CN210155388U - Optical imaging lens assembly - Google Patents

Abstract

The present application discloses an optical imaging lens assembly, sequentially comprising, from an object side to an image side along an optical axis: a first lens having a positive refractive power, an object-side surface of which is convex; a second lens having an optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having a negative optical power. The total effective focal length f of the optical imaging lens group satisfies f > 23.00 mm.

Description

Optical imaging lens assembly

Technical Field

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

Background

With the continuous development of science and technology, optical imaging lens groups play an increasingly important role in the working life of people. Among them, the long-focus camera module takes an important place in many imaging modules due to its advantage of long-distance camera.

Although the common short-focus camera module can clearly image when the scenery is shot at a short distance, the scenery cannot be clearly imaged on the detector when the scenery is shot at a long distance. However, the method of making a scene sharp by enlarging a shot causes the picture to exhibit much noise and smear. Compare in the short burnt module of making a video recording, long burnt module of making a video recording can realize long-distance clear formation of image with the characteristic of its long burnt to still can keep the picture clear under the circumstances of enlargeing the object one time. Therefore, in order to achieve clearer imaging at the time of telephoto shooting, it is necessary to use an optical imaging lens group having a longer focal length.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging lens group applicable to portable electronic products that can solve at least or partially at least one of the above-mentioned disadvantages of the related art.

An aspect of the present application provides an optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a positive refractive power, an object-side surface of which is convex; a second lens having an optical power; a third lens having a negative optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having a negative optical power.

In one embodiment, the total effective focal length f of the optical imaging lens group may satisfy f > 23.00 mm.

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 group on the optical axis and the total effective focal length f of the optical imaging lens group satisfy TTL/f < 1.00.

In one embodiment, the total effective focal length f of the optical imaging lens group and the effective focal length f3 of the third lens element satisfy-3.00 < f/f3 < -1.00.

In one embodiment, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens can satisfy 1.00 < f1/R1 < 2.50.

In one embodiment, a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens may satisfy 0.50 < R7/R8 < 2.00.

In one embodiment, a central thickness CT1 of the first lens on the optical axis and a separation distance T12 of the first lens and the second lens on the optical axis may satisfy 2.00 < CT1/T12 < 5.00.

In one embodiment, an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, SAG31, and an on-axis distance from an intersection of an image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens, SAG32 may satisfy 2.00 < SAG31/SAG32 < 4.00.

In one embodiment, a sum Σ AT of a distance TD on the optical axis from an object-side surface of the first lens to an image-side surface of the sixth lens and a separation distance on the optical axis from any adjacent two lenses of the first lens to the sixth lens may satisfy Σ AT/TD < 0.57.

In one embodiment, an on-axis distance from an intersection of an object-side surface of the fourth lens and the optical axis to an effective radius vertex of the object-side surface of the fourth lens, SAG41, and an on-axis distance from an intersection of an image-side surface of the fourth lens and the optical axis to an effective radius vertex of the image-side surface of the fourth lens, SAG42 may satisfy 1.00 < SAG41/SAG42 < 3.00.

In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on the optical axis and a central thickness CT1 of the first lens element on the optical axis may satisfy 8.00 < TTL/CT1 < 12.00.

In one embodiment, the distance T45 between the fourth lens and the fifth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis may satisfy 6.00 < T45/CT4 < 12.50.

In one embodiment, the distance TTL from the object side surface of the first lens element to the imaging surface of the optical imaging lens group on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group satisfy TTL/ImgH > 4.00.

This application has adopted six aspherical mirror lens, through the focal power of each lens of rational distribution, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical imaging lens group has at least one beneficial effect such as ultra-thin, long focal length, high imaging quality.

Drawings

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

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

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

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

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

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

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

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

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

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

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

Detailed Description

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

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

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

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

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

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

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

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

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

In an exemplary embodiment, the first lens may have a positive optical power, and the object-side surface thereof may be convex; the second lens has positive focal power or negative focal power; the third lens may have a negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive focal power or negative focal power; the sixth lens may have a negative optical power.

