CN113189749A

CN113189749A - Camera lens group

Info

Publication number: CN113189749A
Application number: CN202110554705.8A
Authority: CN
Inventors: 李阳; 孙叶萍; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-07-30

Abstract

The invention discloses a photographic lens assembly, which sequentially comprises the following components from an object side to an image side along an optical axis: a diaphragm; the first lens with positive focal power has a convex object-side surface and a concave image-side surface; the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens having optical power; the image side surface of the fourth lens is a convex surface; and a fifth lens with a focal power, an image side surface of which is convex; at least one surface of at least one of the first lens to the fifth lens has a non-rotationally symmetric aspherical surface; wherein, the conditional expression that half Semi-FOV of the maximum field angle of the camera lens group and the effective focal length f of the camera lens group meet is as follows: 0.50mm<tan²(Semi‑FOV)×f<3.00 mm. The photographing lens group provided by the invention applies the free curved surface to the design and production of the photographing lens, can effectively correct off-axis meridional aberration and sagittal aberration, has the advantages of high pixel and miniaturization, and can better correct off-axis meridional aberration and sagittal aberrationAnd the use requirements of various special scenes are met.

Description

Camera lens group

Technical Field

The invention belongs to the field of optical imaging, and particularly relates to a camera lens group which comprises five lenses and is designed by a free curved surface.

Background

With the development of miniaturized imaging lenses and the popularization of large-sized and high-pixel chips in recent years, various large-sized terminal manufacturers have made higher demands on the performance of imaging lenses. Because the current various terminal camera lens groups mostly adopt rotationally symmetric (axially symmetric) aspheric surface type structures, and only have sufficient freedom degree in the meridian direction, the lens groups can not effectively correct off-axis meridian aberration and sagittal aberration.

The free-form surface is a non-rotationally symmetrical aspheric surface, so that non-rotationally symmetrical components are increased, the optimized degree of freedom is increased, off-axis meridional aberration and sagittal aberration can be effectively corrected, the performance of the camera lens group is greatly promoted, and the free-form surface is applied to the design and production of the camera lens and has great significance.

Therefore, a high-pixel and small five-lens type camera lens group is needed, which can better meet the use requirements of various special scenes.

Disclosure of Invention

The invention aims to provide a camera lens group consisting of five lenses, which applies a free-form surface to the design and production of the camera lens, can effectively correct off-axis meridional aberration and sagittal aberration, has the advantages of high pixel and miniaturization, and can better meet the use requirements of various special scenes.

One aspect of the present invention provides an image capturing lens assembly, in order from an object side to an image side along an optical axis, comprising: a diaphragm; the first lens with positive focal power has a convex object-side surface and a concave image-side surface; the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens having optical power; the image side surface of the fourth lens is a convex surface; and a fifth lens having optical power; at least one surface of at least one of the first lens to the fifth lens has a non-rotationally symmetric aspherical surface.

Wherein, the conditional expression that half Semi-FOV of the maximum field angle of the camera lens group and the effective focal length f of the camera lens group meet is as follows: 0.50mm<tan²(Semi-FOV)×f<3.00mm。

According to an embodiment of the present invention, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy the following conditional expression: 0.50< f1/f4< 3.50.

According to one embodiment of the present invention, the combined focal length f34 of the third lens and the fourth lens and the distance BFL on the optical axis from the image-side surface of the fifth lens to the imaging surface of the imaging lens group satisfy the conditional expression: 1.00< f34/BFL < 6.00.

According to one embodiment of the invention, the combined focal length f23 of the second lens and the third lens and the curvature radius R10 of the image side surface of the fifth lens satisfy the following conditional expression: 0.50< f23/R10< 4.00.

According to one embodiment of the present invention, the conditional expression that the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy is: 1.00< R3/R4< 4.00.

According to one embodiment of the present invention, the conditional expression that the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R1 of the object-side surface of the first lens satisfy is: 2.00< R3/R1< 7.00.

According to one embodiment of the present invention, the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy the following conditional expression: 1.00< CT4/CT2< 3.00.

According to an embodiment of the present invention, the air interval T34 of the third lens and the fourth lens on the optical axis and the air interval T12 of the first lens and the second lens on the optical axis satisfy the conditional expression: 2.00< T34/T12< 15.00.

According to one embodiment of the present invention, the conditional expression that an on-axis distance SAG11 between an intersection point of the first lens object-side surface and the optical axis and an effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 between an intersection point of the second lens image-side surface and the optical axis and an effective radius vertex of the second lens image-side surface satisfy: 1.00< SAG11/SAG22< 4.00.

According to an embodiment of the present invention, the edge thickness ET3 of the third lens and the edge thickness ET1 of the first lens satisfy the following conditional expression: 0.50< ET3/ET1< 4.00.

According to one embodiment of the present invention, the maximum effective radius DT51 of the object-side surface of the fifth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy the following conditional expression: 1.00< DT51/DT52< 6.00.

In another aspect, the present invention provides an image capturing lens assembly, in order from an object side to an image side along an optical axis, comprising: a diaphragm; the first lens with positive focal power has a convex object-side surface and a concave image-side surface; the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens having optical power; the image side surface of the fourth lens is a convex surface; and a fifth lens with a focal power, an image side surface of which is convex; at least one surface of at least one of the first lens to the fifth lens has a non-rotationally symmetric aspherical surface.

