01

S9

-6.5544E-02

-7.4780E-01

8.8294E+00

-3.6169E+01

8.1569E+01

-1.0789E+02

8.3505E+01

-3.5191E+01

6.2495E+00

S10

-2.7202E-01

9.1717E-01

-9.6129E-01

-1.0794E+00

4.4401E+00

-5.3201E+00

3.1357E+00

-9.2768E-01

1.1033E-01

S11

-6.3241E-01

8.3814E-01

-1.6604E+00

2.2592E+00

-1.8061E+00

8.7372E-01

-2.5467E-01

4.1502E-02

-2.9296E-03

S12

-4.3894E-01

2.8331E-01

-1.5656E-01

1.3434E-01

-1.2134E-01

7.1122E-02

-2.4479E-02

4.5361E-03

-3.4961E-04

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 a chromatic aberration of magnification curve of the optical imaging lens of example eight, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens.

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

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

TABLE 17

Table 18 gives effective focal lengths f of the optical imaging lenses of example one to example eight, and effective focal lengths f1 to f6 of the respective lenses.

Example parameters	1	2	3	4	5	6	7	8
									f1(mm)	-7.02	-5.47	-3.93	-29.57	-3.39	-4.44	-6.26	-4.67
f2(mm)	2.88	2.67	2.53	4.74	2.19	2.76	2.21	2.65
									f3(mm)	-13.21	-16.17	280.56	-30.35	-7.13	-28.09	-7.02	745.69
f4(mm)	1.07	1.49	1.40	1.42	1.24	1.35	1.34	1.44
									f5(mm)	-9.14	-5.01	-5.81	-2.88	-2.90	-3.06	14.41	-2.73
f6(mm)	-1.60	-1.92	-1.82	-12.33	-7.34	-4.63	-1.50	-57.51
									f(mm)	1.91	2.41	2.23	2.14	1.93	2.07	1.83	2.11
TTL(mm)	4.26	3.99	4.09	4.34	4.39	4.14	4.05	4.33
									ImgH(mm)	2.13	2.04	2.00	2.03	2.00	2.00	1.99	2.00
N4	1.77	1.77	1.77	1.77	1.77	1.77	1.77	1.77
									V4	49.60	49.60	49.60	49.60	49.60	49.60	49.60	49.60

Watch 18

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

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

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

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

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

Claims

1. An optical imaging lens, comprising:

a first lens having a negative optical power;

the second lens has positive 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;

a third lens;

a fourth lens having a positive optical power;

a fifth lens;

a sixth lens having a negative optical power;

the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, the effective focal length f of the optical imaging lens and the aperture value Fno of the optical imaging lens satisfy the following conditions: 0.3< ImgH/(f × Fno) < 0.55;

the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the maximum half field angle Semi-FOV of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following conditions: 5.5< TTL tan (Semi-FOV)/EPD < 7.5.

2. The optical imaging lens according to claim 1, characterized in that at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is a glass lens.

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 surface, an aperture value Fno of the optical imaging lens, and an entrance pupil diameter EPD of the optical imaging lens satisfy: 9< TTL × Fno/EPD < 11.

4. 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 and an ImgH that is half a diagonal length of an effective pixel area on the imaging plane satisfy: 1.8< TTL/ImgH < 2.5.

5. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy: 0.3< f/(f2+ f4) < 0.65.

6. The optical imaging lens of claim 1, wherein an effective focal length f2 of the second lens and an effective focal length f4 of the fourth lens satisfy: 1.5< (f2+ f4)/(f2-f4) < 4.5.

7. The optical imaging lens of claim 1, wherein an effective focal length f2 of the second lens and a radius of curvature R4 of an image side surface of the second lens satisfy: -2< f2/R4< 0.

8. The optical imaging lens of claim 1, wherein a radius of curvature R4 of the image-side surface of the second lens, a radius of curvature R8 of the image-side surface of the fourth lens, and a radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.5< (R4-R8)/(R8-R12) < 1.5.

9. The optical imaging lens of claim 1, wherein an on-axis distance BFL from an image-side surface of the sixth lens to the imaging surface and an on-axis distance TD from an object-side surface of the first lens to the image-side surface of the sixth lens satisfy: 0.2< BFL/TD < 0.4.

10. An optical imaging lens, comprising:

a first lens having a negative optical power;

a third lens;

a fourth lens having a positive optical power;

a fifth lens;

a sixth lens having a negative optical power;

the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the aperture value Fno of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the following conditions: 9< TTL × Fno/EPD < 11.