CN113552702A - Optical imaging lens - Google Patents

Abstract

The invention relates to an optical imaging lens, wherein the optical imaging lens comprises a first lens with optical power arranged along an optical axis, a second lens with negative optical power, a diaphragm, a lens with optical power The third lens, the fourth lens with refractive power, the fifth lens with positive refractive power, and the sixth lens with refractive power; the lens satisfies: 3.5<(R5+R6)/(R5‑R6)<5.0 and -5.5 < SAG42/SAG11 < -3.5. The optical imaging lens with this structure can effectively balance and control the low-order aberration of the lens, and has the characteristics of ultra-thin, large aperture and small distortion, and is suitable for portable electronic products. good sex.

Description

Optical imaging lens

Technical Field

The invention relates to the field of optical imaging, in particular to an optical imaging lens, and specifically relates to an optical imaging lens consisting of six lenses.

Background

With the portable advantages of electronic products such as smart phones and tablet computers, the popularization degree of the electronic products is higher and higher. With the increasing demand of consumers for electronic products to be light and thin, ultra-thin imaging systems are becoming a trend. Meanwhile, with the improvement of the performance and the reduction of the size of the CCD and CMOS image sensors, consumers have higher requirements on the performance of the imaging lens, and specifications such as large aperture, high pixel, miniaturization and the like are developed.

In order to meet the actual requirements, an optical imaging lens which has the characteristics of ultrathin thickness, large aperture and small distortion and is suitable for portable electronic products and has good imaging quality is urgently needed.

Disclosure of Invention

The invention aims to provide a six-piece optical imaging lens with good imaging quality, which has the characteristics of ultrathin thickness, large aperture and small distortion and is suitable for portable electronic products.

An aspect of the present invention provides an optical imaging lens including, disposed along an optical axis:

a first lens having an optical power;

a second lens having a negative optical power;

a diaphragm;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens having a positive optical power;

a sixth lens having optical power;

wherein the radius of curvature R5 of the object-side surface of the third lens element and the radius of curvature R6 of the image-side surface of the third lens element satisfy: 3.5 < (R5+ R6)/(R5-R6) < 5.0;

an on-axis distance SAG11 from an intersection point of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens to an on-axis distance SAG42 from an intersection point of the image-side surface of the fourth lens and the optical axis to an effective radius vertex of the image-side surface of the fourth lens satisfies: -5.5 < SAG42/SAG11 < -3.5.

According to one embodiment of the present invention, the maximum field angle FOV of the optical imaging lens satisfies: FOV > 90.

According to an 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 < 2.5.

According to an embodiment of the present invention, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy: TTL/ImgH is less than 1.6.

According to an embodiment of the present invention, an on-axis distance SAG51 between an intersection point of an 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 and an on-axis distance SAG62 between an intersection point of an image-side surface of the sixth lens and the optical axis and an effective radius vertex of the image-side surface of the sixth lens satisfy: 0.5 < SAG62/SAG51 < 2.0.

According to an embodiment of the present invention, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 1.5 < CT1/ET1 < 2.0.

According to an embodiment of the present invention, a combined focal length f23 of the second lens and the third lens and an effective focal length f1 of the first lens satisfy: -3.0 < f23/f1 < -2.0.

According to an embodiment of the present invention, ImgH, which is a half of a diagonal length of an effective pixel region on an imaging surface of the optical imaging lens, and an on-axis distance TD from an object side surface of the first lens to an image side surface of a last lens in the optical imaging lens satisfy: imgH/TD is more than 0.5 and less than 1.0.

According to an embodiment of the present invention, an air interval T45 between the fourth lens and the fifth lens on the optical axis and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3.7 < T56/T45 < 8.1.

According to an embodiment of the present invention, a distance SD from the stop to an image side surface of a last lens in the optical imaging lens and a sum Σ AT of air intervals on the optical axis between any two adjacent lenses having optical powers in the first lens to a lens closest to an imaging surface in the optical imaging lens satisfy: 2.5 < SD/∑ AT < 3.0.

According to an embodiment of the present invention, an on-axis distance SAG31 from an intersection point of an object-side surface of the third lens and the optical axis to a vertex of an effective radius of the object-side surface of the third lens to an intersection point of an image-side surface of the third lens and the optical axis to a vertex of an effective radius of the image-side surface of the third lens satisfies an on-axis distance SAG 32: 2.0 < (SAG31+ SAG32)/(SAG31-SAG32) < 3.5.