In an exemplary embodiment, the object side surface of the second lens may be convex; the object side surface of the third lens can be a concave surface, and the image side surface can be a concave surface; the object side surface of the fifth lens can be a concave surface, and the image side surface can be a convex surface; the object-side surface of the sixth lens element can be convex, and the image-side surface can be concave.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy f > 23.00mm, where f is a total effective focal length of the optical imaging lens group. More specifically, f further satisfies 23.69mm ≦ f ≦ 24.00 mm. The requirement that f is larger than 23.00mm can ensure that the lens still has better resolving power when shooting at a long distance. Meanwhile, the double-shooting lens group is combined with, for example, a wide-angle lens, which is favorable for realizing higher-power zooming.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy TTL/f < 1.00, where TTL is a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens group, and f is a total effective focal length of the optical imaging lens group. More specifically, TTL and f can further satisfy 0.85 ≦ TTL/f ≦ 0.86. When the ratio of the total length of the lens group to the focal length is less than 1, the miniaturization of the optical imaging lens group can be realized while the same telephoto shooting effect is realized.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy-3.00 < f/f3 < -1.00, where f is the total effective focal length of the optical imaging lens group, and f3 is the effective focal length of the third lens. More specifically, f and f3 further satisfy-2.19. ltoreq. f/f 3. ltoreq. 1.30. And the focal power of the third lens is reasonably distributed, so that the aberration of the optical imaging lens group is favorably and better balanced.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy 1.00 < f1/R1 < 2.50, where f1 is an effective focal length of the first lens and R1 is a radius of curvature of an object side surface of the first lens. More specifically, f1 and R1 can further satisfy 1.50. ltoreq. f 1/R1. ltoreq.2.20, for example, 1.81. ltoreq. f 1/R1. ltoreq.2.02. When the ratio of f1 to R1 is controlled within a certain range, the curvature of field and distortion of the optical imaging lens group can be improved, and the processing difficulty of the first lens can be controlled.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy 0.50 < R7/R8 < 2.00, where R7 is a radius of curvature of an object-side surface of the fourth lens and R8 is a radius of curvature of an image-side surface of the fourth lens. More specifically, R7 and R8 may further satisfy 0.70. ltoreq. R7/R8. ltoreq.1.41. By reasonably controlling the R7 and the R8, the fourth lens can be prevented from being too bent, the processing difficulty is reduced, and the optical imaging lens group has better capability of balancing chromatic aberration and distortion. Alternatively, the object-side surface of the fourth lens element can be convex and the image-side surface can be concave.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy 2.00 < CT1/T12 < 5.00, where CT1 is a central thickness of the first lens on the optical axis and T12 is a separation distance of the first lens and the second lens on the optical axis. More specifically, CT1 and T12 further satisfy 2.56 ≦ CT1/T12 ≦ 4.72. The requirements of 2.00 & lt CT1/T12 & lt 5.00 are met, the size of the optical imaging lens group can be effectively reduced, the overlarge volume of the optical imaging lens group is avoided, the assembly difficulty of the lens is reduced, and the higher space utilization rate is realized.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy 2.00 < SAG31/SAG32 < 4.00, where SAG31 is an on-axis distance from an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, and SAG32 is an on-axis distance from an intersection of an image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens. More specifically, SAG31 and SAG32 further can satisfy 2.54 ≦ SAG31/SAG32 ≦ 3.51. The requirement that SAG31/SAG32 is more than 2.00 and less than 4.00 is met, the third lens can be prevented from being bent too much, the processing difficulty is reduced, and meanwhile, the assembly of the optical imaging lens group has higher stability.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy Σ AT/TD < 0.57, where TD is a distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the sixth lens element, and Σ AT is a sum of separation distances on the optical axis of any adjacent two of the first lens element to the sixth lens element. More specifically, Σ AT and TD further can satisfy 0.49 ≦ Σ AT/TD ≦ 0.56. The air gaps among the lenses in the optical imaging lens group are reasonably distributed, the processing and assembling characteristics can be ensured, and the problems of front and rear lens interference and the like caused by the too small gap in the assembling process are avoided. Meanwhile, the optical imaging lens group is beneficial to slowing down light deflection, adjusting the field curvature of the optical imaging lens group, reducing the sensitivity and further obtaining better imaging quality.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy 1.00 < SAG41/SAG42 < 3.00, where SAG41 is an on-axis distance from an intersection of an object-side surface of the fourth lens and the optical axis to an effective radius vertex of the object-side surface of the fourth lens, and SAG42 is an on-axis distance from an intersection of an image-side surface of the fourth lens and the optical axis to an effective radius vertex of the image-side surface of the fourth lens. More specifically, SAG41 and SAG42 further can satisfy 1.15 ≦ SAG41/SAG42 ≦ 2.28. The SAG41/SAG42 of 1.00 is less than 3.00, the fourth lens can be prevented from being bent too much, the processing difficulty is reduced, and the assembly of the optical imaging lens group has higher stability.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy 8.00 < TTL/CT1 < 12.00, where TTL is a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens group, and CT1 is a central thickness of the first lens element on the optical axis. More specifically, TTL and CT1 further satisfy TTL/CT1 ≦ 11.74 of 8.56 ≦. The requirements that TTL/CT1 is more than 8.00 and less than 12.00 are met, the size of the optical imaging lens group can be effectively reduced, and the reasonable control of the central thickness of the first lens is facilitated; meanwhile, the structure of the optical imaging lens group is favorably adjusted, and the difficulty of lens processing and assembling is reduced.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy 6.00 < T45/CT4 < 12.50, where T45 is a distance between the fourth lens and the fifth lens on the optical axis, and CT4 is a central thickness of the fourth lens on the optical axis. More specifically, T45 and CT4 further satisfy 6.31 ≦ T45/CT4 ≦ 12.24. The ratio range of the air interval of the fourth lens and the fifth lens on the optical axis and the central thickness of the fourth lens on the optical axis is reasonably controlled, the size of the optical imaging lens group can be effectively reduced, the overlarge volume of the optical imaging lens group is avoided, the assembling difficulty of the lenses is reduced, and the high space utilization rate is realized.

