CN109298514B - Optical imaging lens group - Google Patents

Abstract

The application discloses an optical imaging lens group, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has positive optical power; the second lens has optical power; the third lens has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens is provided with focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has optical power; and the effective focal length f3 of the third lens and the total effective focal length f of the optical imaging lens group meet-4.5 < f3/f less than or equal to-3.0.

Description

Optical imaging lens group

Technical Field

The present application relates to an optical imaging lens group, and more particularly, to an optical imaging lens group including five lenses.

Background

With the rapid development of science and technology, the performances of electric coupling devices (CCDs) and complementary metal oxide semiconductor (complementary metal-oxide semiconductor) image sensors are continuously improved, the sizes are gradually reduced, and the corresponding imaging lenses are required to meet the characteristics of high pixels and compactness.

In the prior art, in order to satisfy the compact characteristics of the optical lens, the number of lenses of the imaging lens needs to be reduced as much as possible, which results in a lack of freedom in designing the optical system, and makes it difficult to satisfy the market demand for high imaging performance. In addition, in the conventional five-piece type optical tele system, the thickness of an optical lens is large, the change trend of the surface type is obvious, the lens forming is not facilitated, and meanwhile, the optical system is easy to be excessively sensitive. In addition, under the same optical length condition, the excessive thickness of the optical lens can lead to shorter optical back focus and difficult processing.

Disclosure of Invention

The present application provides an optical imaging lens group, e.g. a tele lens, which at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.

In one aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens may have positive optical power; the second lens has positive optical power or negative optical power; the third lens element may have negative refractive power, wherein the object-side surface thereof may be concave and the image-side surface thereof may be convex; the fourth lens element with positive or negative focal power has a convex object-side surface and a concave image-side surface; the fifth lens has positive optical power or negative optical power. The effective focal length f3 of the third lens and the total effective focal length f of the optical imaging lens group can meet the condition that f3/f is less than or equal to-4.5 and less than or equal to-3.0.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R7 of the object-side surface of the fourth lens may satisfy 0.5 < R1/R7 < 2.0.

In one embodiment, the radius of curvature R6 of the image side of the third lens and the radius of curvature R5 of the object side of the third lens may satisfy 1.0 < R6/R5 < 1.6.

In one embodiment, the maximum effective radius DT21 of the object-side surface of the second lens and the maximum effective radius DT31 of the object-side surface of the third lens may satisfy 0.ltoreq.DT 21/DT31 < 1.5.

In one embodiment, the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the optical imaging lens group can satisfy 1.0.ltoreq.f12/f < 2.0.

In one embodiment, the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis and the total effective focal length f of the optical imaging lens group can satisfy TTL/f less than or equal to 1.0.

In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens assembly on the optical axis and the shortest distance FFL between the image side surface of the fifth lens element and the imaging surface of the optical imaging lens assembly can satisfy (TTL-FFL)/TTL being less than or equal to 0.5.

In one embodiment, the optical imaging lens group further includes a diaphragm, and the distance SL between the diaphragm and the imaging surface of the optical imaging lens group on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis may satisfy 0.5 < SL/TTL < 1.0.

In one embodiment, the optical imaging lens group further includes a diaphragm, and the distance SD between the diaphragm and the image side of the fifth lens element and the distance TD between the object side of the first lens element and the image side of the fifth lens element may satisfy 0.5 < SD/TD < 1.0.

In one embodiment, the sum Σct of the center thickness CT3 of the third lens element on the optical axis, the center thickness CT4 of the fourth lens element on the optical axis, and the center thicknesses of the first lens element to the fifth lens element on the optical axis, respectively, may satisfy 0 < (CT 3+ CT 4)/Σctless than or equal to 0.5.

In one embodiment, the sum ΣAT of the spacing distance T34 between the third lens and the fourth lens on the optical axis and the spacing distance between any two adjacent lenses of the first lens to the fifth lens on the optical axis can satisfy 0.ltoreq.T34/ΣAT < 0.5.

In another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens may have positive optical power; the second lens has positive optical power or negative optical power; the third lens element may have negative refractive power, wherein the object-side surface thereof may be concave and the image-side surface thereof may be convex; the fourth lens element with positive or negative focal power has a convex object-side surface and a concave image-side surface; the fifth lens has positive optical power or negative optical power. The distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis and the total effective focal length f of the optical imaging lens group can meet the condition that TTL/f is less than or equal to 1.0.

In still another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens may have positive optical power; the second lens has positive optical power or negative optical power; the third lens element may have negative refractive power, wherein the object-side surface thereof may be concave and the image-side surface thereof may be convex; the fourth lens element with positive or negative focal power has a convex object-side surface and a concave image-side surface; the fifth lens has positive optical power or negative optical power. The maximum effective radius DT21 of the object side surface of the second lens and the maximum effective radius DT31 of the object side surface of the third lens can satisfy 0.ltoreq.DT 21/DT31 < 1.5.

