CN210155391U

CN210155391U - Optical imaging lens assembly

Info

Publication number: CN210155391U
Application number: CN201921170910.9U
Authority: CN
Inventors: 高雪; 闻人建科; 赵烈烽; 戴付建
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-03-17
Anticipated expiration: 2029-07-24

Abstract

The application discloses optical imaging lens group, it includes: and a prism configured such that light incident on the prism in a direction of a Y optical axis is reflected and then emitted from the prism in a direction of an X optical axis, wherein the X optical axis is perpendicular to the Y optical axis. The optical imaging lens assembly further comprises, in order from the prism to the image side along the X-ray axis: a first lens having a positive optical power; a second lens having a negative optical power; a third lens with focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface; a fifth lens having a refractive power, an object-side surface of which is convex; a sixth lens having optical power. The distance TTL from the object side surface of the first lens to the imaging surface on the optical axis and the total effective focal length f of the optical imaging lens group meet the condition that TTL/f is less than 1; and a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy 3.0 < CT1/(CT2+ CT3) < 3.5.

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 and one prism.

Background

In recent years, with the development of scientific technology, the market demand for imaging systems suitable for portable electronic products has been increasing. In order to meet the demands of various shooting scenes, a lens module mounted on a portable terminal such as a mobile phone is also gradually changed from a single-shot lens to a multi-shot lens. A telephoto imaging system is often provided in the multi-lens system. When shooting, the conventional telephoto lens often causes unstable shooting due to the conventional telescopic manipulation mode. In addition, the conventional telephoto lens generally has a long optical length and cannot be adapted to portable electronic products that are increasingly miniaturized.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging lens group, such as a periscopic telephoto lens, applicable to a portable electronic product, which 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 group including: and a prism configured such that light incident on the prism in a direction of a Y optical axis is reflected and then emitted from the prism in a direction of an X optical axis, wherein the X optical axis is perpendicular to the Y optical axis. The optical imaging lens assembly further comprises, in order from the prism to the image side along the X-ray axis: a first lens having a positive optical power; a second lens having a negative optical power; a third lens with focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface; a fifth lens having a refractive power, an object-side surface of which is convex; and a sixth lens having optical power.

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.

In one embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis may satisfy 3.0 < CT1/(CT2+ CT3) < 3.5.

In one embodiment, the effective focal length f1 of the first lens and the central thickness CT1 of the first lens on the optical axis may satisfy 2.4 < f1/CT1 < 3.1.

In one embodiment, the effective focal length f2 of the second lens and the effective focal length f1 of the first lens can satisfy-1.5 < f2/f1 < -1.

In one embodiment, the effective focal length f6 of the sixth lens element and the total effective focal length f of the optical imaging lens group can satisfy-1.0 < f6/f < -0.5.

In one embodiment, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy 1.5 < R4/R5 < 3.0.

In one embodiment, 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 can satisfy 0.5 < R7/R8 ≦ 1.5.

In one embodiment, a radius of curvature R11 of an object-side surface of the sixth lens and a radius of curvature R12 of an image-side surface of the sixth lens may satisfy 1.5 < R11/R12 < 3.0.

In one embodiment, a separation distance T34 on the optical axis of the third lens and the fourth lens, a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, a separation distance T45 on the optical axis of the fourth lens and the fifth lens, and a separation distance T56 on the optical axis of the fifth lens and the sixth lens may satisfy 6.0 < T34/(T12+ T23+ T45+ T56) < 10.1.

The prism capable of turning the optical direction is arranged in front of the first lens to the sixth lens, so that the lens can be arranged in parallel with the body of a portable electronic product, and the problem of thickening of the body caused by optical zooming can be well solved. In addition, the optical imaging lens group has at least one beneficial effect of excellent imaging quality, easy processing and forming, long focus and the like 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.

