CN113325546B - Lens - Google Patents
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- CN113325546B CN113325546B CN202110496117.3A CN202110496117A CN113325546B CN 113325546 B CN113325546 B CN 113325546B CN 202110496117 A CN202110496117 A CN 202110496117A CN 113325546 B CN113325546 B CN 113325546B
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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Abstract
The invention discloses a lens, which comprises a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, a second positive focal power lens, a first lens group, a second lens group, a fifth positive focal power lens, a sixth positive focal power lens, an optical filter and an image plane, wherein the first negative focal power lens, the second negative focal power lens, the first positive focal power lens, the second positive focal power lens, the first lens group, the second lens group, the fifth positive focal power lens, the sixth positive focal power lens, the optical filter and the image plane are sequentially arranged from an object side to an image side; the lens group satisfies the following conditions: -9.2< (fg1/fg2) > f system < -8.7; wherein fg1 is the focal length of the first lens group, fg2 is the focal length of the second lens group, and the f system is the system focal length of the lens. Therefore, the embodiment of the invention provides a large-image-surface ultra-star high-definition lens.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
With the development of security monitoring technology, the application scenes of the fixed focus lens are more and more, but the conventional security monitoring and road condition monitoring device has the following defects: the target surface of a fixed-focus lens adopted by the existing road monitoring camera is mostly 1/1.8 inch or 2/3 inch, an image sensor with a large target surface of 1/1.2 inch is gradually applied in the market, and the original fixed-focus lens can not meet the requirement of the large target surface of the industry gradually. A few lenses capable of meeting the requirement of a large target surface are also available in the market, but the number of the common lenses is large, and the cost is high. Therefore, it is very important to develop a large-image-plane superstar optical high-definition lens.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a large-image-surface ultra-star high-definition lens.
The embodiment of the present invention provides a lens assembly, which includes a first negative power lens, a second negative power lens, a first positive power lens, a second positive power lens, a first lens group, a second lens group, a fifth positive power lens, a sixth positive power lens, 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:
-9.2< (fg1/fg2) > f system < -8.7;
wherein fg1 is the focal length of the first lens group, fg2 is the focal length of the second lens group, and the f system is the system focal length of the lens.
Further, the first lens group includes a third positive power lens and a third negative power lens arranged in order from the object side to the image side;
the third positive power lens comprises a biconvex lens;
the third negative power lens includes a biconcave lens.
Further, a surface of the third 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.
Further, the second lens group includes a fourth positive power lens and a fourth negative power lens arranged in order from the object side to the image side;
the fourth positive power lens comprises a biconvex lens;
the fourth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface.
Further, a surface of the fourth positive power lens facing the image side and a surface of the fourth negative power lens facing the object side have the same radius of curvature.
Further, the first negative power lens includes a meniscus lens, and a surface of the meniscus lens facing the object side is convex;
the second negative focal power lens comprises a concave lens, and one surface of the concave lens facing the image side is a plane;
the first positive focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the second positive power lens comprises a biconvex lens;
the fifth positive power lens includes a biconvex lens;
the sixth positive power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is convex.
Further, the focal length f1 of the first negative-power lens is less than or equal to-13; the focal length f6 of the third negative focal power lens is more than or equal to-9.5; the focal length f10 of the sixth positive focal power lens is more than or equal to 50.
Furthermore, the Abbe number Vd1 of the first negative focal power lens is more than or equal to 35; the Abbe number Vd7 of the fourth positive focal power lens is not less than 60; the Abbe number Vd10 of the sixth positive focal power lens is more than or equal to 70.
Further, the refractive index Nd1 of the first negative-power lens is more than or equal to 1.8; the refractive index Nd2 of the second negative-power lens is less than or equal to 1.86; the refractive index Nd3 of the first positive power lens is less than or equal to 1.88; the refractive index Nd4 of the second positive power lens is less than or equal to 1.90.