In still another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens may have positive optical power; the second lens has positive optical power or negative optical power; the third lens element may have negative refractive power, wherein the object-side surface thereof may be concave and the image-side surface thereof may be convex; the fourth lens element with positive or negative focal power has a convex object-side surface and a concave image-side surface; the fifth lens has positive optical power or negative optical power. The distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis and the shortest distance FFL between the image side surface of the fifth lens and the imaging surface of the optical imaging lens group can meet the requirement that (TTL-FFL)/TTL is less than or equal to 0.5.

The application adopts five lenses, and the optical imaging lens group has at least one beneficial effect of long focus, high imaging quality, compact structure of the optical lenses, long back focus and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing among each lens and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

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

Fig. 2A to 2D show an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the optical imaging lens group of embodiment 1;

fig. 3 is a schematic diagram showing the structure of an optical imaging lens group according to embodiment 2 of the present application;

Fig. 4A to 4D show an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the optical imaging lens group of embodiment 2;

fig. 5 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 3 of the present application;

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

fig. 7 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 4 of the present application;

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

fig. 9 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 5 of the present application;

fig. 10A to 10D show an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the optical imaging lens group of embodiment 5;

Fig. 11 shows a schematic structural view of an optical imaging lens group according to embodiment 6 of the present application;

Fig. 12A to 12D show an astigmatism curve, a distortion curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging lens group of embodiment 6;

Fig. 13 is a schematic diagram showing the structure of an optical imaging lens group according to embodiment 7 of the present application;

fig. 14A to 14D show an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the optical imaging lens group of embodiment 7;

fig. 15 shows a schematic structural view of an optical imaging lens group according to embodiment 8 of the present application;

Fig. 16A to 16D show an astigmatism curve, a distortion curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging lens group of embodiment 8.

Detailed Description

For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then 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 subject is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

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

The optical imaging lens group according to the exemplary embodiment of the present application may include, for example, five lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.

In an exemplary embodiment, the first lens may have positive optical power; the second lens has positive optical power or negative optical power; the third lens element may have negative refractive power, wherein the object-side surface thereof may be concave and the image-side surface thereof may be convex; the fourth lens element with positive or negative focal power has a convex object-side surface and a concave image-side surface; the fifth lens has positive optical power or negative optical power. The first lens has positive focal power and the second lens has positive or negative focal power, which is beneficial to increasing the angle of view, simultaneously is beneficial to compressing the incident angle of light at the position of the diaphragm, reducing the pupil aberration and improving the imaging quality; the third lens has negative focal power, the object side surface of the third lens is concave, and the image side surface of the third lens is convex, so that the spherical aberration and astigmatism of the system are reduced; the object side surface of the fourth lens is a convex surface and the image side surface is a concave surface, and the fifth lens has positive focal power or negative focal power, so that a compact optical lens structure is realized, and longer back focus is realized. In summary, by performing the above-described power and surface profile distribution on the first to fifth lenses, it is helpful to realize a compact tele lens, and it is possible to make such a lens structure have good imaging quality and good processing characteristics.

In an exemplary embodiment, the object side surface of the first lens may be convex.

In an exemplary embodiment, the image side of the second lens may be concave.

In an exemplary embodiment, the image side surface of the fifth lens may be convex.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression-4.5 < f 3/f.ltoreq.3.0, where f3 is an effective focal length of the third lens and f is a total effective focal length of the optical imaging lens group. More specifically, f3 and f may further satisfy-4.26.ltoreq.f3/f.ltoreq.3.02. By reasonably controlling the focal power of the third lens, not only can the third lens bear the negative focal power required by the optical imaging lens group, but also the spherical aberration contribution quantity of the third lens can be ensured to be in a reasonable and controllable range, the positive spherical aberration contributed by the rear end lens can be reasonably corrected, and further the on-axis view field of the optical imaging lens group is ensured to have better image quality.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.5 < R1/R7 < 2.0, where R1 is a radius of curvature of an object side surface of the first lens element, and R7 is a radius of curvature of an object side surface of the fourth lens element. More specifically, R1 and R7 may further satisfy 0.80.ltoreq.R1/R7.ltoreq.1.66. By restricting the range of the curvature radius of the object side surface of the first lens and the curvature radius of the object side surface of the fourth lens, the coma contribution rate of the first lens and the fourth lens can be controlled within a reasonable range, so that the coma generated by the front end/rear end lens can be effectively balanced, and good imaging quality can be obtained.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 1.0 < R6/R5 < 1.6, where R6 is a radius of curvature of an image side surface of the third lens element, and R5 is a radius of curvature of an object side surface of the third lens element. More specifically, R6 and R5 may further satisfy 1.3 < R6/R5 < 1.6, for example 1.42.ltoreq.R6/R5.ltoreq.1.51. By defining the ratio range of the curvature radius of the object side surface to the curvature radius of the image side surface of the third lens, the thickness ratio trend of the aspheric surface of the third lens can be effectively controlled, and the third lens can have the characteristic of easy processing.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition that 0+.dt21/DT 31 < 1.5, wherein DT21 is the maximum effective radius of the object side surface of the second lens element and DT31 is the maximum effective radius of the object side surface of the third lens element. More specifically, DT21 and DT31 may further satisfy 0.ltoreq.DT 21/DT31 < 1.3, e.g., 0.30.ltoreq.DT 21/DT 31.ltoreq.1.18. By limiting the ratio range of the maximum effective radius of the second lens object side surface to the maximum effective radius of the third lens object side surface, the shapes of the second lens and the third lens can be effectively restrained, and meanwhile, the illuminance characteristic of the optical imaging lens group can be improved.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy a conditional expression (TTL-FFL)/TTL being less than or equal to 0.5, where TTL is a distance between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on an optical axis, and FFL is a shortest distance between an image side surface of the fifth lens element and the imaging surface of the optical imaging lens group. More specifically, TTL and FFL can further satisfy 0.3.ltoreq.TTL-FFL/TTL.ltoreq.0.5, e.g., 0.39.ltoreq.TTL-FFL/TTL.ltoreq.0.46. The condition (TTL-FFL)/TTL is less than or equal to 0.5, the compact optical structure of the optical imaging lens group can be ensured, the processing performance can be met, and meanwhile, the sufficient back focal length can be ensured.

