CN107065142B - Imaging lens group - Google Patents

Abstract

The invention provides an imaging lens group, which sequentially comprises a first lens group and a second lens group from an object side to an imaging side along an optical axis, wherein the first lens group has positive focal power; the second lens group has negative focal power. The first lens group sequentially comprises a first lens, a second lens and a third lens from an object side to an image side along an optical axis, wherein the first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power; and the third lens has positive power or negative power. The second lens group includes, in order from the object side to the image side along the optical axis, a fourth lens and a fifth lens, wherein the fourth lens has negative power; and the fifth lens has positive or negative power, and the object-side surface thereof is convex at the paraxial region. The effective focal length f of the imaging lens group and the combined focal length f45 of the fourth lens and the fifth lens meet the following conditions: f/f45 is more than or equal to-1.0 and less than or equal to-0.5.

Description

Imaging lens group

Technical Field

The present application relates to an imaging lens assembly, and more particularly, to a compact imaging lens assembly consisting of five lenses.

Background

With the continuous updating and upgrading of consumer electronics, the quality of the imaging lens in the consumer electronics is more and more important. In order to ensure the lightness and thinness of electronic products, the lens needs to be miniaturized continuously, and conditions such as high pixel, high magnification and the like are needed at the same time. With the proposal of the double-shot concept, the telephoto lens and the wide-angle lens are mutually matched, and clear high-quality images can be obtained in both a close shot and a long shot under the state of automatic focusing.

The invention provides an imaging lens group which is applicable to portable electronic products, miniaturized and has good imaging quality.

Disclosure of Invention

The technical solution provided by the present application at least partially solves the technical problems described above.

According to one aspect of the present application, an imaging lens set is provided. The imaging lens group comprises a first lens group and a second lens group from the object side to the imaging side along the optical axis in sequence, wherein the first lens group has positive focal power; the second lens group may have negative power. The first lens group can comprise a first lens, a second lens and a third lens in sequence from the object side to the image side along the optical axis, wherein the first lens can have positive focal power, and the object side surface of the first lens is a convex surface; the second lens may have a negative optical power; and the third lens may have a positive power or a negative power. The second lens group may include, in order from the object side to the image side along the optical axis, a fourth lens and a fifth lens, wherein the fourth lens may have a negative power; and the fifth lens may have a positive or negative power, with its object-side surface convex at the paraxial region. The effective focal length f of the imaging lens group and the combined focal length f45 of the fourth lens and the fifth lens can satisfy that: 1.0. Ltoreq. F/f 45. Ltoreq.0.5, for example 0.78. Ltoreq. F/f 45. Ltoreq.0.58.

According to another aspect of the present application, an imaging lens set is provided. The imaging lens group can comprise a first lens group and a second lens group in sequence from an object side to an imaging side along an optical axis, wherein the first lens group can have positive focal power; the second lens group may have negative power. The first lens group can comprise a first lens, a second lens and a third lens in sequence from the object side to the image side along the optical axis, wherein the first lens can have positive focal power, and the object side surface of the first lens is a convex surface; the second lens may have a negative optical power; and the third lens may have a positive power or a negative power. The second lens group may include, in order from the object side to the image side along the optical axis, a fourth lens and a fifth lens, wherein the fourth lens may have a negative power; and the fifth lens may have a positive or negative power, with its object-side surface convex at the paraxial region. The distance BFL from the image side surface of the fifth lens to the imaging surface on the optical axis and the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis can satisfy the following conditions: 0.15 and sWt BFL/TTL <0.3, for example, 0.19 ≦ BFL/TTL ≦ 0.25.

According to yet another aspect of the present application, an imaging lens set is provided. The imaging lens group can comprise a first lens group and a second lens group in sequence from an object side to an imaging side along an optical axis, wherein the first lens group can have positive focal power; the second lens group may have negative power. The first lens group can comprise a first lens, a second lens and a third lens in sequence from the object side to the image side along the optical axis, wherein the first lens can have positive focal power, and the object side surface of the first lens is a convex surface; the second lens may have a negative optical power; and the third lens may have a positive power or a negative power. The second lens group may include, in order from the object side to the image side along the optical axis, a fourth lens and a fifth lens, wherein the fourth lens may have a negative power; and the fifth lens may have a positive or negative power, with its object-side surface convex at the paraxial region. The effective focal length f of the imaging lens group and the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis can satisfy the following conditions: TTL/f <1.0, e.g., TTL/f ≦ 0.97.

According to the embodiment of the application, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens can satisfy the following conditions: 0.3 sf2/f 4<1.0, for example, 0.36. Ltoreq. F2/f 4. Ltoreq.0.62.

According to the embodiment of the application, 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 can satisfy that: -1.5 sR3/R4 < -0.5, for example, -1.06. Ltoreq. R3/R4. Ltoreq.0.62.

According to the embodiment of the application, the effective focal length f of the imaging lens group and the effective focal length f3 of the third lens can satisfy: i f/f3 i <0.5, e.g., | f/f3| ≦ 0.33.

According to the embodiment of the application, the effective focal length f of the imaging lens group and the effective focal length f5 of the fifth lens can satisfy: if 5< 0.5, for example, | f/f5 ≦ 0.28.

According to the embodiment of the application, the effective focal length f of the imaging lens group and the curvature radius R9 of the object side surface of the fifth lens can satisfy that: f/R9<1.0, e.g., f/R9 ≦ 0.81.

According to the embodiment of the present application, an air interval T23 of the second lens and the third lens on the optical axis and an air interval T34 of the third lens and the fourth lens on the optical axis may satisfy: T23/T34. Ltoreq.0.5, for example, T23/T34. Ltoreq.0.45.

The imaging lens group has at least one of the advantages of miniaturization, small field of view, high magnification, good imaging quality, low sensitivity and balanced aberration by reasonably distributing the focal power, the surface type, the on-axis distance and the like of each lens.

