CN111897091B - Lens - Google Patents
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- CN111897091B CN111897091B CN202010776078.8A CN202010776078A CN111897091B CN 111897091 B CN111897091 B CN 111897091B CN 202010776078 A CN202010776078 A CN 202010776078A CN 111897091 B CN111897091 B CN 111897091B
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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, wherein 11 lenses with specific focal power are sequentially arranged in the lens from an object side to an image side according to a specific sequence, the size of a target surface of the lens is improved, the Abbe numbers of a second positive focal power lens, a fourth positive focal power lens and a fifth positive focal power lens are all more than or equal to 63, the function of eliminating heat difference is realized, and the refractive indexes of a first positive focal power lens and a seventh positive focal power lens are all more than or equal to 1.8; the refractive index of the third positive focal power lens is larger than or equal to 1.9, so that the refractive index of the lens is improved, and the volume of the lens is reduced. Therefore, the embodiment of the invention provides the lens which has the advantages of small volume, large target surface size and heat difference elimination function.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Along with the development of society, people's safety precaution consciousness is constantly improved, and security protection monitoring industry also obtains high-speed development, and the effect of control performance is also bigger and bigger. The existing lens on the market is generally simple in structure, the target surface of the lens is more than 1/1.8 inches or 2/3 inches, the requirement for a large target surface in the monitoring field can not be met gradually, the design volume of the small number of lenses capable of meeting the requirement for the large target surface is generally large, certain limitation is brought to the adaptability of a product, in addition, the existing lens on the market generally does not consider the heat dissipation function, and the quality of the collected image can not be guaranteed. Therefore, it is important to develop a lens with small size, large target surface size and heat difference elimination function.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a lens with small volume, large target surface size and heat difference elimination function.
The embodiment of the present invention provides a lens including a first positive power lens, a first negative power lens, a second positive power lens, a third negative power lens, a third positive power lens, a fourth negative power lens, a fifth positive power lens, a sixth positive power lens, a seventh positive power lens, and an image plane, which are sequentially arranged from an object side to an image side;
the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all more than or equal to 63;
the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are both more than or equal to 1.8; the refractive index of the third positive power lens is greater than or equal to 1.9.
Further, an aperture diaphragm is arranged between the third positive power lens and the fourth positive power lens.
Further, an optical filter is arranged between the seventh positive focal power lens and the image plane.
Further, the curvature radius of one surface of the second positive power lens facing the image side is the same as that of one surface of the third negative power lens facing the object side.
Further, the second positive power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the third negative power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a concave surface.
Further, the curvature radius of one surface of the fourth positive power lens facing the image side is the same as that of one surface of the fourth negative power lens facing the object side; and 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.
Further, the fourth positive power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens facing the image side is convex;
the fourth negative power lens comprises a biconcave lens;
the fifth positive power lens includes a biconvex lens.
Further, the first positive power lens includes a meniscus lens, and a surface of the meniscus lens facing the object side is convex;
the first negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the second negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the third positive power lens comprises a biconvex lens;
the sixth positive power lens includes a biconvex lens;
the seventh positive power lens includes a biconvex lens or a convex lens, and a surface thereof facing the object side is convex.
The embodiment of the present invention provides a lens including a first positive power lens, a first negative power lens, a second positive power lens, a third negative power lens, a third positive power lens, a fourth negative power lens, a fifth positive power lens, a sixth positive power lens, a seventh positive power lens, and an image plane, which are sequentially arranged from an object side to an image side; the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all more than or equal to 63; the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are both more than or equal to 1.8; the refractive index of the third positive power lens is greater than or equal to 1.9.
In the embodiment of the invention, 11 lenses with specific focal power are arranged in the lens from the object side to the image side in sequence according to a specific sequence, so that the size of a target surface of the lens is increased, the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all larger than or equal to 63, the function of eliminating heat difference is realized, and the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are all larger than or equal to 1.8; the refractive index of the third positive focal power lens is larger than or equal to 1.9, so that the refractive index of the lens is improved, and the volume of the lens is reduced. Therefore, the embodiment of the invention provides the lens which has the advantages of small volume, large target surface size and heat difference elimination function.
