CN111025609A - Lens - Google Patents
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- CN111025609A CN111025609A CN201911244853.9A CN201911244853A CN111025609A CN 111025609 A CN111025609 A CN 111025609A CN 201911244853 A CN201911244853 A CN 201911244853A CN 111025609 A CN111025609 A CN 111025609A
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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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- 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
- G02B15/20—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 an additional movable lens or lens group for varying the objective focal length
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- Optics & Photonics (AREA)
- Lenses (AREA)
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 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< | (f3 f3)/(f2 f4) | < 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. In the embodiment of the present invention, four lens groups are arranged in order from an object side to an image side in a lens barrel in a specific order, positions of the first lens group and the third lens group are fixed, the second lens group and the fourth lens group are movable along an optical axis to realize lens zooming, and the lens groups in the lens barrel satisfy: 1< | (f3 f3)/(f2 f4) | <4, realizing a superstar zoom lens.
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 focal length commonly used in actual construction is 20-40mm, at the moment, the road scene cannot be well matched by using the prime lens. Because no extra-star optical zoom lens which simultaneously meets 3 indexes of aperture value, focal length range, 1.1 inch target surface and the like exists in the market, a zoom lens which meets the three specifications is needed to be developed, the zoom lens is convenient to use on intelligent traffic cameras at home and abroad, and the construction cost at home and abroad is reduced. Therefore, it becomes important to provide a superstar zoom lens.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a super-star 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, 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<|(f3*f3)/(f2*f4)|<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 focal power lens comprises a concave lens, and one surface of the concave 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 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 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 focal power lens comprises a concave lens, and one surface of the concave lens facing the image side is a concave surface;
the third negative power lens comprises a biconcave lens;
the third positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface.
Further, the third lens group includes a fourth positive power lens, a third sub-lens group, a fourth sub-lens group, and a fifth sub-lens group, which are arranged in order from the object side to the image side.
Further, the third sub-lens group includes a fourth 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 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 sixth 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 sixth 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 fifth sub-lens group comprises a seventh 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 curvature radius of one surface of the seventh 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 fourth positive power lens comprises a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the fifth positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface;
the sixth positive power lens includes a biconvex lens;
the fifth negative power lens comprises a biconcave lens;
the seventh positive power lens includes a biconvex lens;
the sixth negative power lens includes a biconcave lens.
Further, the fourth lens group includes an eighth positive power lens, a sixth sub-lens group, and a seventh sub-lens group, which are arranged in order from the object side to the image side.
Further, the sixth sub-lens group includes a ninth positive power lens and a seventh 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 seventh negative focal power lens facing the object side;
the seventh sub-lens group comprises an eighth negative power lens and a tenth 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 tenth positive 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 seventh negative-power lens comprises a concave lens, and one surface of the concave lens facing the object side is a concave surface;
the eighth negative power lens comprises a biconcave lens;
the tenth positive power lens includes a convex lens, and a surface thereof facing the object side is convex.
Further, the refractive indexes of the fourth 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 fifth 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, 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< | (f3 f3)/(f2 f4) | < 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, 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< | (f3 f3)/(f2 f4) | <4, realizing a superstar 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 view of a lens structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a lens barrel after a second lens group and a fourth lens group provided in an embodiment of the present invention are moved;
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 20 mm;
fig. 4 is a graph of transfer function (MTF) of a lens provided in embodiment 1 of the present invention at a focal length end of 40 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 diaphragm 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<|(f3*f3)/(f2*f4)|<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 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.
In the embodiment of the present invention, four lens groups are arranged in order from an object side to an image side in a lens barrel in a specific order, positions of the first lens group and the third lens group are fixed, the second lens group and the fourth lens group are movable along an optical axis to realize lens zooming, and the lens groups in the lens barrel satisfy: 1< | (f3 f3)/(f2 f4) | <4, realizing a superstar zoom lens.