According to an embodiment of the present invention, the effective focal length f4 of the fourth lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 2.0 < f4/f45 < 2.5.

According to an embodiment of the present invention, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: 2.5 < R7/R8 < 4.1.

According to an embodiment of the present invention, a combined focal length f345 of the third lens, the fourth lens and the fifth lens and an effective focal length f of the optical imaging lens satisfy: f345/f is more than 1.0 and less than 1.5.

According to one embodiment of the present invention, the absolute value | OPD | of the optical distortion of the optical imaging lens satisfies: the < 1.5% of OPD.

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, wherein the low-order aberration of the lens can be effectively balanced and controlled by reasonably controlling the positive and negative distribution of the focal power of each lens in the lens.

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 structural diagram of a lens barrel according to an optical imaging lens system 1 of the present invention;

fig. 1a to 1d 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. 2 is a schematic structural diagram of a lens barrel according to an optical imaging lens system of embodiment 2 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, according to an optical imaging lens of embodiment 2 of the present invention;

fig. 3 is a schematic structural diagram of a lens barrel according to an optical imaging lens embodiment 3 of the present invention;

fig. 3a to 3d 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. 4 is a schematic structural diagram of a lens barrel according to an optical imaging lens embodiment 4 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, of an optical imaging lens according to embodiment 4 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 diaphragm, 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 optical power; the second lens has negative focal power; the third lens has focal power; the fourth lens has focal power; the fifth lens has positive focal power; the sixth lens has optical power. The low-order aberration of the optical imaging lens can be effectively and balance controlled by reasonably controlling the positive and negative distribution of the focal power of each lens of the optical imaging lens.

In the present exemplary embodiment, the conditional expression that the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy is: 3.5 < (R5+ R6)/(R5-R6) < 5.0. The design can reduce tolerance sensitivity by controlling the curvature radius ratio of the third lens, and maintain the miniaturization of the optical imaging lens. More specifically, R5 and R6 satisfy: 3.7 < (R5+ R6)/(R5-R6) < 4.8, for example, 3.9 ≦ (R5+ R6)/(R5-R6) ≦ 4.78.

In the present exemplary embodiment, the conditional expression that an on-axis distance SAG11 between an intersection point of the object-side surface of the first lens and the optical axis and an effective radius vertex of the object-side surface of the first lens and an on-axis distance SAG42 between an intersection point of the image-side surface of the fourth lens and the optical axis and an effective radius vertex of the image-side surface of the fourth lens satisfy: -5.5 < SAG42/SAG11 < -3.5. By reasonably controlling the ratio, the inclination angles of the image side surface of the fourth lens and the object side surface of the first lens can be effectively controlled, and the ghost risk between the fourth lens and the first lens is reduced. More specifically, SAG42 and SAG11 satisfy: 6.0 < SAG42/SAG11 < -4.0, for example, -6.84. ltoreq. SAG42/SAG 11. ltoreq-4.43.

In the exemplary embodiment, the maximum field angle FOV of the optical imaging lens satisfies the following conditional expression: FOV > 90. By optimizing the optical imaging lens, the maximum field angle of the optical imaging lens is larger than 90 degrees, so that the characteristic of wide angle of the optical imaging lens is achieved. More specifically, the FOV satisfies: FOV >92 °, for example FOV ≧ 93.7 °.

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 following conditional expression: f/EPD < 2.5. And (3) distributing the focal power of the optical imaging lens to enable the F number of the optical imaging lens to be less than 2.5, and finishing the characteristic of large aperture of the optical imaging lens. More specifically, f and EPD satisfy: f/EPD < 2.3, e.g., f/EPD ≦ 2.04.

In this exemplary embodiment, the distance TTL between the object-side surface of the first lens element and the imaging surface of the optical imaging lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens satisfy the following conditional expression: TTL/ImgH is less than 1.6. The ratio of the total length of the optical imaging lens to half of the diagonal length of the effective pixel area on the imaging surface is constrained to be less than 1.6, so that the optical imaging lens is ultrathin. More specifically, TTL and ImgH satisfy: TTL/ImgH < 1.5, e.g., TTL/ImgH ≦ 1.44.

