CN111999872B - Lens - Google Patents
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- CN111999872B CN111999872B CN202011034229.9A CN202011034229A CN111999872B CN 111999872 B CN111999872 B CN 111999872B CN 202011034229 A CN202011034229 A CN 202011034229A CN 111999872 B CN111999872 B CN 111999872B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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Abstract
The invention discloses a lens, in which the lens is arranged from the object side according to a specific sequenceFive lens groups are sequentially arranged to the image side, the positions of the first lens group, the third lens group and the fifth lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis; the lens group satisfies the following conditions: -1.35. ltoreq. f 2/((f)w*ft)1/2)≤‑0.95；1.95≤f3/(fw*ft)≤2.75；3.56≤f5/((fw*ft)1/2) The conditions such as 3.96 are not more than, to a certain extent, lens target surface size and light ring have been increased, therefore the image resolution who gathers is higher, still can guarantee the printing opacity of camera lens under the low light level scene moreover for the image quality who obtains is better. Therefore, the embodiment of the invention provides an ultra-large target surface extra-star zoom lens.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Along with the development of society, people's safety precaution consciousness is constantly improved, and security protection monitoring industry also obtains high-speed development, and the effect of control performance is also bigger and bigger. The zoom lens has practical design and use in the last century, and with the development of lens design technology, the application occasions of the zoom lens are gradually increased. Nowadays, zoom lenses have been widely used in the fields of civil products, security monitoring, and the like. However, the zoom lens has poorer imaging quality than the common fixed focal length lens, so the use popularity of the zoom lens is not high. Most zoom lenses on the market are simple in structure and small in target surface size, so that the acquired image is low in resolution, the shooting effect is general, and the picture value is low. Most of the apertures of the zoom lenses on the market are small, so that the light transmission of the lenses is less, images obtained under a low-illumination scene are darker, and the image quality is difficult to guarantee. Therefore, it becomes important to develop an ultra-large target surface extra-star zoom lens.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a super-starlight zoom lens with a super-large target surface.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group and the image plane are sequentially arranged from an object side to an image side;
the positions of the first lens group, the third lens group and the fifth lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis;
the lens group satisfies the following conditions:
-1.35≤f2/((fw*ft)1/2)≤-0.95；
1.95≤f3/(fw*ft)≤2.75；
3.56≤f5/((fw*ft)1/2)≤3.96；
wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f5 is the focal length of the fifth lens group, fWIs the system focal length f of the lens in a short-focus statetAnd the system focal length of the lens in a long-focus state is obtained.
Further, the first lens group includes a first sub-lens group and a second positive power lens arranged in order from the object side to the image side;
the first sub-lens group includes a first negative power lens and a first positive power lens; the curvature radius of the surface of the first negative focal power lens facing the image side is the same as that of the surface of the first positive focal power lens facing the object side;
the first negative power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the first positive power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the second positive power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
Further, the second lens group includes a second negative power lens and a second sub-lens group arranged in order from the object side to the image side;
the second sub-lens group comprises a third negative power lens and a third positive power lens; the curvature radius of the surface of the third negative power lens facing the image side is the same as that of the surface of the third positive power lens facing the object side;
the second negative focal power lens comprises a meniscus lens, and the surface of the meniscus lens facing the image side is a concave surface;
the third negative power lens comprises a biconcave lens;
the third positive power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
Further, the third lens group includes a third sub-lens group and a fourth sub-lens group arranged in order from the object side to the image side;
the third sub-lens group comprises a fourth negative power lens and a fourth positive power lens; the curvature radius of the surface of the fourth negative power lens facing the image side is the same as that of the surface of the fourth positive power lens facing the object side;
the fourth sub-lens group comprises a fifth negative focal power lens and a fifth positive focal power lens; the curvature radius of the surface of the fifth negative focal power lens facing the image side is the same as that of the surface of the fifth positive focal power lens facing the object side;
the fourth negative power lens comprises a biconcave lens;
the fourth positive power lens comprises a biconvex lens;
the fifth negative power lens comprises a meniscus lens or a concave flat lens, and the surface of the meniscus lens facing the object side is a concave surface;
the fifth positive power lens includes a meniscus lens or a plano-convex lens, and a surface thereof facing the image side is convex.