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 focal power lens comprises a concave lens, and one surface of the concave 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 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 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 4 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 third negative power lens 5 and a third positive power lens 6 which are arranged in sequence 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 focal power lens comprises a concave lens, and one surface of the concave lens facing the image side is a concave surface;
the third negative power lens comprises a biconcave lens;
the third positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface.
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 comprises a fourth positive power lens 7, a third sub-lens group, a fourth sub-lens group and a fifth sub-lens group which are arranged in sequence from the object side to the image side.
The third sub-lens group comprises a fourth negative power lens 8 and a fifth positive power lens 9 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 fifth positive focal power lens facing the object side;
the fourth sub-lens group comprises a sixth positive power lens 10 and a fifth negative power lens 11 which are arranged in sequence 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 fifth negative focal power lens facing the object side;
the fifth sub-lens group includes a seventh positive power lens 12 and a sixth negative power lens 13 arranged in order from the object side to the image side; the curvature radius of one surface of the seventh 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 fourth positive power lens comprises a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the fifth positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface;
the sixth positive power lens includes a biconvex lens;
the fifth negative power lens comprises a biconcave lens;
the seventh positive power lens includes a biconvex lens;
the sixth negative power lens includes a biconcave lens.
To further enable the system to be compact, the fourth negative power lens and the fifth positive power lens may be cemented or otherwise snugly connected. The sixth positive power lens and the fifth negative power lens may be cemented or cemented. The seventh positive power lens and the sixth negative 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 14, a sixth sub-lens group and a seventh sub-lens group which are arranged in sequence from the object side to the image side.
The sixth sub-lens group includes a ninth positive power lens 15 and a seventh negative power lens 16 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 seventh negative focal power lens facing the object side;
the seventh sub-lens group includes an eighth negative power lens 17 and a tenth positive power lens 18 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 tenth positive 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 seventh negative-power lens comprises a concave lens, and one surface of the concave lens facing the object side is a concave surface;
the eighth negative power lens comprises a biconcave lens;
the tenth positive power lens includes a convex lens, and a surface thereof facing the object side is convex.
To further enable the system to be compact, the ninth positive power lens and the seventh negative power lens may be cemented or cemented. The eighth negative power lens and the tenth positive power lens may be cemented or adhesively connected.
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 fifth 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 fifth 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 fifth 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 fourth positive focal power lens and the eighth positive focal power lens are both greater than 1.85. And the refractive indexes of the fourth 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 fourth 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 fourth 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: a focal length of 20-40mm, a diaphragm Fno1.3, a field angle 2 omega of 50.5-24 degrees, and an image plane size 2y
The embodiment of the invention realizes the technical requirements of high resolution, super starlight, no thermalization, large target surface and the like, uses one lens to replace several fixed-focus lenses of 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 20-40mm, the aperture Fno is 1.3, and the total lens length TTL is about 108.5 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 | D10 | D22 | D30 |
| 20mm | 0.80 | 20.83 | 3.26 | 10.83 |
| 40mm | 14.05 | 7.57 | 3.64 | 10.46 |
TABLE 2
The data in table 1 and table 2 and the related formulas can be obtained:
the focal length f2 of the second lens group is-24.05; focal length f3 ═ 46.47 of the third lens group; focal length f4 of the fourth lens group is 33.84; l (f3 f3)/(f2 f4) l is 2.66.
The abbe numbers of the first positive focal power lens, the fifth 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 and then moves from right to left, so that the function of changing the focal length of the zoom lens from 20mm to 40mm is realized. Meanwhile, when the object distance is changed, the fourth lens group is moved to implement a focusing function. Fig. 2 is a schematic structural diagram of a lens barrel after a ground second lens group and a fourth lens group provided by an embodiment of the present invention are moved.
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. 3 is a graph of the transfer function (MTF) of the lens at the focal length end of 20mm, with the abscissa being resolution in lp/mm and the ordinate being the MTF value, and similar curves below will not be repeated. As shown in FIG. 3, it can be seen that the curve is smoothly descending and concentrated, and at 100lp/mm, the MTF value within 8.75mm of the y' image height is greater than 0.3; therefore, the performance of the lens can reach 1600 pixels of resolution ratio under white light of the system; fig. 4 is a graph of the transfer function (MTF) of the lens at the 40mm focal length end.
