CN110764237B - Lens - Google Patents
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- CN110764237B CN110764237B CN201911184071.0A CN201911184071A CN110764237B CN 110764237 B CN110764237 B CN 110764237B CN 201911184071 A CN201911184071 A CN 201911184071A CN 110764237 B CN110764237 B CN 110764237B
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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
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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, a fifth lens group, an optical filter and an image surface, wherein the first lens group, the second lens group, the diaphragm, the third lens group, the fourth lens group, the fifth lens group, the optical filter and the image surface 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: 0.2< | f3/(f2 f4) | < 0.4; where f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f4 is the focal length of the fourth lens group. The positions of the first lens group, the third lens group and the fifth lens group are fixed, the second lens group and the fourth lens group can move along an optical axis to realize lens zooming, and the lens groups in the lens meet the following requirements: 0.2< | f3/(f2 f4) | <0.4, a starlight level zoom lens is realized.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
In the intelligent transportation industry, because of the perfect industry standard in China, standard 1-inch fixed-focus lenses of 12mm, 16mm, 20mm, 25mm, 30mm, 35mm and the like are often used in actual construction, the actual aperture value is 1.4-1.6, when a certain focal length lens is installed improperly, the lens needs to be replaced, and the use is not very convenient. In addition, for foreign countries, the road standard specification is different from that of China, or some countries have no corresponding standard specification, and the road scene cannot be well matched by using the fixed-focus lens. Since there is no starlight level zoom lens that can satisfy 3 indexes such as aperture value, focal length range and 1.1 inch target surface, it is necessary to develop a zoom lens that can satisfy the three specifications, and it is convenient to use in the intelligent traffic video camera at home and abroad, and reduces the construction cost at home and abroad. Therefore, it becomes important to provide a starlight level zoom lens.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a starlight level zoom lens.
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, a fifth 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 fifth 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, 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:
0.2<|f3/(f2*f4)|<0.4；
where f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f4 is the focal length of the fourth lens group.
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-power lens comprises a meniscus concave lens, and one surface of the meniscus concave lens facing the object side is a convex surface;
the first positive power lens comprises a biconvex lens;
the second positive power lens comprises a meniscus convex lens, and one surface of the meniscus convex lens facing the object side is a convex surface.
Further, the second lens group includes a second negative power lens, a third 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 fourth negative focal power lens, a third positive focal power lens and a fifth negative focal power lens which are sequentially arranged from the object side to the image side;
the curvature radius of one surface of the fourth 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 curvature radius of one surface of the third 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 second negative-power lens comprises a meniscus concave lens, and one surface of the meniscus concave lens facing the object side is a convex surface;
the third negative power lens comprises a biconcave lens;
the fourth negative power lens comprises a biconcave lens;
the third positive power lens comprises a biconvex lens;
the fifth negative power lens includes a biconcave lens.
Further, the third lens group includes a third sub-lens group, a sixth positive power lens, a fourth sub-lens group, and an eighth negative power lens arranged in order from the object side to the image side.
Further, the third sub-lens group includes a fourth positive power lens, a sixth negative power lens and a fifth positive power lens arranged in order from the object side to the image side; the curvature radius of one surface of the fourth 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 curvature radius of one surface of the sixth negative focal power lens facing the image side is the same as that of one surface of the fifth positive focal power lens facing the object side;
the fourth sub-lens group comprises a seventh negative focal power lens and a seventh positive focal power lens which are arranged in sequence from the object side to the image side; the curvature radius of one surface of the seventh negative focal power lens facing the image side is the same as that of one surface of the seventh positive focal power lens facing the object side;
the fourth positive focal power lens comprises a convex lens, and one surface of the convex lens facing the image side is a convex surface;
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 fifth positive focal power lens comprises a convex lens, and one surface of the convex lens facing the image side is a convex surface;
the sixth positive power lens comprises a meniscus convex lens, and one surface of the meniscus convex lens facing the object side is a convex surface;
the seventh negative power lens comprises a biconcave lens;
the seventh positive power lens comprises a meniscus convex lens, and one surface of the meniscus convex lens facing the object side is a convex surface;
the eighth negative power lens includes a biconcave lens.