Further, an aperture stop is disposed on a surface of the third positive power lens facing the object side.
The embodiment of the present invention provides a lens assembly, which includes a first negative power lens, a second negative power lens, a first positive power lens, a second positive power lens, a first lens group, a second lens group, a fifth positive power lens, a sixth positive power lens, 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: -9.2< (fg1/fg2) > f system < -8.7; wherein fg1 is the focal length of the first lens group, fg2 is the focal length of the second lens group, and the f system is the system focal length of the lens. Therefore, the embodiment of the invention provides a large-image-surface ultra-star high-definition 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 provided in 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 schematic view of a field curvature and a wavelength band of a lens in a visible light wavelength band according to an embodiment of the present invention;
fig. 4 is a transverse fan diagram of the lens provided by the embodiment of the invention in the visible light band;
fig. 5 is a dot-column diagram of a lens provided in an embodiment of the present invention in a visible light band.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of a lens barrel according to an embodiment of the present invention, the lens barrel includes, in order from an object side to an image side, a first negative power lens L1, a second negative power lens L2, a first positive power lens L3, a second positive power lens L4, a first lens group G1, a second lens group G2, a fifth positive power lens L9, a sixth positive power lens L10, a filter N, and an image plane M;
the lens group satisfies the following conditions:
-9.2< (fg1/fg2) > f system < -8.7;
wherein fg1 is the focal length of the first lens group, fg2 is the focal length of the second lens group, and the f system is the system focal length of the lens.
Since two lens groups 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: 9.2< - (fg1/fg2) < -8.7, and a large-image-plane ultra-star high-definition lens is realized.
An optical filter N is arranged between the sixth positive focal power lens and the image plane, and the optical filter is an optical device used for selecting a required radiation wave band.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, the first lens group G1 includes a third positive power lens L5 and a third negative power lens L6 arranged in order from the object side to the image side;
the third positive power lens comprises a biconvex lens;
the third negative power lens includes a biconcave lens.
In order to further enable the lens to be compact, a surface of the third 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. The third positive power lens and the third 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 second lens group includes a fourth positive power lens L7 and a fourth negative power lens L8 arranged in order from the object side to the image side;
the fourth positive power lens comprises a biconvex lens;
the fourth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface.
In order to further enable the lens to be compact, a surface of the fourth positive power lens facing the image side and a surface of the fourth negative power lens facing the object side have the same radius of curvature. The fourth positive power lens and the fourth 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 first negative power lens includes a meniscus lens, and one surface of the meniscus lens facing the object side is a convex surface;
the second negative focal power lens comprises a concave lens, and one surface of the concave lens facing the image side is a plane;
the first positive focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the second positive power lens comprises a biconvex lens;
the fifth positive power lens includes a biconvex lens;
the sixth positive power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is convex.
In order to further improve the imaging quality of the lens, in the embodiment of the invention, the focal length f1 of the first negative power lens is less than or equal to-13; the focal length f6 of the third negative focal power lens is more than or equal to-9.5; the focal length f10 of the sixth positive focal power lens is more than or equal to 50.
In the embodiment of the invention, in order to clearly image at the lens from minus 30 ℃ to 70 ℃, in the embodiment of the invention, the Abbe number Vd1 of the first negative-power lens is more than or equal to 35; the Abbe number Vd7 of the fourth positive focal power lens is not less than 60; the Abbe number Vd10 of the sixth positive focal power lens is more than or equal to 70. In addition, the Abbe number Vd1 of the first negative focal power lens is not less than 35; the Abbe number Vd7 of the fourth positive focal power lens is not less than 60; the Abbe number Vd10 of the sixth positive focal power lens is more than or equal to 70, and the chromatic aberration of an image can be reduced, so that the imaging quality is improved.
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 index Nd1 of the first negative-power lens is more than or equal to 1.8; the refractive index Nd2 of the second negative-power lens is less than or equal to 1.86; the refractive index Nd3 of the first positive power lens is less than or equal to 1.88; the refractive index Nd4 of the second positive power lens is less than or equal to 1.90. Furthermore, the spherical aberration can be reduced, and the imaging quality is improved.
