CN110579861B - Lens - Google Patents
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- CN110579861B CN110579861B CN201910866277.5A CN201910866277A CN110579861B CN 110579861 B CN110579861 B CN 110579861B CN 201910866277 A CN201910866277 A CN 201910866277A CN 110579861 B CN110579861 B CN 110579861B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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Abstract
The invention discloses a lens, which comprises a first positive focal power lens, a first lens group, a second lens group, an aperture diaphragm, a fifth positive focal power lens, a sixth positive focal power lens, a third lens group, an optical filter and an imaging surface, wherein the first positive focal power lens, the first lens group, the second lens group, the aperture diaphragm, the fifth positive focal power lens, the sixth positive focal power lens, the third lens group, the optical filter and the imaging surface are sequentially arranged from an object side to an image side; the lens group satisfies the following conditions: f 1/f' is not less than 5.9 and not more than-3.9; f 2/f' is not less than 0.92 and not more than-0.52; f 3/f' is not less than 1.4 and not more than-0.8; BFL/f' is not less than 0.3; wherein f1 is a focal length of the first lens group, f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f' is a system focal length of the lens barrel, and BFL is a distance between the third lens group and the imaging surface. The lens provided by the embodiment of the invention is a lens with large magnification, large aperture and high resolution.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
With social progress, the requirements of people on video monitoring cameras are increasing day by day, the cameras are required to be capable of imaging clearly in an environment with sufficient light, and also required to be capable of imaging clearly in an environment with insufficient light, so that the performance requirements of the camera lens in a low-illumination environment are higher and higher.
At present, the technology of the image sensor is continuously improved, and the light sensing performance of the image sensor is better and better, so that a corresponding lens is required to be adapted to the image sensor. However, most of the existing lens apertures on the market are about F2.0, and under the circumstance of low ambient illumination at night, the license plate, especially the face in the vehicle, cannot be accurately identified, if the license plate is to be identified, the brightness of the supplementary lighting needs to be increased, but when the brightness is too high, the eyes of the driver are easily stimulated greatly, and dangerous accidents are easily caused. In addition, the resolution and the magnification of the lens on the market are low, and the quality of the acquired image is poor. Therefore, it is important to develop a lens with large magnification, large aperture and high resolution.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for solving the problems of small lens multiplying power, small aperture and low resolution in the prior art.
The embodiment of the present invention provides a lens assembly, which includes a first positive power lens, a first lens group, a second lens group, an aperture stop, a fifth positive power lens, a sixth positive power lens, a third lens group, an optical filter, and an image plane, which are sequentially arranged from an object side to an image side;
the lens group satisfies the following conditions:
-5.9≤f1/f’≤-3.9；
-0.92≤f2/f’≤-0.52；
-1.4≤f3/f’≤-0.8；
BFL/f’≥0.3；
wherein f1 is a focal length of the first lens group, f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f' is a system focal length of the lens barrel, and BFL is a distance between the third lens group and the imaging surface.
Further, the first lens group includes at least a second positive power lens and a first negative power lens.
Further, the first lens group comprises a second positive focal power lens, a first negative focal power lens and a third positive focal power lens which are arranged in sequence from the object side to the image side;
the curvature radius of the surface of the second positive power lens facing the image side is the same as that of the surface of the first negative power lens facing the object side.
Further, the second positive power lens is a convex lens, and the surface of the second positive power lens facing the object side is a convex surface;
the first negative focal power lens is a concave lens, and the surface of the first negative focal power lens facing the image side is a concave surface;
the third positive power lens is a convex lens, and the surface of the third positive power lens facing the object side is a convex surface.
Further, the second lens group comprises a second negative power lens and a fourth positive power lens which are arranged in sequence from the object side to the image side;
the surface of the second negative power lens facing the image side and the surface of the fourth positive power lens facing the object side have the same curvature radius.