In the present exemplary embodiment, an on-axis distance SAG51 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 and an on-axis distance SAG62 between an intersection point of the image-side surface of the sixth lens and the optical axis and an effective radius vertex of the image-side surface of the sixth lens satisfy the conditional expression: 0.5 < SAG62/SAG51 < 2.0. By reasonably controlling the ratio, the inclination angles of the object side surface of the fifth lens and the image side surface of the sixth lens can be effectively controlled, and the ghost risk between the fifth lens and the sixth lens is reduced. More specifically, SAG62 and SAG51 satisfy: 0.6 < SAG62/SAG51 < 1.8, for example, 0.89. ltoreq. SAG62/SAG 51. ltoreq.1.62.

In the present exemplary embodiment, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy the following conditional expression: 1.5 < CT1/ET1 < 2.0. By controlling the ratio of the central thickness to the edge thickness of the first lens, the thickness ratio of the first lens can be controlled, the problem that the first lens is too thick or too thin in the design process is prevented, and the processing feasibility of the first lens is ensured. More specifically, CT1 and ET1 satisfy: 1.6 < CT1/ET1 < 1.95, e.g., 1.74. ltoreq. CT1/ET 1. ltoreq.1.91.

In the present exemplary embodiment, the combined focal length f23 of the second lens and the third lens and the effective focal length f1 of the first lens satisfy the conditional expression: -3.0 < f23/f1 < -2.0. By restricting the ratio of the combined focal length of the second lens and the third lens to the effective focal length of the first lens within a certain range, the curvature of field of the optical imaging lens can be reasonably controlled within a certain range. More specifically, f23 and f1 satisfy: -2.80 < f23/f1 < -2.10, for example, -2.76. ltoreq. f23/f 1. ltoreq. 2.19.

In the present exemplary embodiment, the conditional expression that half ImgH of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens and the on-axis distance TD from the object-side surface of the first lens to the image-side surface of the last lens in the optical imaging lens satisfy is: imgH/TD is more than 0.5 and less than 1.0. By restricting the ratio of the length of the half diagonal line of the effective pixel area on the imaging surface to the axial distance from the object side surface of the first lens to the image side surface of the last lens, the size of the view field is effectively controlled, and better imaging quality is obtained. More specifically, ImgH and TD satisfy: 0.6 < ImgH/TD < 0.98, e.g., 0.88. ltoreq. ImgH/TD. ltoreq.0.95.

In the present exemplary embodiment, the air interval T45 of the fourth lens and the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy the conditional expression: 3.7 < T56/T45 < 8.1. By restricting the ratio of the air space of the fifth lens and the sixth lens to the air space of the fourth lens and the fifth lens, the field curvature contribution amount of each field of view can be controlled within a reasonable range. More specifically, T56 and T45 satisfy: 3.73 < T56/T45 < 8.07, e.g., 3.76. ltoreq. T56/T45. ltoreq.8.03.

In the present exemplary embodiment, a conditional expression that a distance SD from the stop to an image side surface of a last lens in the optical imaging lens and a sum Σ AT of air intervals on the optical axis between any two adjacent lenses having optical powers in the first lens to a lens closest to an image plane in the optical imaging lens satisfy: 2.5 < SD/∑ AT < 3.0. The distortion contribution of each visual field of the optical imaging lens is controlled within a reasonable range by controlling the ratio of the distance from the diaphragm to the image side surface of the last lens and the sum of the air intervals on the optical axis between the first lens and any two adjacent lenses with focal power in the lens closest to the imaging surface, and the imaging quality is improved. More specifically, SD and Σ AT satisfy: 2.6 < SD/SIGMA AT < 2.9, e.g., 2.63 ≦ SD/SIGMA AT ≦ 2.88.

In the present exemplary embodiment, the on-axis distance SAG31 between the intersection of the object-side surface of the third lens and the optical axis and the effective radius vertex of the object-side surface of the third lens and the on-axis distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis and the effective radius vertex of the image-side surface of the third lens satisfy the conditional expression: 2.0 < (SAG31+ SAG32)/(SAG31-SAG32) < 3.5. The inclination angle of the third lens is effectively controlled by restricting the ratio of the on-axis distance between the intersection point of the object side surface of the third lens and the optical axis and the effective radius vertex of the object side surface of the third lens to the on-axis distance between the intersection point of the image side surface of the third lens and the optical axis and the effective radius vertex of the image side surface of the third lens, and the refraction angle of the light beam on the third lens is effectively controlled. More specifically, SAG31 and SAG32 satisfy: 2.3 < (SAG31+ SAG32)/(SAG31-SAG32) < 3.49, for example, 2.37. ltoreq (SAG31+ SAG32)/(SAG31-SAG 32). ltoreq.3.49.