Wherein, each lens is independent, and there is air space on the optical axis between each lens; the combined focal length f34 of the third lens and the fourth lens and the distance BFL on the optical axis from the image side surface of the fifth lens to the imaging surface of the shooting lens group satisfy the following conditional expression: 1.00< f34/BFL < 6.00.

The invention has the beneficial effects that:

the camera lens group provided by the invention comprises a plurality of lenses, such as a first lens, a second lens and a third lens. The free-form surface of the camera lens group is applied to the design and production of the camera lens, the off-axis meridional aberration and sagittal aberration can be effectively corrected, the camera lens group has the advantages of high pixel and miniaturization, and can better meet the use requirements of various special scenes.

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 view of a lens assembly according to an embodiment 1 of the present invention;

FIG. 2 shows the correspondence between the RMS spot diameter and the real light image height of the image capturing lens assembly of embodiment 1 of the present invention;

FIGS. 3a to 3b are an astigmatism curve and a distortion curve of the photographing lens assembly of embodiment 1 of the present invention, respectively;

FIG. 4 is a schematic view of a lens assembly according to embodiment 2 of the present invention;

FIG. 5 shows the correspondence between the RMS spot diameter and the real light image height of the embodiment 2 of the photographing lens assembly of the present invention;

FIGS. 6a to 6b are an astigmatism curve and a distortion curve of the photographing lens assembly of embodiment 2 of the present invention, respectively;

FIG. 7 is a schematic view of a lens assembly according to embodiment 3 of the present invention;

FIG. 8 shows the correspondence between the RMS spot diameter and the real light image height of the image capturing lens assembly of embodiment 3 of the present invention;

FIGS. 9a to 9b are an astigmatism curve and a distortion curve of the photographing lens assembly according to embodiment 3 of the present invention;

FIG. 10 is a schematic view of a lens assembly according to embodiment 4 of the present invention;

FIG. 11 shows the correspondence between the RMS spot diameter and the real light image height of the embodiment 4 of the photographing lens assembly of the present invention;

fig. 12a to 12b are an astigmatism curve and a distortion curve of the photographing lens assembly according to embodiment 4 of the present invention;

FIG. 13 is a schematic view of a lens assembly according to embodiment 5 of the present invention;

FIG. 14 shows the correspondence between the RMS spot diameter and the real light image height of the embodiment 5 of the photographing lens assembly of the present invention;

fig. 15a to 15b are an astigmatism curve and a distortion curve of the photographing lens assembly according to embodiment 5 of the present invention;

FIG. 16 is a schematic view of a lens assembly according to embodiment 6 of the present invention;

FIG. 17 shows the correspondence between the RMS spot diameter and the real light image height of the embodiment 6 of the photographing lens assembly of the present invention;

fig. 18a to 18b are an astigmatism curve and a distortion curve of the photographing lens assembly according to embodiment 6 of the present invention, respectively.

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

In the present exemplary embodiment, the first lens has positive optical power, and the object-side surface thereof is convex and the image-side surface thereof is concave; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens may have a positive optical power or a negative optical power; the fourth lens has positive focal power, and the image side surface of the fourth lens is a convex surface; the fifth lens can have positive focal power or negative focal power, and the image side surface of the fifth lens is a convex surface; at least one surface of at least one of the first lens to the fifth lens has a non-rotationally symmetric aspherical surface.

In the present exemplary embodiment, the condition that half of the Semi-FOV of the maximum angle of view of the image capturing lens group and the effective focal length f of the image capturing lens group satisfy is: 0.50mm<tan²(Semi-FOV)×f<3.00 mm. The ratio of the maximum half field angle of the camera lens group to the effective focal length of the camera lens group is controlled, so that the large field angle imaging effect of the camera lens group can be realized, and compared with a conventional lens with a small field angle, the large field angle camera lens group can emphasize the foreground and highlight the far-near contrast, and the spatial depth sense of a shot picture is increased. More specifically, Semi-FOV and f satisfy: 0.9mm<tan²(Semi-FOV)×f<2.7mm, e.g. 0.94 mm. ltoreq. tan²(Semi-FOV)×f≤2.63mm。

In the present exemplary embodiment, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy the conditional expression: 0.50< f1/f4< 3.50. Through the reasonable control of the effective focal length ratio of the first lens and the fourth lens, the focal power of the camera lens group can be reasonably distributed, so that the positive spherical aberration and the negative spherical aberration of the front group lens and the rear group lens are mutually offset. More specifically, f1 and f4 satisfy: 0.7< f1/f4<3.1, e.g., 0.77. ltoreq. f1/f 4. ltoreq.3.06.

In the present exemplary embodiment, the conditional expression that the combined focal length f34 of the third lens and the fourth lens and the distance BFL on the optical axis from the image-side surface of the fifth lens to the imaging surface of the image pickup lens group satisfy is: 1.00< f34/BFL < 6.00. The ratio of the combined focal length of the third lens and the fourth lens to the distance from the image side surface of the fifth lens to the imaging surface of the shooting lens group on the optical axis is reasonably controlled within a certain range, so that the contribution of the aberration of the three lenses can be controlled, the aberration is balanced with the aberration generated by the front-end optical element, and the aberration of the shooting lens group is in a reasonable horizontal state. More specifically, f34 and BFL satisfy: 1.1< f34/BFL <5.2, e.g., 1.17 ≦ f34/BFL ≦ 5.18.

