CN212675263U

CN212675263U - Optical imaging lens group

Info

Publication number: CN212675263U
Application number: CN202021982381.5U
Authority: CN
Inventors: 孟祥月; 宋立通; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-03-09
Anticipated expiration: 2030-09-11

Abstract

The application discloses an optical imaging lens assembly, which comprises, in order from an object side to an image side along an optical axis: a first lens having a negative optical power; a second lens having an optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is concave; and a sixth lens having a refractive power, an object side surface of which is convex. The maximum field angle FOV of the optical imaging lens group satisfies: 92 < FOV < 116. Half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group, the total effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group satisfy: ImgH × EPD/f < 1 mm.

Description

Optical imaging lens group

Technical Field

The application relates to the field of optical elements, in particular to an optical imaging lens group.

Background

In recent years, with the rapid development of electronic products, portable and wearable electronic products such as smartphones and smartwatches have rapidly spread. At present, electronic products such as smart phones and smart watches have become necessities in daily life of users. Meanwhile, suppliers of many electronic products invest a lot of time and energy in product innovation to improve their product competitiveness, and among them, improving the imaging quality of portable and wearable electronic products becomes a core competitiveness of many suppliers.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having an optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is concave; and a sixth lens having a refractive power, an object side surface of which is convex. The maximum field angle FOV of the optical imaging lens group may satisfy: 92 ° < FOV < 116 °; and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group, the total effective focal length f of the optical imaging lens group, and the entrance pupil diameter EPD of the optical imaging lens group can satisfy: ImgH × EPD/f < 1 mm.

In one embodiment, the object-side surface of the first lens element and the image-side surface of the sixth lens element have at least one aspheric mirror surface.

In one embodiment, the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging lens group satisfy: -1.5 < f/f5 < 0.

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens may satisfy: 0 < f3/(f1+ f3) < 1.0.

In one embodiment, the total effective focal length f of the optical imaging lens group and the effective focal length f2 of the second lens can satisfy: f/f2 is more than 0.3 and less than 1.3.

In one embodiment, the maximum effective radius DT12 of the image-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy: 0 < DT12/R2 < 1.0.

In one embodiment, a distance SAG12 on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the effective radius vertex of the image-side surface of the first lens and a distance SAG51 on the optical axis from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius vertex of the object-side surface of the fifth lens may satisfy: 0.3 < SAG51/(SAG51-SAG12) < 0.8.

In one embodiment, the maximum effective radius DT42 of the image-side surface of the fourth lens and the maximum effective radius DT61 of the object-side surface of the sixth lens may satisfy: 0.5 < DT42/DT61 < 1.0.

In one embodiment, the central thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens can satisfy: 0.2 < ET4/CT4 < 0.7.

In one embodiment, the edge thickness ET5 of the fifth lens and the maximum effective radius DT51 of the object side surface of the fifth lens may satisfy: 0.2 < ET5/DT51 < 1.0.

In one embodiment, the radius of curvature R8 of the image-side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: -1.5 < R8/f4 < 0.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens may satisfy: 0.5 < R2/R3 < 1.5.

In one embodiment, the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R9 of the object-side surface of the fifth lens may satisfy: 0 < R8/R9 < 1.0.

In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens may satisfy: 0.3 < R12/R11 < 1.3.

In one embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis may satisfy: 0.2 < CT2/(CT1+ CT3+ CT5) < 1.0.

In one embodiment, the optical imaging lens group further includes a stop, and a distance SD on the optical axis from the stop to the image side surface of the sixth lens and a distance TD on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens satisfy: SD/TD is more than 0.5 and less than 1.0.

Another aspect of the present application provides an optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having an optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is concave; and a sixth lens having a refractive power, an object side surface of which is convex. The maximum field angle FOV of the optical imaging lens group may satisfy: 92 < FOV < 116. The distance SAG12 on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens and the distance SAG51 on the optical axis from the intersection point of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens can satisfy: 0.3 < SAG51/(SAG51-SAG12) < 0.8.