Further, the fourth lens group includes an eighth positive power lens and a fifth sub-lens group arranged in order from the object side to the image side.
Further, the fifth sub-lens group includes a ninth positive power lens and a ninth negative power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the ninth positive focal power lens facing the image side is the same as that of one surface of the ninth negative focal power lens facing the object side;
the eighth positive power lens includes a biconvex lens;
the ninth positive power lens includes a biconvex lens;
the ninth negative power lens includes a biconcave lens.
Further, the fifth lens group includes a tenth positive power lens and a tenth negative power lens arranged in order from the object side to the image side;
the curvature radius of one surface of the tenth positive focal power lens facing the image side is the same as that of one surface of the tenth negative focal power lens facing the object side;
the tenth positive power lens includes a biconvex lens;
the tenth negative power lens includes a concave lens, and a surface thereof facing the object side is concave.
Further, the refractive indexes of the sixth positive power lens and the eighth positive power lens are both greater than 1.85;
the abbe numbers of the first positive focal power lens, the fourth positive focal power lens and the ninth positive focal power lens are all more than 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, a fifth 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 fifth 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, 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: 0.2< | f3/(f2 f4) | < 0.4; where f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f4 is the focal length of the fourth lens group. Since in the embodiment of the present invention, five 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, the third lens group, and the fifth lens group are fixed, the second lens group and the fourth lens group are movable along the optical axis to achieve lens zooming, and the lens groups in the lens barrel satisfy: 0.2< | f3/(f2 f4) | <0.4, a starlight level zoom lens is realized.
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 view of a lens structure according to an embodiment of the present invention;
fig. 2 is a graph of a transfer function (MTF) of a lens provided in embodiment 1 of the present invention at a focal length end of 13 mm;
fig. 3 is a graph of a transfer function (MTF) of a lens provided in embodiment 1 of the present invention at a focal length end of 33 mm;
fig. 4 is a graph of transfer function (MTF) of the lens provided in embodiment 2 of the present invention at the focal length end of 13 mm;
fig. 5 is a graph of transfer function (MTF) of the lens provided in embodiment 2 of the present invention at the focal length end of 33 mm.
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 disclosure, where the lens barrel includes a first lens group G1, a second lens group G2, a stop P, a third lens group G3, a fourth lens group G4, a fifth lens group G5, an optical filter N, and an image plane M, which are arranged in this order 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:
0.2<|f3/(f2*f4)|<0.4；
where f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f4 is the focal length of the fourth lens group.
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 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 fifth lens group. The fourth lens group may be close to the third lens group, distant from the fifth lens group; it may be further from the third lens group and closer to the fifth lens group. 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.
Because five lens groups are arranged in the lens from the object side to the image side in sequence according to a specific sequence, the positions of the first lens group, the third lens group and the fifth lens group are fixed, the second lens group and the fourth lens group can move along the optical axis to realize the zooming of the lens, and the lens groups in the lens meet the following conditions: 0.2< | f3/(f2 f4) | <0.4, a starlight level zoom lens is realized.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the first lens group comprises a first sub-lens group and a second positive power lens 3 which are arranged in sequence from the object side to the image side.
The first sub-lens group comprises a first negative focal power lens 1 and a first positive focal power lens 2 which are arranged in sequence 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-power lens comprises a meniscus concave lens, and one surface of the meniscus concave lens facing the object side is a convex surface;
the first positive power lens comprises a biconvex lens;
the second positive power lens comprises a meniscus convex lens, and one surface of the meniscus convex lens facing the object side is a convex surface.
To further enable the system to be compact, the first negative power lens 1 and the first positive power lens 2 may be cemented or cemented.