In the present exemplary embodiment, the combined focal length f23 of the second lens and the third lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy the conditional expression: 0.50< f23/R10< 4.00. By controlling the ratio of the combined focal length of the second lens and the third lens to the curvature radius of the image side surface of the fifth lens, the contribution of high-grade spherical aberration to the camera lens group can be controlled in a certain amount, so that the camera lens group has good imaging quality. More specifically, f23 and R10 satisfy: 0.6< f23/R10<2.8, e.g., 0.69. ltoreq. f 23/R10. ltoreq.2.72.

In the present exemplary embodiment, the conditional expression that the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy is: 1.00< R3/R4< 4.00. The ratio of the curvature radius of the object side surface and the curvature radius of the image side surface of the second lens is reasonably controlled, so that the sensitivity of the second lens can be effectively reduced, and the resolution of the lens is improved. More specifically, R3 and R4 satisfy: 1.6< R3/R4<3.8, e.g., 1.68 ≦ R3/R4 ≦ 3.74.

In the present exemplary embodiment, the conditional expression that the radius of curvature R3 of the second lens object-side surface and the radius of curvature R1 of the first lens object-side surface satisfy is: 2.00< R3/R1< 7.00. The ratio of the curvature radius of the object side surface of the second lens to the curvature radius of the object side surface of the first lens is controlled within a certain range, so that the deflection angle of marginal light rays of the camera lens group can be reasonably controlled, and the sensitivity of the camera lens group is effectively reduced. More specifically, R3 and R1 satisfy: 2.5< R3/R1<7, e.g., 2.53. ltoreq. R3/R1. ltoreq.6.99.

In the present exemplary embodiment, the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy the conditional expression: 1.00< CT4/CT2< 3.00. By controlling the ratio of the central thicknesses of the fourth lens and the second lens on the optical axis, the distortion contribution of each view field of the camera lens group can be controlled within a reasonable range, and the imaging quality is improved. More specifically, CT4 and CT2 satisfy: 1.8< CT4/CT2<2.8, e.g., 1.89. ltoreq. CT4/CT 2. ltoreq.2.70.

In the present exemplary embodiment, the air interval T34 of the third lens and the fourth lens on the optical axis and the air interval T12 of the first lens and the second lens on the optical axis satisfy the conditional expression: 2.00< T34/T12< 15.00. By restricting the ratio of the air space of the first lens and the second lens on the optical axis to the air space of the third lens and the fourth lens on the optical axis, the field curvature contribution of each field of view can be controlled within a reasonable range. More specifically, T34 and T12 satisfy: 2.4< T34/T12<14.7, e.g., 2.41 ≦ T34/T12 ≦ 14.60.

In the present exemplary embodiment, the conditional expression that an on-axis distance SAG11 between an intersection point of the first lens object-side surface and the optical axis to an effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 between an intersection point of the second lens image-side surface and the optical axis to an effective radius vertex of the second lens image-side surface satisfies: 1.00< SAG11/SAG22< 4.00. By reasonably controlling the ratio, the inclination angles of the object side surface and the image side surface of the first lens and the second lens can be effectively controlled, the ghost risk between the first lens and the second lens is reduced, and the difficulty in subsequent links such as process machining, forming and the like is avoided. More specifically, SAG11 and SAG22 satisfy: 1.6< SAG11/SAG22<3.2, e.g., 1.69 ≦ SAG11/SAG22 ≦ 3.12.

In the present exemplary embodiment, the edge thickness ET3 of the third lens and the edge thickness ET1 of the first lens satisfy the conditional expression: 0.50< ET3/ET1< 4.00. By reasonably controlling the ratio of the edge thickness of the third lens to the edge thickness of the first lens, the curvature of field contribution of the image side surface of the third lens can be in a reasonable range, and the curvature of field generated by the rear lens is balanced. More specifically, ET3 and ET1 satisfy: 0.9< ET3/ET1<3.9, e.g., 0.94 ≦ ET3/ET1 ≦ 3.83.

In the present exemplary embodiment, the maximum effective radius DT51 of the object-side surface of the fifth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy the conditional expression: 1.00< DT51/DT52< 6.00. By reasonably controlling the ratio of the maximum effective radius of the two side surfaces of the object image of the fifth lens, on one hand, the size of the shooting lens group can be controlled, so that the whole shooting lens group is thinner; on the other hand, the range of incident light rays is reasonably limited, light rays with poor edge quality are removed, off-axis aberration is reduced, and the resolution of the camera lens group is effectively improved. More specifically, DT51 and DT52 satisfy: 1.1< DT51/DT52<3.5, e.g., 1.13 ≦ DT51/DT52 ≦ 3.21.

In the present exemplary embodiment, the above-described photographing lens group may further include a diaphragm. The stop may be disposed at an appropriate position as needed, for example, the stop may be disposed between the object side and the first lens. Optionally, the above-mentioned image pickup lens group may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the image plane.

The image capturing lens assembly according to the above embodiment of the present invention can employ a plurality of lenses, for example, the above five lenses. The focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like are reasonably distributed, so that the camera lens group has a larger imaging image surface, has the characteristics of wide imaging range and high imaging quality, and ensures the ultrathin property of the mobile phone.

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 fifth 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, and the fifth lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens and the fifth 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 the imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the image pickup lens group is not limited to include five lenses, and the image pickup lens group may include other numbers of lenses if necessary.

Specific embodiments of an image pickup lens group suitable for the above-described embodiments are further described below with reference to the drawings.