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 diagram of a lens according to an embodiment of the present invention, where the lens includes, in order from an object side to an image side, a first positive power lens L1, a first negative power lens L2, a second negative power lens L3, a second positive power lens L4, a third negative power lens L5, a third positive power lens L6, a fourth positive power lens L7, a fourth negative power lens L8, a fifth positive power lens L9, a sixth positive power lens L10, a seventh positive power lens L11, and an image plane M;
the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all more than or equal to 63;
the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are both more than or equal to 1.8; the refractive index of the third positive power lens is greater than or equal to 1.9.
In the embodiment of the invention, the 11 lenses with specific focal power are arranged in the lens from the object side to the image side in a specific sequence, so that the target surface size of the lens is increased. In addition, in order to enable the lens to have the function of eliminating the thermal difference and to clearly form images at the temperature of-30 ℃ to 70 ℃, in the embodiment of the invention, the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all larger than or equal to 63. In addition, the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all larger than or equal to 63, so that the chromatic aberration of an image can be reduced, and the imaging quality is further improved. The abbe numbers of the second positive power lens, the fourth positive power lens and the fifth positive power lens may be the same or different.
In order to increase the refractive index of the lens and reduce the volume of the lens, in the embodiment of the invention, the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are both greater than or equal to 1.8; the refractive index of the third positive power lens is greater than or equal to 1.9. The refractive indexes of the first positive focal power lens and the seventh positive focal power lens are both more than or equal to 1.8; the refractive index of the third positive focal power lens is larger than or equal to 1.9, the spherical aberration can be reduced, and the imaging quality is further improved. The refractive indexes of the first positive power lens and the seventh positive power lens can be the same or different.
In the embodiment of the invention, 11 lenses with specific focal power are sequentially arranged in the lens from the object side to the image side according to a specific sequence, the size of a target surface of the lens is increased, the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all larger than or equal to 63, the function of eliminating heat difference is realized, and the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are all larger than or equal to 1.8; the refractive index of the third positive focal power lens is larger than or equal to 1.9, so that the refractive index of the lens is improved, and the volume of the lens is reduced. Therefore, the embodiment of the invention provides the lens which has the advantages of small volume, large target surface size and heat difference elimination function.
In an embodiment of the invention, an aperture diaphragm is arranged between the third positive power lens and the fourth positive power lens.
The aperture size of the aperture diaphragm determines the aperture value of the lens 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 lens and the depth of field is achieved.
An optical filter N is arranged between the seventh 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, a curvature radius of a surface of the second positive power lens facing the image side is the same as a curvature radius of a surface of the third negative power lens facing the object side.
The second positive focal power lens comprises a meniscus lens, and one surface of the meniscus lens facing the image side is a convex surface;
the third negative power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a concave surface.
To further enable the system to be compact, the second positive power lens and the third negative power lens may be cemented or otherwise snugly connected.
In order to further improve the imaging quality of the lens, in the embodiment of the present invention, a curvature radius of a surface of the fourth positive power lens facing the image side is the same as a curvature radius of a surface of the fourth negative power lens facing the object side; and 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 positive focal power lens comprises a meniscus lens or a convex lens, and one surface of the meniscus lens or the convex lens facing the image side is a convex surface;
the fourth negative power lens comprises a biconcave lens;
the fifth positive power lens includes a biconvex lens.
To further enable the system to be compact, the fourth positive power lens and the fourth negative power lens may be cemented or otherwise snugly connected. The fourth negative power lens and the fifth positive power lens may be cemented or adhesively connected.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the first positive power lens includes a meniscus lens, and one surface of the meniscus lens facing the object side is a convex surface;
the first negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the second negative-power lens comprises a meniscus lens, and one surface of the meniscus lens, which faces the object side, is a convex surface;
the third positive power lens comprises a biconvex lens;
the sixth positive power lens includes a biconvex lens;
the seventh positive power lens includes a biconvex lens or a convex lens, and a surface thereof facing the object side is convex.
The optical performance of the lens provided by the embodiment of the invention is as follows:
the lens provided by the embodiment of the invention can support 1.1 inch at most, effectively realizes the miniaturization of the lens structure, ensures the imaging quality, performs the heat difference elimination design and can adapt to the environment of-30-70 ℃. The imaging can support the use of a Sensor of 1.1' at most, and when the aperture F is 1.5, the total length of the system is not more than 80 mm; 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 ℃; the MTF value of the full field of view reaches about 0.3 under the condition of 120lp/mm, and the resolution requirement of the current 1200 ten thousand pixel camera is met.
