CN112731624A

CN112731624A - Optical imaging lens

Info

Publication number: CN112731624A
Application number: CN202110002730.5A
Authority: CN
Inventors: 朱晓晓; 陈晨; 徐武超; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-01-04
Filing date: 2021-01-04
Publication date: 2021-04-30
Anticipated expiration: 2041-01-04
Also published as: CN112731624B

Abstract

The invention discloses an optical imaging lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having a positive optical power; the image side surface of the second lens is a concave surface; a third lens having a refractive power, an object-side surface of which is convex; a fourth lens having a negative refractive power, an object-side surface of which is concave; a fifth lens having a positive optical power; and a sixth lens having a negative optical power; wherein, half ImgH of diagonal length of effective pixel area on the imaging surface, entrance pupil diameter EPD of the optical imaging lens and effective focal length f of the optical imaging lens satisfy: 2.8mm < ImgH × EPD/f <4.0 mm. The optical imaging lens provided by the invention can effectively balance the low-order aberration of the system and reduce the sensitivity of tolerance by reasonably distributing the focal power of each group of the system, and can enable the imaging system to have the characteristics of large image plane and large aperture by restricting the half of the diagonal length of the effective pixel area on the imaging plane and the F number of the system within a certain range.

Description

Optical imaging lens

Technical Field

The invention belongs to the field of optical imaging, and particularly relates to an optical imaging lens comprising six lenses.

Background

With the vigorous development of the field of mobile phone camera shooting, smart phone manufacturers put higher demands on mobile phone lenses, and high-end mobile phone imaging lenses increasingly have a development trend of large image planes, large apertures, small heads and high pixels, which also puts higher difficulty challenges on optical design.

Therefore, in order to better meet the application requirements of the next-generation intelligent flagship mobile phone, a six-piece optical imaging system with miniaturization, large image plane and large aperture is needed, and the imaging quality is good.

Disclosure of Invention

The invention aims to provide an optical imaging lens consisting of six lenses, which has the performances of large image plane, large aperture, miniaturization, high imaging quality and the like.

One aspect of the present invention provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; the image side surface of the second lens is a concave surface; a third lens having a refractive power, an object-side surface of which is convex; a fourth lens having a negative refractive power, an object-side surface of which is concave; a fifth lens having a positive optical power; and a sixth lens having a negative optical power.

Wherein, half ImgH of diagonal length of effective pixel area on the imaging surface, entrance pupil diameter EPD of the optical imaging lens and effective focal length f of the optical imaging lens satisfy: 2.8mm < ImgH × EPD/f <4.0 mm.

According to one embodiment of the present invention, an on-axis distance TTL from an object-side surface of the first lens to an imaging surface and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.35.

According to one embodiment of the present invention, ImgH, which is half the diagonal length of the effective pixel region on the imaging plane, and TTL, which is the on-axis distance from the object-side surface of the first lens to the imaging plane, satisfy: 4.0mm < ImgH × ImgH/TTL <6.0 mm.

According to one embodiment of the present invention, the effective focal length f4 of the fourth lens, the effective focal length f2 of the second lens, and the effective focal length f6 of the sixth lens satisfy: 0.8< f4/(f2+ f6) < 2.6.

According to one embodiment of the invention, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy: 1.6< (R1+ R2)/f1< 2.2.

According to one embodiment of the present invention, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R10 of the image-side surface of the fifth lens, and the effective focal length f5 of the fifth lens satisfy: 2.6< (R9+ R10)/f5< 4.1.

According to one embodiment of the present invention, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, and the radius of curvature R5 of the object-side surface of the third lens satisfy: 0.1< (R3+ R4)/R5< 1.0.

According to one embodiment of the present invention, the on-axis distance TTL of the object-side surface of the first lens to the imaging surface, the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens on the optical axis, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 2.8< TTL/(CT4+ CT5+ CT6) < 3.4.

According to one embodiment of the present invention, the combined focal length f12 of the first and second lenses, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 6.0< f12/(CT1+ CT2) < 7.0.

According to one embodiment of the present invention, the edge thickness ET6 of the sixth lens, the edge thickness ET2 of the second lens, and the edge thickness ET5 of the fifth lens satisfy: 1.0< ET6/(ET2+ ET5) < 1.7.

According to one embodiment of the invention, the air space T23 between the second lens and the third lens on the optical axis and the axial distance SAG22 between the intersection point of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens satisfy that: 2.2< T23/SAG22< 3.1.

According to one embodiment of the present invention, an on-axis distance SAG52 between an intersection point of the fifth lens image-side surface and the optical axis to an effective radius vertex of the fifth lens image-side surface and an on-axis distance SAG51 between an intersection point of the fifth lens object-side surface and the optical axis to an effective radius vertex of the fifth lens object-side surface satisfy: 1.7< SAG52/SAG51< 2.5.