Further, the fourth lens group includes a sixth positive power lens, a fifth sub-lens group, a ninth positive power lens, and a seventh negative power lens arranged in order from the object side to the image side;
the fifth sub-lens group comprises a seventh positive focal power lens, a sixth negative focal power lens and an eighth positive focal power lens; the curvature radius of the surface of the seventh positive power lens facing the image side is the same as that of the surface of the sixth negative power lens facing the object side; the curvature radius of the surface of the sixth negative power lens facing the image side is the same as that of the surface of the eighth positive power lens facing the object side;
the sixth positive focal power lens comprises a biconvex lens, and two surfaces of the biconvex lens are even aspheric surfaces;
the seventh positive power lens includes a biconvex lens;
the sixth negative power lens comprises a biconcave lens;
the eighth positive power lens includes a biconvex lens;
the ninth positive power lens includes a biconvex lens;
the seventh negative power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
Further, the fifth lens group includes an eighth negative power lens and a tenth positive power lens arranged in order from the object side to the image side;
the eighth negative power lens comprises a biconcave lens;
the tenth positive power lens includes a double convex lens.
Further, the refractive indexes of the fourth positive power lens, the fifth negative power lens and the tenth positive power lens are all larger than or equal to 1.9.
Further, the abbe numbers of the fourth negative power lens, the sixth positive power lens and the eighth positive power lens are all more than or equal to 65.
Further, an aperture diaphragm is arranged between the second lens group and the third lens group.
Further, an optical filter is arranged between the fifth lens group and the image plane.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group and the image plane are sequentially arranged from an object side to an image side; the positions of the first lens group, the third lens group and the fifth lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis; the lens group satisfies the following conditions: -1.35. ltoreq. f 2/((f)w*ft)1/2)≤-0.95；1.95≤f3/(fw*ft)≤2.75；3.56≤f5/((fw*ft)1/2) Less than or equal to 3.96; wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f5 is the focal length of the fifth lens group, fWThe system focal length of the lens in the short-focus state,ftand the system focal length of the lens in a long-focus state is obtained.
Since five lens groups are arranged in order from the object side to the image side in a specific order in the lens barrel in the embodiment of the present invention, the positions of the first lens group, the third lens group, and the fifth lens group are fixed, and the second lens group and the fourth lens group are movable along the optical axis; the lens group satisfies the following conditions: -1.35. ltoreq. f 2/((f)w*ft)1/2)≤-0.95；1.95≤f3/(fw*ft)≤2.75；3.56≤f5/((fw*ft)1/2) The conditions such as 3.96 are not more than, to a certain extent, lens target surface size and light ring have been increased, therefore the image resolution who gathers is higher, still can guarantee the printing opacity of camera lens under the low light level scene moreover for the image quality who obtains is better. Therefore, the embodiment of the invention provides an ultra-large target surface extra-star zoom lens.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a lens in a short focus state according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lens in a telephoto state according to an embodiment of the present invention;
fig. 3 is a graph of an optical transfer function (MTF) of a lens provided in embodiment 1 of the present invention in a wide-angle state in a visible light band;
fig. 4 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 in a long focus state in a visible light band.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of a lens barrel according to embodiment 1 of the present invention, and the lens barrel includes, in order from an object side to an image side, a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and an image plane N;
the positions of the first lens group, the third lens group and the fifth lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis;
the lens group satisfies the following conditions:
-1.35≤f2/((fw*ft)1/2)≤-0.95；
1.95≤f3/(fw*ft)≤2.75；
3.56≤f5/((fw*ft)1/2)≤3.96；
wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f5 is the focal length of the fifth lens group, fWIs the system focal length f of the lens in a short-focus statetAnd the system focal length of the lens in a long-focus state is obtained.
The lens barrel can realize zooming by changing the positions of lens groups, wherein the positions of the first lens group, the third lens group and the fifth lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis to realize zooming. That is, the second lens group can be moved in a position between the first lens group and the third lens group. The second lens group may be close to the first lens group, far from the third lens group; it may be away from the first lens group and close to the third lens group. The fourth lens group may be moved in a position between the third lens group and the fifth lens group. The second lens group is a zoom lens group, and the movement of the second lens group has a large influence on the focal length of the lens. The fourth lens group is a compensation lens group, and fine adjustment of the focal length is realized by movement of the fourth lens group. By disposing the second lens group and the fourth lens group as lens groups movable along the optical axis, zooming and focusing of the lens are achieved.
