CN111781717B - Lens - Google Patents
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- CN111781717B CN111781717B CN202010709015.0A CN202010709015A CN111781717B CN 111781717 B CN111781717 B CN 111781717B CN 202010709015 A CN202010709015 A CN 202010709015A CN 111781717 B CN111781717 B CN 111781717B
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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
- G02B15/163—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
Abstract
The invention discloses a lens, which comprises a first lens group, a second lens group, a diaphragm, a third lens group, a fourth lens group, an optical filter and an image plane, wherein the first lens group, the second lens group, the diaphragm, the third lens group, the fourth lens group, the optical filter and the image plane are sequentially arranged from an object side to an image side; the first lens group and the third lens group are fixed in position, and the second lens group and the fourth lens group can beMoving along the optical axis; the lens group satisfies the following conditions: -1.4. ltoreq. f 2/((f)w·ft)1/2)≤‑0.8；0.75≤f3/(fw·ft)≤1.15；0.7≤f4/((fw·ft)1/2) Less than or equal to 1.1; wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f4 is the focal length of the fourth 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 embodiment of the invention provides a zoom lens with high performance such as large target surface size, large aperture, high resolution and the like.
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 is important to develop a zoom lens with high performance, such as large target surface size, large aperture, high resolution, etc.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a zoom lens with high performance such as large target surface size, large aperture, high resolution and the like.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a diaphragm, a third lens group, a fourth lens group, an optical filter and an image plane, wherein the first lens group, the second lens group, the diaphragm, the third lens group, the fourth lens group, the optical filter and the image plane are sequentially arranged from an object side to an image side;
the positions of the first lens group and the third 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:
-1.4≤f2/((fw·ft)1/2)≤-0.8；
0.75≤f3/(fw·ft)≤1.15；
0.7≤f4/((fw·ft)1/2)≤1.1；
wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f4 is the focal length of the fourth 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.
Further, the first sub-lens group includes a first negative power lens and a first positive power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the first negative focal power lens facing the image side is the same as that of one surface of the first positive focal power lens facing the object side;
the first negative focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a concave surface;
the first positive power lens comprises a biconvex lens;
the second positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens, which faces 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.
Further, the second sub-lens group includes a third negative power lens and a third positive power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the third negative focal power lens facing the image side is the same as that of one surface of the third positive focal power lens facing the object side;
the second negative power lens comprises a biconcave lens;
the third negative power lens comprises a biconcave lens;
the third positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens, which faces the object side, is convex.
Further, the third lens group includes a fourth positive power lens, a fourth negative power lens, and a third sub-lens group arranged in order from the object side to the image side.
Further, the third sub-lens group includes a fifth positive power lens and a fifth negative power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the fifth positive focal power lens facing the image side is the same as that of one surface of the fifth negative focal power lens facing the object side;
the fourth positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens, which faces the object side, is convex;
the fourth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the fifth positive power lens includes a biconvex lens;
the fifth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface.
Further, the fourth lens group includes a fourth sub-lens group, a seventh positive power lens, a fifth sub-lens group, and a sixth sub-lens group, which are arranged in order from the object side to the image side.
Further, the fourth sub-lens group includes a sixth positive power lens and a sixth negative power lens arranged in order from the object side to the image side; the curvature radius of one surface of the sixth positive focal power lens facing the image side is the same as that of one surface of the sixth negative focal power lens facing the object side;
the fifth sub-lens group comprises an eighth 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 curvature radius of one surface of the eighth positive focal power lens facing the image side is the same as that of one surface of the seventh negative focal power lens facing the object side;
the sixth sub-lens group comprises an eighth negative power lens and a ninth positive power lens which are arranged in sequence from the object side to the image side; the curvature radius of one surface of the eighth negative focal power lens facing the image side is the same as that of one surface of the ninth positive focal power lens facing the object side;
the sixth positive power lens includes a biconvex lens;
the sixth negative-power lens comprises a concave lens, and one surface of the concave lens facing the object side is a concave surface;
the seventh positive focal power lens comprises a biconvex lens, and two surfaces of the seventh positive focal power lens are even aspheric surfaces;
the eighth positive power lens includes a biconvex lens;
the seventh negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a concave surface;
the eighth negative power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the ninth positive power lens comprises a meniscus lens, and one surface of the meniscus lens facing the object side is a convex surface.