In order to further improve the imaging quality of the lens, in the embodiment of the invention, the second lens group comprises a second negative power lens 4, a third negative power lens 5 and a second sub-lens group which are arranged in sequence from the object side to the image side;
the second sub-lens group comprises a fourth negative focal power lens 6, a third positive focal power lens 7 and a fifth negative focal power lens 8 which are arranged in sequence from the object side to the image side;
the curvature radius of one surface of the fourth 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 curvature radius of one surface of the third 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 second negative-power lens comprises a meniscus concave lens, and one surface of the meniscus concave lens facing the object side is a convex surface;
the third negative power lens comprises a biconcave lens;
the fourth negative power lens comprises a biconcave lens;
the third positive power lens comprises a biconvex lens;
the fifth negative power lens includes a biconcave lens.
To further enable the system to be compact, the fourth negative power lens, the third positive power lens and the fifth negative 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 third sub-lens group, a sixth positive power lens 12, a fourth sub-lens group and an eighth negative power lens 15 which are arranged in order from the object side to the image side.
The third sub-lens group comprises a fourth positive focal power lens 9, a sixth negative focal power lens 10 and a fifth positive focal power lens 11 which are arranged in sequence from the object side to the image side; the curvature radius of one surface of the fourth 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 curvature radius of one surface of the sixth negative focal power lens facing the image side is the same as that of one surface of the fifth positive focal power lens facing the object side;
the fourth sub-lens group includes a seventh negative power lens 13 and a seventh positive power lens 14 arranged in order from the object side to the image side; the curvature radius of one surface of the seventh negative focal power lens facing the image side is the same as that of one surface of the seventh positive focal power lens facing the object side;
the fourth positive focal power lens comprises a convex lens, and one surface of the convex lens facing the image side is a convex surface;
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 fifth positive focal power lens comprises a convex lens, and one surface of the convex lens facing the image side is a convex surface;
the sixth positive power lens comprises a meniscus convex lens, and one surface of the meniscus convex lens facing the object side is a convex surface;
the seventh negative power lens comprises a biconcave lens;
the seventh positive power lens comprises a meniscus convex lens, and one surface of the meniscus convex lens facing the object side is a convex surface;
the eighth negative power lens includes a biconcave lens.
To further enable the system to be compact, the fourth positive power lens, the sixth negative power lens and the fifth positive power lens may be cemented or otherwise snugly connected. The seventh negative power lens and the seventh positive power lens may be cemented or adhesively connected.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the fourth lens group comprises an eighth positive power lens 16 and a fifth sub-lens group which are arranged in sequence from the object side to the image side.
The fifth sub-lens group includes a ninth positive power lens 17 and a ninth negative power lens 18 arranged in order from the object side to the image side;
the curvature radius of one surface of the ninth positive focal power lens facing the image side is the same as that of one surface of the ninth negative focal power lens facing the object side;
the eighth positive power lens includes a biconvex lens;
the ninth positive power lens includes a biconvex lens;
the ninth negative power lens includes a biconcave lens.
To further enable the system to be compact, the ninth positive power lens and the ninth 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 present invention, the fifth lens group includes a tenth positive power lens 19 and a tenth negative power lens 20 arranged in order from the object side to the image side;
the curvature radius of one surface of the tenth positive focal power lens facing the image side is the same as that of one surface of the tenth negative focal power lens facing the object side;
the tenth positive power lens includes a biconvex lens;
the tenth negative power lens includes a concave lens, and a surface thereof facing the object side is concave.
To further enable the system to be compact, the tenth positive power lens and the tenth negative power lens may be cemented or cemented.
In the embodiment of the invention, in order to realize clear imaging at the lens from-40 ℃ to 80 ℃, the abbe numbers of the first positive power lens, the fourth positive power lens and the ninth positive power lens are all more than 65. In addition, the abbe numbers of the first positive focal power lens, the fourth positive focal power lens and the ninth positive focal power lens are all larger than 65, and the chromatic aberration of the image can be reduced, so that the imaging quality is improved. The abbe numbers of the first positive power lens, the fourth positive power lens and the ninth 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 sixth positive focal power lens and the eighth positive focal power lens are both greater than 1.85. And the refractive indexes of the sixth positive focal power lens and the eighth positive focal power lens are both larger than 1.85, so that the spherical aberration can be reduced, and the imaging quality is improved. The refractive indexes of the sixth positive power lens and the eighth positive power lens can be the same or different.