In an exemplary embodiment, the optical imaging lens group according to the present application may satisfy TTL/ImgH > 4.00, where TTL is a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens group, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens group. More specifically, TTL and ImgH can further satisfy TTL/ImgH > 4.50, e.g., 4.69 ≦ TTL/ImgH ≦ 4.71. The total length and the image height of the lens group are controlled within a certain ratio, the field angle can be controlled within a certain range, the refraction of incident light on the first lens is more moderate, the excessive increase of aberration is prevented, and the image quality is favorably improved.

In an exemplary embodiment, the optical imaging lens group may further include a diaphragm. The stop may be disposed between the object side and the first lens. Optionally, the optical imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.

The application provides a six-piece optical imaging lens group with a long focal length and an aspheric surface. The optical imaging lens group according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the imaging lens group can be effectively reduced, the sensitivity of the imaging lens group is reduced, and the machinability of the imaging lens group is improved, so that the optical imaging lens group is more beneficial to production and processing and is suitable for 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, that is, at least one of the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, and sixth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the optical imaging lens group is not limited to include six lenses. The optical imaging lens group may further include other numbers of lenses if necessary.

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

Example 1

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

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

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

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

TABLE 1

In the present example, the total effective focal length f of the optical imaging lens group is 23.70mm, the total length TTL of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging lens group) is 20.40mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 4.33mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 10.2 °, and the aperture value Fno is 3.07.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S12 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-2.7911E-04