Further, the second negative power lens is a biconcave lens;
the fourth positive power lens is a meniscus lens, and the surface of the fourth positive power lens facing the object side is a convex surface.
Further, the third lens group includes a seventh positive power lens and a third negative power lens arranged in order from the object side to the image side;
the curvature radius of the surface of the seventh positive power lens facing the image side is the same as that of the surface of the third negative power lens facing the object side.
Further, the seventh positive power lens is a convex lens, and a surface thereof facing the object side is a convex surface;
the third negative-power lens is a concave lens, and the surface of the third negative-power lens facing the image side is a concave surface.
Further, the abbe numbers of the fourth positive power lens, the fifth positive power lens and the seventh positive power lens are all more than or equal to 65.
Further, the refractive index of each of the sixth positive power lens and the third negative power lens is 1.9 or more.
The embodiment of the present invention provides a lens assembly, which includes a first positive power lens, a first lens group, a second lens group, an aperture stop, a fifth positive power lens, a sixth positive power lens, a third lens group, an optical filter, and an image plane, which are sequentially arranged from an object side to an image side; the lens group satisfies the following conditions: f 1/f' is not less than 5.9 and not more than-3.9; f 2/f' is not less than 0.92 and not more than-0.52; f 3/f' is not less than 1.4 and not more than-0.8; BFL/f' is not less than 0.3; wherein f1 is a focal length of the first lens group, f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f' is a system focal length of the lens barrel, and BFL is a distance between the third lens group and the imaging surface.
Since, in the embodiment of the present invention, lenses are arranged in order from the object side to the image side in the lens barrel in a specific order, and the lens groups in the lens barrel satisfy: f 1/f' is not less than 5.9 and not more than-3.9; f 2/f' is not less than 0.92 and not more than-0.52; f 3/f' is not less than 1.4 and not more than-0.8; BFL/f' is not less than 0.3; therefore, the lens provided by the embodiment of the invention is a lens with large magnification, large aperture and high resolution.
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 an optical transfer function (MTF) of the lens provided in the embodiment of the present invention in a normal temperature state of a visible light band;
fig. 3 is a graph of an optical transfer function (MTF) of the lens provided in the embodiment of the present invention in a visible light band-30 ℃;
fig. 4 is a graph of an optical transfer function (MTF) of the lens provided in the embodiment of the present invention in a state of a visible light band +70 ℃.
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 invention, the lens barrel includes, in order from an object side to an image side, a first positive power lens L1, a first lens group G1, a second lens group G2, an aperture stop P, a fifth positive power lens L7, a sixth positive power lens L8, a third lens group G3, a filter M, and an image plane N;
the lens group satisfies the following conditions:
-5.9≤f1/f’≤-3.9；
-0.92≤f2/f’≤-0.52；
-1.4≤f3/f’≤-0.8；
BFL/f’≥0.3；
wherein f1 is a focal length of the first lens group, f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f' is a system focal length of the lens barrel, and BFL is a distance between the third lens group and the imaging surface.
In the lens provided by the embodiment of the invention, each lens group has a corresponding focal length f, and the system focal length of the lens is f'. In order to provide a large-power, large-aperture, high-resolution lens barrel, the lens group satisfies the following relation:
-5.9≤f1/f’≤-3.9；
-0.92≤f2/f’≤-0.52；
-1.4≤f3/f’≤-0.8；
BFL/f’≥0.3；
wherein f1 is a focal length of the first lens group, f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f' is a system focal length of the lens barrel, and BFL is a distance between the third lens group and the imaging surface.
In the embodiment of the invention, an aperture diaphragm is arranged between the second lens group and the fifth positive power lens, 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 arranged 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 a filter is arranged between the third lens group and the imaging surface. Filters are optical devices used to select a desired wavelength band of radiation.