According to one embodiment of the present invention, an on-axis distance SAG41 between an intersection of the fourth lens object-side surface and the optical axis to an effective radius vertex of the fourth lens object-side surface and an on-axis distance SAG31 between an intersection of the third lens object-side surface and the optical axis to an effective radius vertex of the third lens object-side surface satisfy: 1.6< SAG41/SAG31< 3.4.

According to one embodiment of the present invention, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.9.

Another aspect of the present invention provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; the image side surface of the second lens is a concave surface; a third lens having a refractive power, an object-side surface of which is convex; a fourth lens having a negative refractive power, an object-side surface of which is concave; a fifth lens having a positive optical power; and a sixth lens having a negative optical power.

Wherein, each lens is independent, and there is air space on the optical axis between each lens; half of the diagonal length ImgH of the effective pixel area on the imaging surface, the entrance pupil diameter EPD of the optical imaging lens and the effective focal length f of the optical imaging lens satisfy: 2.8mm < ImgH × EPD/f <4.0 mm; the effective focal length f4 of the fourth lens, the effective focal length f2 of the second lens and the effective focal length f6 of the sixth lens satisfy: 0.8< f4/(f2+ f6) < 2.6.

The invention has the beneficial effects that:

the optical imaging lens provided by the invention comprises a plurality of lenses, such as a first lens to a sixth lens. The optical power of each group of elements of the system is reasonably distributed, so that the low-order aberration of the system can be effectively balanced, the sensitivity of tolerance is reduced, and the imaging system has the characteristics of large image surface and large aperture by restraining half of the diagonal length of an effective pixel area on the imaging surface and the F number of the system within a certain range.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a lens assembly of an optical imaging lens system according to embodiment 1 of the present invention;

fig. 2a to 2d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a lens assembly according to embodiment 2 of the present invention;

fig. 4a to 4d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, according to an optical imaging lens of embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of a lens assembly according to embodiment 3 of the present invention;

fig. 6a to 6d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to embodiment 3 of the present invention;

FIG. 7 is a schematic diagram of a lens assembly according to embodiment 4 of the present invention;

fig. 8a to 8d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to embodiment 4 of the present invention;

FIG. 9 is a schematic diagram of a lens assembly of an optical imaging lens system according to embodiment 5 of the present invention;

fig. 10a to 10d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to embodiment 5 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present 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 invention.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

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.

In the description of the present invention, 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 closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

Unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Exemplary embodiments

The optical imaging lens according to an exemplary embodiment of the present invention includes six lenses, in order from an object side to an image side along an optical axis: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the lenses are independent from each other, and an air space is formed between the lenses on an optical axis.

In the present exemplary embodiment, the first lens has positive optical power; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens can have positive focal power or negative focal power, and the object side surface of the third lens is a convex surface; the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface; the fifth lens has positive focal power; the sixth lens has a negative power. By reasonably distributing the focal powers of all the components of the system, the low-order aberration of the system can be effectively balanced, and the tolerance sensitivity is reduced.

In the present exemplary embodiment, the conditional expression that half the diagonal length ImgH of the effective pixel area on the imaging plane, the entrance pupil diameter EPD of the optical imaging lens, and the effective focal length f of the optical imaging lens satisfy is: 2.8mm < ImgH × EPD/f <4.0 mm. By restraining half of the diagonal length of the effective pixel area on the imaging surface and the F number of the system within a certain range, the imaging system has the characteristics of large image surface and large aperture. More specifically, ImgH, EPD and f satisfy: 2.81mm < ImgH × EPD/f <2.86 mm.

In the present exemplary embodiment, the conditional expression that 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 is: TTL/ImgH < 1.35. By restricting the ratio of the distance from the object side surface of the first lens to the imaging surface on the axis to the half of the diagonal length of the effective pixel area on the imaging surface, the total size of the camera lens group can be effectively reduced, and the ultra-thin characteristic and the miniaturization of the camera lens group are realized. More specifically, TTL and ImgH satisfy: 1.28< TTL/ImgH < 1.31.

In the present exemplary embodiment, the conditional expression that half ImgH of the diagonal length of the effective pixel region on the imaging plane and the on-axis distance TTL from the object-side surface of the first lens to the imaging plane satisfy is: 4.0mm < ImgH × ImgH/TTL <6.0 mm. By limiting the on-axis distance from the object side surface of the first lens to the imaging surface and the half of the diagonal length of the effective pixel area on the imaging surface within a certain range, the optical imaging system can be simultaneously ultrathin and have high pixel performance. More specifically, ImgH and TTL satisfy: 4.02mm < ImgH × ImgH/TTL <4.15 mm.

In the present exemplary embodiment, the effective focal length f4 of the fourth lens, the effective focal length f2 of the second lens, and the effective focal length f6 of the sixth lens satisfy the conditional expression: 0.8< f4/(f2+ f6) < 2.6. Through restraining the effective focal lengths of the second lens and the sixth lens and the effective focal length of the fourth lens, the focal length is reasonably distributed, so that good imaging quality is obtained, and the effect of high resolving power is realized. More specifically, f4, f2 and f6 satisfy: 0.89< f4/(f2+ f6) < 2.48.