Further, the refractive index of each of the third positive power lens and the sixth positive power lens is greater than or equal to 1.9, and the refractive index of the seventh negative power lens is greater than or equal to 1.83;
and the abbe numbers of the third negative focal power lens, the fifth positive focal power lens and the seventh positive focal power lens are all more than or equal to 65.
The embodiment of the invention provides a lens, which comprises a first lens group, a second lens group, a diaphragm, a third lens group, a fourth lens group, an optical filter and an image plane, wherein the first lens group, the second lens group, the diaphragm, the third lens group, the fourth lens group, the optical filter and the image plane are sequentially arranged from an object side to an image side; the positions of the first lens group and the third 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: -1.4. ltoreq. f 2/((f)w·ft)1/2)≤-0.8；0.75≤f3/(fw·ft)≤1.15；0.7≤f4/((fw·ft)1/2) Less than or equal to 1.1; wherein f2 is the focal length of the second lens group, f3 isFocal length of the third lens group, f4 is focal length of the fourth 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 in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in a lens barrel in a specific order, the positions of the first lens group and the third lens group are fixed, the second lens group and the fourth lens group can move along the optical axis to realize lens zooming, and the lens groups in the lens barrel satisfy: -1.4. ltoreq. f 2/((f)w·ft)1/2)≤-0.8；0.75≤f3/(fw·ft)≤1.15；0.7≤f4/((fw·ft)1/2) The zoom lens has the advantages that the size of the target surface is not more than 1.1, and the zoom lens has high performance such as large target surface size, large aperture, high resolution and the like.
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 in a wide-angle state in a visible light band according to an embodiment of the present invention;
fig. 4 is a graph of an optical transfer function (MTF) of a lens in a long focus state in a visible light band according to an embodiment of the present invention.
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 an embodiment of the present disclosure, the lens barrel including a first lens group G1, a second lens group G2, a stop P, a third lens group G3, a fourth lens group G4, a filter N, and an image plane M, which are arranged in order from an object side to an image side;
the positions of the first lens group and the third 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:
-1.4≤f2/((fw·ft)1/2)≤-0.8；
0.75≤f3/(fw·ft)≤1.15；
0.7≤f4/((fw·ft)1/2)≤1.1；
wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f4 is the focal length of the fourth 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 the lens groups, wherein the positions of the first lens group and the third 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 position between the first lens group and the diaphragm. The second lens group can be close to the first lens group and far away from the diaphragm; or far away from the first lens group and close to the diaphragm. The fourth lens group may be moved in a position between the third lens group and the filter. The fourth lens group may be close to the third lens group, far from the filter; or far away from the third lens group and close to the filter. The second lens group moves in the optical axis direction to perform zooming, and is called a zoom group or a magnification-varying group. In addition, compensation is performed by moving the fourth lens group in the direction of the optical axis so that the image point variation caused by the second lens group at the image plane is zero, thereby realizing zooming without moving the image plane, which is called a compensation group. In addition, when the object of interest moves, the image is focused sharply by finely adjusting the fourth lens group. In general, in the lens system, the fourth lens group functions as a compensation group and a focusing group.
Since in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in a lens barrel in a specific order, the positions of the first lens group and the third lens group are fixed, the second lens group and the fourth lens group can move along the optical axis to realize lens zooming, and the lens groups in the lens barrel satisfy: -1.4. ltoreq. f 2/((f)w·ft)1/2)≤-0.8；0.75≤f3/(fw·ft)≤1.15；0.7≤f4/((fw·ft)1/2) The zoom lens has the advantages that the size of the target surface is not more than 1.1, and the zoom lens has high performance such as large target surface size, large aperture, high resolution and the like.
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.
In the embodiment of the invention, a diaphragm P is arranged between the second lens group and the third lens group.
The diaphragm comprises an aperture diaphragm, the aperture size of the aperture diaphragm determines the aperture value of the system 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 requirements to realize the adjustment of the clear aperture, namely the purposes of changing the aperture value of the system and changing the depth of field are achieved.