In the lens system provided by the embodiment of the invention, each lens group has a corresponding focal length f, and the lens system has a corresponding system focal length f in a long-focus statetIn the short focus state, there is a corresponding system focal length fW. In order to provide an ultra-large target surface extra-star zoom lens, the lens group satisfies the following relation:
-1.35≤f2/((fw*ft)1/2)≤-0.95；
1.95≤f3/(fw*ft)≤2.75；
3.56≤f5/((fw*ft)1/2)≤3.96。
since five lens groups are arranged in order from the object side to the image side in a specific order in the lens barrel in the embodiment of the present invention, the positions of the first lens group, the third lens group, and the fifth lens group are fixed, and the second lens group and the fourth lens group are movable along the optical axis; the lens group satisfies the following conditions: -1.35. ltoreq. f 2/((f)w*ft)1/2)≤-0.95；1.95≤f3/(fw*ft)≤2.75；3.56≤f5/((fw*ft)1/2) The conditions such as 3.96 are not more than, to a certain extent, lens target surface size and light ring have been increased, therefore the image resolution who gathers is higher, still can guarantee the printing opacity of camera lens under the low light level scene moreover for the image quality who obtains is better. Therefore, the embodiment of the invention provides an ultra-large target surface extra-star zoom lens.
Generally, when light rays of a spherical lens enter the lens and then reach a focal plane, serious refraction and bending are easily generated at the edge part of the spherical lens than at the central part of the spherical lens, and the phenomenon can cause the reduction of sharpness and contrast and the generation of light spots, thereby causing the reduction of image quality. And such aberrations are called spherical aberrations. In an embodiment of the present invention, a lens group satisfies the following conditions: -1.35. ltoreq. f 2/((f)w*ft)1/2)≤-0.95；1.95≤f3/(fw*ft)≤2.75；3.56≤f5/((fw*ft)1/2) Less than or equal to 3.96, and the lens length, the spherical aberration and the manufacturability of the lens。
In order to further improve the imaging quality of the lens barrel, in the embodiment of the present invention, the first lens group includes a first sub-lens group and a second positive power lens L13 arranged in order from the object side to the image side;
the first sub-lens group includes a first negative power lens L11 and a first positive power lens L12; the curvature radius of the surface of the first negative focal power lens facing the image side is the same as that of the surface of the first positive focal power lens facing the object side;
the first negative power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the first positive power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the second positive power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
To further enable the system to be compact, the first negative power lens L11 and the first positive power lens L12 may be cemented or otherwise attached.
The second lens group comprises a second negative power lens L21 and a second sub-lens group which are arranged in sequence from the object side to the image side;
the second sub-lens group includes a third negative power lens L22 and a third positive power lens L23; the curvature radius of the surface of the third negative power lens facing the image side is the same as that of the surface of the third positive power lens facing the object side;
the second negative focal power lens comprises a meniscus lens, and the surface of the meniscus lens facing the image side is a concave surface;
the third negative power lens comprises a biconcave lens;
the third positive power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
To further enable the system to be compact, the third negative power lens L22 and the third positive power lens L23 may be cemented or otherwise attached.
The third lens group comprises a third sub-lens group and a fourth sub-lens group which are arranged in sequence from the object side to the image side;
the third sub-lens group includes a fourth negative power lens L31 and a fourth positive power lens L32; the curvature radius of the surface of the fourth negative power lens facing the image side is the same as that of the surface of the fourth positive power lens facing the object side;
the fourth sub-lens group includes a fifth negative power lens L33 and a fifth positive power lens L34; the curvature radius of the surface of the fifth negative focal power lens facing the image side is the same as that of the surface of the fifth positive focal power lens facing the object side;
the fourth negative power lens comprises a biconcave lens;
the fourth positive power lens comprises a biconvex lens;
the fifth negative power lens comprises a meniscus lens or a concave flat lens, and the surface of the meniscus lens facing the object side is a concave surface;
the fifth positive power lens includes a meniscus lens or a plano-convex lens, and a surface thereof facing the image side is convex.
To further enable the system to be compact, the fourth negative power lens L31 and the fourth positive power lens L32 may be cemented or otherwise snugly connected. The fifth negative power lens L33 and the fifth positive power lens L34 may be cemented or adhesively connected.