In the present exemplary embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy the conditional expression: 1.6< (R1+ R2)/f1< 2.2. By restricting the ratio of the sum of the curvature radii of the object side surface and the image side surface of the first lens to the effective focal length within a certain range, the diopter of the incident light of the system on the first lens can be effectively controlled, the optical distortion is reduced, and the system has good imaging quality on the axis. More specifically, R1, R2 and f1 satisfy: 1.74< (R1+ R2)/f1< 2.01.

In the present exemplary embodiment, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R10 of the image-side surface of the fifth lens, and the effective focal length f5 of the fifth lens satisfy the conditional expression: 2.6< (R9+ R10)/f5< 4.1. By controlling the ratio of the effective focal length of the fifth lens to the curvature radius of the image side surface and the object side surface, the system can better realize the deflection of the optical path and balance the high-level spherical aberration generated by the imaging system. More specifically, R9, R10 and f5 satisfy: 2.76< (R9+ R10)/f5< 3.94.

In the present exemplary embodiment, the conditional expression that the radius of curvature R3 of the second lens object-side surface, the radius of curvature R4 of the second lens image-side surface, and the radius of curvature R5 of the third lens object-side surface satisfy is: 0.1< (R3+ R4)/R5< 1.0. The axial aberration generated by the image pickup optical system can be effectively balanced by reasonably controlling the curvature radius of the second lens and the curvature radius of the object side surface of the third lens to be in a certain interval. More specifically, R3, R4 and R5 satisfy: 0.20< (R3+ R4)/R5< 0.93.

In the present exemplary embodiment, the on-axis distance TTL of the object-side surface of the first lens to the imaging surface, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy the conditional expressions: 2.8< TTL/(CT4+ CT5+ CT6) < 3.4. The distance between the object side surface of the first lens and the imaging surface and the center thickness of the fourth lens, the fifth lens and the sixth lens on the optical axis are limited to be within a certain range, so that reasonable size layout can be realized, and the ultrathin characteristic can be realized while large aperture and high resolution are realized. More specifically, TTL, CT4, CT5 and CT6 satisfy: 3.02< TTL/(CT4+ CT5+ CT6) < 3.11.

In the present exemplary embodiment, the combined focal length f12 of the first and second lenses, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy the conditional expression: 6.0< f12/(CT1+ CT2) < 7.0. By restricting the ratio of the composite focal length of the first lens and the second lens to the sum of the central thicknesses of the first lens and the second lens on the axis, the coma aberration of the system can be reasonably controlled, so that the optical system has good optical performance. More specifically, f12, CT1 and CT2 satisfy: 6.21< f12/(CT1+ CT2) < 6.54.

In the present exemplary embodiment, the conditional expression that the edge thickness ET6 of the sixth lens, the edge thickness ET2 of the second lens, and the edge thickness ET5 of the fifth lens satisfy is: 1.0< ET6/(ET2+ ET5) < 1.7. The edge thickness of the second lens, the fifth lens and the sixth lens is reasonably restrained, the phenomenon that the edge of the lens is too thin and is not easy to form can be avoided, meanwhile, the light deflection at the edge of the lens is relieved, and the strong ghost risk is avoided. More specifically, ET6, ET2 and ET5 satisfy: 1.34< ET6/(ET2+ ET5) < 1.57.

In the present exemplary embodiment, the on-axis distance SAG22 between the air space T23 on the optical axis between the second lens and the third lens and the intersection of the second lens image-side surface and the optical axis to the effective radius vertex of the second lens image-side surface satisfies the conditional expression: 2.2< T23/SAG22< 3.1. The ratio of the air space of the second lens and the third lens on the optical axis to the image side vector height of the second lens is restricted within a certain range, so that the processing, forming and assembling of the second lens can be effectively guaranteed, and the field curvature contribution of each field of view is controlled within a reasonable range. More specifically, T23 and SAG22 satisfy: 2.44< T23/SAG22< 2.95.

In the present exemplary embodiment, the conditional expression that the on-axis distance SAG52 between the intersection point of the fifth lens image-side surface and the optical axis to the effective radius vertex of the fifth lens image-side surface and the on-axis distance SAG51 between the intersection point of the fifth lens object-side surface and the optical axis to the effective radius vertex of the fifth lens object-side surface satisfy: 1.7< SAG52/SAG51< 2.5. By controlling SAG52/SAG51 within a reasonable range, spherical aberration, coma aberration and astigmatism generated on the image side surface of the fifth lens and the object side surface of the fifth lens can be effectively balanced, and therefore the imaging quality of the system is improved. More specifically, SAG52 and SAG51 satisfy: 1.89< SAG52/SAG51< 2.35.