And an optical filter N is arranged between the fourth lens group and the image surface, and the optical filter is an optical device for selecting a required radiation waveband.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the 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 arranged in order from the object side to the image side;
the curvature radius of one surface of the first negative focal power lens facing the image side is the same as that of one surface of the first positive focal power lens facing the object side;
the first negative focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a concave surface;
the first positive power lens comprises a biconvex lens;
the second positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens, which faces the object side, is convex.
To further enable the system to be compact, the first negative power lens and the first positive power lens may be cemented or otherwise snugly connected.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, 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 arranged in order from the object side to the image side;
the curvature radius of one surface of the third negative focal power lens facing the image side is the same as that of one surface of the third positive focal power lens facing the object side;
the second negative power lens comprises a biconcave lens;
the third negative power lens comprises a biconcave lens;
the third positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens, which faces the object side, is convex.
To further enable the system to be compact, the third negative power lens and the third positive power lens may be cemented or otherwise snugly connected.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the third lens group includes a fourth positive power lens L31, a fourth negative power lens L32 and a third sub-lens group which are arranged in order from the object side to the image side.
The third sub-lens group includes a fifth positive power lens L33 and a fifth negative power lens L34 arranged in order from the object side to the image side;
the curvature radius of one surface of the fifth positive focal power lens facing the image side is the same as that of one surface of the fifth negative focal power lens facing the object side;
the fourth positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens, which faces the object side, is convex;
the fourth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the fifth positive power lens includes a biconvex lens;
the fifth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface.
To further enable the system to be compact, the fifth positive power lens and the fifth negative power lens may be cemented or cemented.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the fourth lens group comprises a fourth sub-lens group, a seventh positive power lens L43, a fifth sub-lens group and a sixth sub-lens group which are arranged in sequence from the object side to the image side.
The fourth sub-lens group includes a sixth positive power lens L41 and a sixth negative power lens L42 arranged in order from the object side to the image side; the curvature radius of one surface of the sixth positive focal power lens facing the image side is the same as that of one surface of the sixth negative focal power lens facing the object side;
the fifth sub-lens group includes an eighth positive power lens L44 and a seventh negative power lens L45 arranged in order from the object side to the image side; the curvature radius of one surface of the eighth positive focal power lens facing the image side is the same as that of one surface of the seventh negative focal power lens facing the object side;
the sixth sub-lens group includes an eighth negative power lens L46 and a ninth positive power lens L arranged in order from the object side to the image side; the curvature radius of one surface of the eighth negative focal power lens facing the image side is the same as that of one surface of the ninth positive focal power lens facing the object side;
the sixth positive power lens includes a biconvex lens;
the sixth negative-power lens comprises a concave lens, and one surface of the concave lens facing the object side is a concave surface;
the seventh positive focal power lens comprises a biconvex lens, and two surfaces of the seventh positive focal power lens are even aspheric surfaces;
the eighth positive power lens includes a biconvex lens;
the seventh negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a concave surface;
the eighth negative power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the ninth positive power lens comprises a meniscus lens, and one surface of the meniscus lens facing the object side is a convex surface.
To further enable the system to be compact, the sixth positive power lens and the sixth negative power lens may be cemented or cemented. The eighth positive power lens and the seventh negative power lens may be connected by gluing or fitting. The eighth negative power lens and the ninth positive power lens may be connected by gluing or fitting.
In the embodiment of the invention, in order to form images clearly at the lens from minus 30 ℃ to 70 ℃, in the embodiment of the invention, the abbe numbers of the third negative power lens, the fifth positive power lens and the seventh positive power lens are all more than or equal to 65. In addition, the abbe numbers of the third negative focal power lens, the fifth positive focal power lens and the seventh 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 imaging quality is improved. The abbe numbers of the third negative-power lens, the fifth positive-power lens and the seventh positive-power lens may be the same or different.