In an exemplary embodiment, the optical imaging lens group may further include a diaphragm to improve imaging quality of the lens. Alternatively, a diaphragm may be provided between the first lens and the second lens.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.5 < SL/TTL < 1.0, where SL is a distance on the optical axis between the stop and the imaging surface of the optical imaging lens group, and TTL is a distance on the optical axis between the object side surface of the first lens and the imaging surface of the optical imaging lens group. More specifically, SL and TTL may further satisfy 0.85. Ltoreq.SL/TTL.ltoreq.0.88. By selecting a proper diaphragm position to meet the condition that the SL/TTL is smaller than 0.5 and smaller than 1.0, the aberration (coma, astigmatism, distortion and axial chromatic aberration) of the optical imaging lens group related to the diaphragm can be effectively corrected.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.5 < SD/TD < 1.0, where SD is the distance on the optical axis between the stop and the image side of the fifth lens element, and TD is the distance on the optical axis between the object side of the first lens element and the image side of the fifth lens element. More specifically, SD and TD may further satisfy 0.62. Ltoreq.SD/TD.ltoreq.0.68. By controlling the center thickness of the first lens on the optical axis and selecting an appropriate stop position, the optical power of the first lens can be effectively ensured to be positive, and the aberration (coma, astigmatism, distortion and axial chromatic aberration) of the optical imaging lens group related to the stop can be effectively corrected.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition 0 < (CT 3+ct 4)/Σctis less than or equal to 0.5, wherein CT3 is the center thickness of the third lens element on the optical axis, CT4 is the center thickness of the fourth lens element on the optical axis, Σct is the sum of the center thicknesses of the first lens element to the fifth lens element on the optical axis, respectively. More specifically, CT3, CT4 and ΣCT may further satisfy 0.31.ltoreq.C3+C4)/(ΣCT.ltoreq.0.50. The shape of the third lens and the fourth lens can be effectively restrained by controlling the ratio range of the sum of CT3 and CT4 to sigma CT, and the residual distortion range of the third lens and the fourth lens after balance can be reasonably controlled, so that the optical imaging lens group has good distortion performance.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition that 0+.t34/Σat < 0.5, where T34 is a distance between the third lens element and the fourth lens element on the optical axis, Σat is a sum of distances between any adjacent two lens elements of the first lens element to the fifth lens element on the optical axis. More specifically, T34 and ΣAT may further satisfy 0.03.ltoreq.T34/ΣAT.ltoreq.0.43. By restricting the ratio of T34 to sigma AT, petzval field curvature, 5-order spherical aberration and chromatic spherical aberration of the optical imaging lens group can be effectively balanced, so that good imaging quality and lower system sensitivity can be obtained, and meanwhile, good processability of the optical imaging lens group can be ensured.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition that f12/f < 2.0 is less than or equal to 1.0, where f12 is a combined focal length of the first lens and the second lens, and f is a total effective focal length of the optical imaging lens group. More specifically, f12 and f may further satisfy 1.04.ltoreq.f12/f.ltoreq.1.76. By controlling the range of the combined focal length of the first lens and the second lens, the contribution range of the focal power can be reasonably controlled, and the contribution rate to the negative spherical aberration can be reasonably controlled, so that the positive spherical aberration generated by the rear end lens can be effectively balanced.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy a condition that TTL/f is less than or equal to 1.0, where TTL is a distance between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on an optical axis, and f is a total effective focal length of the optical imaging lens group. More specifically, TTL and f can further satisfy 0.5 < TTL/f.ltoreq.1.0, e.g., 0.94.ltoreq.TTL/f.ltoreq.0.99. By controlling the ratio of TTL to f, the optical imaging lens group can be ensured to have the characteristic of a long-focus lens.

Optionally, the optical imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.

The optical imaging lens group according to the above embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the optical imaging lens group is more beneficial to production and processing and can be suitable for portable electronic products. Meanwhile, the optical imaging lens group with the configuration has the beneficial effects of long focus, high imaging quality, compact structure of the optical lens, long back focus and the like.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are aspherical mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens group can be varied to achieve the various results and advantages described in the specification without departing from the technical solution claimed in the present application. For example, although the description has been made by taking five lenses as an example in the embodiment, the optical imaging lens group is not limited to include five lenses. The optical imaging lens group may further include other numbers of lenses, if desired.