2.2117E-05

-4.3640E-06

-1.0802E-06

4.0687E-07

-5.9832E-08

4.6536E-09

-1.8830E-10

3.1132E-12

S2

-4.5783E-04

5.7659E-04

-2.8414E-04

7.3737E-05

-1.1648E-05

1.1495E-06

-6.8910E-08

2.2834E-09

-3.1903E-11

S3

-3.6227E-04

1.0349E-03

-6.6800E-04

2.2142E-04

-4.3025E-05

5.1121E-06

-3.6552E-07

1.4416E-08

-2.4021E-10

S4

-7.7600E-03

9.9059E-03

-5.7589E-03

2.0132E-03

-4.4373E-04

6.2185E-05

-5.3647E-06

2.5923E-07

-5.3566E-09

S5

-8.3035E-04

1.0269E-02

-6.0620E-03

1.9852E-03

-4.1318E-04

5.5932E-05

-4.7606E-06

2.3081E-07

-4.8509E-09

S6

4.4059E-03

5.2536E-03

-2.2132E-03

3.0341E-04

2.3858E-05

-1.1822E-05

1.3212E-06

-5.2141E-08

5.4860E-11

S7

-6.3840E-03

3.5945E-03

-7.1136E-04

-1.6484E-04

1.1662E-04

-2.5964E-05

3.0022E-06

-1.8390E-07

4.8320E-09

S8

-4.7377E-03

7.0119E-04

1.4749E-04

-2.2397E-04

9.5007E-05

-2.1944E-05

2.9947E-06

-2.2917E-07

7.6689E-09

S9

1.9803E-03

-4.1174E-03

1.7924E-03

-2.5857E-04

-1.5528E-04

8.1901E-05

-1.6276E-05

1.5212E-06

-5.5513E-08

S10

4.9545E-05

-5.9903E-03

5.9633E-03

-2.9602E-03

7.5044E-04

-9.5064E-05

4.2272E-06

2.0408E-07

-1.9098E-08

S11

-3.4418E-02

3.4661E-03

5.0571E-03

-3.7617E-03

1.1967E-03

-2.0159E-04

1.7687E-05

-6.5989E-07

2.6367E-09

S12

-3.3837E-02

8.3547E-03

-1.6034E-03

4.3006E-05

6.4790E-05

-1.6688E-05

1.9069E-06

-1.0577E-07

2.2636E-09

TABLE 2

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

Example 2

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

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

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 24.00mm, the total length TTL of the optical imaging lens group is 20.30mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 4.33mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 10.0 °, and the aperture value Fno is 3.10.

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

TABLE 3

TABLE 4

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

Example 3

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

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

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 23.69mm, the total length TTL of the optical imaging lens group is 20.40mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 4.33mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 10.3 °, and the aperture value Fno is 3.06.

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

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-2.9887E-04

2.2991E-06

5.2423E-06

-1.3533E-06

-9.1673E-08

4.6584E-08

-4.8400E-09

2.0656E-10

-3.1034E-12

S2

-1.9650E-04

-4.7567E-05

1.2320E-04

-5.4121E-05

1.1002E-05

-1.2323E-06

7.8376E-08

-2.6674E-09

3.8091E-11

S3

9.2418E-04

-7.4572E-04

3.4845E-04

-9.3002E-05

1.5008E-05

-1.4610E-06

8.2374E-08

-2.4256E-09

2.8239E-11

S4

-2.8054E-03

2.1765E-03

-6.9034E-04

1.7174E-04

-3.3591E-05

4.6261E-06

-3.9749E-07

1.8736E-08

-3.6657E-10

S5

-4.9133E-04

8.4896E-03

-4.5737E-03

1.3509E-03

-2.4985E-04

2.9689E-05

-2.1960E-06

9.1828E-08

-1.6560E-09

S6

2.9217E-03

1.0070E-02

-6.0110E-03

1.7685E-03

-2.9258E-04

2.6547E-05

-1.0204E-06

-1.1518E-08

1.4413E-09

S7

-7.5947E-03

7.9384E-03

-4.5623E-03

1.5355E-03

-3.1703E-04

4.0909E-05

-3.1945E-06

1.3803E-07

-2.5478E-09

S8

-7.4921E-03

3.7879E-03

-2.0621E-03

7.5267E-04

-1.7691E-04

2.6724E-05

-2.5085E-06

1.3402E-07

-3.1348E-09

S9

-6.1350E-05

-5.4452E-03

5.4316E-03

-3.4906E-03

1.3884E-03

-3.4420E-04

5.1632E-05

-4.2788E-06

1.5004E-07

S10

-3.9937E-02

3.6864E-02

-2.0033E-02

6.6659E-03

-1.3879E-03

1.7589E-04

-1.2450E-05

3.8872E-07

-1.2427E-09

S11

-7.8823E-02

5.7798E-02

-2.9970E-02

9.9306E-03

-2.0908E-03

2.7145E-04

-2.0105E-05

7.0011E-07

-5.4842E-09

S12

-3.6725E-02

1.3129E-02

-4.8617E-03

1.3244E-03

-2.4244E-04

2.8087E-05

-1.8860E-06

6.0785E-08

-4.9540E-10

TABLE 6

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

Example 4

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

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

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 23.70mm, the total length TTL of the optical imaging lens group is 20.40mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 4.33mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 10.2 °, and the aperture value Fno is 3.05.