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;

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

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

Detailed Description

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

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

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

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

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

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

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

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

The optical imaging lens group according to an exemplary embodiment of the present application may include a prism and, for example, six lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The prism may be configured such that light incident on the prism in a direction along the Y optical axis is reflected and exits the prism in a direction along the X optical axis, wherein the X optical axis is perpendicular to the Y optical axis. The first lens element to the sixth lens element may be arranged along an X-ray axis in order from the prism to the image side. Any adjacent two lenses among the first to sixth lenses may have an air space therebetween.

In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a negative optical power; the third lens has positive focal power or negative focal power, the object side surface of the third lens can be a convex surface, and the image side surface of the third lens can be a concave surface; the fourth lens has positive focal power or negative focal power, the object side surface of the fourth lens can be a concave surface, and the image side surface of the fourth lens can be a convex surface; the fifth lens has positive focal power or negative focal power, and the object side surface of the fifth lens can be a convex surface; the sixth lens has positive power or negative power. The low-order aberration of the control system is effectively balanced by reasonably controlling the positive and negative distribution of the focal power of each component of the system and the lens surface curvature.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression TTL/f < 1, 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 further satisfy 0.8 < TTL/f < 0.9. The optical imaging lens group satisfies TTL/f < 1, and the optical imaging lens group can satisfy the long-focus characteristic.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 2.4 < f1/CT1 < 3.1, where f1 is an effective focal length of the first lens and CT1 is a central thickness of the first lens on an optical axis. More specifically, f1 and CT1 can further satisfy 2.46. ltoreq. f1/CT 1. ltoreq.3.09. If the focal power of the first lens is too large, the optical path tends to be large, and a lens shape difficult to process is likely to be formed. The focal power of the first lens is reasonably controlled, so that the focal power borne by the first lens can be prevented from being too large, and the manufacturability of the lens is improved.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression-1.5 < f2/f1 < -1, where f2 is an effective focal length of the second lens and f1 is an effective focal length of the first lens. More specifically, f2 and f1 further satisfy-1.44. ltoreq. f2/f 1. ltoreq. 1.08. Under the condition that the focal power of the first lens is negative, the focal power of the second lens is ensured to be positive, so that the volume of the optical system can be effectively controlled, and the performance is improved. The first lens and the second lens have optical powers with different signs, so that the optical system has better capability of balancing aberration.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression-1.0 < f6/f < -0.5, where f6 is an effective focal length of the sixth lens element, and f is a total effective focal length of the optical imaging lens group. More specifically, f6 and f can further satisfy-0.85. ltoreq. f 6/f. ltoreq-0.52. The optical imaging lens group meets the requirement that f6/f is more than-1.0 and less than-0.5, is favorable for increasing the focal length of the system, realizes the long-focus characteristic, has the function of adjusting the light position and shortens the total length of the optical imaging lens group. Optionally, the sixth lens has a negative optical power.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 1.5 < R4/R5 < 3.0, where R4 is a radius of curvature of an image-side surface of the second lens and R5 is a radius of curvature of an object-side surface of the third lens. More specifically, R4 and R5 can further satisfy 1.67. ltoreq. R4/R5. ltoreq.2.52. The curvature radius R4 of the image side surface of the second lens and the curvature radius R5 of the object side surface of the third lens meet 1.5 < R4/R5 < 3.0, which is beneficial to reducing the focal power of the image side surface lens of the optical system and ensuring that the optical system has better capability of balancing chromatic aberration and distortion. Optionally, the image-side surface of the second lens element is a concave surface, and the object-side surface of the third lens element is a convex surface.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.5 < R7/R8 ≦ 1.5, 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 0.96 ≦ R7/R8 ≦ 1.47. The ratio of the curvature radius of the image side surface of the fourth lens to the curvature radius of the object side surface of the fourth lens is reasonably distributed, so that the imaging lens can better match the chief ray angle of the chip, and the imaging quality of the imaging lens group is improved.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 1.5 < R11/R12 < 3.0, where R11 is a radius of curvature of an object-side surface of the sixth lens and R12 is a radius of curvature of an image-side surface of the sixth lens. More specifically, R11 and R12 can further satisfy 1.62. ltoreq. R11/R12. ltoreq.2.68. The ratio of the curvature radius of the sixth lens element image side surface of the optical imaging lens assembly to the curvature radius of the sixth lens element object side surface is reasonably controlled, so that the chromatic aberration and distortion of the optical imaging lens assembly can be effectively improved. Optionally, an object-side surface of the sixth lens element is convex, and an image-side surface of the sixth lens element is concave.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 3.0 < CT1/(CT2+ CT3) < 3.5, where CT1 is a central thickness of the first lens on the optical axis, CT2 is a central thickness of the second lens on the optical axis, and CT3 is a central thickness of the third lens on the optical axis. More specifically, CT1, CT2 and CT3 further satisfy 3.08. ltoreq. CT1/(CT2+ CT 3. ltoreq.3.39. The optical imaging lens group meets the requirements that CT1/(CT2+ CT3) < 3.0, the size of the rear end of the system can be effectively reduced, the overlarge size of the optical system lens group is avoided, the assembly difficulty of the lens is reduced, and the high space utilization rate is realized.