Since, in the embodiment of the present invention, lenses are arranged in order from the object side to the image side in the lens barrel in a specific order, and the lens groups in the lens barrel satisfy: f 1/f' is not less than 5.9 and not more than-3.9; f 2/f' is not less than 0.92 and not more than-0.52; f 3/f' is not less than 1.4 and not more than-0.8; BFL/f' is not less than 0.3; therefore, the lens provided by the embodiment of the invention is a lens with large magnification, large aperture and high resolution.
In order to improve the imaging quality of the lens, the first lens group at least comprises a second positive power lens L2 and a first negative power lens L3.
The first lens group may include only two lenses, i.e., the second positive power lens L2 and the first negative power lens L3, or may include other lenses besides the two lenses, and preferably, the first lens group includes a second positive power lens, a first negative power lens and a third positive power lens L4 arranged in order from the object side to the image side.
In order to make the system compact, the curvature radius of the surface of the second positive power lens facing the image side is the same as that of the surface of the first negative power lens facing the object side, and the second positive power lens and the first negative power lens can be connected in a fitting manner, preferably, can be connected in a gluing manner.
Specifically, in order to further improve the imaging quality of the lens, the second positive power lens is a convex lens, and the surface of the second positive power lens facing the object side is a convex surface; the first negative focal power lens is a concave lens, and the surface of the first negative focal power lens facing the image side is a concave surface; the third positive power lens is a convex lens, and the surface of the third positive power lens facing the object side is a convex surface.
The second lens group includes a second negative power lens L5 and a fourth positive power lens L6 arranged in order from the object side to the image side.
In order to enable the system to be compact, the radius of curvature of the surface of the second negative power lens facing the image side is the same as the radius of curvature of the surface of the fourth positive power lens facing the object side. The second negative focal power lens and the fourth positive focal power lens can be jointed, preferably can be connected in a gluing mode.
The second negative focal power lens is a biconcave lens; the fourth positive power lens is a meniscus lens, and the surface of the fourth positive power lens facing the object side is a convex surface.
The third lens group includes a seventh positive power lens L9 and a third negative power lens L10 arranged in order from the object side to the image side.
In order to enable the system to be compact, the curvature radius of the surface of the seventh positive power lens facing the image side is the same as that of the surface of the third negative power lens facing the object side. The seventh positive power lens and the third negative power lens may be attached, preferably, may be bonded.
The seventh positive power lens is a convex lens, and the surface of the seventh positive power lens facing the object side is a convex surface; the third negative-power lens is a concave lens, and the surface of the third negative-power lens facing the image side is a concave surface.
In order to improve the refractive index of the lens and reduce the total length of the lens, the refractive index of each of the sixth positive focal power lens and the third negative focal power lens is greater than or equal to 1.9. For example, the refractive index of the sixth positive power lens may be 2.0, 2.1, etc., the refractive index of the third negative power lens may be 1.9, 2.0, etc., and the refractive indices of the sixth positive power lens and the third negative power lens may be the same or different.
In addition, when light rays of a spherical lens enter the lens and then reach a focal plane, serious refraction and bending are easy to occur at the edge part of the spherical lens than at the central part of the spherical lens, and the phenomenon can cause the reduction of sharpness and contrast and the generation of light spots, thereby causing the reduction of image quality. And such aberrations are called spherical aberrations. In the embodiment of the invention, the refractive indexes of the sixth positive power lens and the third negative power lens are both more than or equal to 1.9, so that the spherical aberration can be reduced, and the image quality can be improved.
The sixth positive focal power lens and the third negative focal power lens are made of ultrahigh refractive index materials, so that the refractive index of the lens can be improved, and the resolution of the lens is further improved. Moreover, by adopting the ultrahigh-refractive-index material, the thicknesses of the sixth positive focal power lens and the third negative focal power lens can be reduced, and the total length of the lens is further reduced.