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

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-2.5504E-04

1.2190E-06

-5.6937E-07

-2.7927E-07

5.4529E-09

4.1813E-09

-4.3265E-10

1.5042E-11

-1.4635E-13

S2

-1.0366E-04

2.9643E-05

2.6110E-05

-1.4579E-05

2.8365E-06

-2.7973E-07

1.4677E-08

-3.8041E-10

3.6724E-12

S3

5.2007E-04

-6.2548E-04

3.1433E-04

-8.0305E-05

1.1425E-05

-8.6253E-07

2.5616E-08

4.0906E-10

-2.9656E-11

S4

-2.2447E-03

3.0874E-03

-1.6594E-03

5.8269E-04

-1.3228E-04

1.9095E-05

-1.6810E-06

8.2004E-08

-1.6941E-09

S5

-1.0408E-05

1.0273E-02

-6.4599E-03

2.2154E-03

-4.7417E-04

6.4700E-05

-5.4530E-06

2.5831E-07

-5.2585E-09

S6

7.3848E-04

1.1660E-02

-6.8356E-03

2.0082E-03

-3.0537E-04

1.5423E-05

2.0175E-06

-3.2422E-07

1.3172E-08

S7

-9.0396E-03

8.1330E-03

-4.0140E-03

1.1185E-03

-1.6063E-04

5.8679E-06

1.5284E-06

-2.1400E-07

8.6172E-09

S8

-7.6648E-03

4.0092E-03

-2.0821E-03

6.6056E-04

-1.2021E-04

1.0343E-05

1.0134E-07

-8.7922E-08

4.8083E-09

S9

1.4675E-03

-3.5778E-03

1.9905E-03

-7.4418E-04

1.0674E-04

1.4268E-05

-7.1167E-06

9.1104E-07

-4.0498E-08

S10

-5.3243E-04

-4.0023E-03

4.9747E-03

-3.0959E-03

9.9757E-04

-1.7786E-04

1.7246E-05

-8.0044E-07

1.1435E-08

S11

-3.3667E-02

4.5985E-03

4.0682E-03

-3.7544E-03

1.3928E-03

-2.7804E-04

3.0791E-05

-1.7485E-06

3.8326E-08

S12

-3.2832E-02

7.9632E-03

-1.5497E-03

2.8475E-05

8.0535E-05

-2.2691E-05

2.9504E-06

-1.9315E-07

5.1386E-09

TABLE 8

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

Example 5

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

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

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens group is 24.00mm, the total length TTL of the optical imaging lens group is 20.30mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens group is 4.33mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 10.0 °, and the aperture value Fno is 3.06.

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

TABLE 9

Watch 10

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

In summary, examples 1 to 5 satisfy the relationships shown in table 11, respectively.

Conditional expression (A) example	1	2	3	4	5
						f(mm)	23.70	24.00	23.69	23.70	24.00
TTL/f	0.86	0.85	0.86	0.86	0.85
						f/f3	-1.89	-2.06	-1.30	-2.06	-2.19
R7/R8	0.70	1.05	1.41	1.01	0.96
						f1/R1	2.00	1.95	2.02	1.98	1.81
CT1/T12	3.91	2.56	4.72	3.89	3.93
						SAG32/SAG31	2.67	2.77	2.54	3.35	3.51
∑AT/TD	0.52	0.55	0.56	0.49	0.51
						SAG41/SAG42	2.28	1.63	1.15	1.83	1.93
TTL/CT1	9.53	10.03	11.74	8.56	8.77
						T45/CT4	6.31	9.39	12.24	6.93	7.78
TTL/ImgH	4.71	4.69	4.71	4.71	4.69

TABLE 11

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

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

Claims (24)

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

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

a second lens having an optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having a negative optical power;

the total effective focal length f of the optical imaging lens group satisfies f > 23.00 mm.

2. The optical imaging lens group of claim 1, wherein the total effective focal length f of the optical imaging lens group and the effective focal length f3 of the third lens satisfy-3.00 < f/f3 < -1.00.

3. The optical imaging lens group of claim 1, wherein the effective focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy 1.00 < f1/R1 < 2.50.

4. The optical imaging lens group of claim 3 wherein a center thickness CT1 of the first lens on the optical axis and a separation distance T12 of the first lens and the second lens on the optical axis satisfy 2.00 < CT1/T12 < 5.00.