In one embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group, the total effective focal length f of the optical imaging lens group, and the entrance pupil diameter EPD of the optical imaging lens group may satisfy: ImgH × EPD/f < 1 mm.

The optical imaging lens group has at least one beneficial effect of large field angle, miniaturization, high imaging quality and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the on-axis distance between each lens and the like of each lens.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic structural view of an optical imaging lens group according to embodiment 1 of the present application;

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

fig. 3 shows a schematic structural view of an optical imaging lens group according to embodiment 2 of the present application;

fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens group of embodiment 2;

fig. 5 is a schematic view showing a structure of an optical imaging lens group according to embodiment 3 of the present application;

fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens group of embodiment 3;

fig. 7 is a schematic view showing a structure of an optical imaging lens group according to embodiment 4 of the present application;

fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens group of embodiment 4;

fig. 9 is a schematic view showing a structure of an optical imaging lens group according to embodiment 5 of the present application;

fig. 10A to 10D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens group of example 5;

fig. 11 is a schematic view showing a structure of an optical imaging lens group according to embodiment 6 of the present application; and

fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens group of example 6.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

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

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens 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.

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.

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 in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

The optical imaging lens group according to an exemplary embodiment of the present application may include six lenses having optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, respectively. The six lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the sixth lens can have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a negative power; the second lens may have a positive or negative optical power; the third lens may have a negative optical power; the fourth lens may have a positive power or a negative power; the fifth lens can have negative focal power, and the object side surface of the fifth lens can be a concave surface; and the sixth lens can have positive power or negative power, and the object side surface can be a convex surface. Through reasonably setting the focal power and the surface type characteristics of each lens, the optical imaging lens group is beneficial to balancing and correcting various aberrations of the optical imaging lens group, and the imaging quality of the optical imaging lens group is beneficial to being improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 92 < FOV < 116 °, where FOV is the maximum field angle of the optical imaging lens group. More specifically, the FOV may further satisfy: 104 < FOV < 113. The wide-angle optical lens meets the condition that the FOV is more than 92 degrees and less than 116 degrees, is favorable for realizing wide-angle characteristics and is favorable for enlarging the imaging range on an imaging surface.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: ImgH × EPD/f < 1mm, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group, f is the total effective focal length of the optical imaging lens group, and EPD is the entrance pupil diameter of the optical imaging lens group. More specifically, ImgH, EPD and f may further satisfy: ImgH × EPD/f < 0.9 mm. The requirement of ImgH multiplied by EPD/f is less than 1mm, which is beneficial to realizing miniaturization.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -1.5 < f/f5 < 0, wherein f5 is the effective focal length of the fifth lens and f is the total effective focal length of the optical imaging lens group. More specifically, f and f5 further satisfy: -1.0 < f/f5 < -0.3. Satisfying-1.5 < f/f5 < 0, which is beneficial to reducing the vertical axis chromatic aberration of the lens group.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0 < f3/(f1+ f3) < 1.0, where f1 is the effective focal length of the first lens and f3 is the effective focal length of the third lens. More specifically, f1 and f3 may further satisfy: 0.5 < f3/(f1+ f3) < 0.9. The requirements of f3/(f1+ f3) being more than 0 and less than 1.0 are met, the axial chromatic aberration of the lens group is favorably reduced, and the imaging performance of the optical imaging lens group is improved.