In order to realize day and night confocal and athermalization in the full focal section of the lens and enable clear imaging, in the embodiment of the invention, the abbe numbers of the fourth positive focal power lens, the fifth positive focal power lens and the seventh positive focal power lens are all more than or equal to 65. In addition, the abbe numbers of the fourth positive focal power lens, the fifth positive focal power lens and the seventh positive focal power lens are all larger than or equal to 65, so that the chromatic aberration of an image can be reduced, and the image quality is improved. The abbe numbers of the fourth positive focal power lens, the fifth positive focal power lens and the seventh positive focal power lens can be the same or different.
In summary, the embodiments of the present invention provide a long focal length optical lens with an ultra-large target surface, ultra-starlight and high resolution. Adopting 10 optical lenses with specific structural shapes, 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 optical 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 extra-starlight and the 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, especially the field of intelligent transportation and road monitoring.
The aperture of the lens provided by the embodiment of the invention reaches F1.3, the imaging brightness and definition are better under a low-light environment at night, the dependence on the brightness of a light supplement lamp when the face of a person in a vehicle is greatly reduced, and the feasibility of eliminating night flashing is realized. The imaging plane size can meet the requirement of 1.1' sensor. The temperature compensation design is carried out in the optical design stage, so that the imaging definition of the lens is hardly reduced in the environment of-30 ℃ to +70 ℃. Under the condition that the MTF value of the whole view field is 100lp/mm, the average value reaches about 0.6, and the requirement of the current 1200-ten-thousand-pixel camera on resolution can be well met.
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 imaging system satisfy the conditions listed in table 1:
TABLE 1
Note that the surface numbers in table 1 are surface numbers of the lenses from left to right in the lens configuration diagram shown in fig. 1.
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 115 mm;
focal length f' of the lens: 70 mm;
angle of view of lens: 14.4 degrees;
optical distortion of the lens: -0.57%;
aperture fno of lens system: f1.3;
size of a lens image plane: 1.1' (≧ phi 17.6 mm).
The imaging system provided by the present embodiment will be further described by analyzing the embodiments in detail.
The optical transfer function is used for evaluating the imaging quality of an imaging system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
As shown in fig. 2, it is a graph of an optical transfer function (MTF) of the lens in a normal temperature state in a visible light band; as shown in fig. 3, which is a graph of the optical transfer function (MTF) of the lens in the visible band-30 ℃; as shown in fig. 4, a graph of the optical transfer function (MTF) of the lens in the visible band +70 ℃. As can be seen from fig. 2 to 4, the optical transfer function (MTF) graph of the imaging system in the normal temperature state in the visible light portion is smooth and concentrated, and the average MTF value of the full field of view (half image height Y' is 8.8mm) reaches about 0.65; 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, at-30 ℃ and +70 ℃, the 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 the full field of view (the half-image height Y' is 8.8mm) reaches about 0.6, so that the high imaging quality can be still kept, the lens is ensured to be suitable for the complex environment, and all-weather high-definition video monitoring is realized.
The embodiment of the present invention provides a lens assembly, which includes a first positive power lens, a first lens group, a second lens group, an aperture stop, a fifth positive power lens, a sixth positive power lens, a third lens group, an optical filter, and an image plane, which are sequentially arranged from an object side to an image side; the lens group satisfies the following conditions: f 1/f' is not less than 5.9 and not more than-3.9; f 2/f' is not less than 0.92 and not more than-0.52; f 3/f' is not less than 1.4 and not more than-0.8; BFL/f' is not less than 0.3; wherein f1 is a focal length of the first lens group, f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f' is a system focal length of the lens barrel, and BFL is a distance between the third lens group and the imaging surface.
Since, in the embodiment of the present invention, lenses are arranged in order from the object side to the image side in the lens barrel in a specific order, and the lens groups in the lens barrel satisfy: f 1/f' is not less than 5.9 and not more than-3.9; f 2/f' is not less than 0.92 and not more than-0.52; f 3/f' is not less than 1.4 and not more than-0.8; BFL/f' is not less than 0.3; therefore, the lens provided by the embodiment of the invention is a lens with large magnification, large aperture and high resolution.