In the present exemplary embodiment, the conditional expression that the on-axis distance SAG41 between the intersection of the fourth lens object-side surface and the optical axis to the effective radius vertex of the fourth lens object-side surface and the on-axis distance SAG31 between the intersection of the third lens object-side surface and the optical axis to the effective radius vertex of the third lens object-side surface satisfy: 1.6< SAG41/SAG31< 3.4. The ratio of the object-side vector height of the fourth lens to the object-side vector height of the third lens is controlled within a certain range, so that the processing and forming of the lenses are guaranteed, the sensitivity is reduced, and the yield of the whole imaging system is improved. More specifically, SAG41 and SAG31 satisfy: 1.86< SAG41/SAG31< 3.18.

In the present exemplary embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy the conditional expression: f/EPD < 1.9. By controlling the ratio of the effective focal length to the entrance pupil diameter of the optical imaging lens, the F number of the imaging system with a large image plane is smaller than 1.9, and the characteristic of large aperture of the system can be realized. More specifically, f and EPD satisfy: 1.85< f/EPD < 1.87.

In the present exemplary embodiment, the above-described optical imaging lens may further include a diaphragm. The stop may be disposed at an appropriate position as needed, for example, the stop may be disposed between the object side and the first lens. 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 according to the above embodiment of the present invention may employ a plurality of lenses, for example, the above six lenses. The optical imaging lens has the characteristics of large imaging image surface, wide imaging range and high imaging quality by reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, and the ultrathin property of the mobile phone is ensured.

In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.

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, and may include other numbers of lenses if necessary.

Specific embodiments of an optical imaging lens suitable for the above-described embodiments are further described below with reference to the drawings.

Detailed description of the preferred embodiment 1

Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present disclosure, wherein the optical imaging lens includes, in order from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative 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. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane S15.

As shown in table 1, a basic parameter table of the optical imaging lens of embodiment 1 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 1

As shown in table 2, in embodiment 1, the total effective focal length f of the optical imaging lens is 5.52mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.77mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S15 is 5.52mm, and the maximum field angle FOV of the optical imaging system is 86.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 2

The optical imaging lens in embodiment 1 satisfies:

ImgH × EPD/f is 2.83mm, where ImgH is half of the diagonal length of the effective pixel region on the imaging plane, EPD is the entrance pupil diameter of the optical imaging lens, and f is the effective focal length of the optical imaging lens;

the TTL/ImgH is 1.28, where TTL is an on-axis distance from the object-side surface of the first lens element to the imaging surface, and ImgH is half the diagonal length of the effective pixel area on the imaging surface;

ImgH × ImgH/TTL is 4.13mm, where ImgH is half the diagonal length of the effective pixel area on the imaging plane, and TTL is the on-axis distance from the object-side surface of the first lens to the imaging plane;

f4/(f2+ f6) ═ 1.13, where f4 is the effective focal length of the fourth lens, f2 is the effective focal length of the second lens, and f6 is the effective focal length of the sixth lens;

(R1+ R2)/f1 is 1.89, where R1 is the radius of curvature of the object-side surface of the first lens, R2 is the radius of curvature of the image-side surface of the first lens, and f1 is the effective focal length of the first lens;

(R9+ R10)/f5 is 3.83, where R9 is the radius of curvature of the object-side surface of the fifth lens, R10 is the radius of curvature of the image-side surface of the fifth lens, and f5 is the effective focal length of the fifth lens;

(R3+ R4)/R5 is 0.55, where R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, and R5 is the radius of curvature of the object-side surface of the third lens;

TTL/(CT4+ CT5+ CT6) ═ 3.12, where TTL is the on-axis distance from the object-side surface of the first lens to the image plane, CT4 is the center thickness of the fourth lens, CT5 is the center thickness of the fifth lens on the optical axis, and CT6 is the center thickness of the sixth lens on the optical axis;

f12/(CT1+ CT2) ═ 6.18, where f12 is the combined focal length of the first and second lenses, CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis;

ET6/(ET2+ ET5) ═ 1.18, where ET6 is the edge thickness of the sixth lens, ET2 is the edge thickness of the second lens, and ET5 is the edge thickness of the fifth lens;

T23/SAG22 is 2.35, where T23 is the air space on the optical axis between the second lens and the third lens, and SAG22 is the on-axis distance between the intersection of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens;

SAG52/SAG51 is 1.91, wherein SAG52 is an on-axis distance between an intersection point of the image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens, and SAG51 is an on-axis distance between an intersection point of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens;

SAG41/SAG31 is 3.28, wherein SAG41 is the on-axis distance between the intersection of the fourth lens object side surface and the optical axis and the effective radius vertex of the fourth lens object side surface, and SAG31 is the on-axis distance between the intersection of the third lens object side surface and the optical axis and the effective radius vertex of the third lens object side surface;

and f/EPD is 1.87, wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface 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); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.