Drawings

The above and other advantages of embodiments of the present application will become apparent from the detailed description with reference to the following drawings, which are intended to illustrate and not to limit exemplary embodiments of the present application. In the drawings:

FIG. 1 shows a schematic block diagram of an imaging lens set of example 1 of the present application;

FIG. 2A shows on-axis aberration curves for the imaging lens set of example 1;

FIG. 2B shows the astigmatism curve of the imaging lens set of example 1;

FIG. 2C shows the distortion curve of the imaging lens set of example 1;

FIG. 2D shows the chromatic aberration of magnification curve of the imaging lens set of example 1;

FIG. 3 is a schematic block diagram of the imaging lens group of embodiment 2 of the present application;

FIG. 4A shows the on-axis aberration curve of the imaging lens set of example 2;

FIG. 4B shows the astigmatism curve of the imaging lens assembly of example 2;

FIG. 4C shows the distortion curve of the imaging lens set of example 2;

FIG. 4D shows the chromatic aberration of magnification curve of the imaging lens set of example 2;

FIG. 5 shows a schematic block diagram of the imaging lens set of embodiment 3 of the present application;

figure 6A shows on-axis aberration curves for the imaging lens set of example 3;

FIG. 6B shows the astigmatic curve of the imaging lens set of example 3;

FIG. 6C shows the distortion curve for the imaging lens set of example 3;

FIG. 6D shows a chromatic aberration of magnification curve for the imaging lens set of example 3;

figure 7 shows a schematic block diagram of an imaging lens set of embodiment 4 of the present application;

figure 8A shows on-axis aberration curves for the imaging lens set of example 4;

FIG. 8B shows the astigmatic curve of the imaging lens set of example 4;

FIG. 8C shows the distortion curve for the imaging lens set of example 4;

FIG. 8D shows a chromatic aberration of magnification curve for the imaging lens set of example 4;

FIG. 9 is a schematic block diagram of an imaging lens set of example 5 of the present application;

FIG. 10A shows the on-axis aberration curves for the imaging lens set of example 5;

FIG. 10B shows the astigmatic curve of the imaging lens set of example 5;

FIG. 10C shows the distortion curve of the imaging lens set of example 5;

figure 10D shows a chromatic aberration of magnification curve for the imaging lens set of example 5.

FIG. 11 is a schematic block diagram of an imaging lens assembly of example 6 of the present application;

FIG. 12A shows the on-axis aberration curve of the imaging lens set of example 6;

FIG. 12B shows the astigmatic curve of the imaging lens set of example 6;

FIG. 12C shows the distortion curve of the imaging lens set of example 6;

figure 12D shows a chromatic aberration of magnification curve for the imaging lens set 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 somewhat exaggerated for convenience of explanation, but it should be understood that the size of the respective components is not limited by the drawings but can be appropriately adjusted within a certain range. 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.

The paraxial region refers to a region near the optical axis. The first lens is the lens closest to the object and the fifth lens is the lens closest to the light sensing element. Herein, a surface closest to the object in each lens is referred to as an object side surface, and a surface closest to the imaging surface in each lens is referred to as an image side surface.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "having," "contains" and/or "containing," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, 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/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 invention 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 application provides an imaging lens group. According to an exemplary embodiment of the present application, the imaging lens group may be sequentially disposed from an object side to an imaging side along an optical axis with a first lens group and a second lens group. In an exemplary embodiment, the first lens group may have positive power, and the second lens group may have negative power.

In an exemplary embodiment, the first lens group may be provided with a first lens, a second lens, and a third lens in order from an object side to an image side along an optical axis. The second lens group may be provided with a fourth lens and a fifth lens in this order from the object side to the image side along the optical axis.

In an exemplary embodiment, the first lens may have a positive optical power, with the object side surface being convex; the second lens may have a negative optical power; the third lens may optionally have a positive or negative optical power; the fourth lens may have a negative optical power; and the fifth lens may optionally have a positive or negative power, with its object-side surface convex at the paraxial region. Through the reasonable positive and negative distribution of the focal power of each lens in the control system, the low-order aberration of the control system can be effectively balanced, so that the system can obtain better imaging quality. By the arrangement, the first lens group and the second lens group form a group of telephoto lenses, so that a small depth of field and high magnification can be obtained, and the imaging lens group has a long-focus characteristic.

In an exemplary embodiment, the effective focal length f of the imaging lens group and the combined focal length f45 of the fourth lens and the fifth lens may satisfy: -1.0. Ltoreq. F/f 45. Ltoreq.0.5, more specifically, can satisfy-0.78. Ltoreq. F/f 45. Ltoreq.0.58. By reasonably configuring the combined focal length of the effective focal length f and the effective focal length f45, the focal power of the first lens group can be effectively reduced, the high-level spherical aberration can be reduced, and the high-level astigmatism can be balanced.

In an exemplary embodiment, an effective focal length f2 of the second lens and an effective focal length f4 of the fourth lens may satisfy: 0.3-sf2/f 4<1.0, more specifically, 0.36. Ltoreq. F2/f 4. Ltoreq.0.62 can be satisfied. By appropriately configuring the focal powers of the second lens and the fourth lens, high coma and high astigmatism can be balanced.

In an exemplary embodiment, a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R4 of the image-side surface of the second lens may satisfy: -1.5 sR3/R4 < -0.5, more specifically, can satisfy-1.06. Ltoreq. R3/R4. Ltoreq.0.62. By the configuration, spherical aberration can be balanced, coma aberration can be reduced, great change of peripheral slope can be avoided, and stray light can be reduced.

In an exemplary embodiment, the effective focal length f of the imaging lens group and the effective focal length f3 of the third lens may satisfy: if f/f 3< 0.5, more specifically, if f/f 3< 0.33, the expression is satisfied. Through the configuration, the light deflection angle can be reduced, the lens aberration can be corrected, the tolerance sensitivity can be reduced, and stray light can be avoided.

In an exemplary embodiment, the effective focal length f of the imaging lens group and the effective focal length f5 of the fifth lens element satisfy: if 5< 0.5, more specifically, | f/f5 ≦ 0.28 may be satisfied. By such a configuration, astigmatism can be balanced, imaging quality can be improved, and CRA matching can be improved.