In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 6.0 < T34/(T12+ T23+ T45+ T56) < 10.1, where T34 is an air interval of the third lens and the fourth lens on the optical axis, T12 is a separation distance of the first lens and the second lens on the optical axis, T23 is an air interval of the second lens and the third lens on the optical axis, T45 is a separation distance of the fourth lens and the fifth lens on the optical axis, and T56 is a separation distance of the fifth lens and the sixth lens on the optical axis. More specifically, T34, T12, T23, T45 and T56 further satisfy 6.30 ≦ T34/(T12+ T23+ T45+ T56) ≦ 10.04. The optical imaging lens group satisfies 6.0 < T34/(T12+ T23+ T45+ T56) < 10.1, and can ensure that enough space is reserved between the lenses, thereby ensuring that the freedom of lens surface change is higher, and further improving the capability of the system for correcting astigmatism and curvature of field.

In an exemplary embodiment, the optical imaging lens group may further include at least one diaphragm. The diaphragm may be disposed at an appropriate position as required, for example, between the prism 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 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 system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the machinability of the imaging system 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. By providing a prism in front of the first lens, the arrangement direction of the lens can be changed, so that the lens can have a longer total optical length without affecting the miniaturization of the apparatus.

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

Example 1

An optical imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic structural 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 along an optical axis, comprises: a prism, 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 prism may reflect light incident on the prism in the direction of the Y optical axis and then emit the light from the prism in the direction of the X optical axis. 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 concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

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

TABLE 1

Where f is the total effective focal length of the optical imaging lens, the Semi-FOV is half of the maximum field angle of the optical imaging lens, and TTL is the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15.

