CN110275279B - Optical imaging lens group - Google Patents

Optical imaging lens group Download PDF

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Publication number
CN110275279B
CN110275279B CN201910671509.1A CN201910671509A CN110275279B CN 110275279 B CN110275279 B CN 110275279B CN 201910671509 A CN201910671509 A CN 201910671509A CN 110275279 B CN110275279 B CN 110275279B
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lens
optical
optical imaging
lens group
optical axis
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CN110275279A (en
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高雪
闻人建科
赵烈烽
戴付建
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN202311730194.6A priority Critical patent/CN117518417A/en
Priority to CN201910671509.1A priority patent/CN110275279B/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The application discloses optical imaging lens group, it includes: and a prism configured such that light incident to the prism in a direction of a Y optical axis, which is perpendicular to the Y optical axis, is reflected and then emitted from the prism in a direction of an X optical axis. The optical imaging lens group further comprises, in order from the prism to the image side along the X-ray axis: a first lens having positive optical power; a second lens having negative optical power; 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 element with optical power having a concave object-side surface and a convex image-side surface; a fifth lens with optical power, wherein the object side surface of the fifth lens is a convex surface; 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 smaller than 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 < CT 1/(CT 2+ CT 3) < 3.5.

Description

Optical imaging lens group
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 science and technology, the market demand for imaging systems suitable for portable electronic products has increased. 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 shooting lens to a multi-shooting lens. A multi-shot lens often has a tele imaging system. Conventional tele lenses often cause unstable shooting due to conventional telescopic steering modes when shooting. In addition, conventional tele lenses generally have long optical lengths and cannot be adapted to increasingly miniaturized portable electronic products.
Disclosure of Invention
The present application provides an optical imaging lens group, e.g., a periscope type tele lens, applicable to portable electronic products, which at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
An aspect of the present application provides an optical imaging lens group including: and a prism configured such that light incident to the prism in a direction of a Y optical axis, which is perpendicular to the Y optical axis, is reflected and then emitted from the prism in a direction of an X optical axis. The optical imaging lens group further comprises, in order from the prism to the image side along the X-ray axis: a first lens having positive optical power; a second lens having negative optical power; 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 element with optical power having a concave object-side surface and a convex image-side surface; a fifth lens with optical power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens having optical power.
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 assembly on an optical axis and a total effective focal length f of the optical imaging lens assembly may 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 < CT 1/(CT 2+ CT 3) < 3.5.
In one embodiment, the effective focal length f1 of the first lens and the center 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 may satisfy-1.5 < f2/f1 < -1.
In one embodiment, the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging lens group may satisfy-1.0 < f6/f < -0.5.
In one embodiment, the radius of curvature R4 of the image side of the second lens and the radius of curvature R5 of the object side of the third lens may 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 may satisfy 0.5 < R7/R8.ltoreq.1.5.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens may satisfy 1.5 < R11/R12 < 3.0.
In one embodiment, the distance T34 between the third lens and the fourth lens on the optical axis, the distance T12 between the first lens and the second lens on the optical axis, the distance T23 between the second lens and the third lens on the optical axis, the distance T45 between the fourth lens and the fifth lens on the optical axis, and the distance T56 between the fifth lens and the sixth lens on the optical axis may satisfy 6.0 < t34/(t12+t23+t45+t56) < 10.1.
According to the lens, 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 the 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 center thickness of each lens, the axial spacing 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, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 1;
fig. 3 shows a schematic structural view of 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 astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 2;
fig. 5 shows a schematic structural view 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 astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 3;
fig. 7 shows a schematic structural view of 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 astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 4;
fig. 9 shows a schematic structural view 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 astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 5;
fig. 11 shows a schematic structural view of an optical imaging lens group according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration 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 these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The optical imaging lens group according to the exemplary embodiment of the present application may include a prism and, for example, six lenses having optical power, 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 to the prism in the direction of the Y-axis is reflected and exits the prism in the direction of the X-axis, which is perpendicular to the Y-axis. The first lens element to the sixth lens element may be sequentially arranged along the X-ray axis from the prism to the image side. In the first lens to the sixth lens, any adjacent two lenses may have an air space therebetween.
In an exemplary embodiment, the first lens may have positive optical power; the second lens may have 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 element with positive or negative focal power has a concave object-side surface and a convex image-side 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 optical power or negative optical power. The low-order aberration of the control system is effectively balanced by reasonably controlling the positive and negative distribution of the optical power of each component of the system and the surface curvature of the lens.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy a condition of 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 can further satisfy 0.8 < TTL/f < 0.9. The optical imaging lens group meets TTL/f < 1, and can meet 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 center thickness of the first lens on the optical axis. More specifically, f1 and CT1 may further satisfy 2.46.ltoreq.f1/CT 1.ltoreq.3.09. If the optical power borne by the first lens is too large, the optical path tends to be large, and even a lens shape that is difficult to process is produced. The focal power of the first lens is reasonably controlled, so that the focal power born 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 condition-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 may further satisfy-1.44.ltoreq.f2/f1.ltoreq.1.08. In the case where the optical power of the first lens is negative, the optical 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 can be improved. The first lens and the second lens have different optical power signs, so that the optical system has better aberration balancing capability.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition that f6/f < -0.5 is less than-1.0, where f6 is an effective focal length of the sixth lens and f is a total effective focal length of the optical imaging lens group. More specifically, f6 and f may further satisfy-0.85.ltoreq.f6/f.ltoreq.0.52. The optical imaging lens group meets-1.0 < f6/f < -0.5, is beneficial to increasing the focal length of the system, realizing the characteristic of long focus, having the function of adjusting the light position and shortening the total length of the optical imaging lens group. Optionally, the sixth lens has 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 the image side surface of the second lens element and R5 is a radius of curvature of the object side surface of the third lens element. More specifically, R4 and R5 may 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 satisfy the condition that R4/R5 is smaller than 1.5 and smaller than 3.0, which is beneficial to reducing the focal power of the image side surface lens of the optical system, so that the optical system has better capability of balancing chromatic aberration and distortion. Optionally, the image side of the second lens element is concave, and the object side of the third lens element is convex.