In an exemplary embodiment, the effective focal length f of the imaging lens group and the radius of curvature R9 of the object-side surface of the fifth lens element satisfy: f/R9<1.0, more specifically, f/R9 ≦ 0.81 may be satisfied. : by such a configuration, high-level coma aberration and high-level astigmatism can be improved, and the imaging quality can be improved.

In an exemplary embodiment, an air interval T23 of the second lens and the third lens on the optical axis and an air interval T34 of the third lens and the fourth lens on the optical axis may satisfy: T23/T34. Ltoreq.0.5, and more specifically, T23/T34. Ltoreq.0.45 can be satisfied. By such a configuration, the light deflection angle can be reduced, the high-order aberration can be reduced, the on-axis image quality can be improved, and the sensitivity can be reduced.

In an exemplary embodiment, a distance BFL between the image-side surface of the fifth lens element and the image plane on the optical axis and a distance TTL between the object-side surface of the first lens element and the image plane on the optical axis may satisfy: 0.15 yarn-woven fabric BFL/TTL is less than 0.3, more specifically, 0.19 is less than or equal to BFL/TTL is less than or equal to 0.25. By such a configuration, the miniaturization of the lens can be maintained, the mutual influence of the lens, the motor and the chip can be reduced, the appearance of the lens can be kept clean, and the optical effective surface can be reduced.

In an exemplary embodiment, the effective focal length f of the imaging lens group and the distance TTL on the optical axis from the object-side surface of the first lens element to the image plane can satisfy: TTL/f <1.0, and more specifically, TTL/f ≦ 0.97 may be satisfied. By such a configuration, a small field of view and high magnification can be realized while maintaining the miniaturization of the telephoto lens.

In an exemplary embodiment, the imaging lens set system may further be provided with an aperture STO for limiting a light beam to adjust the light incoming amount. It should be understood by those skilled in the art that the stop STO can be disposed at any lens position as needed, i.e., the disposition of the stop STO should not be limited to the position shown in the drawings.

The optical imaging lens assembly according to the above embodiments of the present application may employ a plurality of lenses, such as the five lenses described above. Through the reasonable distribution of focal power, surface type, center thickness of each lens and on-axis distance between each lens, the aperture of the optical imaging lens group system can be effectively enlarged, the system sensitivity is reduced, the ultra-thinness and miniaturization of the lens are ensured, and the imaging quality is improved, so that the optical imaging lens group system is more favorable for production and processing and is applicable to portable electronic products. In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, has advantages of improving distortion aberration and astigmatism aberration, and can make a field of view larger and truer. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. In addition, the use of the aspherical lens can also effectively reduce the number of lenses in the optical system.

However, it will be appreciated by those skilled in the art that the number of constituent lenses can be varied to achieve various results and advantages as described below without departing from the claimed subject matter. For example, although the description in the first embodiment has been made taking the example of five lenses, the imaging lens group is not limited to including five lenses. The imaging lens group may also include other numbers of lenses, if desired.

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

Example 1

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

As shown in fig. 1, the imaging lens assembly of embodiment 1 comprises two imaging lens assemblies in sequence from an object side to an imaging side along an optical axis, wherein the first lens assembly comprises a first lens element E1, a second lens element E2 and a third lens element E3 in sequence from the object side to the imaging side along the optical axis; the second lens group comprises a fourth lens element E4 and a fifth lens element E5 which are arranged along the optical axis in order from the object side to the image side. The first lens group may have positive power, and the second lens group may have negative power.

The first lens E1 is provided with an object side surface S1 and an image side surface S2; the second lens E2 has an object side surface S3 and an image side surface S4; the third lens E3 has an object side surface S5 and an image side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; and the fifth lens E5 has an object-side surface S9 and an image-side surface S10. In this embodiment, the first lens may have a positive optical power, with the object side surface being convex; the second lens may have a negative optical power; the third lens may optionally have a positive or negative optical power; the fourth lens may have a negative optical power; and the fifth lens may optionally have a positive or negative power, with its object-side surface convex at the paraxial region. The imaging lens group may also be provided with a diaphragm (not shown) and a filter E6 for filtering infrared light, having an object side S11 and an image side S12. In the imaging lens assembly of the present embodiment, an aperture STO is further disposed to adjust the light-entering amount, so as to improve the imaging quality of the system. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging plane S13.

Table 1 shows the surface type, radius of curvature, thickness, material and conic coefficient of each lens in this example 1.

TABLE 1

Flour mark	Surface type	Radius of curvature	Thickness of	Material	Coefficient of cone
						OBJ	Spherical surface	Go to nothing	All-round
STO	Spherical surface	All-round	-0.4866
						S1	Aspherical surface	1.3871	0.7019	1.55,56.1	-9.1264
S2	Aspherical surface	9.6133	0.2325		-16.8000
						S3	Aspherical surface	-5.3665	0.2330	1.64,23.5	-2.6946
S4	Aspherical surface	6.1189	0.4177		-4.0913
						S5	Aspherical surface	14.8887	0.2592	1.67,20.4	-0.0375
S6	Aspherical surface	230.6790	0.9207		-16.8000
						S7	Aspherical surface	3.5690	0.3310	1.55,56.1	-16.8000
S8	Aspherical surface	1.8660	0.2825		-6.7557
						S9	Aspherical surface	8.5103	0.6096	1.64,23.5	-1.1752
S10	Aspherical surface	12.5793	0.4339		-6.0000
						S11	Spherical surface	All-round	0.3000	1.52,64.2
S12	Spherical surface	All-round	0.5900
						S13	Spherical surface	All-round

Referring to table 1, R3/R4= -0.88 is satisfied between the radius of curvature R3 of the object-side surface S3 of the second lens E2 and the radius of curvature R4 of the image-side surface S4 of the second lens E2; and T23/T34=0.45 is satisfied between an air interval T23 of the second lens E2 and the third lens E3 on the optical axis and an air interval T34 of the third lens E3 and the fourth lens E4 on the optical axis.