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 fifth lens group and the image surface, and the optical filter is an optical device for selecting a required radiation waveband.
The optical performance of the lens provided by the embodiment of the invention is as follows: focal length is about 13-33mm, aperture Fno1.3, field angle 2 omega range is about 72 degrees to 32 degrees, and image plane size 2 y' is
The embodiment of the invention realizes the technical requirements of high resolution, starlight, no thermalization, large target surface and the like, uses one lens to replace several fixed focus lenses of 12mm, 16mm, 20mm, 25mm, 30mm, 35mm and the like commonly used by intelligent transportation, and is convenient to install and use in engineering.
The following exemplifies the lens parameters provided by the embodiment of the present invention.
Example 1:
the focal length of the lens is 13-33mm, the aperture Fno is 1.3, and the total lens length TTL is about 137.5 mm.
Data of curvature radius, center thickness, refractive index nd, and abbe constant Vd of each lens are shown in table 1:
TABLE 1
Wherein, the variable thickness data is as shown in table 2:
| focal length of system | D5 | D13 | D25 | D30 |
| 13mm | 0.87 | 29.90 | 5.47 | 0.57 |
| 33mm | 26.95 | 3.82 | 2.09 | 3.95 |
TABLE 2
The data in table 1 and table 2 and the related formulas can be obtained:
focal length f2 of the second lens group is-25.13; focal length f3 of the third lens group is 148.76; focal length f4 of the fourth lens group is 21.48; i f3/(f2 f4) | 0.27.
The abbe numbers of the first positive focal power lens, the fourth positive focal power lens and the ninth positive focal power lens are all 68.62.
When the second lens group moves linearly to the right, the corresponding fourth lens group moves from the right to the left, so that the function of changing the focal length of the zoom lens from 13mm to 33mm is realized. Meanwhile, when the object distance is changed, the fourth lens group is moved to implement a focusing function.
The lens provided in embodiment 1 will be further described below by performing detailed optical system analysis on embodiment 1.
The optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, and the higher and smoother curve of the optical transfer function indicates that the imaging quality of the system is better, and aberration is well corrected.
FIG. 2 is a plot of the transfer function (MTF) of the system at the 13mm focal length end, with resolution on the abscissa and lp/mm on the ordinate, and MTF values on the ordinate, similar curves below are not repeated. As in fig. 2, it can be seen that the curve falls smoothly and converges. At 100lp/mm, the MTF value is greater than 0.3 within 8.8mm of the y' image height. Therefore, the performance of the lens of the system can reach the resolution of 1600 ten thousand pixels under white light. Fig. 3 is a graph of the transfer function (MTF) of the system at the 33mm focal length end.
Example 2:
the focal length of the lens is 13-33mm, the aperture Fno is 1.3, and the total lens length TTL is 137.5 mm.
Data of the radius of curvature, center thickness, refractive index nd, and abbe constant Vd of each lens are shown in table 3:
TABLE 3
Wherein, the variable thickness data is as shown in table 4:
| focal length of system | D5 | D12 | D22 | D31 |
| 13mm | 1.07 | 31.29 | 5.46 | 2.29 |
| 33mm | 28.01 | 4.35 | 2.26 | 5.49 |
TABLE 4
According to the data in table 3 and table 4 and the related formulas, the following can be obtained:
focal length f2 ═ 26.15 for the second lens group; focal length f3 of the third lens group is 199.47; focal length f4 of the fourth lens group is 20.57; i f3/(f2 f4) | 0.37.
The abbe numbers of the first positive focal power lens, the fourth positive focal power lens and the ninth positive focal power lens are all 68.62.