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < f/f2 < 1.3, where f is the total effective focal length of the optical imaging lens group, and f2 is the effective focal length of the second lens. More specifically, f and f2 further satisfy: f/f2 is more than 0.4 and less than 1.2. Satisfying 0.3 < f/f2 < 1.3 is beneficial to reducing the vertical axis chromatic aberration of the lens group and simultaneously beneficial to the miniaturization design of the lens group.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0 < DT12/R2 < 1.0, where DT12 is the maximum effective radius of the image-side surface of the first lens and R2 is the radius of curvature of the image-side surface of the first lens. More specifically, DT12 and R2 further satisfy: 0.2 < DT12/R2 < 0.7. The requirements of 0 < DT12/R2 < 1.0 are met, the production and the processing of the lens group are facilitated, and meanwhile, the off-axis curvature of field of the lens group is also facilitated to be reduced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < SAG51/(SAG51-SAG12) < 0.8, wherein SAG12 is a distance on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the effective radius vertex of the image-side surface of the first lens, and SAG51 is a distance on the optical axis from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius vertex of the object-side surface of the fifth lens. More specifically, SAG51 and SAG12 further may satisfy: 0.3 < SAG51/(SAG51-SAG12) < 0.7. The requirements of 0.3 < SAG51/(SAG51-SAG12) < 0.8 are met, and the manufacturability and the imaging quality of the lens group are favorably improved. If SAG51/(SAG51-SAG12) > 0.8, poor manufacturability is easily caused; if SAG51/(SAG51-SAG12) < 0.3, it is not beneficial to correct the curvature of field of the off-axis visual field.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < DT42/DT61 < 1.0, where DT42 is the maximum effective radius of the image-side surface of the fourth lens and DT61 is the maximum effective radius of the object-side surface of the sixth lens. More specifically, DT42 and DT61 further satisfy: 0.6 < DT42/DT61 < 0.9. The size of the lens group is favorably limited and the processing manufacturability requirement of the lens group is favorably met by meeting the DT42/DT61 of 0.5 and less than 1.0.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.2 < ET4/CT4 < 0.7, wherein CT4 is the central thickness of the fourth lens on the optical axis and ET4 is the edge thickness of the fourth lens. More specifically, ET4 and CT4 further satisfy: 0.2 < ET4/CT4 < 0.5. The requirements of 0.2 < ET4/CT4 < 0.7 are met, the requirements of the processing manufacturability of the lens group can be ensured, and the monochromatic aberration of the lens group can be reduced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.2 < ET5/DT51 < 1.0, wherein ET5 is the edge thickness of the fifth lens and DT51 is the maximum effective radius of the object side of the fifth lens. More specifically, ET5 and DT51 further satisfy: 0.4 < ET5/DT51 < 0.8. The requirements of 0.2 < ET5/DT51 < 1.0 are met, the processing manufacturability requirement of the lens group can be ensured, and the influence of ghost images can be reduced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 1.5 < R8/f4 < 0, wherein R8 is the radius of curvature of the image side surface of the fourth lens, and f4 is the effective focal length of the fourth lens. More specifically, R8 and f4 may further satisfy: -1.0 < R8/f4 < -0.7. The requirement that R8/f4 is more than-1.5 and less than 0 is met, and the axial chromatic aberration is reduced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < R2/R3 < 1.5, wherein R2 is the radius of curvature of the image-side surface of the first lens and R3 is the radius of curvature of the object-side surface of the second lens. More specifically, R2 and R3 may further satisfy: 0.5 < R2/R3 < 1.2. The requirement that R2/R3 is more than 0.5 and less than 1.5 is met, and the spherical aberration is favorably reduced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0 < R8/R9 < 1.0, wherein R8 is the radius of curvature of the image-side surface of the fourth lens, and R9 is the radius of curvature of the object-side surface of the fifth lens. More specifically, R8 and R9 may further satisfy: 0.1 < R8/R9 < 0.7. The condition that R8/R9 is more than 0 and less than 1.0 is met, the field curvature is favorably corrected, and the influence of ghost images is reduced.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < R12/R11 < 1.3, wherein R11 is a radius of curvature of an object-side surface of the sixth lens, and R12 is a radius of curvature of an image-side surface of the sixth lens. More specifically, R12 and R11 may further satisfy: 0.5 < R12/R11 < 1.0. The requirement of R12/R11 being more than 0.3 and less than 1.3 is met, the miniaturization can be realized, and the field curvature can be corrected.