An aperture STOP is arranged on one surface of the third positive power lens facing the object side. 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 the requirement to realize the adjustment of the clear aperture, namely the purpose of changing the aperture value of the system and the depth of field is achieved.
The lens provided by the embodiment of the invention can support 1/1.2 inch at most, effectively realizes the miniaturization of the lens structure, ensures the imaging quality, performs the design of eliminating the thermal difference and can adapt to the environment of-30-70 ℃. The imaging can support the use of a Sensor with the maximum size of 1/1.2 inch, the aperture F is 1.0, and the total length of the system does not exceed 63 mm; the MTF value of the full field of view reaches about 0.4 under the condition of 100lp/mm, and the resolution requirement of the current 800-ten-thousand-pixel camera is met.
The following exemplifies the lens parameters provided by the embodiment of the present invention.
Data such as the radius of curvature, center thickness Tc, refractive index Nd, and abbe constant Vd of each lens are shown in table 1:
TABLE 1
Note that the mirror numbers in table 1 are the numbers of the left to right lenses in the schematic view of the lens configuration 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 63 mm;
lens focal length f system: 7.4 mm;
angle of view of lens: 110 degrees;
optical distortion of the lens: -4.3%;
aperture fno of lens system: f1.0;
size of a lens image plane: greater than 1/1.2'.
The lens provided by the embodiment is further described by analyzing the embodiment in detail.
The optical transfer function is used for evaluating the imaging quality of the imaging system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
As shown in fig. 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, the field curvature and distortion diagram of the lens in the visible light band is shown; as shown in fig. 4, it is a lateral fan diagram of the lens in the visible band. As shown in fig. 5, a dot-sequence diagram of the lens in the visible light band is shown.
As can be seen from fig. 2, the optical transfer function (MTF) curve 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 6.4mm) reaches 0.35 or more; therefore, the imaging system provided by the embodiment can achieve high resolution and meet the imaging requirement of a 1/1.2 inch 800 ten thousand pixel camera.
In summary, the embodiment of the invention provides an optical lens with low cost, large target surface and high imaging definition. The imaging system has the advantages that 10 optical lenses with specific structural shapes are adopted and are sequentially arranged from the object side to the image side according to a specific sequence, and the specific focal power of each optical lens is distributed and combined, so that the imaging system can realize better distortion control and excellent imaging characteristics, has excellent environmental adaptability, and can be widely applied to the field of security monitoring, particularly the fields of intelligent transportation, road monitoring and the like.
The size of the image surface of the lens provided by the embodiment of the invention is perfectly matched with a 1/1.2 inch sensor (CCD/CMOS), so that the requirement of the industry on a large target surface 4K lens is met; under the condition that the MTF value of the full field of view is 100lp/mm, the MTF value reaches more than 0.35, and the resolution requirement of the current 800-ten-thousand-pixel camera can be well met; the focal power of each lens of the lens is distributed reasonably, the shape of the lens is convenient to process, and the cost of the lens is low.
The embodiment of the present invention provides a lens assembly, which includes a first negative power lens, a second negative power lens, a first positive power lens, a second positive power lens, a first lens group, a second lens group, a fifth positive power lens, a sixth positive power lens, 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: -9.2< (fg1/fg2) > f system < -8.7; wherein fg1 is the focal length of the first lens group, fg2 is the focal length of the second lens group, and the f system is the system focal length of the lens. Therefore, the embodiment of the invention provides a large-image-surface ultra-star high-definition 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 (8)
1. The lens is characterized by comprising a first negative focal power lens, a second negative focal power lens, a first positive focal power lens, a second positive focal power lens, a first lens group, a second lens group, a fifth positive focal power lens, a sixth positive focal power lens, 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:
-9.2< (fg1/fg2) > f system < -8.7;
wherein fg1 is the focal length of the first lens group, fg2 is the focal length of the second lens group, and the f system is the system focal length of the lens;
the first lens group comprises a third positive focal power lens and a third negative focal power lens which are arranged in sequence from the object side to the image side;
the third positive power lens comprises a biconvex lens;
the third negative power lens comprises a biconcave lens;
the second lens group comprises a fourth positive focal power lens and a fourth negative focal power lens which are arranged in sequence from the object side to the image side;
the fourth positive power lens comprises a biconvex lens;
the fourth negative-power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface.