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

-8.2277E-04

-2.0403E-04

2.0926E-04

-1.6450E-04

7.5143E-05

-2.0892E-05

3.4799E-06

-3.1932E-07

1.2430E-08

S2

-1.1106E-02

4.1588E-02

-5.4886E-02

4.0895E-02

-1.8011E-02

4.6732E-03

-6.7019E-04

4.4467E-05

-7.2580E-07

S3

1.5045E-02

4.0857E-02

-6.6709E-02

5.2230E-02

-2.3322E-02

5.9940E-03

-8.2288E-04

4.8093E-05

-3.7216E-07

S4

1.0890E-02

9.5986E-02

-1.9274E-01

2.2361E-01

-1.7115E-01

8.7999E-02

-2.9140E-02

5.5765E-03

-4.6518E-04

S5

-3.7193E-02

1.1262E-01

-2.1226E-01

2.5793E-01

-2.0754E-01

1.1012E-01

-3.6792E-02

6.9770E-03

-5.6969E-04

S6

-2.1767E-02

1.6344E-02

-3.0072E-02

4.5456E-02

-4.4729E-02

2.7603E-02

-1.0235E-02

2.0797E-03

-1.7719E-04

S7

-1.3966E-03

-1.8560E-03

-3.4694E-04

-2.0106E-02

3.1465E-02

-2.2819E-02

8.9910E-03

-1.8709E-03

1.6135E-04

S8

-3.0079E-02

6.9615E-02

-9.9480E-02

6.7783E-02

-1.9717E-02

-2.7654E-03

3.7802E-03

-1.0417E-03

9.9803E-05

S9

-1.5121E-01

1.6033E-01

-1.1094E-01

-2.5470E-02

1.0765E-01

-8.5274E-02

3.3609E-02

-6.8255E-03

5.6976E-04

S10

4.5440E-03

-1.1573E-01

3.8655E-01

-5.6480E-01

4.5798E-01

-2.2319E-01

6.5430E-02

-1.0671E-02

7.4557E-04

S11

2.9795E-02

-2.0998E-01

4.8416E-01

-5.6923E-01

3.9286E-01

-1.6680E-01

4.3059E-02

-6.2185E-03

3.8613E-04

S12

-1.0072E-01

-2.3347E-04

7.4744E-02

-8.3358E-02

4.5089E-02

-1.2743E-02

1.4716E-03

7.0721E-05

-2.3170E-05

TABLE 2

Fig. 2A shows on-axis chromatic aberration curves of the optical imaging lens group of embodiment 1, which represent the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 of embodiment 1, which represents the deviation of different image heights on the imaging plane after the light passes through the system. 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. For the convenience of description,

as shown in fig. 3, the optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises: a prism, 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 prism may reflect light incident on the prism in the direction of the Y optical axis and then emit the light from the prism in the direction of the X optical axis. 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 negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 3 shows a basic parameter table of the optical imaging lens group of embodiment 2, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 3

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 4

Fig. 4A shows on-axis chromatic aberration curves of the optical imaging lens group of embodiment 2, which represent the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 of embodiment 2, which represents the deviation of different image heights on the imaging plane after the light passes through the system. 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 along an optical axis, comprises: a prism, 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 prism may reflect light incident on the prism in the direction of the Y optical axis and then emit the light from the prism in the direction of the X optical axis. The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 5 shows a basic parameter table of the optical imaging lens group of embodiment 1, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 5

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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-7.6716E-04