Detailed description of the preferred embodiment 1

Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present disclosure, the lens assembly in order from an object side to an image side includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has 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. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

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

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Coefficient of dispersion	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.3587
								S1	Aspherical surface	1.3527	0.5877	3.12	1.55	56.1	-0.0725
S2	Aspherical surface	5.5664	0.0549				0.0000
								S3	Aspherical surface	9.4513	0.2521	-6.89	1.67	20.4	62.2610
S4	Aspherical surface	3.0569	0.3526				0.0000
								S5	Aspherical surface	145.8774	0.3581	23.34	1.55	56.1	0.0000
S6	Aspherical surface	-13.9499	0.5380				0.0000
								S7	Aspherical surface	-14.1800	0.4760	4.08	1.55	56.1	0.0000
S8	Aspherical surface	-1.9458	0.4217				-1.0000
								S9	Aspherical surface	13.0259	0.3429	6.17	1.54	55.7	0.0000
S10(AAS)	Aspherical surface	-4.3995	0.3082
								S11	Spherical surface	All-round	0.2100		1.52	64.2
S12	Spherical surface	All-round	0.3060
								S13	Spherical surface	All-round	0.1417

TABLE 1

As shown in table 2, in embodiment 1, the total effective focal length f of the image capturing lens group is 2.59mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 is 4.35mm, the half ImgH of the diagonal line length of the effective pixel area on the imaging surface S13 is 2.61mm, and the half semifov of the maximum field angle of the image capturing lens group is 45.19 °.

TABLE 2

The imaging lens group in embodiment 1 satisfies:

tan²(Semi-FOV) × f 2.63mm, where Semi-FOV is half of the maximum field angle of the image capturing lens group, and f is the effective focal length of the image capturing lens group;

f1/f4 is 0.77, wherein f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens;

f34/BFL is 3.72, wherein f34 is the combined focal length of the third lens and the fourth lens, and BFL is the distance on the optical axis from the image side surface of the fifth lens to the imaging surface of the shooting lens group;

f23/R10 is 2.29, wherein f23 is the combined focal length of the second lens and the third lens, and R10 is the curvature radius of the image side surface of the fifth lens;

R3/R4 is 3.09, where R3 is the radius of curvature of the object-side surface of the second lens and R4 is the radius of curvature of the image-side surface of the second lens;

R3/R1 is 6.99, where R3 is the radius of curvature of the object-side surface of the second lens and R1 is the radius of curvature of the object-side surface of the first lens;

CT4/CT2 is 1.89, where CT4 is the central thickness of the fourth lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis;

T34/T12 is 9.80, where T34 is an air space on the optical axis of the third lens and the fourth lens, and T12 is an air space on the optical axis of the first lens and the second lens;

SAG11/SAG22 is 3.02, wherein SAG11 is an on-axis distance 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 SAG22 is an on-axis distance between an intersection point of the image side surface of the second lens and the optical axis and an effective radius vertex of the image side surface of the second lens;

ET3/ET1 is 1.24, where ET3 is the edge thickness of the third lens and ET1 is the edge thickness of the first lens;

DT51/DT52 is 3.21, where DT51 is the maximum effective radius of the object-side surface of the fifth lens and DT52 is the maximum effective radius of the image-side surface of the fifth lens.

In embodiment 1, the object-side surfaces S1 of the first lens E1 to S9 of the fifth lens E5 are all 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 embodiment 1, the fifth lens image-side surface S10 is a non-rotationally symmetric aspheric surface, and the non-rotationally symmetric aspheric depth z can be defined by, but is not limited to, the following non-rotationally symmetric aspheric formula:

where z is the aspheric depth, c is the curvature at the center of the optical surface, r is the linear distance between the point on the free-form surface and the origin of the optical axis, k is the conic coefficient, θ is the angle between r and the optical axis, and σ (r) is the cosine of the angle between the z-axis and the normal to the conic surface.

In example 1, the object-side surfaces S1 to S9 of the first lens E1 and the fifth lens E5 are aspheric, and table 3 shows the high-order coefficient a of the aspheric surfaces S1 to S9 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄And A₂₆。