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

Example 1

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

As shown in fig. 1, an optical imaging lens group according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 1 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of embodiment 1, wherein the units of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 1

As can be seen from table 1, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A ₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈ and A ₂₀ that can be used for each of the aspherical mirrors S1-S10 in example 1.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.0068E-02

1.0118E-03

-1.6876E-03

1.3697E-03

-8.4422E-04

4.0175E-04

-1.2952E-04

2.4220E-05

-2.0546E-06

S2

-8.1106E-04

3.7657E-02

-5.4693E-02

4.4963E-02

-2.3585E-02

8.0539E-03

-1.7494E-03

2.1916E-04

-1.2057E-05

S3

-4.4019E-02

1.9427E-01

-3.4926E-01

3.8051E-01

-2.6736E-01

1.2302E-01

-3.6053E-02

6.1320E-03

-4.6150E-04

S4

-6.7114E-02

3.0637E-01

-5.3381E-01

5.1129E-01

-2.4310E-01

1.1088E-02

4.9306E-02

-2.4434E-02

4.0776E-03

S5

6.0071E-02

1.2106E-01

-3.0425E-01

3.0561E-01

-1.4508E-01

1.5171E-02

1.6206E-02

-7.9522E-03

1.3478E-03

S6

-2.6723E-02

1.8039E-01

-4.3472E-01

5.5920E-01

-4.3451E-01

2.2905E-01

-8.9774E-02

2.5083E-02

-3.4697E-03

S7

3.8157E-02

-2.1059E-01

3.7307E-01

-5.9468E-01

7.3244E-01

-5.8252E-01

2.7797E-01

-7.1875E-02

7.6988E-03

S8

-5.4629E-02

-8.4462E-02

2.6582E-01

-4.3068E-01

4.5276E-01

-2.9717E-01

1.1297E-01

-2.1574E-02

1.4826E-03

S9

4.5262E-02

-2.1030E-02

1.7837E-01

-3.9856E-01

4.6002E-01

-3.1049E-01

1.1764E-01

-2.1500E-02

1.2280E-03

S10

6.5900E-02

1.1897E-03

4.5648E-02

-1.4851E-01

1.8630E-01

-1.3467E-01

5.8455E-02

-1.4068E-02

1.4372E-03

TABLE 2

Table 3 shows effective focal lengths f1 to f5, total effective focal length f, total optical length TTL (i.e., distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), half of the diagonal length ImgH of the effective pixel area on the imaging surface S13 of the optical imaging lens group, maximum half field angle Semi-fov, and f-number Fno of each lens of the optical imaging lens group in embodiment 1.

f1(mm)	4.67	f(mm)	10.90
				f2(mm)	-4.56	TTL(mm)	10.22
f3(mm)	-43.24	ImgH(mm)	2.50
				f4(mm)	6.11	Semi-fov(°)	12.5
f5(mm)	-9.32	Fno	3.09

TABLE 3 Table 3

The optical imaging lens group in embodiment 1 satisfies the following relationship:

f3/f= -3.97, wherein f3 is the effective focal length of the third lens E3, and f is the total effective focal length of the optical imaging lens group;

R1/r7=0.99, wherein R1 is a radius of curvature of the object side surface S1 of the first lens element E1, and R7 is a radius of curvature of the object side surface S7 of the fourth lens element E4;

r6/r5=1.44, where R6 is a radius of curvature of the image side surface S6 of the third lens element E3, and R5 is a radius of curvature of the object side surface S5 of the third lens element E3;

DT21/DT31 = 1.14, wherein DT21 is the maximum effective radius of the object-side surface S3 of the second lens element E2 and DT31 is the maximum effective radius of the object-side surface S5 of the third lens element E3;

(TTL-FFL)/ttl=0.46, wherein TTL is a distance between the object side surface S1 of the first lens element E1 and the imaging surface S13 of the optical imaging lens group on the optical axis, FFL is a shortest distance between the image side surface S10 of the fifth lens element E5 and the imaging surface S13 of the optical imaging lens group;

SL/ttl=0.85, where SL is a distance between the stop and the imaging surface S13 of the optical imaging lens group on the optical axis, and TTL is a distance between the object side surface S1 of the first lens E1 and the imaging surface S13 of the optical imaging lens group on the optical axis;

SD/td=0.64, where SD is the distance between the stop and the image side surface S10 of the fifth lens element E5 on the optical axis, and TD is the distance between the object side surface S1 of the first lens element E1 and the image side surface S10 of the fifth lens element E5 on the optical axis;

(CT 3+ct 4)/Σct=0.39, wherein CT3 is the center thickness of the third lens element E3 on the optical axis, CT4 is the center thickness of the fourth lens element E4 on the optical axis, Σct is the sum of the center thicknesses of the first lens element E1 to the fifth lens element E5, respectively, on the optical axis;

T34/Σat=0.03, where T34 is the distance between the third lens element E3 and the fourth lens element E4 on the optical axis, Σat is the sum of the distances between any two adjacent lens elements of the first lens element E1 to the fifth lens element E5 on the optical axis;

f12/f=1.57, where f12 is the combined focal length of the first lens E1 and the second lens E2, and f is the total effective focal length of the optical imaging lens group;

TTL/f=0.94, where TTL is a distance between the object side surface S1 of the first lens element E1 and the imaging surface S13 of the optical imaging lens group on the optical axis, and f is a total effective focal length of the optical imaging lens group.