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 element and R8 is a radius of curvature of an image side surface of the fourth lens element. More specifically, R7 and R8 may further satisfy 0.96.ltoreq.R7/R8.ltoreq.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 angle of the principal ray 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 element and R12 is a radius of curvature of an image side surface of the sixth lens element. More specifically, R11 and R12 may further satisfy 1.62.ltoreq.R11/R12.ltoreq.2.68. The ratio of the curvature radius of the image side surface of the sixth lens to the curvature radius of the object side surface of the sixth lens is reasonably controlled, so that the chromatic aberration and distortion of the optical imaging lens group can be effectively improved. Optionally, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 3.0 < CT 1/(CT 2+ct 3) < 3.5, where CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. More specifically, CT1, CT2 and CT3 can further satisfy 3.08.ltoreq.CT1/(CT2+CT3). Ltoreq.3.39. The optical imaging lens group satisfies 3.0 < CT 1/(CT 2+ CT 3) < 3.5, can effectively reduce the size of the rear end of the system, avoid the overlarge volume of the lens group of the optical system, reduce the assembly difficulty of the lenses and realize higher space utilization.
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 space on the optical axis of the third lens and the fourth lens, T12 is a space distance on the optical axis of the first lens and the second lens, T23 is an air space on the optical axis of the second lens and the third lens, T45 is a space distance on the optical axis of the fourth lens and the fifth lens, and T56 is a space distance on the optical axis of the fifth lens and the sixth lens. More specifically, T34, T12, T23, T45 and T56 may further satisfy 6.30.ltoreq.T34/(T12+T23+T45+T56). Ltoreq.10.04. The optical imaging lens group satisfies that T34/(T12+T23+T45+T56) < 10.1, and enough space can be formed between lenses, so that the degree of freedom of lens surface change is higher, and the capability of correcting astigmatism and field curvature of the system is improved.
In an exemplary embodiment, the optical imaging lens group may further include at least one diaphragm. The diaphragm may be provided 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 a photosensitive element located on the imaging surface.
The optical imaging lens group according to the above-described embodiments of the present application may employ a plurality of lenses, for example, six lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the processability 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. The prism is provided in front of the first lens, and the arrangement direction of the lenses can be changed, so that the lenses can have longer optical total length without affecting the miniaturization of the apparatus.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, 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 aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspherical mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the technical solutions claimed herein. For example, although six lenses are described as an example 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 desired.
Specific examples of the optical imaging lens group applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 1 of the present application.
As shown in fig. 1, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: 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, an optical filter E7, and an imaging surface S15.
The prism can make the light incident on the prism along the Y-axis direction exit from the prism along the X-axis direction after being reflected. The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 the basic parameter table of the optical imaging lens group of embodiment 1, in which the units of 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, semifov 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 to the sixth lens E6 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S12 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
Face number 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 an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 2B shows an astigmatism curve of the optical imaging lens group of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 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 magnification chromatic aberration curve of the optical imaging lens group of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the system. As can be seen from fig. 2A to 2D, the optical imaging lens group of embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 2 of the present application. For the convenience of description,
as shown in fig. 3, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: 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, an optical filter E7, and an imaging surface S15.
The prism can make the light incident on the prism along the Y-axis direction exit from the prism along the X-axis direction after being reflected. The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 the basic parameter table of the optical imaging lens group of embodiment 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 3 Table 3
Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 4 Table 4
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 4B shows an astigmatism curve of the optical imaging lens group of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 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 magnification chromatic aberration curve of the optical imaging lens group of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the system. As can be seen from fig. 4A to 4D, the optical imaging lens group according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural diagram of an optical imaging lens group according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: 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, an optical filter E7, and an imaging surface S15.
The prism can make the light incident on the prism along the Y-axis direction exit from the prism along the X-axis direction after being reflected. The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 the basic parameter table of the optical imaging lens group of embodiment 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 5
Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number 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 an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 6B shows an astigmatism curve of the optical imaging lens group of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 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 magnification chromatic aberration curve of the optical imaging lens group of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the system. As can be seen from fig. 6A to 6D, the optical imaging lens group provided in embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: 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, an optical filter E7, and an imaging surface S15.
The prism can make the light incident on the prism along the Y-axis direction exit from the prism along the X-axis direction after being reflected. The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 7
Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number 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 an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 8B shows an astigmatism curve of the optical imaging lens group of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 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 magnification chromatic aberration curve of the optical imaging lens group of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the system. As can be seen from fig. 8A to 8D, the optical imaging lens group provided in embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: 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, an optical filter E7, and an imaging surface S15.
The prism can make the light incident on the prism along the Y-axis direction exit from the prism along the X-axis direction after being reflected. The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 9
Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Table 10
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 5, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 10B shows an astigmatism curve of the optical imaging lens group of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 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 magnification chromatic aberration curve of the optical imaging lens group of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the system. As can be seen from fig. 10A to 10D, the optical imaging lens group provided in embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic 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 sequentially includes, from an object side to an image side along an optical axis: 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, an optical filter E7, and an imaging surface S15.
The prism can make the light incident on the prism along the Y-axis direction exit from the prism along the X-axis direction after being reflected. The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 11
Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -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 an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the system. Fig. 12B shows an astigmatism curve of the optical imaging lens group of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 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 magnification chromatic aberration curve of the optical imaging lens group of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the system. As can be seen from fig. 12A to 12D, the optical imaging lens group provided in embodiment 6 can achieve good imaging quality.
In summary, examples 1 to 6 satisfy the relationships shown in table 13, respectively.
Conditional\embodiment 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
TABLE 13
The present application also provides an image forming apparatus provided with an electron-sensitive element for forming an image, which may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the above-described optical imaging lens group.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (8)