-1.6930E-04

1.7972E-04

-1.4127E-04

6.4134E-05

-1.7642E-05

2.9001E-06

-2.6235E-07

1.0065E-08

S2

-1.1796E-02

4.1818E-02

-5.4149E-02

4.0185E-02

-1.7805E-02

4.7159E-03

-7.1057E-04

5.3415E-05

-1.3892E-06

S3

1.4480E-02

4.4222E-02

-7.2181E-02

5.6811E-02

-2.5664E-02

6.7579E-03

-9.7698E-04

6.5271E-05

-1.1442E-06

S4

1.1094E-02

9.5731E-02

-1.9063E-01

2.1832E-01

-1.6511E-01

8.4020E-02

-2.7546E-02

5.2164E-03

-4.3013E-04

S5

-3.6126E-02

1.0753E-01

-2.0237E-01

2.4725E-01

-1.9979E-01

1.0602E-01

-3.5270E-02

6.6341E-03

-5.3589E-04

S6

-2.0632E-02

1.5043E-02

-2.9173E-02

4.5871E-02

-4.5670E-02

2.8071E-02

-1.0296E-02

2.0631E-03

-1.7336E-04

S7

1.7120E-03

-9.2260E-03

5.6299E-03

-2.0177E-02

2.7591E-02

-1.9541E-02

7.6760E-03

-1.5990E-03

1.3788E-04

S8

-2.4263E-02

5.7483E-02

-8.8234E-02

6.4905E-02

-2.3216E-02

8.4779E-04

2.2912E-03

-7.3929E-04

7.4773E-05

S9

-1.3172E-01

1.1783E-01

-5.5521E-02

-6.2953E-02

1.1742E-01

-8.2359E-02

3.0769E-02

-6.0522E-03

4.9387E-04

S10

1.0931E-02

-1.5137E-01

4.5979E-01

-6.3949E-01

5.0145E-01

-2.3782E-01

6.8010E-02

-1.0827E-02

7.3844E-04

S11

2.3681E-02

-1.9713E-01

4.6894E-01

-5.5565E-01

3.8331E-01

-1.6186E-01

4.1382E-02

-5.8936E-03

3.5933E-04

S12

-9.1455E-02

8.0030E-03

4.4142E-02

-4.4406E-02

1.7039E-02

-2.5828E-04

-1.9368E-03

5.9477E-04

-5.7885E-05

TABLE 6

Fig. 6A shows on-axis chromatic aberration curves of the optical imaging lens group of embodiment 3, which represent the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 on the imaging plane after the light passes through the system. 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 along an optical axis, comprises: a prism, 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 prism may reflect light incident on the prism in the direction of the Y optical axis and then emit the light from the prism in the direction of the X optical axis. 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 concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. 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 7 shows a basic parameter table of the optical imaging lens group of embodiment 4, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 7

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.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-7.4148E-04

-1.7005E-04

2.0209E-04

-1.6533E-04

7.7784E-05

-2.2141E-05

3.7677E-06

-3.5310E-07

1.4045E-08

S2

-1.1330E-02

4.1260E-02

-5.5625E-02

4.4170E-02

-2.1602E-02

6.5898E-03

-1.2212E-03

1.2624E-04

-5.6284E-06

S3

1.2635E-02

5.3409E-02

-9.1497E-02

7.9219E-02

-4.1163E-02

1.3294E-02

-2.6236E-03

2.9292E-04

-1.4443E-05

S4

9.3141E-03

1.0636E-01

-2.1891E-01

2.6120E-01

-2.0534E-01

1.0775E-01

-3.6103E-02

6.9373E-03

-5.7783E-04

S5

-3.4869E-02

1.0628E-01

-2.1242E-01

2.7799E-01

-2.3950E-01

1.3409E-01

-4.6554E-02

9.0577E-03

-7.5191E-04

S6

-1.9959E-02

1.2855E-02

-2.8551E-02

5.2264E-02

-5.7873E-02

3.8446E-02

-1.5005E-02

3.1711E-03

-2.7963E-04

S7

4.7933E-03

-1.8094E-02

1.9076E-02

-3.6557E-02

4.3341E-02

-2.9825E-02

1.1746E-02

-2.4688E-03

2.1465E-04

S8

-2.9813E-02

8.0009E-02

-1.3112E-01

1.1104E-01

-5.1830E-02

1.0842E-02

5.4017E-04

-6.4744E-04

8.1470E-05

S9

-1.4254E-01

1.6794E-01

-1.6549E-01

8.4620E-02

-3.5575E-03

-2.1428E-02

1.2244E-02

-2.9047E-03

2.6211E-04

S10

1.9973E-03

-7.2412E-02

2.4460E-01

-3.4502E-01

2.6659E-01

-1.2345E-01

3.4355E-02

-5.3013E-03

3.4781E-04

S11

7.0674E-03

-1.0295E-01

2.6137E-01

-3.1076E-01

2.1077E-01

-8.6804E-02

2.1548E-02

-2.9621E-03

1.7248E-04

S12

-1.0240E-01

3.7828E-02

3.4215E-03

-1.1164E-02

8.5039E-04

4.0842E-03

-2.4135E-03

5.7156E-04

-5.1016E-05

TABLE 8

Fig. 8A shows on-axis chromatic aberration curves of the optical imaging lens group of embodiment 4, which represent the convergent focus deviations of light rays of different wavelengths after passing through the system. 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 of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the system. 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 along an optical axis, comprises: a prism, 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 prism may reflect light incident on the prism in the direction of the Y optical axis and then emit the light from the prism in the direction of the X optical axis. 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 negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 9 shows a basic parameter table of the optical imaging lens group of embodiment 5, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 9

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.