In example 1, 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 table 3 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S12 in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.3191E-03

4.4915E-02

-2.5141E-01

8.9210E-01

-2.0840E+00

3.3265E+00

-3.7120E+00

S2

-1.2409E-02

-1.6255E-01

1.1877E+00

-4.8710E+00

1.2979E+01

-2.3619E+01

3.0167E+01

S3

-5.6468E-02

2.7653E-01

-2.0599E+00

1.0443E+01

-3.4744E+01

7.9274E+01

-1.2770E+02

S4

-1.8601E-02

1.8396E-02

1.2926E-01

-7.9488E-01

2.6463E+00

-5.4007E+00

6.6550E+00

S5

-4.8605E-02

1.6092E-01

-1.1909E+00

5.6996E+00

-1.8831E+01

4.4017E+01

-7.4252E+01

S6

-4.6448E-02

-8.9557E-02

7.0991E-01

-3.0794E+00

8.5836E+00

-1.6478E+01

2.2464E+01

S7

-6.8595E-02

-5.3651E-02

3.4457E-01

-1.0636E+00

2.1781E+00

-3.1333E+00

3.2405E+00

S8

-5.7008E-02

-1.2213E-02

7.3832E-02

-1.4170E-01

1.7990E-01

-1.6138E-01

1.0484E-01

S9

-1.2038E-02

-1.8655E-02

2.8275E-02

-3.6041E-02

3.4981E-02

-2.4259E-02

1.1949E-02

S10

-3.5435E-03

1.1904E-02

-2.3313E-02

2.9431E-02

-2.3712E-02

1.2956E-02

-4.8800E-03

S11

-1.2235E-01

4.6739E-02

-1.0479E-02

6.4166E-04

6.1272E-04

-2.7687E-04

6.2935E-05

S12

-1.4290E-01

7.0941E-02

-2.9921E-02

9.8000E-03

-2.4079E-03

4.3862E-04

-5.9064E-05

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

2.9273E+00

-1.6302E+00

6.3176E-01

-1.6469E-01

2.7017E-02

-2.4324E-03

8.4588E-05

S2

-2.7392E+01

1.7685E+01

-8.0068E+00

2.4611E+00

-4.8196E-01

5.2875E-02

-2.3466E-03

S3

1.4745E+02

-1.2248E+02

7.2543E+01

-2.9880E+01

8.1296E+00

-1.3132E+00

9.5347E-02

S4

-3.9984E+00

-1.0638E+00

4.1989E+00

-3.7017E+00

1.7162E+00

-4.2704E-01

4.5142E-02

S5

9.1294E+01

-8.1819E+01

5.2849E+01

-2.3949E+01

7.2224E+00

-1.3013E+00

1.0599E-01

S6

-2.2070E+01

1.5669E+01

-7.9618E+00

2.8220E+00

-6.6237E-01

9.2478E-02

-5.8111E-03

S7

-2.4334E+00

1.3269E+00

-5.1912E-01

1.4172E-01

-2.5586E-02

2.7405E-03

-1.3166E-04

S8

-4.9865E-02

1.7381E-02

-4.3889E-03

7.8059E-04

-9.2587E-05

6.5650E-06

-2.1026E-07

S9

-4.1946E-03

1.0447E-03

-1.8205E-04

2.1604E-05

-1.6594E-06

7.4276E-08

-1.4702E-09

S10

1.2783E-03

-2.3406E-04

2.9842E-05

-2.5975E-06

1.4727E-07

-4.9064E-09

7.2910E-11

S11

-9.1407E-06

9.0348E-07

-6.1762E-08

2.8848E-09

-8.8109E-11

1.5888E-12

-1.2844E-14

S12

5.8640E-06

-4.2613E-07

2.2314E-08

-8.1756E-10

1.9851E-11

-2.8653E-13

1.8593E-15

TABLE 3

Fig. 2a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2c shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 2a to 2d, the optical imaging lens according to embodiment 1 can achieve good imaging quality.

Specific example 2

Fig. 3 is a schematic view of a lens assembly according to embodiment 2 of the present invention, the optical imaging lens, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

As shown in table 4, the basic parameter table of the optical imaging lens of embodiment 2 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness-Distance between two adjacent plates	Focal length	Refractive index	Coefficient of dispersion	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.5906
								S1	Aspherical surface	2.1654	0.7988	5.38	1.54	56.1	0.0000
S2	Aspherical surface	7.1698	0.1260				0.0000
								S3	Aspherical surface	11.4726	0.2975	-16.98	1.67	19.2	0.0000
S4	Aspherical surface	5.6837	0.4173				0.0000
								S5	Aspherical surface	29.5783	0.5004	22.91	1.54	56.1	0.0000
S6	Aspherical surface	-21.5363	0.2736				0.0000
								S7	Aspherical surface	-10.9256	0.5288	-18.23	1.64	23.5	0.0000
S8	Aspherical surface	-158.7302	0.4676				0.0000
								S9	Aspherical surface	20.6203	0.8622	4.54	1.54	55.7	0.0000
S10	Aspherical surface	-2.7249	0.4993				-1.0000
								S11	Aspherical surface	263.6062	0.8294	-3.53	1.54	55.7	0.0000
S12	Aspherical surface	1.8809	0.7251				-1.0000
								S13	Spherical surface	All-round	0.2100		1.52	64.2
S14	Spherical surface	All-round	0.3378
								S15	Spherical surface	All-round