In the embodiment, 5 lenses are taken as an example, and the focal length and the surface type of the 5 lenses are reasonably distributed, so that the aperture of the lens is effectively enlarged, the total length of the lens is shortened, and the large aperture and the miniaturization of the lens are ensured; meanwhile, various aberrations are corrected, and the resolution and the imaging quality of the lens are improved. Each aspherical surface type x is defined by the following formula:

wherein x is the distance rise from the vertex of the aspheric surface 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 =1/R (i.e., paraxial curvature c is the reciprocal of the radius of curvature R in table 2 above); k is the conic coefficient (given in table 1 above); ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients A4, A6, A8, a10, a12, a14, and a16 of the respective spherical or aspherical surfaces S1 to S10 that can be used for the respective lenses in this example 1.

TABLE 2

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

4.1590E-01

-6.1728E-01

9.6355E-01

-9.8614E-01

5.8615E-01

-0.145221433

0

S2

-1.2034E-02

2.7259E-02

2.8481E-02

-1.0015E-01

1.2624E-01

-0.068926453

0

S3

8.4089E-03

1.8618E-01

-1.8103E-01

-3.0275E-02

1.4363E-01

-0.094734793

0

S4

2.8567E-02

3.7633E-01

-7.5548E-01

1.5246E+00

-1.7883E+00

0.884106151

0

S5

-1.7781E-01

1.9272E-01

-9.8119E-02

2.3987E-01

-2.8074E-01

0.097636216

0

S6

-1.5903E-01

2.2526E-01

-2.5529E-01

4.1229E-01

-3.1672E-01

0.083066222

0

S7

-2.0534E-01

2.9911E-02

5.4869E-04

8.6485E-03

-4.1934E-03

0.00056183

0

S8

-1.2732E-01

3.4079E-02

-5.8550E-03

-2.9483E-04

4.6048E-04

-0.000113079

9.1232E-06

S9

-6.5236E-02

4.0104E-02

-1.7119E-02

4.0871E-03

-5.3463E-04

3.65912E-05

-1.0572E-06

S10

-6.4868E-02

1.6621E-02

2.4095E-03

-2.8267E-03

7.2712E-04

-8.17E-05

3.5100E-06

Table 3 below shows the effective focal lengths f1 to f5 of the respective lenses, the effective focal length f of the imaging lens group, the distance TTL on the optical axis from the object side surface S1 of the first lens element E1 to the imaging surface S13 of the imaging lens group, and half of the maximum field angle HFOV of the imaging lens group in example 1.

TABLE 3

f1(mm)	2.88	f(mm)	5.49
				f2(mm)	-4.40	TTL(mm)	5.31
f3(mm)	23.87	HFOV(°)	30.5
				f4(mm)	-7.69
f5(mm)	38.55

As can be seen from tables 1 and 3, f/f45= -0.58 is satisfied between the effective focal length f of the imaging lens group and the combined focal length f45 of the fourth lens E4 and the fifth lens E5; f2/f4=0.57 is satisfied between an effective focal length f2 of the second lens E2 and an effective focal length f4 of the fourth lens E4; f/R9=0.65 is satisfied between the effective focal length f of the imaging lens group and the radius of curvature R9 of the object side S9 of the fifth lens E5; the effective focal length f of the imaging lens group and the effective focal length f3 of the third lens E3 meet the condition that | f/f3| =0.23; the effective focal length f of the imaging lens group and the effective focal length f5 of the fifth lens E5 satisfy | f/f5| =0.14; the distance BFL between the image side surface S10 of the fifth lens E5 and the imaging surface S13 on the optical axis and the distance TTL between the object side surface S1 of the first lens E1 and the imaging surface S13 on the optical axis satisfy BFL/TTL =0.25; and the effective focal length f of the imaging lens group and the distance TTL from the object side surface S1 of the first lens element E1 to the imaging surface S13 on the optical axis satisfy TTL/f =0.97.

Fig. 2A shows an on-axis aberration curve of the imaging lens group of example 1, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical system. FIG. 2B shows the astigmatism curves for the imaging lens assembly of example 1 representing meridional and sagittal field curvatures. Fig. 2C shows a distortion curve for the imaging lens set of example 1, which represents the distortion magnitude for different viewing angles. Fig. 2D shows a chromatic aberration of magnification curve of the imaging lens assembly of example 1, which represents the deviation of different image heights of light passing through the imaging lens assembly on the imaging plane. In summary, as can be seen from fig. 2A to 2D, the imaging lens assembly of embodiment 1 can achieve the features of miniaturization, good imaging quality and low sensitivity.

Example 2

Embodiment 2 of the above imaging lens set of the present application is described below with reference to fig. 3 to 4D. The imaging lens groups described in this embodiment 2 and the following embodiments are the same in arrangement structure as the imaging lens group described in embodiment 1 except for parameters of each lens of the imaging lens group, such as a radius of curvature, a thickness, a conic coefficient, an effective focal length, an on-axis pitch, a high-order term coefficient of each mirror surface, and the like of each lens. For the sake of brevity, a description of portions similar to those of embodiment 1 will be omitted.

Fig. 3 is a schematic structural diagram of an imaging lens group according to embodiment 2 of the present application. As shown in fig. 3, the imaging lens assembly of embodiment 2 includes two imaging lens assemblies in order from the object side to the imaging side along the optical axis, wherein the first lens assembly includes a first lens element E1, a second lens element E2 and a third lens element E3 arranged in order from the object side to the imaging side along the optical axis, and the second lens assembly includes a fourth lens element E4 and a fifth lens element E5 arranged in order from the object side to the imaging side along the optical axis. Table 4 below shows the surface type, radius of curvature, thickness, material and conic coefficient of each lens in this example 2. Table 5 shows the high-order coefficient A4, A6, A8, a10, a12, a14, a16, a18, and a20 of each of the spherical or aspherical surfaces S1 to S10 that can be used for each lens in this example 2. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 6 shows the effective focal lengths f1 to f5 of the lenses, the effective focal length f of the imaging lens group, the distance TTL on the optical axis from the object side surface S1 of the first lens element E1 to the image plane S13 of the imaging lens group, and half of the maximum field angle HFOV of the imaging lens group in example 2.