Fig. 2A shows an astigmatism curve of the optical imaging lens group of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2B shows a distortion curve of the optical imaging lens group of embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Fig. 2C shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 2D shows the relative illuminance curves of the optical imaging lens group of embodiment 1, which represent the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 2A to 2D, the optical imaging lens group of embodiment 1 can achieve good imaging quality.

Example 2

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

As shown in fig. 3, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 4 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 2, in which the units of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 4 Table 4

As can be seen from table 4, in embodiment 2, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspherical surfaces. Table 5 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 5

Table 6 shows effective focal lengths f1 to f5, a total effective focal length f, an optical total length TTL, a half of the diagonal length ImgH of an effective pixel region on an imaging surface S13 of the optical imaging lens group, a maximum half field angle Semi-fov, and an f-number Fno of each lens of the optical imaging lens group in embodiment 2.

f1(mm)	4.44	f(mm)	10.32
				f2(mm)	-4.24	TTL(mm)	9.76
f3(mm)	-43.00	ImgH(mm)	2.50
				f4(mm)	5.88	Semi-fov(°)	13.2
f5(mm)	-9.61	Fno	3.09

TABLE 6

Fig. 4A shows an astigmatism curve of the optical imaging lens group of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4B shows a distortion curve of the optical imaging lens group of embodiment 2, which represents the distortion magnitude values corresponding to different image heights. Fig. 4C shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 4D shows the relative illuminance curves of the optical imaging lens group of embodiment 2, which represent the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 4A to 4D, the optical imaging lens group according to embodiment 2 can achieve good imaging quality.

Example 3

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

As shown in fig. 5, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 7 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 3, in which the units of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 7

As can be seen from table 7, in embodiment 3, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspherical surfaces. Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 8

Table 9 shows effective focal lengths f1 to f5, a total effective focal length f, an optical total length TTL, a half of the diagonal length ImgH of an effective pixel region on an imaging surface S13 of the optical imaging lens group, a maximum half field angle Semi-fov, and an f-number Fno of each lens of the optical imaging lens group in embodiment 3.

f1(mm)	4.77	f(mm)	10.91
				f2(mm)	-4.68	TTL(mm)	10.23
f3(mm)	-41.13	ImgH(mm)	2.47
				f4(mm)	6.03	Semi-fov(°)	13.4
f5(mm)	-9.36	Fno	3.09

TABLE 9

Fig. 6A shows an astigmatism curve of the optical imaging lens group of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6B shows a distortion curve of the optical imaging lens group of embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Fig. 6C shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 6D shows the relative illuminance curves of the optical imaging lens group of embodiment 3, which represent the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 6A to 6D, the optical imaging lens group provided in embodiment 3 can achieve good imaging quality.

Example 4

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

As shown in fig. 7, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 10 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 4, in which the units of the radii of curvature and the thicknesses are millimeters (mm).

Table 10

As can be seen from table 10, in example 4, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspherical surfaces. Table 11 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 11

Table 12 shows effective focal lengths f1 to f5, a total effective focal length f, an optical total length TTL, a half of the diagonal length ImgH of an effective pixel region on an imaging surface S13 of the optical imaging lens group, a maximum half field angle Semi-fov, and an f-number Fno of each lens of the optical imaging lens group in embodiment 4.

f1(mm)	14.07	f(mm)	11.76
				f2(mm)	103.06	TTL(mm)	11.67
f3(mm)	-43.35	ImgH(mm)	2.50
				f4(mm)	29.04	Semi-fov(°)	11.8
f5(mm)	-116.69	Fno	3.09

Table 12

Fig. 8A shows an astigmatism curve of the optical imaging lens group of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8B shows a distortion curve of the optical imaging lens group of embodiment 4, which represents the distortion magnitude values corresponding to different image heights. Fig. 8C shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 8D shows the relative illuminance curves of the optical imaging lens group of embodiment 4, which represent the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 8A to 8D, the optical imaging lens group provided in embodiment 4 can achieve good imaging quality.

Example 5

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

As shown in fig. 9, an optical imaging lens group according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 13 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 5, in which the units of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 13

As can be seen from table 13, in example 5, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspherical surfaces. Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.9849E-02