The fourth lens group comprises a sixth positive power lens L41, a fifth sub-lens group, a ninth positive power lens L45 and a seventh negative power lens L46 which are arranged in sequence from the object side to the image side;
the fifth sub-lens group includes a seventh positive power lens L42, a sixth negative power lens L43, and an eighth positive power lens L44; the curvature radius of the surface of the seventh positive power lens facing the image side is the same as that of the surface of the sixth negative power lens facing the object side; the curvature radius of the surface of the sixth negative power lens facing the image side is the same as that of the surface of the eighth positive power lens facing the object side;
the sixth positive focal power lens comprises a biconvex lens, and two surfaces of the biconvex lens are even aspheric surfaces;
the seventh positive power lens includes a biconvex lens;
the sixth negative power lens comprises a biconcave lens;
the eighth positive power lens includes a biconvex lens;
the ninth positive power lens includes a biconvex lens;
the seventh negative power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
To further enable the system to be compact, the seventh positive power lens and the sixth negative power lens may be cemented or cemented; the sixth negative power lens and the eighth positive power lens may be cemented or adhesively connected.
The fifth lens group includes an eighth negative power lens L51 and a tenth positive power lens L52 arranged in order from the object side to the image side;
the eighth negative power lens comprises a biconcave lens;
the tenth positive power lens includes a double convex lens.
In order to increase the refractive index of the lens and reduce the total length of the lens, in the embodiment of the present invention, the refractive indexes of the fourth positive power lens, the fifth negative power lens and the tenth positive power lens are all greater than or equal to 1.9. The refractive indexes of the fourth positive focal power lens, the fifth negative focal power lens and the tenth positive focal power lens can be the same or different. And the refractive indexes of the fourth positive focal power lens, the fifth negative focal power lens and the tenth positive focal power lens are all larger than or equal to 1.9, so that the spherical aberration can be reduced, and the image quality can be improved.
In the embodiment of the present invention, in order to achieve day and night confocal and no thermalization in the full focal length of the lens, in the embodiment of the present invention, the abbe numbers of the fourth negative power lens, the sixth positive power lens and the eighth positive power lens are all equal to or greater than 65. The abbe numbers of the fourth negative focal power lens, the sixth positive focal power lens and the eighth positive focal power lens can be the same or different. The abbe numbers of the fourth negative focal power lens, the sixth positive focal power lens and the eighth positive focal power lens are all more than or equal to 65, and the chromatic aberration of the image can be reduced, so that the image quality is improved.
In the embodiment of the present invention, an aperture stop P is disposed between the second lens group and the third lens group.
Wherein, the aperture diaphragm is arranged at a position close to the front of the third lens group and is used for controlling the aperture and the area of the light beam entering the system.
The aperture size of the aperture diaphragm determines the aperture value of the lens and the depth of field during shooting, the aperture size can be fixed, or the aperture diaphragm with adjustable aperture can be placed according to the requirement to realize the adjustment of the clear aperture, namely the purpose of changing the aperture value of the lens and the depth of field is achieved.
In the embodiment of the present invention, an optical filter M is disposed between the fifth lens group and the image plane. Filters are optical devices used to select a desired wavelength band of radiation.
Fig. 1 is a schematic structural diagram of the lens in a short focus state, and fig. 2 is a schematic structural diagram of the lens in a long focus state.
The embodiment of the invention provides a continuous zooming optical lens with an ultra-large image surface, an ultra-large aperture and high resolution.
The following exemplifies the lens parameters provided by the embodiment of the present invention.
Example 1:
in a specific implementation, the radius of curvature R, the center thickness Tc, the refractive index Nd, and the abbe constant Vd of each lens of the lens system satisfy the conditions listed in table 1:
TABLE 1
Wherein the corresponding aspheric surfaces of the 18 th and 19 th surfaces can be expressed by the relationship between the rise Z and the caliber Y, R value, the cone coefficient K, the multiple term coefficients A4, A6, A8, A10, A12, A14 and A16:
Z＝[(1/R)2·Y]/1+[1-(1+k)(1/R)2·Y2]1/2+A4Y4+A6Y6+A8Y8+A10Y10+A12Y12+A14Y14+A16Y16；
coefficient of 18 th plane:
K＝-6.9633648；A4＝-3.0994926e-05；A6＝-2.2759337e-09；A8＝-5.9545098e-10；A10＝3.0737830e-12；A12＝-1.0459209e-14；A14＝0；A16＝0；
coefficient of the 19 th plane:
K＝-4.5749288e-01；A4＝7.5835557e-06；A6＝-1.9783225e-08；A8＝-3.8931290e-10；A10＝2.1018505e-12；A12＝-7.6506269e-15；A14＝0；A16＝0。
the lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 130 mm;
focal length f' of the lens: 12(W) -25 (T) mm;
angle of view of lens: 70.5(W) -38.8 (T);
optical distortion of the lens: -9.4% (W) — + 0.19% (T);
aperture F/#oflens system: f1.4;
size of a lens image plane: more than or equal to 1.1'.