Flour mark

A4

A6

A8

A10

A12

A14

S1

1.1224E-02

1.1705E-03

-7.2193E-05

-5.4134E-05

-3.8757E-05

-9.4255E-06

S2

-2.1473E-02

4.1896E-03

-7.4842E-04

-5.8673E-05

-2.0753E-05

-1.2310E-05

S3

-1.6152E-02

7.2897E-03

-1.1819E-03

8.8339E-06

-3.4984E-05

-1.9864E-05

S4

3.1028E-02

7.9188E-03

4.9648E-04

3.1808E-04

6.1887E-05

1.1886E-05

S5

-1.2472E-01

-8.7767E-03

-6.8346E-04

2.8037E-04

1.9273E-04

5.4539E-05

S6

-2.2585E-01

-8.6496E-03

3.8557E-03

2.5304E-03

9.0071E-04

2.9246E-04

S7

-3.6207E-01

-2.9662E-02

1.9774E-02

2.0827E-03

-2.9850E-03

-3.7710E-04

S8

3.1910E-01

-1.4314E-02

-2.0604E-02

5.5204E-04

-8.9088E-04

-9.2358E-05

S9

-1.1665E+00

5.5629E-01

-2.5590E-01

1.0686E-01

-4.3281E-02

1.0859E-02

Flour mark

A16

A18

A20

A22

A24

A26

S1

-5.9348E-06

-2.0532E-06

-1.9146E-06

0.0000E+00

S2

-3.0987E-06

-8.9041E-07

1.6584E-06

0.0000E+00

S3

9.5552E-07

-5.0488E-07

1.2698E-06

0.0000E+00

S4

2.2656E-06

2.0201E-06

6.8210E-07

0.0000E+00

S5

1.1224E-05

-1.0877E-06

2.6819E-06

1.7885E-06

1.6538E-08

0.0000E+00

S6

-9.1804E-06

-2.5984E-05

-3.8425E-05

-1.2350E-10

3.6601E-10

0.0000E+00

S7

7.8756E-04

2.5405E-04

-1.2851E-04

-1.2742E-04

-2.8712E-06

0.0000E+00

S8

-9.6979E-05

1.4109E-04

3.6266E-05

-4.2049E-05

0.0000E+00

S9

-2.6969E-03

2.4028E-03

-1.9540E-03

1.0407E-03

-1.6212E-04

-4.6884E-06

TABLE 3

In example 1, the fifth lens image-side surface S10 is an aspherical surface that is not rotationally symmetric, and table 4 shows free-form surface data of the fifth lens image-side surface S10 in example 1.

TABLE 4

Fig. 2 shows the correspondence of the RMS spot diameter of the imaging lens group of embodiment 1 to the real ray image height. Fig. 3a shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 1. Fig. 3b shows a distortion curve of the image capturing lens group of embodiment 1, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 2, 3a and 3b, the image capturing lens assembly of embodiment 1 can achieve good image quality.

Specific example 2

Fig. 4 is a lens assembly according to embodiment 2 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a 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 positive power, and has a convex object-side surface S9 and a convex image-side surface S10. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

As shown in table 5, the basic parameter table of the imaging lens group of embodiment 2 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

TABLE 5

As shown in table 6, in embodiment 2, the total effective focal length f of the image capturing lens group is 2.59mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 is 4.35mm, the half ImgH of the diagonal line length of the effective pixel area on the imaging surface S13 is 2.61mm, and the half semifov of the maximum field angle of the image capturing lens group is 31.12 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 6

In example 2, the object-side surfaces S1 to S9 of the first lens E1 and the fifth lens E5 are aspheric, and table 7 shows the high-order coefficient a of the aspheric surfaces S1 to S9 used in example 2₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄And A₂₆。

TABLE 7

In example 2, the fifth lens image-side surface S10 is an aspherical surface that is not rotationally symmetric, and table 8 shows free-form surface data of the fifth lens image-side surface S10 in example 2.

TABLE 8

Fig. 5 shows the correspondence of the RMS spot diameter of the imaging lens group of embodiment 2 to the real ray image height. Fig. 6a shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 2. Fig. 6b shows a distortion curve of the image capturing lens group of embodiment 2, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 5, 6a and 6b, the image capturing lens assembly according to embodiment 2 can achieve good image quality.

Specific example 3

Fig. 7 is a lens assembly according to embodiment 3 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

As shown in table 9, the basic parameter table of the imaging lens group according to embodiment 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Coefficient of dispersion	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.3201
								S1	Aspherical surface	1.3662	0.5530	2.92	1.55	56.1	-0.0725
S2	Aspherical surface	8.2253	0.0483				0.0000
								S3	Aspherical surface	8.9777	0.2500	-4.99	1.67	20.4	75.8683
S4	Aspherical surface	2.4004	0.3138				-0.6378
								S5	Aspherical surface	16.1391	0.3956	10.84	1.55	56.1	0.0000
S6	Aspherical surface	-9.2592	0.7052				0.0000
								S7	Aspherical surface	-10.6694	0.6000	3.04	1.55	56.1	0.0000
S8	Aspherical surface	-1.4664	0.3657				-1.0000
								S9	Aspherical surface	69.0058	0.1631	7.65	1.54	55.7	0.0000
S10(AAS)	Aspherical surface	-4.3641	0.2992
								S11	Spherical surface	All-round	0.2100		1.52	64.2
S12	Spherical surface	All-round	0.3041
								S13	Spherical surface	All-round	0.1420

TABLE 9

As shown in table 10, in embodiment 3, the total effective focal length f of the image capturing lens group is 2.47mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 is 4.35mm, the half ImgH of the diagonal line length of the effective pixel area on the imaging surface S13 is 2.61mm, and the half semifov of the maximum field angle of the image capturing lens group is 32.44 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

Watch 10

In example 3, the object-side surfaces S1 to S9 of the first lens E1 and the fifth lens E5 are aspheric, and table 11 shows the high-order coefficient a of the aspheric surfaces S1 to S9 used in example 3₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.5438E-02