2. The lens barrel according to claim 1, wherein a surface of the third 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.
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 fourth negative power lens facing the object side have the same radius of curvature.
4. The lens barrel as claimed in claim 1, wherein the first negative power lens includes a meniscus lens whose surface facing the object side is convex;
the second negative focal power lens comprises a concave lens, and one surface of the concave lens facing the image side is a plane;
the first positive focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the second positive power lens comprises a biconvex lens;
the fifth positive power lens includes a biconvex lens;
the sixth positive power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is convex.
5. The lens barrel as claimed in claim 1, wherein the first negative power lens has a focal length f1 ≦ 13; the focal length f6 of the third negative focal power lens is more than or equal to-9.5; the focal length f10 of the sixth positive focal power lens is more than or equal to 50.
6. The lens barrel as claimed in claim 1, wherein the first negative power lens has an abbe number Vd1 ≥ 35; the Abbe number Vd7 of the fourth positive focal power lens is not less than 60; the Abbe number Vd10 of the sixth positive focal power lens is more than or equal to 70.
7. The lens barrel as claimed in claim 1, wherein the refractive index Nd1 of the first negative power lens is 1.8 or more; the refractive index Nd2 of the second negative-power lens is less than or equal to 1.86; the refractive index Nd3 of the first positive power lens is less than or equal to 1.88; the refractive index Nd4 of the second positive power lens is less than or equal to 1.90.
8. The lens barrel according to claim 1, wherein a surface of the third positive power lens facing the object side is provided with an aperture stop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110496117.3A CN113325546B (en) | 2021-05-07 | 2021-05-07 | Lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110496117.3A CN113325546B (en) | 2021-05-07 | 2021-05-07 | Lens |
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| Publication Number | Publication Date |
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| CN113325546A CN113325546A (en) | 2021-08-31 |
| CN113325546B true CN113325546B (en) | 2022-04-12 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003287679A (en) * | 2002-03-27 | 2003-10-10 | Ricoh Co Ltd | Zoom lens and camera device |
| JP2005024988A (en) * | 2003-07-03 | 2005-01-27 | Ricoh Co Ltd | Variable focal length lens, photographic lens unit, camera, and portable information terminal device |
| CN106772935A (en) * | 2016-12-07 | 2017-05-31 | 浙江大华技术股份有限公司 | A kind of lens combination and tight shot |
| CN108333730A (en) * | 2018-04-12 | 2018-07-27 | 厦门爱劳德光电有限公司 | A kind of high definition ultra-wide angle day and night confocal camera lens |
-
2021
- 2021-05-07 CN CN202110496117.3A patent/CN113325546B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003287679A (en) * | 2002-03-27 | 2003-10-10 | Ricoh Co Ltd | Zoom lens and camera device |
| JP2005024988A (en) * | 2003-07-03 | 2005-01-27 | Ricoh Co Ltd | Variable focal length lens, photographic lens unit, camera, and portable information terminal device |
| CN106772935A (en) * | 2016-12-07 | 2017-05-31 | 浙江大华技术股份有限公司 | A kind of lens combination and tight shot |
| CN108333730A (en) * | 2018-04-12 | 2018-07-27 | 厦门爱劳德光电有限公司 | A kind of high definition ultra-wide angle day and night confocal camera lens |
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| CN113325546A (en) | 2021-08-31 |
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