TABLE 4

Flour mark	Surface type	Radius of curvature	Thickness of	Material	Coefficient of cone
						OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.4587
						S1	Aspherical surface	1.3930	0.6708	1.55,56.1	-8.9918
S2	Aspherical surface	9.7726	0.2194		-37.3832
						S3	Aspherical surface	-5.2246	0.2300	1.64,23.5	-4.4405
S4	Aspherical surface	8.4882	0.4425		-17.1255
						S5	Aspherical surface	-16.9108	0.2442	1.67,20.4	99.0000
S6	Aspherical surface	-12.0792	1.0002		52.7580
						S7	Aspherical surface	3.2997	0.3812	1.55,56.1	-12.9952
S8	Aspherical surface	1.8090	0.2706		-4.8637
						S9	Aspherical surface	7.7906	0.6292	1.64,23.5	3.2472
S10	Aspherical surface	9.8750	0.3320		-28.0129
						S11	Spherical surface	All-round	0.3000	1.52,64.2
S12	Spherical surface	Go to nothing	0.5900
						S13	Spherical surface	All-round

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.2050E-01

-7.3219E-01

1.6805E+00

-3.2484E+00

4.7493E+00

-4.7776E+00

3.0649E+00

-1.1108E+00

1.7075E-01

S2

-1.6798E-02

1.0165E-01

-5.5495E-01

2.2228E+00

-5.5595E+00

8.7348E+00

-8.4115E+00

4.5437E+00

-1.0592E+00

S3

1.6283E-02

5.3669E-02

4.7048E-01

-2.4870E+00

6.4952E+00

-1.0364E+01

1.0001E+01

-5.3293E+00

1.1883E+00

S4

4.7864E-02

2.4123E-01

-4.1962E-01

8.7440E-01

-2.8650E-01

-3.4161E+00

8.6059E+00

-8.6053E+00

3.3036E+00

S5

-1.5759E-01

1.1379E-01

-6.3794E-02

7.0193E-01

-2.4291E+00

4.6734E+00

-5.2284E+00

3.1336E+00

-7.7553E-01

S6

-1.4668E-01

3.0739E-01

-9.7818E-01

3.0271E+00

-5.8956E+00

7.3616E+00

-5.7081E+00

2.4895E+00

-4.6630E-01

S7

-1.4538E-01

1.0646E-04

3.2207E-02

-3.9778E-02

3.7602E-02

-2.0688E-02

6.2202E-03

-9.4020E-04

5.42048E-05

S8

-9.3019E-02

1.6767E-02

2.0125E-03

-9.2111E-04

-1.9679E-03

1.6298E-03

-5.3021E-04

8.1029E-05

-4.8272E-06

S9

-6.1503E-02

3.1835E-02

-7.2630E-03

-2.2901E-03

1.8182E-03

-4.5900E-04

5.4936E-05

-2.7631E-06

1.9396E-08

S10

-6.8956E-02

2.6831E-02

-9.8077E-03

4.9309E-03

-2.1351E-03

5.6256E-04

-8.4676E-05

6.8050E-06

-2.2856E-07

TABLE 6

f1(mm)	2.89	f(mm)	5.48
				f2(mm)	-4.99	TTL(mm)	5.31
f3(mm)	62.25	HFOV(°)	30.7
				f4(mm)	-8.06
f5(mm)	51.29

Fig. 4A shows an on-axis aberration curve of the imaging lens group of example 2, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical system. FIG. 4B shows the astigmatism curves of the imaging lens assembly of example 2, which represent meridional field curvature and sagittal field curvature. Fig. 4C shows a distortion curve of the imaging lens assembly of example 2, which represents the distortion magnitude for different viewing angles. Fig. 4D shows a chromatic aberration of magnification curve of the imaging lens assembly of example 2, which represents the deviation of different image heights of light passing through the imaging lens assembly on the image plane. In summary, as can be seen from fig. 4A to 4D, the imaging lens assembly of embodiment 2 can achieve the features of miniaturization, good imaging quality and low sensitivity.

Example 3

Embodiment 3 of the above imaging lens set of the present application is described below with reference to fig. 5 to 6D. FIG. 5 is a schematic structural diagram of an imaging lens assembly according to embodiment 3 of the present application. As shown in fig. 5, the imaging lens assembly of embodiment 3 includes two imaging lens assemblies in order from the object side to the imaging side along the optical axis, wherein the first lens assembly includes a first lens element E1, a second lens element E2 and a third lens element E3 arranged in order from the object side to the imaging side along the optical axis, and the second lens assembly includes a fourth lens element E4 and a fifth lens element E5 arranged in order from the object side to the imaging side along the optical axis.

Table 7 below shows the surface type, radius of curvature, thickness, material and conic coefficient of each lens in this example 3. Table 8 shows the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the respective spherical or aspherical surfaces S1 to S10 that can be used for the respective lenses in this example 3. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 9 shows the effective focal lengths f1 to f5 of the lenses, the effective focal length f of the imaging lens group, the distance TTL on the optical axis from the object side surface S1 of the first lens element E1 to the image plane S13 of the imaging lens group, and half of the maximum field angle HFOV of the imaging lens group in example 3.