2.5709E-03

3.3497E-04

5.7925E-05

-2.3694E-05

-6.0950E-06

-1.0391E-05

S2

-8.6457E-03

4.9521E-03

-2.8473E-03

-3.7614E-04

-2.6548E-04

-2.2765E-05

1.5405E-05

S3

-2.6236E-02

5.9175E-03

-3.4941E-03

-2.5894E-04

-2.8586E-04

-3.5911E-05

3.8200E-06

S4

2.1357E-02

9.1132E-03

1.9133E-04

3.9204E-04

2.1667E-05

1.2528E-05

5.6420E-06

S5

-1.0986E-01

-5.4212E-03

3.4878E-04

7.8280E-04

3.2432E-04

1.0823E-04

1.2557E-05

S6

-2.0390E-01

-4.8376E-03

7.2135E-03

4.2025E-03

1.6099E-03

4.2900E-04

1.3997E-05

S7

-4.2530E-01

-6.2772E-02

1.9119E-02

6.9726E-03

-2.1088E-03

-2.6840E-03

-4.8017E-04

S8

2.6076E-01

-3.7833E-02

2.4108E-02

-3.2070E-02

-2.7439E-03

2.5932E-03

1.3093E-03

S9

-1.1092E+00

5.4455E-01

-2.4421E-01

9.7588E-02

-3.6003E-02

9.5171E-03

-5.0516E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.5854E-06

-5.4820E-06

0.0000E+00

S2

1.4645E-05

6.6370E-06

0.0000E+00

S3

6.7013E-06

4.5696E-06

0.0000E+00

S4

3.5172E-06

3.5746E-06

0.0000E+00

S5

2.8238E-06

-3.4633E-06

9.8954E-07

8.7744E-09

0.0000E+00

S6

-3.7925E-05

-2.3940E-05

2.0404E-10

5.3403E-10

0.0000E+00

S7

3.7963E-04

3.1539E-04

6.4344E-05

-1.2788E-06

0.0000E+00

S8

-1.5907E-03

1.7129E-04

2.2847E-04

1.5050E-04

-1.7182E-04

-5.7257E-06

3.9243E-05

S9

4.0515E-03

-2.5576E-03

8.0212E-04

2.5572E-04

-4.5256E-04

2.7112E-04

-6.0435E-05

TABLE 11

In example 3, the fifth lens image-side surface S10 is an aspherical surface that is not rotationally symmetric, and table 12 shows free-form surface data of the fifth lens image-side surface S10 in example 3.

TABLE 12

Fig. 8 shows the correspondence of the RMS spot diameter of the imaging lens group of embodiment 3 to the real ray image height. Fig. 9a shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 3. Fig. 9b shows a distortion curve of the image capturing lens group of embodiment 3, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 8, 9a and 9b, the imaging lens assembly according to embodiment 3 can achieve good imaging quality.

Specific example 4

Fig. 10 is a lens assembly according to embodiment 4 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

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 convex 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. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

As shown in table 13, the basic parameter table of the imaging lens group according to embodiment 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Coefficient of dispersion	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.3040
								S1	Aspherical surface	1.3705	0.5467	3.22	1.55	56.1	0.5142
S2	Aspherical surface	5.3637	0.0618				-3.0648
								S3	Aspherical surface	3.4635	0.2004	-8.07	1.67	20.4	0.0000
S4	Aspherical surface	2.0579	0.4230				0.0000
								S5	Aspherical surface	2696.6059	0.3338	-12.43	1.55	56.1	0.0000
S6	Aspherical surface	6.7665	0.1491				-87.8819
								S7	Aspherical surface	170.0388	0.4618	3.80	1.55	56.1	99.0000
S8	Aspherical surface	-2.0987	0.7080				-2.3975
								S9	Aspherical surface	3.5163	0.4599	4.41	1.54	55.7	0.0000
S10(AAS)	Aspherical surface	-6.8910	0.3273
								S11	Spherical surface	All-round	0.2100		1.52	64.2
S12	Spherical surface	All-round	0.3271
								S13	Spherical surface	All-round	0.1410

Watch 13

As shown in table 14, in embodiment 4, the total effective focal length f of the image capturing lens group is 2.58mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 is 4.35mm, the half ImgH of the diagonal line length of the effective pixel area on the imaging surface S13 is 2.61mm, and the half semifov of the maximum field angle of the image capturing lens group is 41.28 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 14

In example 4, the object-side surfaces S1 to S9 of the first lens E1 and the fifth lens E5 are aspheric, and table 15 shows the high-order coefficient a of the aspheric surfaces S1 to S9 used in example 4₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.8527E-02

-1.7712E-03

-4.5812E-04

-7.5691E-05

-5.7264E-05

-6.2201E-06

-1.1734E-05

S2

-2.8111E-02

5.6715E-03

-1.9471E-03

4.9278E-05

-1.1695E-04

-2.2736E-05

-5.4082E-06

S3

-4.0899E-02

7.9560E-03

-3.0174E-03

5.5719E-05

-1.3414E-04

-3.9452E-06

2.9168E-05

S4

1.4146E-02

8.6767E-03

-1.9899E-04

1.9807E-04

-2.2853E-05

-2.2944E-05

-3.0163E-06

S5

-1.0547E-01

1.0521E-02

4.5625E-03

1.8839E-03

4.0432E-04

-1.4511E-05

-6.5892E-05

S6

-2.3056E-01

-6.7223E-03

3.3807E-03

2.4189E-03

8.8096E-04

3.3560E-04

1.9740E-04

S7

-1.6626E-01

-9.4241E-03

-2.3212E-03

1.5207E-03

1.0505E-03

6.3598E-04

3.6797E-04

S8

1.2977E-01

2.9519E-02

-2.4643E-02

3.3787E-03

2.1954E-03

-5.8082E-04

-2.6876E-04

S9

-1.9713E+00

7.6579E-01

-3.3718E-01

1.2462E-01

-4.2467E-02

1.0335E-02

-2.2305E-03

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.3530E-06

-5.0765E-06

0.0000E+00

S2

6.5280E-08

3.5345E-06

0.0000E+00

S3

2.5240E-05

2.1214E-05

1.2218E-05

5.4343E-06

2.1990E-06

7.4288E-07

1.7957E-07

S4

-5.1118E-06

-8.6801E-08

0.0000E+00

S5

-4.9033E-05

-2.2668E-05

0.0000E+00

S6

7.2353E-05

2.0987E-05

0.0000E+00

S7

9.7196E-05

-1.2664E-05

0.0000E+00

S8

1.4849E-04

3.6550E-07

0.0000E+00

S9

9.9463E-04

-4.1460E-04

2.8160E-04

3.5994E-06

0.0000E+00

Watch 15

In example 4, the fifth lens image-side surface S10 is an aspherical surface that is not rotationally symmetric, and table 16 shows the free-form surface data of the fifth lens image-side surface S10 in example 4.