4.1123E-03

-1.5812E-03

-2.5199E-03

3.2968E-03

-1.7919E-03

5.3153E-04

-8.5196E-05

5.6597E-06

S2

-3.6402E-02

1.2234E-01

-1.3562E-01

8.2146E-02

-2.8437E-02

5.4926E-03

-6.3042E-04

6.7908E-05

-6.5761E-06

S3

-2.0465E-02

6.7171E-02

-4.2109E-02

-1.6157E-02

3.7046E-02

-2.1365E-02

5.8224E-03

-7.3034E-04

2.9297E-05

S4

3.4894E-02

-1.0886E-01

2.2143E-01

-2.1164E-01

8.2638E-02

1.1869E-02

-2.0748E-02

5.7356E-03

-3.6548E-04

S5

1.5559E-01

-3.0797E-01

5.1255E-01

-5.3675E-01

3.5348E-01

-1.5264E-01

4.6798E-02

-1.0658E-02

1.3964E-03

S6

6.3798E-02

-4.6202E-01

1.2799E+00

-1.8591E+00

1.6133E+00

-8.6393E-01

2.7993E-01

-5.0045E-02

3.7818E-03

S7

9.9284E-02

-6.6626E-01

1.6268E+00

-2.2998E+00

1.9878E+00

-1.0654E+00

3.4571E-01

-6.1860E-02

4.6355E-03

S8

-4.4549E-02

4.6873E-02

-2.9909E-01

7.9676E-01

-1.0988E+00

8.5873E-01

-3.8294E-01

9.0666E-02

-8.7938E-03

S9

-2.1434E-01

8.9218E-01

-2.0043E+00

3.2083E+00

-3.4252E+00

2.3275E+00

-9.6188E-01

2.1995E-01

-2.1292E-02

S10

-1.8683E-02

3.0147E-01

-5.8199E-01

7.9060E-01

-7.3417E-01

4.3565E-01

-1.5634E-01

3.0620E-02

-2.4713E-03

TABLE 14

Table 15 shows effective focal lengths f1 to f5, a total effective focal length f, an optical total length TTL, a half of the diagonal length ImgH of an effective pixel region on an imaging surface S13 of the optical imaging lens group, a maximum half field angle Semi-fov, and an f-number Fno of each lens of the optical imaging lens group in embodiment 5.

f1(mm)	6.20	f(mm)	11.04
				f2(mm)	-7.78	TTL(mm)	10.90
f3(mm)	-45.87	ImgH(mm)	2.50
				f4(mm)	28.69	Semi-fov(°)	12.5
f5(mm)	46.05	Fno	3.09

TABLE 15

Fig. 10A shows an astigmatism curve of the optical imaging lens group of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10B shows a distortion curve of the optical imaging lens group of embodiment 5, which represents the distortion magnitude values corresponding to different image heights. Fig. 10C shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 10D shows the relative illuminance curves of the optical imaging lens group of embodiment 5, which represent the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 10A to 10D, the optical imaging lens group provided in embodiment 5 can achieve good imaging quality.

Example 6

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

As shown in fig. 11, an optical imaging lens group according to an exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 16 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 6, in which the units of the radii of curvature and the thicknesses are millimeters (mm).

Table 16

As can be seen from table 16, in example 6, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspherical surfaces. Table 17 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.7790E-02

2.4356E-05

-2.1083E-03

1.5563E-03

-6.9878E-04

1.8604E-04

-2.9438E-05

2.5226E-06

-8.9406E-08

S2

-1.5073E-02

5.8529E-02

-6.0744E-02

3.3235E-02

-1.1291E-02

2.4209E-03

-3.1716E-04

2.3125E-05

-7.1763E-07

S3

-2.7339E-02

1.2409E-01

-1.4231E-01

1.0115E-01

-4.6015E-02

1.3544E-02

-2.5088E-03

2.6592E-04

-1.2268E-05

S4

1.2033E-02

6.1488E-02

-7.7915E-02

5.7058E-02

-2.1559E-02

3.6083E-03

1.2905E-04

-1.2429E-04

1.0995E-05

S5

9.8324E-02

-8.1507E-02

4.8618E-02

-2.4952E-02

1.4780E-02

-7.1900E-03

2.2025E-03

-3.6257E-04

2.4470E-05

S6

7.2506E-02

-3.9718E-02

-2.7088E-02

6.3850E-02

-5.2573E-02

2.6035E-02

-8.1141E-03

1.4714E-03

-1.1739E-04

S7

1.7210E-02

-4.9379E-02

2.8607E-02

-3.1537E-02

3.5352E-02

-2.2048E-02

7.5156E-03

-1.3294E-03

9.5346E-05

S8

-2.4308E-02

-1.2210E-02

-3.6768E-03

1.0317E-03

1.0397E-02

-1.0102E-02

4.1334E-03

-8.0901E-04

6.1977E-05

S9

-9.9676E-02

9.9877E-02

-6.9215E-02

4.3987E-02

-2.2228E-02

8.2157E-03

-2.0256E-03

2.9612E-04

-1.9211E-05

S10

-4.9550E-02

4.9492E-02

-2.6941E-02

1.3222E-02

-5.4096E-03

1.6268E-03

-3.0160E-04

2.5032E-05

8.1909E-08

TABLE 17

Table 18 shows effective focal lengths f1 to f5, a total effective focal length f, an optical total length TTL, a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13 of the optical imaging lens group, a maximum half field angle Semi-fov, and an f-number Fno of each lens of the optical imaging lens group in embodiment 6.

f1(mm)	8.28	f(mm)	13.82
				f2(mm)	-14.34	TTL(mm)	13.68
f3(mm)	-41.76	ImgH(mm)	2.70
				f4(mm)	66.46	Semi-fov(°)	11.0
f5(mm)	46.08	Fno	3.09

TABLE 18

Fig. 12A shows an astigmatism curve of the optical imaging lens group of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12B shows a distortion curve of the optical imaging lens group of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12C shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 12D shows a relative illuminance curve of the optical imaging lens group of embodiment 6, which represents relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 12A to 12D, the optical imaging lens group provided in embodiment 6 can achieve good imaging quality.