TABLE 7

TABLE 8

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.1524E-01

-7.4419E-01

1.7702E+00

-3.5984E+00

5.5755E+00

-6.0101E+00

4.1924E+00

-1.6897E+00

2.9883E-01

S2

-1.2009E-02

7.8011E-02

-3.7994E-01

1.4119E+00

-3.3864E+00

5.1703E+00

-4.8537E+00

2.5573E+00

-5.7914E-01

S3

1.1402E-02

8.0007E-02

2.3759E-01

-1.5432E+00

4.0190E+00

-6.0205E+00

5.2959E+00

-2.5166E+00

4.8710E-01

S4

4.2995E-02

2.4061E-01

-6.5634E-01

2.3092E+00

-5.6113E+00

8.9388E+00

-8.4466E+00

4.2247E+00

-7.8311E-01

S5

-1.5521E-01

1.2099E-01

-2.4229E-01

1.2642E+00

-3.4602E+00

6.0226E+00

-6.3983E+00

3.7362E+00

-9.2208E-01

S6

-1.1632E-01

1.9477E-01

-5.6898E-01

1.8268E+00

-3.5506E+00

4.4791E+00

-3.5315E+00

1.5692E+00

-3.0249E-01

S7

-1.4945E-01

3.1875E-02

-4.9977E-02

6.8214E-02

-5.2352E-02

2.6280E-02

-8.3396E-03

1.4965E-03

-1.1546E-04

S8

-8.3742E-02

1.7280E-02

-1.4135E-02

1.7387E-02

-1.2299E-02

4.9697E-03

-1.1495E-03

1.4217E-04

-7.3182E-06

S9

-6.0152E-02

3.8631E-02

-1.7097E-02

4.8801E-03

-1.0592E-03

1.9681E-04

-2.7825E-05

2.3684E-06

-8.6669E-08

S10

-4.3112E-02

7.3788E-03

-3.2209E-04

5.4347E-04

-3.6486E-04

9.1289E-05

-1.1142E-05

6.7297E-07

-1.6184E-08

TABLE 9

f1(mm)	2.83	f(mm)	5.48
				f2(mm)	-4.25	TTL(mm)	5.31
f3(mm)	22.62	HFOV(°)	30.6
				f4(mm)	-8.62
f5(mm)	-85.37

Fig. 6A shows an on-axis aberration curve of the imaging lens assembly of example 3, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the optical system. FIG. 6B shows the astigmatism curves for the imaging lens assembly of example 3 representing meridional and sagittal field curvatures. Figure 6C shows a distortion curve for the imaging lens set of example 3 showing the amount of distortion at different viewing angles. Fig. 6D shows a chromatic aberration of magnification curve of the imaging lens assembly of example 3, which represents the deviation of different image heights of light passing through the imaging lens assembly on the imaging plane. In summary, as can be seen from fig. 6A to 6D, the imaging lens assembly of embodiment 3 can achieve the features of miniaturization, good imaging quality and low sensitivity.

Example 4

Embodiment 4 of the above imaging lens set of the present application is described below with reference to fig. 7 to 8D. Fig. 7 is a schematic structural diagram of an imaging lens group according to embodiment 4 of the present application. As shown in fig. 7, the imaging lens assembly of embodiment 4 includes two imaging lens assemblies in order from an object side to an imaging side along an optical axis, wherein the first lens assembly includes a first lens element E1, a second lens element E2 and a third lens element E3 in order from the object side to the imaging side along the optical axis, and the second lens assembly includes a fourth lens element E4 and a fifth lens element E5 in order from the object side to the imaging side along the optical axis.

Table 10 below shows the surface type, radius of curvature, thickness, material and conic coefficient of each lens in this example 4. Table 11 shows the high-order coefficient A4, A6, A8, a10, a12, a14, a16, a18, and a20 of each of the spherical or aspherical surfaces S1 to S10 that can be used for each lens in this example 4. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 12 shows the effective focal lengths f1 to f5 of the respective lenses, the effective focal length f of the imaging lens group, the distance TTL on the optical axis from the object side surface S1 of the first lens element E1 to the imaging surface S13 of the imaging lens group, and half of the maximum field angle HFOV of the imaging lens group in example 4.

Watch 10

TABLE 11

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

4.1168E-01

-7.3665E-01

1.7487E+00

-3.5538E+00

5.5163E+00

-5.9680E+00

4.1859E+00

-1.6995E+00

3.0346E-01

S2

-1.0317E-02

7.2165E-02

-3.4916E-01

1.2846E+00

-3.0510E+00

4.6162E+00

-4.2951E+00

2.2432E+00

-5.0330E-01

S3

1.3172E-02

7.2797E-02

2.0940E-01

-1.3656E+00

3.5371E+00

-5.2542E+00

4.5733E+00

-2.1455E+00

4.0801E-01

S4

5.0700E-02

2.0417E-01

-5.4719E-01

1.8994E+00

-4.4621E+00

6.8427E+00

-6.1422E+00

2.8439E+00

-4.4810E-01

S5

-1.4561E-01

1.1719E-01

-2.5713E-01

1.2581E+00

-3.3013E+00

5.5925E+00

-5.8305E+00

3.3563E+00

-8.1976E-01

S6

-1.0628E-01

1.7413E-01

-4.8834E-01

1.5359E+00

-2.8920E+00

3.5600E+00

-2.7560E+00

1.2084E+00

-2.3179E-01

S7

-1.4188E-01

2.5341E-02

-4.6865E-02

6.6386E-02

-5.0989E-02

2.4959E-02

-7.5636E-03

1.2831E-03

-9.3491E-05

S8

-7.9348E-02

1.1092E-02

-1.0635E-02

1.6300E-02

-1.2087E-02

4.9106E-03

-1.1299E-03

1.3884E-04

-7.1158E-06

S9

-6.3294E-02

4.1487E-02

-1.8660E-02

5.4822E-03

-1.2260E-03

2.2756E-04

-3.1242E-05

2.5706E-06

-9.1493E-08

S10

-4.2359E-02

5.2242E-03

1.6123E-03

-7.6425E-04

1.5964E-04

-2.9569E-05

4.7795E-06

-4.4546E-07

1.6349E-08

TABLE 12

f1(mm)	2.84	f(mm)	5.48
				f2(mm)	-4.19	TTL(mm)	5.31
f3(mm)	20.10	HFOV(°)	30.6
				f4(mm)	-9.48
f5(mm)	-39.51

Fig. 8A shows an on-axis aberration curve of the imaging lens group of example 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the optical system. FIG. 8B shows the astigmatism curve representing meridional and sagittal image planes curvature for the imaging lens group of example 4. Figure 8C shows a distortion curve for the imaging lens set of example 4 showing the amount of distortion at different viewing angles. Fig. 8D shows a chromatic aberration of magnification curve of the imaging lens assembly of example 4, which represents the deviation of different image heights of light passing through the imaging lens assembly on the image plane. In summary, referring to fig. 8A to 8D, the imaging lens assembly of embodiment 4 can achieve the features of miniaturization, good imaging quality and low sensitivity.