In order to improve the imaging quality of the lens and reduce the total length of the lens, in the embodiment of the invention, the refractive indexes of the third positive focal power lens and the sixth positive focal power lens are both greater than or equal to 1.9, and the refractive index of the seventh negative focal power lens is greater than or equal to 1.83. And the refractive index of the third positive focal power lens and the refractive index of the sixth positive focal power lens are both more than or equal to 1.9, and the refractive index of the seventh negative focal power lens is more than or equal to 1.83, so that the spherical aberration can be reduced, and the imaging quality can be improved. The refractive indexes of the third positive power lens and the sixth positive power lens can be the same or different.
The optical performance of the lens provided by the embodiment of the invention is as follows:
an image sensor which realizes a zoom lens with an ultra-large aperture (aperture F1.2) and can support 2/3' on the maximum imaging target surface; the focal length section is designed, the focal length section is mainly considered to be matched with the monitoring requirements required by the identification of the human face and the license plate of the large target surface monitoring camera, and the monitoring requirements of new-generation products are met; the system chromatic aberration is corrected within the spectral range of 435 to 850nm, and the infrared confocal function is realized; the mixed light has 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 22 th and 23 th surfaces can be expressed by the relation 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 22 th plane:
K＝-2.366353；A4＝-6.9816792e-006；A6＝5.2462477e-008；A8＝-5.8607605e-010；A10＝4.0304551e-012；A12＝-1.0356591e-014；A14＝0；A16＝0；
coefficient of the 23 rd plane:
K＝4.307097；A4＝2.5250298e-005；A6＝5.9711575e-008；A8＝-9.5840075e-010；A10＝1.0255654e-011；A12＝-4.4441517e-014；A14＝8.6340779e-017；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 116.6 mm;
focal length f' of the lens: 12(W) -38 (T) mm;
angle of view of lens: 58.8(W) -19.8 (T);
optical distortion of the lens: -8.4% (W) — + 4.6% (T);
aperture F/#oflens system: f1.2;
size of a lens image plane: not less than 2/3'.
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 the 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, it is a graph of the optical transfer function (MTF) of the lens in the wide-angle state of the visible light band; as shown in fig. 4, it is a graph of the optical transfer function (MTF) of the lens in the long focus state in the visible light band. As can be seen from fig. 3-4, the optical transfer function (MTF) curve of the imaging system in the wide-angle state in the visible light portion is relatively smooth and concentrated, and the average MTF value in the full field of view (half-image height Y' 6.4mm) reaches 0.5 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 6.4mm) reaches over 0.5, so that high imaging quality can be still 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. Adopting 17 optical lenses with specific structural shapes, comprising 1 glass aspheric lens, and arranging the optical lenses in sequence from the object side to the image side according to a specific sequence, and enabling parameters such as refractive index, Abbe coefficient and the like of the lenses to be 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 realizes the zoom lens with the ultra-large aperture (aperture F1.2), and meanwhile, the maximum imaging target surface can support an 2/3' image sensor; the design of the focal length section is mainly considered to be matched with the requirements required by road monitoring and license plate identification, so that the monitoring requirements of new-generation products are met; 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 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 (6)
1. The lens is characterized by comprising a first lens group, a second lens group, a diaphragm, a third lens group, a fourth lens group, an optical filter and an image plane which are sequentially arranged from an object side to an image side;
the positions of the first lens group and the third 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:
-1.4≤f2/((fw·ft)1/2)≤-1.19；
0.95≤f3/(fw·ft)≤1.15；
0.7≤f4/((fw·ft)1/2)≤0.9；
wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f4 is the focal length of the fourth 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 focal length of the first lens group is positive;
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 which are sequentially arranged from the object side to the image side;
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 which are sequentially arranged from the object side to the image side;
the third lens group consists of a fourth positive focal power lens, a fourth negative focal power lens and a third sub-lens group which are arranged in sequence from the object side to the image side;
the third sub-lens group is composed of a fifth positive focal power lens and a fifth negative focal power lens which are arranged in sequence from the object side to the image side;
the fourth lens group consists of a fourth sub-lens group, a seventh positive power lens, a fifth sub-lens group and a sixth sub-lens group which are arranged in sequence from the object side to the image side;
the fourth sub-lens group is composed of a sixth positive focal power lens and a sixth negative focal power lens which are arranged in sequence from the object side to the image side;
the fifth sub-lens group is composed of an eighth positive focal power lens and a seventh negative focal power lens which are sequentially arranged from the object side to the image side;
the sixth sub-lens group is composed of an eighth negative power lens and a ninth positive power lens which are arranged in order from the object side to the image side.