Example 7

An optical imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 7 of the present application.

As shown in fig. 13, an optical imaging lens group according to an exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 19 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 7, in which the units of the radii of curvature and the thicknesses are millimeters (mm).

TABLE 19

As can be seen from table 19, in example 7, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspherical surfaces. Table 20 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.7250E-02

9.3625E-03

-2.3229E-02

2.5062E-02

-1.4548E-02

4.4004E-03

-4.6723E-04

-7.1339E-05

1.5666E-05

S2

5.5887E-02

-2.5304E-02

-1.7572E-01

4.6654E-01

-5.3182E-01

3.3227E-01

-1.1839E-01

2.2591E-02

-1.7933E-03

S3

5.4800E-02

-1.4792E-01

1.8427E-01

-4.4060E-02

-1.1173E-01

1.2077E-01

-5.3611E-02

1.1491E-02

-9.7932E-04

S4

3.3120E-02

-1.7473E-01

5.6827E-01

-8.9887E-01

8.4600E-01

-5.2173E-01

2.1198E-01

-5.1639E-02

5.7392E-03

S5

2.4902E-02

1.7128E-01

-2.6476E-01

1.5670E-01

3.9250E-02

-1.4604E-01

1.1147E-01

-3.8410E-02

5.1939E-03

S6

-1.7020E-01

8.0753E-01

-1.7461E+00

2.4173E+00

-2.2773E+00

1.4547E+00

-6.0163E-01

1.4562E-01

-1.5681E-02

S7

-1.1547E-01

5.2030E-01

-1.1374E+00

1.3668E+00

-1.0247E+00

4.9426E-01

-1.4798E-01

2.4873E-02

-1.7985E-03

S8

-3.7292E-01

1.1363E+00

-2.0243E+00

2.1463E+00

-1.3886E+00

5.1563E-01

-8.1463E-02

-5.9243E-03

2.6391E-03

S9

-6.9422E-01

2.3720E+00

-4.1092E+00

4.6720E+00

-3.5967E+00

1.8292E+00

-5.7909E-01

1.0188E-01

-7.5215E-03

S10

-1.1485E-01

7.7982E-01

-1.4320E+00

1.7585E+00

-1.4512E+00

7.4330E-01

-2.1210E-01

2.6642E-02

-4.1452E-04

Table 20

Table 21 shows effective focal lengths f1 to f5, a total effective focal length f, an optical total length TTL, a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13 of the optical imaging lens group, a maximum half field angle Semi-fov, and an f-number Fno of each lens of the optical imaging lens group in embodiment 7.

f1(mm)	5.36	f(mm)	10.14
				f2(mm)	-5.99	TTL(mm)	9.94
f3(mm)	-43.20	ImgH(mm)	2.70
				f4(mm)	-36.74	Semi-fov(°)	14.4
f5(mm)	8.33	Fno	3.09

Table 21

Fig. 14A shows an astigmatism curve of the optical imaging lens group of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14B shows a distortion curve of the optical imaging lens group of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14C shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 14D shows a relative illuminance curve of the optical imaging lens group of embodiment 7, which represents relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 14A to 14D, the optical imaging lens group provided in embodiment 7 can achieve good imaging quality.

Example 8

An optical imaging lens group according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 8 of the present application.

As shown in fig. 15, the optical imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 22 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 8, in which the units of the radii of curvature and the thicknesses are millimeters (mm).

Table 22

As can be seen from table 22, in example 8, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspherical surfaces. Table 23 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 8, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.2949E-02