Example 5

Embodiment 5 of the above imaging lens set of the present application is described below with reference to fig. 9 to 10D. FIG. 9 is a schematic structural diagram of an imaging lens assembly according to embodiment 5 of the present application. As shown in fig. 9, the imaging lens assembly of embodiment 5 includes two imaging lens assemblies in order from the object side to the imaging side along the optical axis, wherein the first lens assembly includes a first lens element E1, a second lens element E2 and a third lens element E3 arranged in order from the object side to the imaging side along the optical axis, and the second lens assembly includes a fourth lens element E4 and a fifth lens element E5 arranged in order from the object side to the imaging side along the optical axis.

Table 13 below shows the surface type, radius of curvature, thickness, material and conic coefficient of each lens in this example 5. Table 14 shows the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the respective spherical or aspherical surfaces S1 to S10 that can be used for the respective lenses in this example 5. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 15 shows the effective focal lengths f1 to f5 of the respective lenses, the effective focal length f of the imaging lens group, the distance TTL on the optical axis from the object side surface S1 of the first lens element E1 to the imaging surface S13 of the imaging lens group, and half of the maximum field angle HFOV of the imaging lens group in example 5.

Watch 13

Flour mark	Surface type	Radius of curvature	Thickness of	Material	Coefficient of cone
						OBJ	Spherical surface	All-round	Go to nothing
STO	Spherical surface	All-round	-0.4350
						S1	Aspherical surface	1.4468	0.6411	1.55,56.1	-9.5666
S2	Aspherical surface	16.9573	0.2419		54.5977
						S3	Aspherical surface	-5.2708	0.2300	1.64,23.5	-0.4469
S4	Aspherical surface	5.4463	0.3684		-75.4275
						S5	Aspherical surface	27.5825	0.2454	1.67,20.4	99.0000
S6	Aspherical surface	-20.9651	1.1456		-99.0000
						S7	Aspherical surface	2.6105	0.3058	1.55,56.1	-4.3761
S8	Aspherical surface	1.7377	0.5092		-3.3809
						S9	Aspherical surface	9.3133	0.6346	1.64,23.5	-0.2454
S10	Aspherical surface	5.5519	0.0980		-89.0653
						S11	Spherical surface	Go to nothing	0.3000	1.52,64.2
S12	Spherical surface	All-round	0.5900
						S13	Spherical surface	Go to nothing

TABLE 14

Watch 15

f1(mm)	2.86	f(mm)	5.48
				f2(mm)	-4.13	TTL(mm)	5.31
f3(mm)	17.93	HFOV(°)	30.6
				f4(mm)	-10.86
f5(mm)	-22.87

Fig. 10A shows the on-axis aberration curves for the imaging lens set of example 5, which shows the deviation of the convergent focus of different wavelengths of light rays through the optical system. FIG. 10B shows the astigmatism curve representing meridional and sagittal image planes curvature of the imaging lens group of example 5. Fig. 10C shows a distortion curve of the imaging lens assembly of example 5, which represents the distortion magnitude for different viewing angles. Fig. 10D shows a chromatic aberration of magnification curve of the imaging lens assembly of example 5, which shows the deviation of different image heights of light passing through the imaging lens assembly on the imaging plane. In summary, as can be seen from fig. 10A to 10D, the imaging lens assembly of embodiment 5 can achieve the features of miniaturization, good imaging quality and low sensitivity.

Example 6

Embodiment 6 of the above imaging lens set of the present application is described below with reference to fig. 11 to 12D. Fig. 11 is a schematic structural diagram of an imaging lens group according to embodiment 6 of the present application. As shown in fig. 11, the imaging lens assembly of embodiment 6 includes two imaging lens assemblies in order from the object side to the imaging side along the optical axis, wherein the first lens assembly includes a first lens element E1, a second lens element E2 and a third lens element E3 arranged in order from the object side to the imaging side along the optical axis, and the second lens assembly includes a fourth lens element E4 and a fifth lens element E5 arranged in order from the object side to the imaging side along the optical axis.

Table 16 below shows the surface type, radius of curvature, thickness, material and conic coefficient of each lens in this example 6. Table 17 shows the high-order coefficient A4, A6, A8, a10, a12, a14, a16, a18, and a20 of each of the spherical or aspherical surfaces S1 to S10 that can be used for each lens in this example 6. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 18 shows the effective focal lengths f1 to f5 of the lenses, the effective focal length f of the imaging lens group, the distance TTL on the optical axis from the object side surface S1 of the first lens element E1 to the image plane S13 of the imaging lens group, and half of the maximum field angle HFOV of the imaging lens group in example 6.

TABLE 16

Flour mark	Surface type	Radius of curvature	Thickness of	Material	Coefficient of cone
						OBJ	Spherical surface	All-round	All-round
STO	Spherical surface	All-round	-0.4258
						S1	Aspherical surface	1.4683	0.6348	1.55,56.1	-9.7869
S2	Aspherical surface	21.1825	0.2354		99.0000
						S3	Aspherical surface	-5.4451	0.2300	1.64,23.5	0.7125
S4	Aspherical surface	5.1596	0.3624		-82.9669
						S5	Aspherical surface	14.2688	0.2437	1.67,20.4	99.0000
S6	Aspherical surface	-50.0483	1.1862		-99.0000
						S7	Aspherical surface	2.6197	0.3041	1.55,56.1	-4.5386
S8	Aspherical surface	1.7671	0.5157		-3.0995
						S9	Aspherical surface	10.3430	0.6125	1.64,23.5	-2.5613
S10	Aspherical surface	5.5520	0.0952		-88.8291
						S11	Spherical surface	All-round	0.3000	1.52,64.2
S12	Spherical surface	Go to nothing	0.5900
						S13	Spherical surface	All-round