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 system. 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 on the imaging plane after the light passes through the system. As can be seen from fig. 10A to 10D, the optical imaging lens assembly of embodiment 5 can achieve good imaging quality.

Example 6

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

As shown in fig. 11, the optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises: a prism, 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 prism may reflect light incident on the prism in the direction of the Y optical axis and then emit the light from the prism in the direction of the X optical axis. 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 negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 11 shows a basic parameter table of the optical imaging lens group of embodiment 6, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 11

Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-6.2526E-04

-3.4188E-04

3.1664E-04

-2.1409E-04

9.0936E-05

-2.4379E-05

3.9936E-06

-3.6398E-07

1.4140E-08

S2

-8.6511E-03

3.1954E-02

-4.2752E-02

3.3195E-02

-1.5232E-02

4.0597E-03

-5.7027E-04

2.9893E-05

5.2865E-07

S3

1.5549E-02

4.0287E-02

-7.1373E-02

6.2323E-02

-3.2287E-02

1.0219E-02

-1.9213E-03

1.9525E-04

-8.1778E-06

S4

2.1854E-03

1.3952E-01

-2.7425E-01

3.0080E-01

-2.0650E-01

9.0945E-02

-2.5079E-02

3.9653E-03

-2.7585E-04

S5

-4.7018E-02

1.5900E-01

-2.9574E-01

3.2980E-01

-2.3251E-01

1.0538E-01

-2.9881E-02

4.8454E-03

-3.4405E-04

S6

-2.1392E-02

2.0101E-02

-3.3845E-02

4.0037E-02

-3.0944E-02

1.5704E-02

-5.0644E-03

9.4604E-04

-7.7758E-05

S7

2.5909E-02

-8.7243E-02

2.1136E-01

-3.5513E-01

3.5963E-01

-2.2218E-01

8.1927E-02

-1.6555E-02

1.4085E-03

S8

-1.7399E-01

4.4370E-01

-5.8445E-01

4.2374E-01

-1.5818E-01

1.2487E-02

1.2255E-02

-4.3546E-03

4.5817E-04

S9

-3.0252E-01

5.0305E-01

-4.9155E-01

2.2108E-01

1.2085E-02

-6.6247E-02

3.3591E-02

-7.5967E-03

6.7709E-04

S10

4.5857E-02

-2.4978E-01

6.1720E-01

-7.8499E-01

5.8161E-01

-2.6507E-01

7.3854E-02

-1.1614E-02

7.9340E-04

S11

1.8754E-02

-1.5500E-01

3.1823E-01

-3.2672E-01

1.9836E-01

-7.5483E-02

1.7948E-02

-2.4688E-03

1.5145E-04

S12

-8.4442E-02

-1.8183E-02

1.0046E-01

-1.1345E-01

7.1998E-02

-2.9209E-02

7.6297E-03

-1.1776E-03

8.1464E-05

TABLE 12

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

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

Conditional expression (A) example	1	2	3	4	5	6
							TTL/f	0.89	0.89	0.88	0.88	0.88	0.88
f2/f1	-1.09	-1.12	-1.08	-1.10	-1.44	-1.27
							f6/f	-0.52	-0.70	-0.66	-0.57	-0.59	-0.85
R4/R5	1.74	1.70	1.67	1.70	2.52	2.36
							R7/R8	1.42	1.47	1.41	1.34	1.41	0.96
R11/R12	2.49	2.01	2.10	2.68	2.32	1.62
							CT1/(CT2+CT3)	3.08	3.31	3.23	3.36	3.39	3.31
T34/(T12+T23+T45+T56)	7.70	6.30	8.67	10.04	7.87	9.75
							f1/CT1	3.07	2.98	3.09	3.02	2.47	2.77