TABLE 4

As shown in table 5, in embodiment 2, the total effective focal length f of the optical imaging lens is 5.52mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.87mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S15 is 5.26mm, and the maximum field angle FOV of the optical imaging system is 86.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 5

In example 2, 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 table 6 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S12 in example 2₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.3002E-03

4.4366E-02

-2.4732E-01

8.7400E-01

-2.0333E+00

3.2324E+00

-3.5922E+00

S2

-1.2267E-02

-1.5977E-01

1.1608E+00

-4.7333E+00

1.2540E+01

-2.2690E+01

2.8814E+01

S3

-5.6455E-02

2.7643E-01

-2.0590E+00

1.0437E+01

-3.4721E+01

7.9213E+01

-1.2758E+02

S4

-1.8460E-02

1.8187E-02

1.2730E-01

-7.7990E-01

2.5865E+00

-5.2588E+00

6.4555E+00

S5

-4.8417E-02

1.5999E-01

-1.1817E+00

5.6449E+00

-1.8614E+01

4.3427E+01

-7.3116E+01

S6

-4.6402E-02

-8.9425E-02

7.0851E-01

-3.0719E+00

8.5583E+00

-1.6421E+01

2.2376E+01

S7

-7.0254E-02

-5.5608E-02

3.6143E-01

-1.1290E+00

2.3399E+00

-3.4066E+00

3.5654E+00

S8

-5.8503E-02

-1.2697E-02

7.7755E-02

-1.5117E-01

1.9443E-01

-1.7668E-01

1.1628E-01

S9

-1.2139E-02

-1.8890E-02

2.8750E-02

-3.6800E-02

3.5867E-02

-2.4976E-02

1.2354E-02

S10

-3.5924E-03

1.2151E-02

-2.3960E-02

3.0456E-02

-2.4707E-02

1.3592E-02

-5.1548E-03

S11

-1.2494E-01

4.8236E-02

-1.0929E-02

6.7628E-04

6.5261E-04

-2.9801E-04

6.8456E-05

S12

-1.4450E-01

7.2134E-02

-3.0594E-02

1.0076E-02

-2.4896E-03

4.5602E-04

-6.1750E-05

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

2.8213E+00

-1.5647E+00

6.0390E-01

-1.5679E-01

2.5615E-02

-2.2967E-03

7.9543E-05

S2

-2.6014E+01

1.6699E+01

-7.5174E+00

2.2974E+00

-4.4734E-01

4.8797E-02

-2.1532E-03

S3

1.4730E+02

-1.2234E+02

7.2455E+01

-2.9840E+01

8.1178E+00

-1.3111E+00

9.5188E-02

S4

-3.8638E+00

-1.0241E+00

4.0268E+00

-3.5365E+00

1.6334E+00

-4.0489E-01

4.2637E-02

S5

8.9723E+01

-8.0257E+01

5.1740E+01

-2.3402E+01

7.0437E+00

-1.2667E+00

1.0297E-01

S6

-2.1973E+01

1.5592E+01

-7.9188E+00

2.8054E+00

-6.5815E-01

9.1843E-02

-5.7683E-03

S7

-2.7096E+00

1.4952E+00

-5.9202E-01

1.6357E-01

-2.9885E-02

3.2393E-03

-1.5749E-04

S8

-5.6025E-02

1.9782E-02

-5.0604E-03

9.1173E-04

-1.0955E-04

7.8690E-06

-2.5531E-07

S9

-4.3548E-03

1.0892E-03

-1.9058E-04

2.2712E-05

-1.7517E-06

7.8737E-08

-1.5650E-09

S10

1.3595E-03

-2.5065E-04

3.2177E-05

-2.8199E-06

1.6098E-07

-5.4000E-09

8.0796E-11

S11

-1.0048E-05

1.0036E-06

-6.9332E-08

3.2727E-09

-1.0101E-10

1.8407E-12

-1.5037E-14

S12

6.1648E-06

-4.5049E-07

2.3721E-08

-8.7396E-10

2.1338E-11

-3.0972E-13

2.0210E-15

TABLE 6

Fig. 4a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4c shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 4a to 4d, the optical imaging lens according to embodiment 2 can achieve good imaging quality.

Specific example 3

Fig. 5 is a lens assembly according to embodiment 3 of the present invention, which, in order from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

As shown in table 7, the basic parameter table of the optical imaging lens of embodiment 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Coefficient of dispersion	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.5980
								S1	Aspherical surface	2.1455	0.8075	5.32	1.54	56.1	0.0000
S2	Aspherical surface	7.1127	0.1248				0.0000
								S3	Aspherical surface	10.8239	0.2937	-16.87	1.67	19.2	0.0000
S4	Aspherical surface	5.4988	0.4139				0.0000
								S5	Aspherical surface	19.2291	0.4251	38.21	1.54	56.1	0.0000
S6	Aspherical surface	243.9024	0.2398				0.0000
								S7	Aspherical surface	-29.4995	0.5273	-25.13	1.64	23.5	0.0000
S8	Aspherical surface	36.1775	0.4838				0.0000
								S9	Aspherical surface	16.9772	0.9468	4.40	1.54	55.7	0.0000
S10	Aspherical surface	-2.6872	0.4757				-1.0000
								S11	Aspherical surface	-234.2364	0.7676	-3.44	1.54	55.7	0.0000
S12	Aspherical surface	1.8628	0.7486				-1.0000
								S13	Spherical surface	All-round	0.2100		1.52	64.2
S14	Spherical surface	All-round	0.3336
								S15	Spherical surface	All-round