5.3626E-03

-1.1795E-02

1.2479E-02

-8.3240E-03

3.4428E-03

-8.6359E-04

1.1774E-04

-6.6261E-06

S2

-8.3503E-02

2.4547E-01

-2.7379E-01

1.8197E-01

-7.8784E-02

2.2023E-02

-3.8128E-03

3.7138E-04

-1.5574E-05

S3

-5.5308E-02

2.3207E-01

-3.1363E-01

2.5468E-01

-1.3581E-01

4.8407E-02

-1.1102E-02

1.4764E-03

-8.6319E-05

S4

9.5378E-03

1.0916E-01

-2.8529E-01

3.8112E-01

-3.1648E-01

1.7229E-01

-5.9803E-02

1.2125E-02

-1.0973E-03

S5

8.6440E-02

-8.0258E-02

4.6717E-02

-1.0500E-02

-5.7233E-03

6.5421E-03

-2.6133E-03

5.1454E-04

-3.9872E-05

S6

4.5049E-02

-6.4712E-02

4.6963E-02

-8.7878E-03

-1.3232E-02

1.4112E-02

-6.4246E-03

1.4826E-03

-1.3827E-04

S7

9.2856E-02

-2.3825E-01

2.8003E-01

-2.6248E-01

1.8168E-01

-8.4896E-02

2.5469E-02

-4.4439E-03

3.4209E-04

S8

4.8680E-02

-2.2552E-01

2.9717E-01

-2.9966E-01

2.4003E-01

-1.3860E-01

5.2050E-02

-1.1122E-02

1.0153E-03

S9

-1.3163E-02

-1.1886E-02

1.3078E-01

-1.7653E-01

1.4857E-01

-9.1631E-02

3.7732E-02

-8.7979E-03

8.6154E-04

S10

8.0766E-03

1.3007E-02

6.5278E-02

-8.2199E-02

5.2245E-02

-2.6235E-02

1.0261E-02

-2.4285E-03

2.4335E-04

Table 23

Table 24 shows effective focal lengths f1 to f5, total effective focal length f, total optical length TTL, half of the diagonal length ImgH of the effective pixel region on the imaging surface S13 of the optical imaging lens group, maximum half field angle Semi-fov, and f-number Fno of each lens of the optical imaging lens group in embodiment 8.

f1(mm)	14.24	f(mm)	11.76
				f2(mm)	130.62	TTL(mm)	11.63
f3(mm)	-42.38	ImgH(mm)	2.70
				f4(mm)	58.91	Semi-fov(°)	12.8
f5(mm)	66.56	Fno	3.09

Table 24

Fig. 16A shows an astigmatism curve of the optical imaging lens group of embodiment 8, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16B shows a distortion curve of the optical imaging lens group of embodiment 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16C shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 8, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 16D shows a relative illuminance curve of the optical imaging lens group of embodiment 8, which represents relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 16A to 16D, the optical imaging lens group provided in embodiment 8 can achieve good imaging quality.

In summary, examples 1 to 8 each satisfy the relationship shown in table 25.

Table 25

The application also provides an image pickup device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a cellular phone. The image pickup apparatus is equipped with the above-described optical imaging lens group.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (9)

1. The optical imaging lens assembly sequentially comprises, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens, characterized in that,

The first lens has positive focal power, and the object side surface of the first lens is a convex surface;

The second lens has optical power, and the image side surface of the second lens is a concave surface;

the third lens has negative focal power, the object side surface of the third lens is concave, and the image side surface of the third lens is convex;

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

The fifth lens has optical power, and the image side surface of the fifth lens is a convex surface;

At least one of the second lens, the fourth lens, and the fifth lens has positive optical power, and when the second lens has positive optical power, the fourth lens has positive optical power; and

The effective focal length f3 of the third lens and the total effective focal length f of the optical imaging lens group meet-4.5 < f3/f less than or equal to-3.0;

The maximum effective radius DT21 of the object side surface of the second lens and the maximum effective radius DT31 of the object side surface of the third lens satisfy that DT21/DT31 is less than or equal to 1.11 and less than 1.5;

The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and the total effective focal length f of the optical imaging lens group meet the condition that TTL/f is more than 0.5 and less than or equal to 1.0;

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

2. The optical imaging lens assembly of claim 1, wherein a radius of curvature R1 of an object side of the first lens and a radius of curvature R7 of an object side of the fourth lens satisfy 0.5 < R1/R7 < 2.0.

3. The optical imaging lens group according to claim 1, wherein a radius of curvature R6 of an image side surface of the third lens and a radius of curvature R5 of an object side surface of the third lens satisfy 1.0 < R6/R5 < 1.6.

4. The optical imaging lens group according to claim 1, wherein a combined focal length f12 of the first lens and the second lens and a total effective focal length f of the optical imaging lens group satisfy 1.0.ltoreq.f12/f < 2.0.

5. The optical imaging lens group according to any one of claims 1 to 4, wherein a distance TTL on the optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens group and an on-axis shortest distance FFL from an image side surface of the fifth lens element to the imaging surface of the optical imaging lens group satisfy 0.3+.ltoreq.ttl-FFL)/ttl+.0.5.

6. The optical imaging lens group according to any one of claims 1 to 4, further comprising a diaphragm, a distance SL of the diaphragm to an imaging surface of the optical imaging lens group on the optical axis and a distance TTL of an object side surface of the first lens to an imaging surface of the optical imaging lens group on the optical axis satisfying 0.5 < SL/TTL < 1.0.

7. The optical imaging lens group according to any one of claims 1 to 4, further comprising a stop, a distance SD of the stop to an image side surface of the fifth lens on the optical axis and a distance TD of an object side surface of the first lens to an image side surface of the fifth lens on the optical axis satisfying 0.5 < SD/TD < 1.0.

8. The optical imaging lens group according to any one of claims 1 to 4, wherein a sum Σct of a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, and center thicknesses of the first lens to the fifth lens on the optical axis, respectively, satisfies 0 < (CT 3+ct 4)/Σctbeing 0.5 or less.

9. The optical imaging lens group according to any one of claims 1 to 4, wherein a sum Σat of a separation distance T34 of the third lens and the fourth lens on the optical axis and a separation distance of any adjacent two of the first lens to the fifth lens on the optical axis satisfies 0 Σat < T34/Σat < 0.5.