TABLE 16

Fig. 11 shows the correspondence of the RMS spot diameter of the imaging lens group of embodiment 4 to the real ray image height. Fig. 12a shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 4. Fig. 12b shows a distortion curve of the image capturing lens group of embodiment 4, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 11, 12a and 12b, the imaging lens assembly according to embodiment 5 can achieve good imaging quality.

Specific example 5

Fig. 13 is a lens assembly according to embodiment 5 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

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 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. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

As shown in table 17, the basic parameter table of the imaging lens group according to embodiment 5 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Coefficient of dispersion	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.3120
								S1	Aspherical surface	1.4293	0.5664	3.04	1.55	56.1	0.5424
S2	Aspherical surface	8.9205	0.0470				-5.3906
								S3	Aspherical surface	6.2916	0.2550	-7.78	1.67	20.4	0.0000
S4	Aspherical surface	2.7955	0.4646				0.0000
								S5	Aspherical surface	14.7563	0.7951	-323.80	1.55	56.1	0.0000
S6	Aspherical surface	13.3602	0.2958				0.0000
								S7	Aspherical surface	12.6497	0.6887	1.20	1.55	56.1	83.2079
S8	Aspherical surface	-0.6776	0.0997				-4.4400
								S9	Aspherical surface	-0.7909	0.3818	-1.87	1.54	55.7	-1.0000
S10(AAS)	Aspherical surface	-4.3729	0.1997
								S11	Spherical surface	All-round	0.2100		1.52	64.2
S12	Spherical surface	All-round	0.3552
								S13	Spherical surface	All-round	0.1410

TABLE 17

As shown in table 18, in embodiment 5, the total effective focal length f of the image capturing lens group is 2.74mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 is 4.50mm, the half ImgH of the diagonal line length of the effective pixel area on the imaging surface S13 is 2.61mm, and the half semifov of the maximum field angle of the image capturing lens group is 38.64 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

Watch 18

In example 5, the object-side surfaces S1 to S9 of the first lens E1 and the fifth lens E5 were all aspherical surfaces, and table 19 shows the high-order coefficient a of the high-order terms that can be used for the aspherical surfaces S1 to S9 in example 5₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈And A₃₀。

Watch 19

In example 5, the fifth lens image-side surface S10 is an aspherical surface that is not rotationally symmetric, and table 20 shows the free-form surface data of the fifth lens image-side surface S10 in example 5.

Watch 20

Fig. 14 shows the correspondence of the RMS spot diameter of the imaging lens group of embodiment 5 to the real ray image height. Fig. 15a shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 5. Fig. 15b shows a distortion curve of the image capturing lens group of embodiment 5, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 14, 15a and 15b, the imaging lens assembly according to embodiment 5 can achieve good imaging quality.

Specific example 6

Fig. 16 is a lens assembly according to embodiment 6, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a 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. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13.

As shown in table 21, the basic parameter table of the imaging lens group according to embodiment 6 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Focal length	Refractive index	Coefficient of dispersion	Coefficient of cone
								OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.2982
								S1	Aspherical surface	1.4200	0.5557	3.06	1.55	56.1	0.5464
S2	Aspherical surface	8.1580	0.0413				-1.6283
								S3	Aspherical surface	6.0021	0.2698	-7.75	1.67	20.4	0.0000
S4	Aspherical surface	2.7262	0.3983				0.0000
								S5	Aspherical surface	13.9564	0.8089	30.17	1.55	56.1	0.0000
S6	Aspherical surface	89.6524	0.4044				0.0000
								S7	Aspherical surface	11.7337	0.6926	1.00	1.55	56.1	77.1390
S8	Aspherical surface	-0.5606	0.0577				-3.7073
								S9	Aspherical surface	-0.5988	0.4042	-1.38	1.54	55.7	-1.0000
S10(AAS)	Aspherical surface	-3.8656	0.1803
								S11	Spherical surface	All-round	0.2100		1.52	64.2
S12	Spherical surface	All-round	0.3357
								S13	Spherical surface	All-round	0.1410

TABLE 21

As shown in table 22, in embodiment 6, the total effective focal length f of the image capturing lens group is 2.78mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 is 4.50mm, the half ImgH of the diagonal line length of the effective pixel area on the imaging surface S13 is 2.61mm, and the half semifov of the maximum field angle of the image capturing lens group is 39.64 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.