TABLE 7

As shown in table 8, in embodiment 3, the total effective focal length f of the optical imaging lens is 5.52mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.80mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S15 is 5.28mm, and the maximum field angle FOV of the optical imaging system is 86.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 8

In example 3, 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 table 9 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S12 in example 3₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.3092E-03

4.4629E-02

-2.4928E-01

8.8263E-01

-2.0575E+00

3.2772E+00

-3.6492E+00

S2

-1.2407E-02

-1.6251E-01

1.1873E+00

-4.8692E+00

1.2973E+01

-2.3607E+01

3.0149E+01

S3

-5.7425E-02

2.8359E-01

-2.1303E+00

1.0891E+01

-3.6540E+01

8.4076E+01

-1.3657E+02

S4

-1.9156E-02

1.9225E-02

1.3708E-01

-8.5549E-01

2.8902E+00

-5.9860E+00

7.4853E+00

S5

-4.9545E-02

1.6561E-01

-1.2374E+00

5.9792E+00

-1.9944E+01

4.7070E+01

-8.0166E+01

S6

-4.9057E-02

-9.7207E-02

7.9189E-01

-3.5302E+00

1.0113E+01

-1.9951E+01

2.7952E+01

S7

-7.4651E-02

-6.0910E-02

4.0809E-01

-1.3141E+00

2.8074E+00

-4.2131E+00

4.5454E+00

S8

-6.3667E-02

-1.4414E-02

9.2088E-02

-1.8678E-01

2.5059E-01

-2.3755E-01

1.6309E-01

S9

-1.3185E-02

-2.1384E-02

3.3921E-02

-4.5251E-02

4.5965E-02

-3.3360E-02

1.7197E-02

S10

-3.6259E-03

1.2322E-02

-2.4410E-02

3.1172E-02

-2.5405E-02

1.4042E-02

-5.3500E-03

S11

-1.3336E-01

5.3188E-02

-1.2450E-02

7.9592E-04

7.9348E-04

-3.7434E-04

8.8837E-05

S12

-1.5484E-01

8.0017E-02

-3.5130E-02

1.1977E-02

-3.0634E-03

5.8087E-04

-8.1422E-05

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

2.8717E+00

-1.5958E+00

6.1710E-01

-1.6053E-01

2.6278E-02

-2.3608E-03

8.1924E-05

S2

-2.7374E+01

1.7672E+01

-8.0004E+00

2.4589E+00

-4.8150E-01

5.2821E-02

-2.3441E-03

S3

1.5903E+02

-1.3321E+02

7.9567E+01

-3.3049E+01

9.0677E+00

-1.4771E+00

1.0815E-01

S4

-4.5639E+00

-1.2322E+00

4.9357E+00

-4.4156E+00

2.0775E+00

-5.2460E-01

5.6275E-02

S5

9.9513E+01

-9.0044E+01

5.8721E+01

-2.6867E+01

8.1802E+00

-1.4881E+00

1.2237E-01

S6

-2.8223E+01

2.0592E+01

-1.0753E+01

3.9169E+00

-9.4483E-01

1.3557E-01

-8.7546E-03

S7

-3.5609E+00

2.0255E+00

-8.2670E-01

2.3545E-01

-4.4343E-02

4.9547E-03

-2.4832E-04

S8

-8.1978E-02

3.0197E-02

-8.0582E-03

1.5146E-03

-1.8985E-04

1.4226E-05

-4.8150E-07

S9

-6.3179E-03

1.6468E-03

-3.0033E-04

3.7301E-05

-2.9984E-06

1.4046E-07

-2.9097E-09

S10

1.4176E-03

-2.6257E-04

3.3864E-05

-2.9816E-06

1.7101E-07

-5.7629E-09

8.6628E-11

S11

-1.3471E-05

1.3901E-06

-9.9212E-08

4.8381E-09

-1.5427E-10

2.9043E-12

-2.4512E-14

S12

8.4147E-06

-6.3653E-07

3.4697E-08

-1.3233E-09

3.3445E-11

-5.0253E-13

3.3945E-15

TABLE 9

Fig. 6a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6c shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 6a to 6d, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Specific example 4

Fig. 7 is a lens assembly structure of the optical imaging lens system according to embodiment 4 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