In summary, the embodiments of the present invention provide a lens barrel, which employs 18 zoom lenses including 4 lens groups, and sequentially arranges the zoom lenses from left to right according to a specific sequence, and the structural form of the lens system, the refractive index, abbe number, and other parameters of the lens system are matched with the imaging conditions by distributing the focal power of each optical lens, and simultaneously employing 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 pixels, and having good environmental applicability (from-40 ℃ to 80 ℃).
The focal length of the lens provided by the embodiment of the invention is 20-40mm, the aperture is F1.3, and a fourth lens group focusing mode is utilized; the embodiment of the invention adopts 18-piece type, all optical lenses adopt spherical surface design, the cold processing property is good, and the production cost is low.
For the relation: 1< | (f3 f3)/(f2 f4) | <4, when the value is greater than the upper limit, the imaging performance is improved, but the system volume and cost are rapidly increased without reducing the total length of the system; when the value is less than the lower limit, the system imaging performance will not meet the use requirement of 1600 pixels although the system structure will be more compact.
In order to realize better chromatic aberration elimination and no thermalization (clear imaging can be realized at-40 to 80 ℃), the first positive power lens, the fifth 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, 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< | (f3 f3)/(f2 f4) | < 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, 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< | (f3 f3)/(f2 f4) | <4, realizing a superstar 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. A 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<|(f3*f3)/(f2*f4)|<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.
2. The lens barrel according to claim 1, wherein the first lens group includes a first sub-lens group and a second positive power lens arranged in order from an object side to an image side.
3. The lens barrel according to claim 2, wherein the first sub-lens group includes a first negative power lens and a first positive power lens arranged in order from an object side to an 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 concave lens, and one surface of the concave 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 convex lens, and one surface of the meniscus convex lens facing the object side is a convex surface.
4. The lens barrel according to claim 1, wherein 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.
5. The lens barrel according to claim 4, wherein 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 focal power lens comprises a concave lens, and one surface of the concave lens facing the image side is a concave surface;
the third negative power lens comprises a biconcave lens;
the third positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface.
6. The lens barrel according to claim 3, wherein the third lens group includes a fourth positive power lens, a third sub-lens group, a fourth sub-lens group, and a fifth sub-lens group, which are arranged in order from the object side to the image side.
7. The lens barrel according to claim 6, wherein the third sub-lens group includes a fourth 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 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 sixth 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 sixth 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 fifth sub-lens group comprises a seventh 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 curvature radius of one surface of the seventh 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 fourth positive power lens comprises a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the fifth positive power lens comprises a convex lens, and one surface of the convex lens facing the object side is a convex surface;
the sixth positive power lens includes a biconvex lens;
the fifth negative power lens comprises a biconcave lens;
the seventh positive power lens includes a biconvex lens;
the sixth negative power lens includes a biconcave lens.
8. The lens barrel according to claim 7, wherein the fourth lens group includes an eighth positive power lens, a sixth sub-lens group, and a seventh sub-lens group, which are arranged in order from the object side to the image side.
9. The lens barrel according to claim 8, wherein the sixth sub-lens group includes a ninth positive power lens and a seventh 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 seventh negative focal power lens facing the object side;
the seventh sub-lens group comprises an eighth negative power lens and a tenth 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 tenth positive 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 seventh negative-power lens comprises a concave lens, and one surface of the concave lens facing the object side is a concave surface;
the eighth negative power lens comprises a biconcave lens;
the tenth positive power lens includes a convex lens, and a surface thereof facing the object side is convex.
10. The lens barrel as claimed in claim 9, wherein the refractive index of each of the fourth 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 fifth positive focal power lens and the ninth positive focal power lens are all more than 65.
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| CN114994889A (en) * | 2022-08-02 | 2022-09-02 | 浙江大华技术股份有限公司 | Lens and camera device |
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| CN111025609B (en) | 2022-02-18 |
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