In the present exemplary embodiment, the effective focal length f4 of the fourth lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy the conditional expression: 2.0 < f4/f45 < 2.5. By restricting the ratio of the combined focal length of the fourth lens and the fifth lens to the effective focal length of the fourth lens within a certain range, the curvature of field of the optical imaging lens can be reasonably controlled within a certain range. More specifically, f4 and f45 satisfy: 2.10 < f4/f45 < 2.45, for example, 2.19. ltoreq. f4/f 45. ltoreq.2.39.

In the present exemplary embodiment, the conditional expression that the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy is: 2.5 < R7/R8 < 4.1. The curvature radius of the object side surface of the fourth lens and the curvature radius of the image side surface of the fourth lens are controlled within a certain range, so that the deflection angle of light rays at the edge of the optical imaging lens can be reasonably controlled, and the sensitivity of the optical imaging lens is effectively reduced. More specifically, R7 and R8 satisfy: 2.6 < R7/R8 < 3.6, e.g., 2.71. ltoreq. R7/R8. ltoreq.3.35.

In the present exemplary embodiment, the combined focal length f345 of the third lens, the fourth lens and the fifth lens and the effective focal length f of the optical imaging lens satisfy the conditional expression: f345/f is more than 1.0 and less than 1.5. By restricting the ratio of the combined focal length of the third lens, the fourth lens and the fifth lens to the effective focal length of the optical imaging lens within a certain range, the curvature of field of the optical imaging lens can be reasonably controlled within a certain range. More specifically, f345 and f satisfy: 1.10 < f345/f < 1.4, e.g., 1.12. ltoreq. f 345/f. ltoreq.1.18.

In the present exemplary embodiment, the absolute value | OPD | of the optical distortion of the optical imaging lens satisfies the conditional expression: the < 1.5% of OPD. The optical distortion of the imaging lens is restricted to be less than 1.5%, so that the optical imaging lens has the characteristic of small distortion.

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 ultrathin thickness, large aperture and small distortion by reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, and is suitable for portable electronic products and has good imaging quality.

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 structural view of an optical imaging lens system according to embodiment 1 of the present invention, the optical imaging lens system including, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, 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. Wherein:

the first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2; the second lens E2 has negative power, and has a concave 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 concave image-side surface S6; the fourth lens element E4 has positive 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 convex 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 curvature radius, the focal length, and the thickness/distance are all in millimeters (mm):

TABLE 1

As shown in table 2, in example 1, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 5.24mm, ImgH which is half the diagonal length of the effective pixel region on the imaging surface S15 is 3.59mm, Semi-FOV which is half the maximum angle of view of the optical imaging lens is 47.8 °, the total effective focal length f of the optical imaging lens is 3.35mm, the edge thickness ET4 of the fourth lens is 2.04mm, the on-axis distance SAG 31-0.12 between the intersection point of the object-side surface and the optical axis of the third lens and the effective radius vertex of the object-side surface of the third lens, the on-axis distance SAG32 between the intersection point of the image-side surface of the third lens and the optical axis and the effective radius vertex of the image-side surface of the third lens is 0.06, the on-axis distance SAG 360.78 between the intersection point of the object-side surface of the fifth lens and the effective radius vertex of the image-side surface of the sixth lens is 3.860.25, the absolute value | OPD | -of the optical distortion of the optical imaging lens is 0.66%. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth in the following table:

TABLE 2

The optical imaging lens in embodiment 1 satisfies:

(R5+ R6)/(R5-R6) ═ 4.62, where R5 is the radius of curvature of the object-side surface of the third lens, and R6 is the radius of curvature of the image-side surface of the third lens;

SAG42/SAG11 is-6.84, wherein SAG11 is the on-axis distance between the intersection of the object-side surface of the first lens and the optical axis and the effective radius vertex of the object-side surface of the first lens, and SAG42 is the on-axis distance between the intersection of the image-side surface of the fourth lens and the optical axis and the effective radius vertex of the image-side surface of the fourth lens;

the FOV is 95.6, wherein the FOV is the maximum field angle of the optical imaging lens;

f/EPD is 2.04, wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens;

the TTL/ImgH is 1.46, where TTL is the distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical imaging lens, and ImgH is half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens;

SAG62/SAG51 is 1.62, wherein SAG51 is an on-axis distance from an intersection point of an object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens, and SAG62 is an on-axis distance from an intersection point of an image side surface of the sixth lens and the optical axis to an effective radius vertex of the image side surface of the sixth lens;