2. The lens barrel according to claim 1, wherein a surface of the first negative power lens facing the image side has the same radius of curvature as a surface of the first positive power lens facing the object side;
the first negative focal power lens is a meniscus lens, and one surface of the first negative focal power lens facing the image side is a concave surface;
the first positive focal power lens is a biconvex lens;
the second positive power lens is a convex lens, and one 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 has the same radius of curvature as a surface of the third positive power lens facing the object side;
the second negative focal power lens is a biconcave lens;
the third negative focal power lens is a biconcave lens;
the third positive power lens is a convex lens, and one 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 fifth positive power lens facing the image side and a surface of the fifth negative power lens facing the object side have the same radius of curvature;
the fourth positive focal power lens is a convex lens, and one surface of the fourth positive focal power lens facing the object side is a convex surface;
the fourth negative focal power lens is a meniscus lens, and one surface of the fourth negative focal power lens facing the image side is a convex surface;
the fifth positive focal power lens is a biconvex lens;
the fifth negative-power lens is a meniscus lens, and one surface of the fifth negative-power lens facing the image side is a convex surface.
5. The lens barrel according to claim 1, wherein a surface of the sixth positive power lens facing the image side and a surface of the sixth negative power lens facing the object side have the same radius of curvature;
the curvature radius of one surface of the eighth positive focal power lens facing the image side is the same as that of one surface of the seventh negative focal power lens facing the object side;
the curvature radius of one surface of the eighth negative focal power lens facing the image side is the same as that of one surface of the ninth positive focal power lens facing the object side;
the sixth positive focal power lens is a biconvex lens;
the sixth negative-power lens is a concave lens, and one surface of the sixth negative-power lens facing the object side is a concave surface;
the seventh positive focal power lens is a biconvex lens, and two surfaces of the seventh positive focal power lens are even aspheric surfaces;
the eighth positive focal power lens is a biconvex lens;
the seventh negative power lens is a meniscus lens, and one surface of the seventh negative power lens facing the object side is a concave surface;
the eighth negative power lens is a meniscus lens, and one surface of the eighth negative power lens facing the object side is a convex surface;
the ninth positive power lens is a meniscus lens, and one surface of the ninth positive power lens facing the object side is a convex surface.
6. The lens barrel according to claim 1, wherein the refractive index of each of the third positive power lens and the sixth positive power lens is 1.9 or more, and the refractive index of the seventh negative power lens is 1.83 or more;
and the abbe numbers of the third negative focal power lens, the fifth positive focal power lens and the seventh positive focal power lens are all more than or equal to 65.
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| CN113589503B (en) * | 2021-07-12 | 2022-05-20 | 浙江大华技术股份有限公司 | Lens barrel |
| CN114442276A (en) * | 2022-01-12 | 2022-05-06 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN114967086B (en) * | 2022-07-28 | 2023-01-06 | 歌尔光学科技有限公司 | Projection lens and projection equipment |
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| JP2006259215A (en) * | 2005-03-17 | 2006-09-28 | Sony Corp | Zoom lens and imaging apparatus |
| JP4982799B2 (en) * | 2007-09-03 | 2012-07-25 | コニカミノルタアドバンストレイヤー株式会社 | Zoom lens |
| JP5752702B2 (en) * | 2010-10-08 | 2015-07-22 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JP2014041195A (en) * | 2012-08-21 | 2014-03-06 | Canon Inc | Zoom lens and imaging apparatus including the same |
| JP5959994B2 (en) * | 2012-08-24 | 2016-08-02 | 株式会社シグマ | Zoom lens system |
| JP2014137524A (en) * | 2013-01-18 | 2014-07-28 | Hoya Corp | Zoom lens system |
| US9915811B2 (en) * | 2013-11-01 | 2018-03-13 | Ricoh Imaging Company, Ltd. | Zoom lens system having first, second, and fourth lens groups which move during zooming |
| CN110187484B (en) * | 2019-05-30 | 2021-06-15 | 浙江大华技术股份有限公司 | Lens |
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