5. The optical imaging lens group of claim 1 wherein the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy 0.50 < R7/R8 < 2.00.

6. The optical imaging lens group of claim 1 wherein an on-axis distance from an intersection of the object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens SAG31 and an on-axis distance from an intersection of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens SAG32 satisfy 2.00 < SAG31/SAG32 < 4.00.

7. The optical imaging lens group of claim 1 wherein an on-axis distance from the intersection of the object-side surface of the fourth lens and the optical axis to the apex of the effective radius of the object-side surface of the fourth lens, SAG41, and the intersection of the image-side surface of the fourth lens and the optical axis to the apex of the effective radius of the image-side surface of the fourth lens, SAG42 satisfies 1.00 < SAG41/SAG42 < 3.00.

8. The optical imaging lens group of claim 1, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on the optical axis and a central thickness CT1 of the first lens element on the optical axis satisfy 8.00 < TTL/CT1 < 12.00.

9. The optical imaging lens group of claim 1 wherein the distance T45 separating the fourth lens and the fifth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy 6.00 < T45/CT4 < 12.50.

10. The optical imaging lens group of any one of claims 1 to 9, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on the optical axis and a total effective focal length f of the optical imaging lens group satisfy TTL/f < 1.00.

11. The optical imaging lens group according to any one of claims 1 to 9, wherein a sum Σ AT of a distance TD on the optical axis from an object side surface of the first lens to an image side surface of the sixth lens and a spacing distance on the optical axis from any adjacent two lenses of the first lens to the sixth lens satisfies Σ AT/TD < 0.57.

12. The optical imaging lens group of any one of claims 1 to 9, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens group satisfy TTL/ImgH > 4.00.

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

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

a second lens having an optical power;

a third lens having a negative optical power;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having a negative optical power;

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 half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group meet the condition that TTL/ImgH is more than 4.00.

14. The optical imaging lens group of claim 13 wherein the total effective focal length f of the optical imaging lens group and the effective focal length f3 of the third lens satisfy-3.00 < f/f3 < -1.00.

15. The optical imaging lens group of claim 13 wherein the effective focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy 1.00 < f1/R1 < 2.50.

16. The optical imaging lens group of claim 13 wherein the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy 0.50 < R7/R8 < 2.00.

17. The optical imaging lens group of claim 13 wherein an on-axis distance from the intersection of the object-side surface of the third lens and the optical axis to the apex of the effective radius of the object-side surface of the third lens SAG31 and the intersection of the image-side surface of the third lens and the optical axis to the apex of the effective radius of the image-side surface of the third lens SAG32 satisfy 2.00 < SAG31/SAG32 < 4.00.

18. The optical imaging lens group of claim 13 wherein an on-axis distance from the intersection of the object-side surface of the fourth lens and the optical axis to the apex of the effective radius of the object-side surface of the fourth lens SAG41 and the intersection of the image-side surface of the fourth lens and the optical axis to the apex of the effective radius of the image-side surface of the fourth lens SAG42 satisfy 1.00 < SAG41/SAG42 < 3.00.

19. The optical imaging lens group of claim 13, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on the optical axis and a central thickness CT1 of the first lens element on the optical axis satisfy 8.00 < TTL/CT1 < 12.00.

20. The optical imaging lens group of claim 13 wherein the distance T45 separating the fourth lens and the fifth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy 6.00 < T45/CT4 < 12.50.

21. The optical imaging lens group of claim 13, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens group on the optical axis and a total effective focal length f of the optical imaging lens group satisfy TTL/f < 1.00.

22. The optical imaging lens group of claim 13 wherein a sum Σ AT of a distance TD on the optical axis from an object side surface of the first lens to an image side surface of the sixth lens and a separation distance on the optical axis between any adjacent two lenses of the first lens to the sixth lens satisfies Σ AT/TD < 0.57.

23. The optical imaging lens group of claim 13 wherein a center thickness CT1 of the first lens on the optical axis and a separation distance T12 of the first lens and the second lens on the optical axis satisfy 2.00 < CT1/T12 < 5.00.

24. The optical imaging lens group of claim 21 wherein the total effective focal length f of the optical imaging lens group satisfies f > 23.00 mm.

Images