CT1/ET1 is 1.82, where ET1 is the edge thickness of the first lens and CT1 is the center thickness of the first lens on the optical axis;

f23/f1 is-2.19, wherein f23 is the combined focal length of the second lens and the third lens, and f1 is the effective focal length of the first lens;

ImgH/TD is 0.91, where ImgH is half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens, and TD is the on-axis distance from the object-side surface of the first lens to the image-side surface of the last lens in the optical imaging lens;

T56/T45 is 3.76, where T45 is the air space on the optical axis of the fourth lens and the fifth lens, and T56 is the air space on the optical axis of the fifth lens and the sixth lens;

SD/SIGMA AT is 2.63, wherein SD is the distance from the diaphragm to the image side surface of the last lens in the optical imaging lens, SIGMA AT is the sum of the air intervals on the optical axis between any two adjacent lenses with focal power in the lenses from the first lens to the lens closest to the imaging surface in the optical imaging lens;

(SAG31+ SAG32)/(SAG31-SAG32) ═ 3.49, where SAG31 is the on-axis distance between the intersection of the object-side surface of the third lens and the optical axis to the effective radius vertex of the object-side surface of the third lens, and SAG32 is the on-axis distance between the intersection of the image-side surface of the third lens and the optical axis to the effective radius vertex of the image-side surface of the third lens;

f4/f45 is 2.39, wherein f4 is the effective focal length of the fourth lens, and f45 is the combined focal length of the fourth lens and the fifth lens;

R7/R8 is 2.71, where R7 is the radius of curvature of the object-side surface of the fourth lens, and R8 is the radius of curvature of the image-side surface of the fourth lens;

f345/f is 1.12, wherein f345 is the combined focal length of the third lens, the fourth lens and the fifth lens, and f is the effective focal length 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 a4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for the respective aspheric mirror surfaces S1 through S12 in example 1:

flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.9160E-02

-4.9663E-03

-3.1661E-04

2.3395E-04

-1.5836E-05

3.5594E-05

-3.3141E-05

S2

-6.2216E-02

1.0016E-02

-3.1608E-03

1.1866E-03

-2.8637E-04

5.6698E-05

1.6410E-05

S3

-6.2048E-02

1.2237E-02

-4.1529E-03

1.6751E-03

-1.2208E-04

1.6733E-04

-6.4270E-05

S4

-3.1851E-02

1.1543E-03

-3.8906E-04

6.6161E-05

-6.7639E-06

-1.5629E-06

1.8156E-06

S5

-1.6207E-01

-7.1121E-03

2.0585E-04

8.2018E-04

2.1930E-04

7.8752E-05

-4.7838E-05

S6

-2.4069E-01

8.0174E-03

-2.4432E-03

9.7226E-04

1.8036E-04

5.9720E-04

-7.5870E-05

S7

-1.3684E-02

7.9261E-02

-1.5582E-02

2.3749E-04

-5.2639E-04

1.5958E-03

-7.9631E-04

S8

-3.2806E-01

1.6199E-01

3.8245E-02

-1.5029E-02

-3.9988E-03

-4.0198E-03

3.1556E-03

S9

3.3267E-01

-4.1113E-01

2.5260E-01

-7.9228E-02

2.5046E-02

-1.6009E-02

5.6483E-03

S10

1.5220E+00

-7.2138E-01

3.6141E-01

-1.3737E-01

4.9671E-02

-1.9489E-02

1.7240E-03

S11

-2.7983E+00

4.5715E-01

-1.5247E-01

4.0513E-03

-1.0252E-03

-1.1457E-03

-1.8556E-03

S12

-5.9567E+00

1.2328E+00

-4.3011E-01

1.4606E-01

-5.1648E-02

2.2586E-02

-1.2148E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.0895E-05

-7.8174E-06

1.1757E-05

-2.2134E-06

3.2205E-06

-4.4433E-06

1.2031E-06

S2

1.2255E-05

2.7212E-05

2.1021E-05

2.6533E-05

1.3887E-05

1.1495E-05

2.9331E-06

S3

-1.0658E-04

-4.8740E-05

8.2541E-07

3.9235E-05

3.8967E-05

2.7959E-05

5.2065E-06

S4

-3.7042E-06

1.3586E-06

1.3647E-07

-3.2637E-07

-2.5852E-07

2.8085E-08

8.1934E-08

S5

8.5819E-06

-5.4797E-06

6.3196E-06

-2.8679E-06

8.9183E-07

0.0000E+00

0.0000E+00

S6

8.2317E-05

-3.5717E-05

1.4165E-05

-1.3470E-05

3.5592E-08

0.0000E+00

0.0000E+00

S7

1.3266E-04

-2.6099E-05

8.3107E-06

-3.7850E-05

1.4768E-05

7.0249E-06

-2.5044E-06

S8

7.6869E-04

-4.3260E-05

-4.8063E-04

-2.1206E-04

4.5665E-05

7.6489E-05

1.7396E-05

S9

-1.1314E-03

1.5606E-03

-1.2003E-03

4.0368E-04

-1.6436E-04

8.9839E-05

-1.9491E-05

S10

6.7010E-04

-7.5267E-04

8.3132E-04

-5.0089E-04

1.7134E-04

6.4535E-05

-4.7996E-05

S11

-9.3109E-04

1.7350E-03

-9.8406E-04

1.7633E-04

3.5940E-04

1.8802E-04

-1.0085E-04

S12

6.8645E-03

-3.3225E-03

1.2501E-04

-7.3164E-05

5.2628E-04

-1.4921E-04

-1.0977E-05

TABLE 3

Fig. 1a 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. 1b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 1c shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 1d 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 light passes through the lens. As can be seen from fig. 1a to 1d, the optical imaging lens according to embodiment 1 can achieve good imaging quality.

Specific example 2

Fig. 2 is a schematic structural view of an optical imaging lens system according to embodiment 2 of the present invention, the optical imaging lens system including, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, 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. Wherein:

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 concave object-side surface S3 and a convex image-side surface S4; the third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6; the fourth lens element E4 has positive 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 concave object-side surface S9 and a convex image-side surface S10; the sixth lens element E6 has negative power, and has a convex 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 4, a basic parameter table of the optical imaging lens of embodiment 2 is shown, in which the curvature radius, the focal length, and the thickness/distance are all in millimeters (mm):

TABLE 4

As shown in table 5, in example 2, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 5.14mm, ImgH which is half the diagonal length of the effective pixel region on the imaging surface S15 is 3.58mm, Semi-FOV which is half the maximum angle of view of the optical imaging lens is 47.8 °, the total effective focal length f of the optical imaging lens is 3.37mm, the edge thickness ET4 of the fourth lens is 2.05mm, the on-axis distance SAG 31-0.11 between the intersection point of the object-side surface and the optical axis of the third lens and the effective radius vertex of the object-side surface of the third lens, the on-axis distance SAG32 between the intersection point of the image-side surface of the third lens and the optical axis and the effective radius vertex of the image-side surface of the third lens is SAG 0-0.04, the on-axis distance SAG 360.04 between the intersection point of the effective radius SAG 26 on the object-side surface of the fifth lens and the effective radius of the image-side surface of the sixth lens is 360.04, the absolute value | OPD | -of the optical distortion of the optical imaging lens is 0.86%. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth 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 a4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for the respective aspheric mirror surfaces S1 through S12 in example 2:

TABLE 6

Fig. 2a 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. 2b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 2c shows a distortion curve of the optical imaging lens of embodiment 2, 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 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. 2a to 2d, the optical imaging lens according to embodiment 2 can achieve good imaging quality.

Specific example 3

Fig. 3 is a schematic structural view of an optical imaging lens system according to embodiment 3 of the present invention, the optical imaging lens system including, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, 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. Wherein:

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 E2 has negative power, and has a concave 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 concave image-side surface S6; the fourth lens element E4 has positive 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 concave object-side surface S9 and a convex image-side surface S10; the sixth lens element E6 has negative power, and has a convex 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 7, which is a basic parameter table of the optical imaging lens of embodiment 3, wherein the curvature radius, the focal length, and the thickness/distance unit are all millimeters (mm):

TABLE 7

As shown in table 8, in example 3, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 5.14mm, ImgH which is half the diagonal length of the effective pixel region on the imaging surface S15 is 3.55mm, Semi-FOV which is half the maximum angle of view of the optical imaging lens is 47.8 °, the total effective focal length f of the optical imaging lens is 3.36mm, the edge thickness ET4 of the fourth lens is 2.05mm, the on-axis distance SAG31 between the intersection of the object-side surface and the optical axis of the third lens and the effective radius vertex of the object-side surface of the third lens is-0.11, the on-axis distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis and the effective radius vertex of the image-side surface of the third lens is SAG 32-0.05, the on-axis distance SAG 27 between the intersection of the object-side surface of the fifth lens and the effective radius vertex of the image-side surface of the third lens is 3, and the effective radius SAG 8678 is 360.06, the absolute value | OPD | -of the optical distortion of the optical imaging lens is 1.21%. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth 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 a4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for the respective aspheric mirror surfaces S1 through S12 in example 3:

flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.1293E-02

-5.2271E-03

-5.0504E-04

3.3973E-04

7.1191E-05

7.5659E-05

-1.2081E-05

S2

-6.7799E-02

1.1050E-02

-2.0344E-03

9.0669E-04

4.7157E-05

3.9336E-05

2.8179E-05

S3

-5.9758E-02

1.2575E-02

-2.5685E-03

9.8288E-04

-4.4551E-06

1.9422E-05

2.9244E-06

S4

-3.0353E-02

1.2319E-03

-5.1977E-04

8.3414E-05

-1.3121E-05

-7.1621E-06

4.0076E-06

S5

-1.6240E-01

-7.2810E-03

4.0540E-04

8.0477E-04

2.7248E-04

9.6080E-05

-4.6959E-05

S6

-2.4140E-01

8.0312E-03

-1.6279E-03

1.2678E-03

1.3651E-04

7.5421E-04

-1.6282E-04

S7

-1.1803E-02

7.5809E-02

-1.6821E-02

7.3822E-04

-1.3950E-03

2.2369E-03

-1.1640E-03

S8

-3.2085E-01

1.6154E-01

3.6901E-02

-1.5964E-02

-5.0728E-03

-3.5769E-03

3.3256E-03

S9

3.2642E-01

-4.1213E-01

2.5119E-01

-7.9787E-02

2.5038E-02

-1.6088E-02

5.7071E-03

S10

1.5839E+00

-7.4635E-01

3.5173E-01

-1.3847E-01

5.0768E-02

-1.9266E-02

2.3984E-03

S11

-2.8268E+00

5.0757E-01

-1.4769E-01

8.0947E-03

1.3620E-03

-1.2627E-03

-6.1702E-04

S12

-5.9549E+00

1.2406E+00

-4.3123E-01

1.4034E-01

-4.9205E-02

2.2535E-02

-1.1978E-02

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.3539E-05

-1.3770E-05

2.4960E-06

-6.2564E-06

1.4765E-06

-3.2929E-06

3.1382E-06

S2

6.9954E-06

5.7709E-06

-9.7839E-07

-2.9302E-06

-4.7415E-07

1.7063E-06

1.4570E-06

S3

-4.7025E-05

-4.9736E-05

-5.5791E-05

-4.3896E-05

-3.2566E-05

-1.8685E-05

-8.0420E-06

S4

-1.4175E-07

2.7904E-06

1.6202E-06

2.9348E-06

6.5639E-07

-4.9652E-07

-1.4788E-06

S5

-7.8710E-06

-1.3850E-05

-5.8174E-06

-4.2898E-06

-2.6835E-06

0.0000E+00

0.0000E+00

S6

4.7528E-05

-6.8617E-05

8.8891E-06

-1.5232E-05

1.0895E-06

0.0000E+00

0.0000E+00

S7

1.6361E-04

3.9958E-05

-1.7410E-06

-4.9246E-05

8.6272E-06

1.9166E-05

-9.0738E-06

S8

7.9091E-04

-5.6409E-05

-4.5788E-04

-1.1601E-04

4.2218E-05

5.0149E-05

-2.0245E-05

S9

-1.0708E-03

1.5810E-03

-1.1992E-03

4.0178E-04

-1.6795E-04

8.8625E-05

-1.8868E-05

S10

5.9088E-04

-6.3837E-04

8.7111E-04

-5.2023E-04

1.9928E-04

6.6501E-05

-4.7650E-05

S11

-7.0779E-04

1.7844E-03

-1.2447E-03

2.3925E-04

3.6108E-04

1.9397E-04

-1.6825E-04

S12

7.0905E-03

-3.3342E-03

1.5905E-04

-7.0052E-05

5.4092E-04

-1.5634E-04

-1.4141E-05

TABLE 9

Fig. 3a 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. 3b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 3c shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 3d 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. 3a to 3d, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Specific example 4

Fig. 4 is a schematic structural view of an optical imaging lens system according to embodiment 4 of the present invention, the optical imaging lens system including, arranged sequentially from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, 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. Wherein:

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 concave image-side surface S6; the fourth lens element E4 has positive 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 convex 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 10, a basic parameter table of the optical imaging lens of embodiment 4 is shown, in which the curvature radius, the focal length, and the thickness/distance are all in millimeters (mm):

watch 10

As shown in table 11, in example 4, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 is 5.06mm, ImgH which is half the diagonal length of the effective pixel region on the imaging surface S15 is 3.39mm, Semi-FOV which is half the maximum angle of view of the optical imaging lens is 47.8 °, the total effective focal length f of the optical imaging lens is 3.20mm, the edge thickness ET4 of the fourth lens is 2.05mm, the on-axis distance SAG31 between the intersection of the object-side surface and the optical axis of the third lens and the effective radius vertex of the object-side surface of the third lens is-0.09, the on-axis distance SAG32 between the intersection of the image-side surface of the third lens and the optical axis and the effective radius vertex of the image-side surface of the third lens is SAG 32-0.05, the on-axis distance SAG 360.13 between the intersection of the object-side surface of the fifth lens and the effective radius of the image-side surface of the sixth lens is 360.8613, the absolute value | OPD | -of the optical distortion of the optical imaging lens is 1.20%. The parameters of each relationship are as illustrated in the exemplary embodiments, and the values of each relationship are as set forth 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 to the sixth lens element E6 are aspheric, and table 12 shows the high-order term coefficients a4, A6, A8, a10, a12, a14, a16, a18, a20, a22, a24, a26, a28, and a30 that can be used for the respective aspheric mirror surfaces S1 to S12 in example 4:

TABLE 12

Fig. 4a 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. 4b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 4c shows a distortion curve of the optical imaging lens of embodiment 4, 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 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4a to 4d, the optical imaging lens system of embodiment 4 can achieve good imaging quality.

The optical imaging lens provided by the invention mentioned in the above embodiments includes a plurality of lenses, such as the first lens to the sixth lens, wherein the low-order aberration of the lens can be effectively balanced and controlled by reasonably controlling the positive and negative distribution of the focal power of each lens in the lens, and the optical imaging lens has the characteristics of ultrathin thickness, large aperture and small distortion, is suitable for portable electronic products, is an optical imaging lens with good imaging quality, and has good adaptability.

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 (10)

1. An optical imaging lens, comprising, disposed along an optical axis:

a first lens having an optical power;

a second lens having a negative optical power;

a diaphragm;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens having a positive optical power;

a sixth lens having optical power;

wherein the radius of curvature R5 of the object-side surface of the third lens element and the radius of curvature R6 of the image-side surface of the third lens element satisfy: 3.5 < (R5+ R6)/(R5-R6) < 5.0;

an on-axis distance SAG11 from an intersection point of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens to an on-axis distance SAG42 from an intersection point of the image-side surface of the fourth lens and the optical axis to an effective radius vertex of the image-side surface of the fourth lens satisfies: -5.5 < SAG42/SAG11 < -3.5.

2. The optical imaging lens of claim 1, wherein the maximum field angle FOV of the optical imaging lens satisfies: FOV > 90.

3. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2.5.

4. The optical imaging lens of claim 1, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy: TTL/ImgH is less than 1.6.

5. The optical imaging lens of claim 1, wherein an on-axis distance SAG51 from an intersection point of an object-side surface of the fifth lens and the optical axis to an effective radius vertex of the object-side surface of the fifth lens to an on-axis distance SAG62 from an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of an image-side surface of the sixth lens satisfies: 0.5 < SAG62/SAG51 < 2.0.

6. The optical imaging lens of claim 1, wherein the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 1.5 < CT1/ET1 < 2.0.

7. The optical imaging lens of claim 1, wherein the combined focal length f23 of the second lens and the third lens and the effective focal length f1 of the first lens satisfy: -3.0 < f23/f1 < -2.0.

8. The optical imaging lens of claim 1, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, and the on-axis distance TD from the object side surface of the first lens to the image side surface of the last lens in the optical imaging lens satisfy: imgH/TD is more than 0.5 and less than 1.0.

9. The optical imaging lens of claim 1, wherein an air interval T45 between the fourth lens and the fifth lens on the optical axis and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3.7 < T56/T45 < 8.1.

10. The optical imaging lens of claim 1, wherein a sum Σ AT of a distance SD from the stop to an image side surface of a last lens in the optical imaging lens and an air interval on the optical axis between any two adjacent lenses having optical powers in the first lens to a lens closest to an image plane in the optical imaging lens satisfies: 2.5 < SD/∑ AT < 3.0.

Images