In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.2 < CT2/(CT1+ CT3+ CT5) < 1.0, where CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis. More specifically, CT2, CT1, CT3, and CT5 may further satisfy: 0.3 < CT2/(CT1+ CT3+ CT5) < 0.8. The requirements of 0.2 < CT2/(CT1+ CT3+ CT5) < 1.0 are met, the processability of the lens group is favorably ensured, and the reduction of the vertical axis chromatic aberration and the axial chromatic aberration of the lens group is favorably realized.

In an exemplary embodiment, the optical imaging lens group further comprises a stop, the optical imaging lens group according to the present application may satisfy: 0.5 < SD/TD < 1.0, wherein SD is the distance between the diaphragm and the image side surface of the sixth lens on the optical axis, and TD is the distance between the object side surface of the first lens and the image side surface of the sixth lens on the optical axis. More specifically, SD and TD may further satisfy: SD/TD is more than 0.7 and less than 0.9. SD/TD is more than 0.5 and less than 1.0, which is beneficial to reducing astigmatism and enabling the lens group to have smaller optical total length.

In an exemplary embodiment, an optical imaging lens group according to the present application further includes a stop disposed between the first lens and the second lens. Optionally, the optical imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on an imaging surface.

The optical imaging lens group according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. 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, the volume of the optical imaging lens group can be effectively reduced, and the processability of the optical imaging lens group can be improved, so that the optical imaging lens group is more favorable for production and processing and can be suitable for portable electronic products. The optical imaging lens group configured as described above can have features such as ultra wide angle, miniaturization, good imaging quality, and the like.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, and the imaging quality is further improved. 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, second, third, fourth, fifth, and sixth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging lens group can 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 group is not limited to including six lenses. The optical imaging lens group may also include other numbers of lenses, if desired.

Specific examples of the optical imaging lens group applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic structural diagram of an optical imaging lens group according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging lens assembly, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive 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 convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave 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 surface S15.

Table 1 shows a basic parameter table of the optical imaging lens group of embodiment 1, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 1

In the present example, the total effective focal length f of the optical imaging lens group is 1.80mm, the total length TTL of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging lens group) is 4.00mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S15 of the optical imaging lens group is 1.81mm, the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 2.08, and the maximum field angle FOV of the optical imaging lens group is 105.0 °.

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 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S12 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄And A₁₆。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