As shown in table 10, the basic parameter table of the optical imaging lens of embodiment 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Coefficient of dispersion	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.5900
								S1	Aspherical surface	2.1665	0.7995	5.37	1.54	56.1	0.0000
S2	Aspherical surface	7.2133	0.1255				0.0000
								S3	Aspherical surface	11.6023	0.3001	-16.76	1.67	19.2	0.0000
S4	Aspherical surface	5.6783	0.4207				0.0000
								S5	Aspherical surface	18.6046	0.4352	36.87	1.54	56.1	0.0000
S6	Aspherical surface	243.9024	0.2332				0.0000
								S7	Aspherical surface	-29.0731	0.5295	-25.46	1.64	23.5	0.0000
S8	Aspherical surface	37.9501	0.5023				0.0000
								S9	Aspherical surface	16.5914	0.9391	4.50	1.54	55.7	0.0000
S10	Aspherical surface	-2.7704	0.4871				-1.0000
								S11	Aspherical surface	370.3704	0.7988	-3.56	1.54	55.7	0.0000
S12	Aspherical surface	1.8980	0.7375				-1.0000
								S13	Spherical surface	All-round	0.2100		1.52	64.2
S14	Spherical surface	All-round	0.3336
								S15	Spherical surface	All-round

Watch 10

As shown in table 11, in embodiment 4, the total effective focal length f of the optical imaging lens is 5.52mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.85mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S15 is 5.29mm, and the maximum field angle FOV of the optical imaging system is 86.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 11

In example 4, 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 table 12 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S12 in example 4₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

TABLE 12

Fig. 8a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8c shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 8a to 8d, the optical imaging lens according to embodiment 4 can achieve good imaging quality.

Specific example 5

Fig. 9 is a lens assembly structure of the optical imaging lens system according to embodiment 5 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative 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. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane S15.

As shown in table 13, the basic parameter table of the optical imaging lens of example 5 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Watch 13

As shown in table 14, in embodiment 5, the total effective focal length f of the optical imaging lens is 5.45mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 6.77mm, the half ImgH of the diagonal line length of the effective pixel region on the imaging surface S15 is 5.30mm, and the maximum field angle FOV of the optical imaging system is 86.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 14

In example 5, the object-side surface and the image-side surface of any one of the first lens element E1 to the sixth lens element E6 are aspheric, and table 15 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S12 in example 5₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Watch 15

Fig. 10a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10c shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 10a to 10d, the optical imaging lens according to embodiment 5 can achieve good imaging quality.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, improvements, equivalents and the like that fall within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

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

a first lens having a positive optical power;

the image side surface of the second lens is a concave surface;

a third lens having a refractive power, an object-side surface of which is convex;

a fourth lens having a negative refractive power, an object-side surface of which is concave;

a fifth lens having a positive optical power;

a sixth lens having a negative optical power;

2. The optical imaging lens according to claim 1, characterized in that: 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 < 1.35.

3. The optical imaging lens according to claim 1, characterized in that: the length of half of the diagonal ImgH of the effective pixel area on the imaging surface and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: 4.0mm < ImgH × ImgH/TTL <6.0 mm.

4. The optical imaging lens according to claim 1, characterized in that: an effective focal length f4 of the fourth lens, an effective focal length f2 of the second lens, and an effective focal length f6 of the sixth lens satisfy: 0.8< f4/(f2+ f6) < 2.6.

5. The optical imaging lens according to claim 1, characterized in that: a radius of curvature of the first lens object side surface R1, a radius of curvature of the first lens image side surface R2, and an effective focal length of the first lens f1 satisfy: 1.6< (R1+ R2)/f1< 2.2.

6. The optical imaging lens according to claim 1, characterized in that: a radius of curvature R9 of the fifth lens object-side surface, a radius of curvature R10 of the fifth lens image-side surface, and an effective focal length f5 of the fifth lens satisfy: 2.6< (R9+ R10)/f5< 4.1.

7. The optical imaging lens according to claim 1, characterized in that: a radius of curvature R3 of the second lens object-side surface, a radius of curvature R4 of the second lens image-side surface, and a radius of curvature R5 of the third lens object-side surface satisfy: 0.1< (R3+ R4)/R5< 1.0.

8. The optical imaging lens according to claim 1, characterized in that: an on-axis distance TTL from an object-side surface of the first lens to an imaging surface, a central thickness CT4 of the fourth lens, a central thickness CT5 of the fifth lens on an optical axis, and a central thickness CT6 of the sixth lens on the optical axis satisfy: 2.8< TTL/(CT4+ CT5+ CT6) < 3.4.

9. The optical imaging lens according to claim 1, characterized in that: the combined focal length f12 of the first and second lenses, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 6.0< f12/(CT1+ CT2) < 7.0.

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

a first lens having a positive optical power;

the image side surface of the second lens is a concave surface;

a fifth lens having a positive optical power;

a sixth lens having a negative optical power;

wherein an effective focal length f4 of the fourth lens, an effective focal length f2 of the second lens, and an effective focal length f6 of the sixth lens satisfy: 0.8< f4/(f2+ f6) < 2.6.