Note: w represents short focus, and T represents long focus.
The imaging system provided by the present embodiment will be further described by analyzing the embodiments in detail.
The optical transfer function is used for evaluating the imaging quality of an imaging system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
As shown in fig. 3, a graph of the optical transfer function (MTF) of the imaging system in the wide-angle state of the visible light band; as shown in fig. 4, is a graph of the optical transfer function (MTF) of the imaging system in the visible wavelength band tele state. As can be seen from fig. 3 and 4, the optical transfer function (MTF) graph of the imaging system in the wide-angle state in the visible light portion is smooth and concentrated, and the average MTF value of the full field (half image height Y' is 8.8mm) reaches 0.55 or more; therefore, the imaging system provided by the embodiment can achieve high resolution, and meet the imaging requirement of a 1.1-inch 1200-thousand-pixel camera; meanwhile, in a long-focus state, an optical transfer function (MTF) curve graph of the lens provided by the proposal is smooth and concentrated, and the average value of the MTF of a full field of view (the half-image height Y' is 8.8mm) reaches over 0.6, so that high imaging quality can be kept, the lens is ensured to be suitable for a complex environment, and all-weather high-definition video monitoring is realized.
In summary, the embodiment of the invention provides an optical imaging lens with a large target surface, an ultra-large aperture and high resolution. The imaging system adopts 18 optical lenses with specific structural shapes, wherein 1 piece of glass aspheric lens is adopted and is arranged in sequence from the object side to the image side according to a specific sequence, and parameters such as refractive index, Abbe coefficient and the like of the lens are matched with imaging conditions through distribution of the optical power of each optical lens; therefore, on the premise of larger image surface, the large target surface, the oversized aperture and high resolution are simultaneously met, and further better low-light imaging performance, better color reducibility and better environmental adaptability are realized; the method can be widely applied to the field of security monitoring.
The lens provided by the embodiment of the invention has the following advantages:
1. the zoom lens with the ultra-large aperture (aperture F1.4) is realized, and meanwhile, the maximum imaging target surface can support an image sensor of 1.1';
2. the focal length section is designed, the key consideration is matched with the requirements of road monitoring, license plate recognition and traffic violation and law violation, and the monitoring requirements of new-generation products are met.
3. The near infrared spectrum confocal mode of the oversized-aperture oversized target surface lens is achieved, and active infrared light-supplementing night vision imaging can be achieved in the condition of no illumination environment.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image plane, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group and the image plane are sequentially arranged from an object side to an image side; the positions of the first lens group, the third lens group and the fifth lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis; the lens group satisfies the following conditions: -1.35. ltoreq. f 2/((f)w*ft)1/2)≤-0.95；1.95≤f3/(fw*ft)≤2.75；3.56≤f5/((fw*ft)1/2) Less than or equal to 3.96; wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f5 is the focal length of the fifth lens group, fWIs the system focal length f of the lens in a short-focus statetAnd the system focal length of the lens in a long-focus state is obtained.
Since five lens groups are arranged in order from the object side to the image side in a specific order in the lens barrel in the embodiment of the present invention, the positions of the first lens group, the third lens group, and the fifth lens group are fixed, and the second lens group and the fourth lens group are movable along the optical axis; the lens group satisfies the following conditions: -1.35. ltoreq. f 2/((f)w*ft)1/2)≤-0.95；1.95≤f3/(fw*ft)≤2.75；3.56≤f5/((fw*ft)1/2) The conditions such as 3.96 are not more than, to a certain extent, lens target surface size and light ring have been increased, therefore the image resolution who gathers is higher, still can guarantee the printing opacity of camera lens under the low light level scene moreover for the image quality who obtains is better. Therefore, the embodiment of the invention provides an ultra-large target surface extra-star zoom lens.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The lens is characterized by comprising a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an image surface which are sequentially arranged from an object side to an image side;
the positions of the first lens group, the third lens group and the fifth lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis;
the lens group satisfies the following conditions:
-1.35≤f2/((fw*ft)1/2)≤-1.2；
2.60≤f3/(fw*ft)≤2.75；
3.80≤f5/((fw*ft)1/2)≤3.96；
wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f5 is the focal length of the fifth lens group, fWIs the system focal length f of the lens in a short-focus statetThe system focal length of the lens in a long-focus state is obtained;
the first lens group consists of a first sub-lens group and a second positive power lens which are arranged in sequence from the object side to the image side;
the first sub-lens group is composed of a first negative focal power lens and a first positive focal power lens;
the second lens group consists of a second negative power lens and a second sub-lens group which are arranged in sequence from the object side to the image side;
the second sub-lens group is composed of a third negative focal power lens and a third positive focal power lens;
the third lens group is composed of a third sub-lens group and a fourth sub-lens group which are sequentially arranged from the object side to the image side;
the third sub-lens group is composed of a fourth negative focal power lens and a fourth positive focal power lens;
the fourth sub-lens group is composed of a fifth negative focal power lens and a fifth positive focal power lens;
the fourth lens group consists of a sixth positive focal power lens, a fifth sub-lens group, a ninth positive focal power lens and a seventh negative focal power lens which are arranged in sequence from the object side to the image side;
the fifth sub-lens group consists of a seventh positive focal power lens, a sixth negative focal power lens and an eighth positive focal power lens;
the fifth lens group is composed of an eighth negative focal power lens and a tenth positive focal power lens which are arranged in sequence from the object side to the image side;
the focal length of the first lens group is positive, and the focal length of the fourth lens group is positive.