TABLE 17

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

3.9105E-01

-6.8508E-01

1.5736E+00

-3.0977E+00

4.6725E+00

-4.927431937

3.3763E+00

-1.3410E+00

2.3444E-01

S2

-4.0284E-03

5.9779E-02

-2.6972E-01

9.6042E-01

-2.2396E+00

3.33486289

-3.0553E+00

1.5723E+00

-3.4812E-01

S3

1.0186E-02

1.0152E-01

-3.3517E-02

-4.2581E-01

1.2888E+00

-1.886534514

1.5203E+00

-6.2199E-01

8.9603E-02

S4

6.9879E-02

1.0726E-01

-3.0311E-01

1.1620E+00

-2.8741E+00

4.677031086

-4.5773E+00

2.4657E+00

-5.5150E-01

S5

-1.2953E-01

1.0669E-01

-1.4059E-01

5.7399E-01

-1.2193E+00

1.827854006

-1.8044E+00

1.0175E+00

-2.5035E-01

S6

-7.6873E-02

1.1889E-01

-2.1690E-01

6.3079E-01

-9.9941E-01

1.079442954

-7.8656E-01

3.5570E-01

-7.8761E-02

S7

-1.0012E-01

-4.8010E-02

6.2744E-02

-6.1166E-02

4.9087E-02

-0.027798623

9.7394E-03

-1.8271E-03

1.3894E-04

S8

-6.1333E-02

-3.5985E-02

4.6006E-02

-2.7365E-02

1.0159E-02

-0.002570854

4.2801E-04

-4.0305E-05

1.5230E-06

S9

-7.3110E-02

5.2005E-02

-2.8514E-02

1.2435E-02

-4.1028E-03

0.000912179

-1.2445E-04

9.3579E-06

-2.9779E-07

S10

-4.6777E-02

3.1767E-03

5.1824E-03

-3.9358E-03

1.6109E-03

-0.000387498

5.3577E-05

-3.9188E-06

1.1707E-07

Watch 18

Fig. 12A shows an on-axis aberration curve of the imaging lens assembly of example 6, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical system. FIG. 12B shows the astigmatism curve representing meridional and sagittal image planes curvature of the imaging lens group of example 6. Fig. 12C shows a distortion curve for the imaging lens assembly of example 6, which represents the distortion magnitude for different viewing angles. Fig. 12D shows a chromatic aberration of magnification curve of the imaging lens assembly of example 6, which shows the deviation of different image heights of light passing through the imaging lens assembly on the imaging plane. In summary, as can be seen from fig. 12A to 12D, the imaging lens assembly of embodiment 6 can achieve the features of miniaturization, good imaging quality and low sensitivity.

In summary, referring to tables 1 to 18, the relationship shown in table 19 below can be satisfied between the parameters of examples 1 to 6, respectively.

Watch 19

Formula \ example	1	2	3	4	5	6
							f/f45	-0.58	-0.59	-0.73	-0.74	-0.77	-0.78
f2/f4	0.57	0.62	0.49	0.44	0.38	0.36
							R3/R4	-0.88	-0.62	-0.72	-0.78	-0.97	-1.06
f/R9	0.65	0.70	0.81	0.73	0.59	0.53
							f/f3	0.23	0.09	0.24	0.27	0.31	0.33
f/f5	0.14	0.11	-0.06	-0.14	-0.24	-0.28
							BFL/TTL	0.25	0.23	0.20	0.19	0.19	0.19
T23/T34	0.45	0.44	0.35	0.35	0.32	0.31
							TTL/f	0.97	0.97	0.97	0.97	0.97	0.97

The foregoing description is only exemplary of the preferred embodiments 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 (6)

1. An imaging lens assembly includes, in order from an object side to an image side along an optical axis, a first lens group and a second lens group,

it is characterized in that the preparation method is characterized in that,

the first lens group has positive focal power; and

the second lens group has a negative optical power,

wherein the first lens group includes, in order from an object side to an image side along the optical axis:

a first lens having a positive focal power, an object-side surface of which is convex;

a second lens having a negative focal power; and

a third lens having a positive optical power,

wherein the second lens group includes, in order from an object side to an imaging side along the optical axis:

a fourth lens having a negative focal power; and

a fifth lens element having a positive refractive power or a negative refractive power, the object-side surface of which is convex at the paraxial region,

the effective focal length f of the imaging lens group and the combined focal length f45 of the fourth lens and the fifth lens meet the following conditions: f/f45 is more than or equal to-1.0 and less than or equal to-0.5;

an air interval T23 of the second lens and the third lens on the optical axis and an air interval T34 of the third lens and the fourth lens on the optical axis satisfy: T23/T34 is less than or equal to 0.5;

the distance TTL from the object side surface of the first lens to the imaging surface on the optical axis satisfies the following conditions: TTL/f <1.0;

the curvature radius R9 of the object side surface of the fifth lens meets the following condition: f/R9<1.0; and

the number of lenses having optical power in the imaging lens group is five.

2. The imaging lens assembly of claim 1, wherein an effective focal length f2 of said second lens and an effective focal length f4 of said fourth lens satisfy: 0.3 were woven so as to have f2/f4<1.0.

3. The imaging lens assembly of claim 1 or 2, wherein the radius of curvature R3 of the object-side surface of the second lens element and the radius of curvature R4 of the image-side surface of the second lens element satisfy: -1.5< -R3/R4 < -0.5.

4. The imaging lens group of claim 1, wherein said effective focal length f of said imaging lens group and said effective focal length f3 of said third lens element satisfy: if 3< 0.5.

5. The imaging lens assembly of claim 1, wherein said effective focal length f of said imaging lens assembly and an effective focal length f5 of said fifth lens element satisfy: l f/f5| <0.5.

6. The imaging lens assembly of claim 1 wherein a distance BFL between said fifth lens element image side surface to image plane on said optical axis and a distance TTL between said first lens element object side surface to image plane on said optical axis satisfy: 0.15 and then are constructed with BFL/TTL <0.3.

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