When the second lens group moves linearly to the right, the corresponding fourth lens group moves from left to right, so that the function of changing the focal length of the zoom lens from 13mm to 33mm is realized. Meanwhile, when the object distance changes, the fourth lens group is moved to realize the focusing function.
The lens provided in embodiment 2 will be further described below by performing a detailed optical system analysis on embodiment 2.
Fig. 4 is a graph of the transfer function (MTF) of the system at the 13mm focal length end. As can be seen, the curve falls smoothly and converges. At 100lp/mm, the MTF value is greater than 0.3 within 8.8mm of the y' image height. Therefore, the performance of the lens of the system can reach the resolution of 1600 ten thousand pixels under white light. Fig. 5 is a graph of the transfer function (MTF) of the system at the 33mm focal length end.
In summary, the embodiments of the present invention provide a lens, which adopts 20 zoom lenses in 5 groups, and sequentially arranges the zoom lenses from left to right according to a specific sequence, and matches the structural form of the lens system, the refractive index, abbe number, and other parameters of the lens with the imaging conditions by distributing the focal power of each optical lens, and simultaneously adopting a reasonable optical glass material, so as to better correct the spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification, and chromatic aberration of position of the lens system, thereby achieving a resolution of 1600 ten thousand pixels, and having good environmental suitability (from-40 ℃ to 80 ℃).
The focal length of the lens provided by the embodiment of the invention is 13-33mm, the aperture is F1.3, and a focusing mode of the fourth lens group is utilized. The 20-piece type is adopted, all the optical lenses adopt spherical surface design, the cold machining process performance is good, and the production cost is low.
For the relation: 0.2< | f3/(f2 f4) | <0.4, and when the value is larger than the upper limit, the imaging performance is improved, but the system volume and cost are rapidly increased, and the total length of the system is not reduced; when the value is less than the lower limit, although the system structure is more compact, the imaging performance of the system is poor, and the use requirement of 1600 ten thousand pixels can not be met.
In order to realize better chromatic aberration elimination and athermalization (clear imaging at-40 ℃ to 80 ℃), the first positive power lens, the fourth positive power lens and the ninth positive power lens adopt low-dispersion materials, and the Abbe numbers are all larger than 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, a fifth 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 fifth 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, 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: 0.2< | f3/(f2 f4) | < 0.4; where f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f4 is the focal length of the fourth lens group. Since in the embodiment of the present invention, five 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, the third lens group, and the fifth lens group are fixed, the second lens group and the fourth lens group are movable along the optical axis to achieve lens zooming, and the lens groups in the lens barrel satisfy: 0.2< | f3/(f2 f4) | <0.4, a starlight level zoom lens is realized.
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. A lens is characterized in that the lens consists of a first lens group, a second lens group, a diaphragm, a third lens group, a fourth lens group, a fifth 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, 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:
0.2<|f3/(f2*f4)|<0.4；
wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, and f4 is the focal length of the fourth lens group;
wherein the first lens group has a positive focal length, the second lens group has a negative focal length, the third lens group has a positive focal length, the fourth lens group has a positive focal length, and the fifth lens group has a positive focal length;
the second lens group consists of a second negative focal power lens, a third negative focal 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 consists of a fourth negative focal power lens, a third 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 curvature radius of one surface of the fourth 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 curvature radius of one surface of the third 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 second negative focal power lens is a meniscus concave lens, and one surface of the second negative focal power lens facing the object side is a convex surface;
the third negative focal power lens is a biconcave lens;
the fourth negative focal power lens is a biconcave lens;
the third positive focal power lens is a biconvex lens;
the fifth negative focal power lens is a biconcave lens;