2. The lens barrel according to claim 1, wherein a surface of the first negative power lens facing the image side and a surface of the first positive power lens facing the object side have the same radius of curvature;
the first negative focal power lens is a meniscus lens, and the surface of the first negative focal power lens facing the object side is a convex surface;
the first positive focal power lens is a meniscus lens, and the surface of the first positive focal power lens facing the object side is a convex surface;
the second positive power lens is a meniscus lens, and the surface of the second positive power lens facing the object side is a convex surface.
3. The lens barrel according to claim 1, wherein a surface of the third negative power lens facing the image side and a surface of the third positive power lens facing the object side have the same radius of curvature;
the second negative focal power lens is a meniscus lens, and the surface of the second negative focal power lens facing the image side is a concave surface;
the third negative focal power lens is a biconcave lens;
the third positive power lens is a meniscus lens, and the surface of the third positive power lens facing the object side is a convex surface.
4. The lens barrel according to claim 1, wherein a surface of the fourth negative power lens facing the image side and a surface of the fourth positive power lens facing the object side have the same radius of curvature;
the curvature radius of the surface of the fifth negative focal power lens facing the image side is the same as that of the surface of the fifth positive focal power lens facing the object side;
the fourth negative focal power lens is a biconcave lens;
the fourth positive focal power lens is a biconvex lens;
the fifth negative-power lens is a meniscus lens or a concave flat lens, and the surface of the fifth negative-power lens facing the object side is a concave surface;
the fifth positive focal power lens is a meniscus lens or a plano-convex lens, and the surface of the fifth positive focal power lens facing the image side is a convex surface.
5. The lens barrel according to claim 4, wherein a radius of curvature of a surface of the seventh positive power lens facing the image side and a radius of curvature of a surface of the sixth negative power lens facing the object side are the same; the curvature radius of the surface of the sixth negative power lens facing the image side is the same as that of the surface of the eighth positive power lens facing the object side;
the sixth positive focal power lens is a biconvex lens, and two surfaces of the sixth positive focal power lens are even aspheric surfaces;
the seventh positive focal power lens is a biconvex lens;
the sixth negative focal power lens is a biconcave lens;
the eighth positive focal power lens is a biconvex lens;
the ninth positive focal power lens is a biconvex lens;
the seventh negative power lens is a meniscus lens, and the surface of the seventh negative power lens facing the object side is a convex surface.
6. The lens barrel as claimed in claim 4, wherein the eighth negative power lens is a biconcave lens;
the tenth positive power lens is a biconvex lens.
7. The lens barrel as claimed in claim 6, wherein the fourth positive power lens, the fifth negative power lens and the tenth positive power lens each have a refractive index of 1.9 or more.
8. The lens barrel according to claim 5, wherein abbe numbers of the fourth negative power lens, the sixth positive power lens and the eighth positive power lens are 65 or more.
9. The lens barrel according to claim 1, wherein an aperture stop is provided between the second lens group and the third lens group.
10. The lens barrel according to claim 1, wherein an optical filter is disposed between the fifth lens group and the image plane.
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| JP4374853B2 (en) * | 2002-12-27 | 2009-12-02 | 株式会社ニコン | Anti-shake zoom lens |
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