7.7747E-01

-1.7731E+00

4.5300E+00

-1.0388E+01

1.6144E+01

-1.4271E+01

5.3862E+00

S2

1.1910E+00

-2.6945E+00

1.7573E+01

-1.0960E+02

4.6058E+02

-1.0665E+03

1.0278E+03

S3

1.4690E-01

6.0499E-01

-1.5051E+01

1.2801E+02

-6.1215E+02

1.5172E+03

-1.5103E+03

S4

-3.9058E-01

-6.3239E-01

4.7100E+00

-2.4821E+01

8.1457E+01

-1.4731E+02

1.2139E+02

S5

-5.7857E-01

-1.6365E+00

1.0815E+01

-6.1321E+01

2.1341E+02

-3.7745E+02

2.7591E+02

S6

-3.6154E-01

4.5116E-01

-1.4900E+00

3.7586E+00

-6.0426E+00

8.3389E+00

-4.5535E+00

S7

-3.3081E-01

1.3358E+00

-3.6588E+00

7.1695E+00

-1.1305E+01

1.2047E+01

-5.6013E+00

S8

-3.2198E-01

1.1772E+00

-2.4669E+00

3.7624E+00

-3.2469E+00

9.5898E-01

2.0144E-01

S9

3.1540E-01

-1.1292E+00

2.7505E+00

-5.5397E+00

7.6779E+00

-6.5365E+00

2.3984E+00

S10

5.0326E-01

-1.5081E+00

2.3731E+00

-2.3993E+00

1.4891E+00

-5.0732E-01

7.1965E-02

S11

-1.0291E+00

1.0676E+00

-1.0891E+00

8.7966E-01

-4.2390E-01

1.0698E-01

-1.1037E-02

S12

-5.1896E-01

5.6669E-01

-5.1541E-01

3.3386E-01

-1.4262E-01

3.5466E-02

-3.7931E-03

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 1, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging lens group of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 1, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 2A to 2D, the optical imaging lens assembly of embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural view of an optical imaging lens group according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging lens assembly, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex 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 negative power, and has a concave object-side surface S9 and a concave 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 surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 1.75mm, the total length TTL of the optical imaging lens group is 3.98mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 1.85mm, the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 2.20, and the maximum field angle FOV of the optical imaging lens group is 112.0 °.

Table 3 shows a basic parameter table of the optical imaging lens group of embodiment 2, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

TABLE 4

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 2, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging lens group of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 2, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging lens assembly of embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural view of an optical imaging lens group according to embodiment 3 of the present application.

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

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex 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 convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive 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 surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 1.86mm, the total length TTL of the optical imaging lens group is 4.10mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 1.85mm, the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 2.25, and the maximum field angle FOV of the optical imaging lens group is 110.0 °.

Table 5 shows a basic parameter table of the optical imaging lens group of embodiment 3, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.9099E-01

-8.3180E-01

1.1823E+00

-1.3561E+00

1.0581E+00

-4.6290E-01

8.9152E-02

4.9099E-01

-8.3180E-01

S2

7.5746E-01

-9.0734E-01

3.5042E+00

-1.7770E+01

8.3955E+01

-2.1433E+02

2.3441E+02

7.5746E-01

-9.0734E-01

S3

6.6725E-02

1.0576E+00

-2.3965E+01

2.0038E+02

-9.5947E+02

2.4125E+03

-2.5326E+03

6.6725E-02

1.0576E+00

S4

-2.7110E-01

-4.8767E-01

3.0271E+00

-2.3087E+01

8.0401E+01

-1.3052E+02

5.2922E+01

-2.7110E-01

-4.8767E-01

S5

-3.0851E-01

-1.3065E+00

4.5839E+00

-1.2785E+01

2.0242E+01

-2.2561E+00

-1.4670E+01

-3.0851E-01

-1.3065E+00

S6

-1.1288E-01

-5.8434E-01

1.7157E+00

-3.1982E+00

4.4253E+00

-2.7792E+00

5.3644E-01

-1.1288E-01

-5.8434E-01

S7

-1.8121E-01

6.1869E-01

-1.8154E+00

4.2619E+00

-6.3781E+00

5.0014E+00

-1.5489E+00

-1.8121E-01

6.1869E-01

S8

-5.0879E-01

1.4354E+00

-2.6891E+00

3.4159E+00

-1.7774E+00

-4.7854E-01

5.7331E-01

-5.0879E-01

1.4354E+00

S9

1.9835E-01

-7.5079E-01

1.3429E+00

-1.3302E+00

7.7644E-01

-3.9330E-01

1.0841E-01

1.9835E-01

-7.5079E-01

S10

4.4953E-01

-1.1929E+00

1.7222E+00

-1.4798E+00

7.6008E-01

-2.1749E-01

2.6764E-02

4.4953E-01

-1.1929E+00

S11

-8.1408E-01

6.8110E-01

-5.8576E-01

4.3336E-01

-1.9649E-01

4.6686E-02

-4.4925E-03

-8.1408E-01

6.8110E-01

S12

-3.7484E-01

2.6634E-01

-1.4637E-01

5.6940E-02

-1.5960E-02

2.8240E-03

-2.2676E-04

-3.7484E-01

2.6634E-01

TABLE 6

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

Example 4

An optical imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural diagram of an optical imaging lens group according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging lens assembly, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex 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 convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave 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 surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 1.81mm, the total length TTL of the optical imaging lens group is 4.10mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 1.82mm, the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 2.20, and the maximum field angle FOV of the optical imaging lens group is 106.0 °.