TABLE 22

In example 6, the object-side surfaces S1 to S9 of the first lens E1 and the fifth lens E5 were all aspheric, and table 23 shows the high-order coefficient a of the aspheric surfaces S1 to S9 used in example 6₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄And A₂₆。

Flour mark

A4

A6

A8

A10

A12

A14

S1

-1.3017E-02

-1.3120E-03

-3.4821E-04

-1.4020E-04

-7.1454E-05

-2.8204E-05

S2

-2.7355E-02

6.3356E-03

-2.3589E-03

1.0283E-05

-1.1936E-04

-1.1748E-05

S3

-3.9505E-02

7.8641E-03

-2.7521E-03

3.4298E-05

-1.0747E-04

-1.3695E-05

S4

1.2013E-02

8.3682E-03

-4.1281E-05

2.2031E-04

2.0359E-05

9.9369E-06

S5

-8.7995E-02

4.9359E-03

1.6110E-03

5.9909E-04

4.3063E-05

-2.4065E-05

S6

-2.5484E-01

-2.8617E-03

6.1718E-04

1.7013E-03

8.2062E-05

4.2813E-04

S7

-3.0007E-01

-2.4852E-02

-1.4271E-02

-2.1455E-05

-8.6530E-04

-2.5665E-04

S8

-2.5118E-01

-1.9722E-02

-2.5492E-02

-9.9563E-03

1.3192E-03

2.5908E-03

S9

1.9639E+00

-4.7718E-01

1.0769E-01

-9.1753E-02

5.0999E-02

-1.9536E-02

Flour mark

A16

A18

A20

A22

A24

A26

S1

-1.3830E-05

-6.5422E-06

-4.9673E-06

0.0000E+00

S2

-2.2953E-06

1.5342E-06

6.0854E-07

0.0000E+00

S3

2.3838E-06

1.3809E-06

1.5351E-06

0.0000E+00

S4

6.3579E-06

1.7187E-06

5.0441E-08

0.0000E+00

S5

-3.2219E-05

1.7579E-06

-1.6584E-06

0.0000E+00

S6

8.1265E-05

2.9654E-05

-7.1469E-06

0.0000E+00

S7

-2.2371E-04

-2.0814E-05

-3.4923E-05

0.0000E+00

S8

-2.3514E-04

1.8863E-04

3.2331E-04

0.0000E+00

S9

9.2999E-03

-1.2465E-03

3.8871E-03

-3.5772E-04

8.5506E-04

-1.7739E-03

TABLE 23

In example 6, the fifth lens image-side surface S10 is an aspherical surface that is not rotationally symmetric, and table 24 shows free-form surface data of the fifth lens image-side surface S10 in example 6.

Watch 24

Fig. 17 shows the correspondence of the RMS spot diameter of the imaging lens group of embodiment 6 to the real ray image height. Fig. 18a shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 6. Fig. 18b shows a distortion curve of the image capturing lens group of embodiment 6, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 17, 18a and 18b, the imaging lens assembly according to embodiment 6 can achieve good imaging quality.

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

Claims

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

a diaphragm;

the first lens with positive focal power has a convex object-side surface and a concave image-side surface;

the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

a third lens having optical power;

the image side surface of the fourth lens is a convex surface;

a fifth lens with focal power, wherein the image side surface of the fifth lens is convex;

at least one surface of at least one of the first lens to the fifth lens has a non-rotationally symmetric aspherical surface;

wherein, the half Semi-FOV of the maximum field angle of the camera lens group and the effective focal length f of the camera lens group satisfy the conditional expression: 0.50mm<tan²(Semi-FOV)×f<3.00mm。

2. The image capturing lens group of claim 1, wherein: the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy the following conditional expression: 0.50< f1/f4< 3.50.

3. The image capturing lens group of claim 1, wherein: the combined focal length f34 of the third lens element and the fourth lens element and the distance BFL between the image side surface of the fifth lens element and the imaging surface of the image taking lens group on the optical axis satisfy the following conditional expression: 1.00< f34/BFL < 6.00.

4. The image capturing lens group of claim 1, wherein: the combined focal length f23 of the second lens and the third lens and the curvature radius R10 of the image side surface of the fifth lens satisfy the following conditional expression: 0.50< f23/R10< 4.00.

5. The image capturing lens group of claim 1, wherein: the condition that the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens meet is as follows: 1.00< R3/R4< 4.00.

6. The image capturing lens group of claim 1, wherein: the condition that the curvature radius R3 of the second lens object side surface and the curvature radius R1 of the first lens object side surface meet is as follows: 2.00< R3/R1< 7.00.

7. The image capturing lens group of claim 1, wherein: the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy the following conditional expression: 1.00< CT4/CT2< 3.00.

8. The image capturing lens group of claim 1, wherein: the air interval T34 of the third lens and the fourth lens on the optical axis and the air interval T12 of the first lens and the second lens on the optical axis satisfy the following conditional expression:

2.00<T34/T12<15.00。

9. the image capturing lens group of claim 1, wherein: the on-axis distance SAG11 between the intersection point of the first lens object side surface and the optical axis and the effective radius vertex of the first lens object side surface and the on-axis distance SAG22 between the intersection point of the second lens image side surface and the optical axis and the effective radius vertex of the second lens image side surface satisfy the following conditional expression: 1.00< SAG11/SAG22< 4.00.

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

a diaphragm;

a third lens having optical power;

the image side surface of the fourth lens is a convex surface;

the combined focal length f34 of the third lens element and the fourth lens element and the distance BFL between the image-side surface of the fifth lens element and the imaging surface of the image capturing lens assembly on the optical axis satisfy the following conditional expression: 1.00< f34/BFL < 6.00.