1. The optical imaging lens group, its characterized in that, optical imaging lens group includes:
a prism configured such that light incident to the prism in a direction of a Y optical axis is reflected and then exits 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 group further comprises, in order from the prism to an image side along the X-ray axis:
a first lens with positive focal power, the object side surface of which is a convex surface;
a second lens having negative optical power, the image side surface of which is concave;
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 element with optical power having a concave object-side surface and a convex image-side surface;
a fifth lens with optical power, wherein the object side surface of the fifth lens is a convex surface;
a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface,
wherein at most one of the third lens, the fourth lens, and the fifth lens has negative optical power;
the number of lenses of the optical imaging lens with focal power is six;
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 0.8 < 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 meet the condition that 3.0 < CT 1/(CT 2+ CT 3) < 3.5.
2. The optical imaging lens group according to claim 1, wherein an effective focal length f1 of the first lens and a center thickness CT1 of the first lens on the optical axis satisfy 2.4 < f1/CT1 < 3.1.
3. The optical imaging lens group according to claim 1, wherein an effective focal length f2 of the second lens and an effective focal length f1 of the first lens satisfy-1.5 < f2/f1 < -1.
4. The optical imaging lens group according to claim 1, wherein an effective focal length f6 of the sixth lens and a total effective focal length f of the optical imaging lens group satisfy-1.0 < f6/f < -0.5.
5. The optical imaging lens assembly according to claim 1, wherein a radius of curvature R4 of an image side surface of the second lens and a radius of curvature R5 of an object side surface of the third lens satisfy 1.5 < R4/R5 < 3.0.
6. The optical imaging lens assembly according to claim 1, wherein a radius of curvature R7 of an object side surface of the fourth lens element and a radius of curvature R8 of an image side surface of the fourth lens element satisfy 0.5 < R7/R8. Ltoreq.1.5.
7. The optical imaging lens group according to claim 1, wherein 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 satisfy 1.5 < R11/R12 < 3.0.
8. The optical imaging lens group according to claim 1, wherein a separation distance T34 of the third lens and the fourth lens on the optical axis, a separation distance T12 of the first lens and the second lens on the optical axis, a separation distance T23 of the second lens and the third lens on the optical axis, a separation distance T45 of the fourth lens and the fifth lens on the optical axis, and a separation distance T56 of the fifth lens and the sixth lens on the optical axis satisfy 6.0 < t34/(t12+t23+t45+t56) < 10.1.
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