Table 7 shows a basic parameter table of the optical imaging lens group of embodiment 4, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 4, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 4. Fig. 8C shows a distortion curve of the optical imaging lens group of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 4, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 8A to 8D, the optical imaging lens assembly according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural view of an optical imaging lens group according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging lens assembly, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex 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 convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative 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 surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 1.66mm, the total length TTL of the optical imaging lens group is 4.29mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 1.82mm, the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 2.20, and the maximum field angle FOV of the optical imaging lens group is 110.0 °.

Table 9 shows a basic parameter table of the optical imaging lens group of embodiment 5, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

4.7016E-01

-4.6297E-01

5.9546E-01

-4.0313E-01

1.9662E-02

1.7843E-01

-1.0425E-01

S2

9.2868E-01

-6.7775E-01

1.0822E+01

-7.4929E+01

3.6375E+02

-8.8244E+02

9.1652E+02

S3

3.6264E-02

-1.0573E+00

1.3026E+01

-1.0860E+02

4.7481E+02

-1.0741E+03

9.3299E+02

S4

-6.4272E-01

2.6450E-01

-6.5121E-01

4.9504E+00

-4.4504E+01

1.4311E+02

-1.7244E+02

S5

-6.6686E-01

2.7957E-01

-1.4465E+00

9.8959E+00

-4.3086E+01

9.0270E+01

-7.0673E+01

S6

-4.6691E-01

8.5863E-01

-2.3844E+00

6.5823E+00

-1.1894E+01

1.2028E+01

-4.9982E+00

S7

-2.7275E-01

7.3041E-01

-1.9035E+00

3.5134E+00

-4.3177E+00

2.9981E+00

-8.8976E-01

S8

5.4403E-02

2.9408E-01

-1.1810E+00

1.8470E+00

-1.4534E+00

5.4085E-01

-8.3147E-02

S9

4.9210E-01

-1.2627E+00

7.9409E-01

-1.7836E-01

-2.7463E-01

2.5596E-01

0.0000E+00

S10

6.1977E-01

-1.7398E+00

2.0477E+00

-1.4071E+00

5.7523E-01

-1.3519E-01

1.5051E-02

S11

-7.4282E-01

4.2242E-01

-2.8951E-01

5.0654E-01

-4.7076E-01

1.8740E-01

-2.7359E-02

S12

-5.0853E-01

5.0095E-01

-3.3702E-01

1.4741E-01

-3.9092E-02

4.5221E-03

0.0000E+00

Watch 10

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

Example 6

An optical imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic structural view of an optical imaging lens group according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging lens assembly, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive 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 convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive 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 surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 1.56mm, the total length TTL of the optical imaging lens group is 4.41mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 1.72mm, the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 2.30, and the maximum field angle FOV of the optical imaging lens group is 104.9 °.

Table 11 shows a basic parameter table of the optical imaging lens group of example 6, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