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 third lens group consists of a third sub-lens group, a sixth positive focal power lens, a fourth sub-lens group and an eighth negative focal power lens which are arranged in sequence from the object side to the image side;
the third sub-lens group consists of a fourth positive focal power lens, a sixth negative focal power lens and a fifth positive focal power lens which are arranged in sequence from the object side to the image side;
the fourth sub-lens group is composed of a seventh negative focal power lens and a seventh positive focal power lens which are sequentially arranged from the object side to the image side;
the fourth lens group consists of an eighth positive power lens and a fifth sub-lens group which are arranged in sequence from the object side to the image side;
the fifth sub-lens group is composed of a ninth positive focal power lens and a ninth negative focal power lens which are arranged in sequence from the object side to the image side;
the fifth lens group is composed of a tenth positive power lens and a tenth negative power lens 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 concave lens, and one surface of the first negative focal power lens facing the object side is a convex surface;
the first positive focal power lens is a biconvex lens;
the second positive power lens is a meniscus 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 fourth 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 sixth negative focal power lens facing the image side is the same as that of one surface of the fifth positive focal power lens facing the object side;
the curvature radius of one surface of the seventh negative focal power lens facing the image side is the same as that of one surface of the seventh positive focal power lens facing the object side;
the fourth positive focal power lens is a convex lens, and one surface of the fourth positive focal power lens facing the image side is a convex surface;
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 fifth positive focal power lens is a convex lens, and one surface of the fifth positive focal power lens facing the image side is a convex surface;
the sixth positive focal power lens is a meniscus convex lens, and one surface of the sixth positive focal power lens facing the object side is a convex surface;
the seventh negative focal power lens is a biconcave lens;
the seventh positive power lens is a meniscus convex lens, and one surface of the seventh positive power lens facing the object side is a convex surface;
the eighth negative power lens is a biconcave lens.
4. The lens barrel according to claim 1, wherein a surface of the ninth positive power lens facing the image side and a surface of the ninth negative power lens facing the object side have the same radius of curvature;
the eighth positive focal power lens is a biconvex lens;
the ninth positive focal power lens is a biconvex lens;
the ninth negative power lens is a biconcave lens.
5. The lens barrel according to claim 1, wherein a surface of the tenth positive power lens facing the image side and a surface of the tenth negative power lens facing the object side have the same radius of curvature;
the tenth positive power lens is a biconvex lens;
the tenth negative power lens is a concave lens, and one surface of the tenth negative power lens facing the object side is a concave surface.
6. The lens barrel as claimed in claim 1, wherein the refractive index of each of the sixth positive power lens and the eighth positive power lens is greater than 1.85;
the abbe numbers of the first positive focal power lens, the fourth positive focal power lens and the ninth positive focal power lens are all more than 65.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US12352937B2 (en) | 2020-03-20 | 2025-07-08 | Huawei Technologies Co., Ltd. | Zoom lens, camera module, and terminal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113296250B (en) * | 2021-05-14 | 2022-08-23 | 嘉兴中润光学科技股份有限公司 | Zoom lens and imaging device |
| CN113296251B (en) * | 2021-05-14 | 2022-10-14 | 嘉兴中润光学科技股份有限公司 | Zoom lens and imaging device |
| CN115079379B (en) * | 2022-06-17 | 2023-07-04 | 湖南长步道光学科技有限公司 | Visible-near infrared optical system and optical lens |
| CN114994887B (en) * | 2022-07-25 | 2022-10-21 | 浙江大华技术股份有限公司 | Lens and camera device |
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| JP2008170874A (en) * | 2007-01-15 | 2008-07-24 | Sony Corp | Zoom lens and imaging device |
| US8730587B2 (en) * | 2011-06-08 | 2014-05-20 | Olympus Corporation | Zoom lens and image pickup apparatus using the same |
| JP2017134302A (en) * | 2016-01-29 | 2017-08-03 | キヤノン株式会社 | Zoom lens and imaging device having the same |
| JP7046535B2 (en) * | 2017-09-11 | 2022-04-04 | キヤノン株式会社 | Zoom lens and image pickup device with it |
| JP2019066694A (en) * | 2017-10-02 | 2019-04-25 | オリンパス株式会社 | Zoom optical system and image capturing device having the same |
| 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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| US12352937B2 (en) | 2020-03-20 | 2025-07-08 | Huawei Technologies Co., Ltd. | Zoom lens, camera module, and terminal device |
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