Watch 13

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

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

Claims

1. An optical imaging lens group, characterized in that the optical imaging lens group comprises:

a prism configured such that light incident on the prism in a direction of a Y optical axis is reflected and then exits the prism in a direction of an X optical axis, wherein the X optical axis is perpendicular to the Y optical axis;

the optical imaging lens group further comprises, in order from the prism to an image side along the X-ray axis:

a first lens having a positive optical power;

a second lens having a negative optical power;

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

a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface;

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

the sixth lens with focal power, wherein 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 TTL/f < 1; and

the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy 3.0 < CT1/(CT2+ CT3) < 3.5.

2. The optical imaging lens group of claim 1 wherein the effective focal length f1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy 2.4 < f1/CT1 < 3.1.

3. The optical imaging lens group of claim 1 wherein the effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy-1.5 < f2/f1 < -1.

4. The optical imaging lens group of claim 1, wherein the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging lens group satisfy-1.0 < f6/f < -0.5.

5. The optical imaging lens group of claim 1 wherein the radius of curvature R4 of the image side surface of the second lens and the radius of curvature R5 of the object side surface of the third lens satisfy 1.5 < R4/R5 < 3.0.

6. The optical imaging lens group of claim 1 wherein the radius of curvature R7 of the object side surface of the fourth lens element and the radius of curvature R8 of the image side surface of the fourth lens element satisfy 0.5 < R7/R8 ≦ 1.5.

7. The optical imaging lens group of claim 1 wherein the radius of curvature R11 of the object side surface of the sixth lens element and the radius of curvature R12 of the image side surface of the sixth lens element satisfy 1.5 < R11/R12 < 3.0.

8. The optical imaging lens group according to claim 1, wherein a spacing distance T34 on the optical axis of the third lens and the fourth lens, a spacing distance T12 on the optical axis of the first lens and the second lens, a spacing distance T23 on the optical axis of the second lens and the third lens, a spacing distance T45 on the optical axis of the fourth lens and the fifth lens, and a spacing distance T56 on the optical axis of the fifth lens and the sixth lens satisfy 6.0 < T34/(T12+ T23+ T45+ T56) < 10.1.

9. An optical imaging lens group, characterized in that the optical imaging lens group comprises:

a first lens having a positive optical power;

a second lens having a negative optical power;

a separation distance T34 on the optical axis of the third lens and the fourth lens, a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, a separation distance T45 on the optical axis of the fourth lens and the fifth lens, and a separation distance T56 on the optical axis of the fifth lens and the sixth lens satisfy 6.0 < T34/(T12+ T23+ T45+ T56) < 10.1.

10. The optical imaging lens group of claim 9 wherein the effective focal length f1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy 2.4 < f1/CT1 < 3.1.

11. The optical imaging lens group of claim 9 wherein the effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy-1.5 < f2/f1 < -1.

12. The optical imaging lens group of claim 9, wherein the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging lens group satisfy-1.0 < f6/f < -0.5.

13. The optical imaging lens group of claim 9 wherein the radius of curvature R4 of the image side surface of the second lens and the radius of curvature R5 of the object side surface of the third lens satisfy 1.5 < R4/R5 < 3.0.

14. The optical imaging lens group of claim 9 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 0.5 < R7/R8 ≦ 1.5.

15. The optical imaging lens group of claim 12 wherein the radius of curvature R11 of the object side surface of the sixth lens element and the radius of curvature R12 of the image side surface of the sixth lens element satisfy 1.5 < R11/R12 < 3.0.

16. The optical imaging lens group of claim 10 wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy 3.0 < CT1/(CT2+ CT3) < 3.5.