5.6505E-01

-7.0949E-01

9.0359E-01

-6.9133E-01

1.9458E-01

1.0076E-01

-6.3413E-02

S2

9.0466E-01

-2.7660E-01

2.2465E+00

-1.7383E+01

1.1100E+02

-2.9182E+02

3.0689E+02

S3

-1.6669E-02

1.4405E-02

-2.1830E+00

3.4172E+01

-2.5650E+02

8.7488E+02

-1.1056E+03

S4

-6.9030E-01

1.7042E+00

-1.4248E+01

8.2528E+01

-2.9869E+02

6.0617E+02

-5.0424E+02

S5

-8.9398E-01

2.1376E+00

-1.8113E+01

9.0362E+01

-2.8322E+02

4.9513E+02

-3.6565E+02

S6

-6.5196E-01

2.5205E+00

-9.7566E+00

2.6421E+01

-4.2098E+01

3.5974E+01

-1.2459E+01

S7

-4.1056E-01

1.4937E+00

-4.4661E+00

8.9015E+00

-1.1156E+01

7.7419E+00

-2.2869E+00

S8

2.9140E-01

-1.1051E+00

2.6046E+00

-4.0252E+00

3.7926E+00

-1.9442E+00

3.9431E-01

S9

5.7254E-01

-2.5305E+00

4.4708E+00

-5.4399E+00

3.5096E+00

-8.2264E-01

0.0000E+00

S10

4.1536E-01

-1.2472E+00

1.7474E+00

-1.5623E+00

8.7133E-01

-2.7217E-01

3.5951E-02

S11

-9.2102E-01

1.0827E+00

-8.1352E-01

3.9316E-01

-1.2657E-01

2.9442E-02

-4.3128E-03

S12

-5.0760E-01

5.3113E-01

-3.7351E-01

1.5699E-01

-3.4869E-02

2.9216E-03

0.0000E+00

TABLE 12

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 6, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 6. Fig. 12C shows a distortion curve of the optical imaging lens group of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 6, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging lens group according to embodiment 6 can achieve good imaging quality.

In summary, examples 1 to 6 each satisfy the relationship shown in table 13.

Conditions/examples	1	2	3	4	5	6
							ImgH×EPD/f(mm)	0.87	0.84	0.82	0.83	0.83	0.75
SD/TD	0.82	0.77	0.81	0.82	0.76	0.75
							f/f5	-0.52	-0.98	-0.43	-0.66	-0.36	-0.75
f3/(f1+f3)	0.65	0.67	0.69	0.74	0.58	0.83
							f/f2	0.53	1.15	0.84	0.61	0.75	0.50
DT12/R2	0.28	0.61	0.26	0.35	0.42	0.35
							SAG51/(SAG51-SAG12)	0.67	0.41	0.54	0.63	0.61	0.55
DT42/DT61	0.64	0.77	0.63	0.80	0.79	0.69
							ET4/CT4	0.46	0.45	0.45	0.40	0.31	0.36
ET5/DT51	0.59	0.52	0.65	0.66	0.43	0.74
							R8/f4	-0.90	-0.73	-0.92	-0.94	-0.85	-0.84
R2/R3	1.04	0.53	1.18	0.59	0.65	1.06
							R8/R9	0.54	0.28	0.61	0.23	0.36	0.19
R12/R11	0.85	0.64	0.94	0.62	0.59	0.88
							CT2/(CT1+CT3+CT5)	0.76	0.76	0.46	0.55	0.50	0.37

Watch 13

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

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a negative optical power;

a second lens having an optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens element having a negative refractive power, the object-side surface of which is concave; and

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

the maximum field angle FOV of the optical imaging lens group satisfies: 92 ° < FOV < 116 °; and

half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group, the total effective focal length f of the optical imaging lens group, and the entrance pupil diameter EPD of the optical imaging lens group satisfy: ImgH × EPD/f < 1 mm.

2. The optical imaging lens group of claim 1, wherein the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging lens group satisfy: -1.5 < f/f5 < 0.

3. The optical imaging lens group of claim 1, wherein the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0 < f3/(f1+ f3) < 1.0.

4. The optical imaging lens group of claim 1 wherein the total effective focal length f of the optical imaging lens group and the effective focal length f2 of the second lens satisfy: f/f2 is more than 0.3 and less than 1.3.

5. The optical imaging lens group of claim 1, wherein the maximum effective radius DT12 of the image side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0 < DT12/R2 < 1.0.

6. The optical imaging lens group of claim 1, wherein a distance SAG12 on the optical axis from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens to a distance SAG51 on the optical axis from an intersection point of the 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 satisfies: 0.3 < SAG51/(SAG51-SAG12) < 0.8.

7. The optical imaging lens group of claim 1, wherein the maximum effective radius DT42 of the image side surface of the fourth lens and the maximum effective radius DT61 of the object side surface of the sixth lens satisfy: 0.5 < DT42/DT61 < 1.0.