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 (9)
1. The lens is characterized by comprising a first positive power lens, a first lens group, a second lens group, an aperture diaphragm, a fifth positive power lens, a sixth positive power lens, a third lens group, an optical filter and an imaging surface which are sequentially arranged from an object side to an image side;
the lens group satisfies the following conditions:
-5.9≤f1/f’≤-3.9；
-0.92≤f2/f’≤-0.52；
-1.4≤f3/f’≤-0.8；
BFL/f’≥0.3；
wherein f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, f3 is the focal length of the third lens group, f' is the system focal length of the lens, and BFL is the distance between the third lens group and the imaging surface;
the first lens group at least comprises a second positive focal power lens and a first negative focal power lens;
the second lens group consists of a second negative focal power lens and a fourth positive focal power lens which are sequentially arranged from the object side to the image side;
the third lens group consists of a seventh positive focal power lens and a third negative focal power lens which are sequentially arranged from the object side to the image side.
2. The lens barrel according to claim 1, wherein the first lens group is composed of a second positive power lens, a first negative power lens, and a third positive power lens arranged in order from an object side to an image side;
the curvature radius of the surface of the second positive power lens facing the image side is the same as that of the surface of the first negative power lens facing the object side.
3. The lens barrel as claimed in claim 2, wherein the second positive power lens is a convex lens whose surface facing the object side is a convex surface;
the first negative focal power lens is a concave lens, and the surface of the first negative focal power lens facing the image side is a concave surface;
the third positive power lens is a convex lens, and the surface of the third positive power lens facing the object side is a convex surface.
4. The lens barrel according to claim 1, wherein a surface of the second negative power lens facing the image side and a surface of the fourth positive power lens facing the object side have the same radius of curvature.
5. The lens barrel as claimed in claim 4, wherein the second negative power lens is a biconcave lens;
the fourth positive power lens is a meniscus lens, and the surface of the fourth positive power lens facing the object side is a convex surface.
6. The lens barrel according to claim 4, wherein a surface of the seventh positive power lens facing the image side and a surface of the third negative power lens facing the object side have the same radius of curvature.
7. The lens barrel as claimed in claim 6, wherein the seventh positive power lens is a convex lens whose surface facing the object side is a convex surface;
the third negative-power lens is a concave lens, and the surface of the third negative-power lens facing the image side is a concave surface.
8. The lens barrel according to claim 6, wherein abbe numbers of the fourth positive power lens, the fifth positive power lens and the seventh positive power lens are 65 or more.
9. The lens barrel as claimed in claim 6, wherein the refractive index of each of the sixth positive power lens and the third negative power lens is 1.9 or more.
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| CN201910866277.5A CN110579861B (en) | 2019-09-12 | 2019-09-12 | Lens |
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| CN201910866277.5A CN110579861B (en) | 2019-09-12 | 2019-09-12 | Lens |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861229A (en) * | 2017-12-12 | 2018-03-30 | 厦门爱劳德光电有限公司 | A kind of high definition wide-angle unmanned plane camera lens |
| CN208314310U (en) * | 2018-06-20 | 2019-01-01 | 广东奥普特科技股份有限公司 | A kind of big target surface focusing machine visual linear array camera lens |
| JP2019109539A (en) * | 2019-03-04 | 2019-07-04 | 株式会社タムロン | Optical system and imaging apparatus |
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2019
- 2019-09-12 CN CN201910866277.5A patent/CN110579861B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861229A (en) * | 2017-12-12 | 2018-03-30 | 厦门爱劳德光电有限公司 | A kind of high definition wide-angle unmanned plane camera lens |
| CN208314310U (en) * | 2018-06-20 | 2019-01-01 | 广东奥普特科技股份有限公司 | A kind of big target surface focusing machine visual linear array camera lens |
| JP2019109539A (en) * | 2019-03-04 | 2019-07-04 | 株式会社タムロン | Optical system and imaging apparatus |
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