8. The optical imaging lens group of claim 1 wherein a center thickness CT4 of the fourth lens on the optical axis and an edge thickness ET4 of the fourth lens satisfy: 0.2 < ET4/CT4 < 0.7.

9. The optical imaging lens group of claim 1, wherein the edge thickness ET5 of the fifth lens and the maximum effective radius DT51 of the object side surface of the fifth lens satisfy: 0.2 < ET5/DT51 < 1.0.

10. The optical imaging lens group of claim 1, wherein the radius of curvature R8 of the image side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: -1.5 < R8/f4 < 0.

11. The optical imaging lens group of claim 1, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 0.5 < R2/R3 < 1.5.

12. The optical imaging lens group of claim 1, wherein the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R9 of the object-side surface of the fifth lens satisfy: 0 < R8/R9 < 1.0.

13. The optical imaging lens group of claim 1, wherein the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.3 < R12/R11 < 1.3.

14. The optical imaging lens group of any one of claims 1-13 wherein the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.2 < CT2/(CT1+ CT3+ CT5) < 1.0.

15. The optical imaging lens group of any one of claims 1-13, further comprising a stop, wherein a distance SD on the optical axis from the stop to an image side surface of the sixth lens and a distance TD on the optical axis from an object side surface of the first lens to an image side surface of the sixth lens satisfy: SD/TD is more than 0.5 and less than 1.0.

16. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a negative optical power;

a second lens having an optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a distance SAG12 on the optical axis from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens to a distance SAG51 on the optical axis from an intersection point of the 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 satisfies: 0.3 < SAG51/(SAG51-SAG12) < 0.8.

17. The optical imaging lens group of claim 16 wherein the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging lens group satisfy: -1.5 < f/f5 < 0.

18. The optical imaging lens group of claim 16 wherein the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0 < f3/(f1+ f3) < 1.0.

19. The optical imaging lens group of claim 16 wherein the total effective focal length f of the optical imaging lens group and the effective focal length f2 of the second lens satisfy: f/f2 is more than 0.3 and less than 1.3.

20. The optical imaging lens group of claim 16, wherein the maximum effective radius DT12 of the image side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0 < DT12/R2 < 1.0.

21. The optical imaging lens group of claim 16, wherein the maximum effective radius DT42 of the image side surface of the fourth lens and the maximum effective radius DT61 of the object side surface of the sixth lens satisfy: 0.5 < DT42/DT61 < 1.0.

22. The optical imaging lens group of claim 16 wherein a center thickness CT4 of the fourth lens on the optical axis and an edge thickness ET4 of the fourth lens satisfy: 0.2 < ET4/CT4 < 0.7.

23. The optical imaging lens group of claim 16, wherein the edge thickness ET5 of the fifth lens and the maximum effective radius DT51 of the object side surface of the fifth lens satisfy: 0.2 < ET5/DT51 < 1.0.

24. The optical imaging lens group of claim 16, wherein the radius of curvature R8 of the image side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: -1.5 < R8/f4 < 0.

25. The optical imaging lens group of claim 16 wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 0.5 < R2/R3 < 1.5.

26. The optical imaging lens group of claim 16, wherein the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R9 of the object-side surface of the fifth lens satisfy: 0 < R8/R9 < 1.0.

27. The optical imaging lens group of claim 16 wherein the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.3 < R12/R11 < 1.3.

28. The optical imaging lens group of any one of claims 16-27 wherein the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.2 < CT2/(CT1+ CT3+ CT5) < 1.0.

29. The optical imaging lens group of any one of claims 16-27, further comprising a stop, wherein a distance SD on the optical axis from the stop to an image side surface of the sixth lens and a distance TD on the optical axis from an object side surface of the first lens to an image side surface of the sixth lens satisfy: SD/TD is more than 0.5 and less than 1.0.

30. The optical imaging lens group of any one of claims 17-27 wherein the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group, the total effective focal length f of the optical imaging lens group, and the entrance pupil diameter EPD of the optical imaging lens group satisfy: ImgH × EPD/f < 1 mm.