The embodiment of the invention adopts the technical scheme, effectively controls the cost and the volume of the lens, and realizes the lens with low cost, small volume, poor heat dissipation and high resolution.
The following exemplifies the lens parameters provided by the embodiment of the present invention.
Example 1:
in a specific implementation, the radius of curvature R, the center thickness Tc, the refractive index Nd, and the abbe constant Vd of each lens of the imaging system satisfy the conditions listed in table 1:
TABLE 1
The lens provided by the embodiment has the following optical technical indexes:
the total optical length TTL is less than or equal to 80 mm;
focal length f' of the lens: 12 mm;
angle of view of lens: 70 degrees;
optical distortion of the lens: -7.14%;
aperture fno of lens system: f1.5;
size of a lens image plane: >1 ".
The imaging system provided by the present embodiment will be further described by analyzing the embodiments in detail.
The optical transfer function is used for evaluating the imaging quality of the imaging system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
As shown in fig. 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, it is a graph of the optical transfer function (MTF) of the lens in the visible band-30 ℃; as shown in fig. 4, it is 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) curve of the lens in the normal temperature state in the visible light region is relatively smooth and concentrated, and the average MTF value of the full field of view (half-image height Y' is 8mm) is 0.4 or more; therefore, the imaging system provided by the embodiment can achieve high resolution, and meet the imaging requirement of a 1-inch 1200-ten-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 8mm) reaches more than 0.3, so that high imaging quality can be still kept, the lens is ensured to be suitable for complex environment, and all-weather high-definition video monitoring is realized.
In summary, the embodiments of the present invention provide an optical lens with low cost, small volume and reduced thermal difference. Adopting 11 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; realize the volume miniaturization and ensure high-quality imaging simultaneously, have outstanding environmental suitability, but wide application in security protection monitoring field, especially intelligent transportation, road monitoring field.
The size of the imaging surface of the lens provided by the embodiment of the invention is the highest and supports the use of a target surface of 1.1' and meets the requirement of small volume; the temperature compensation design is carried out in the optical design stage, so that the imaging definition of the lens is hardly reduced in an environment of-30 ℃ to +70 ℃; the MTF value of the full field of view reaches more than 0.3 under the condition of 120lp/mm, and the resolution requirement of the current 1200 ten thousand pixel camera can be well met.
The embodiment of the present invention provides a lens including a first positive power lens, a first negative power lens, a second positive power lens, a third negative power lens, a third positive power lens, a fourth negative power lens, a fifth positive power lens, a sixth positive power lens, a seventh positive power lens, and an image plane, which are sequentially arranged from an object side to an image side; the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all more than or equal to 63; the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are both more than or equal to 1.8; the refractive index of the third positive power lens is greater than or equal to 1.9.
In the embodiment of the invention, 11 lenses with specific focal power are arranged in the lens from the object side to the image side in sequence according to a specific sequence, so that the size of a target surface of the lens is increased, the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all larger than or equal to 63, the function of eliminating heat difference is realized, and the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are all larger than or equal to 1.8; the refractive index of the third positive focal power lens is larger than or equal to 1.9, so that the refractive index of the lens is improved, and the volume of the lens is reduced. Therefore, the embodiment of the invention provides the lens which has the advantages of small volume, large target surface size and heat difference elimination function.
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 positive focal power lens, a first negative focal power lens, a second positive focal power lens, a third negative focal power lens, a third positive focal power lens, a fourth negative focal power lens, a fifth positive focal power lens, a sixth positive focal power lens, a seventh positive focal power lens and an image plane which are sequentially arranged from an object side to an image side;
the abbe numbers of the second positive focal power lens, the fourth positive focal power lens and the fifth positive focal power lens are all more than or equal to 63;
the refractive indexes of the first positive focal power lens and the seventh positive focal power lens are both more than or equal to 1.8; the refractive index of the third positive-power lens is greater than or equal to 1.9;
the focal length of the lens is 12 mm; the field angle is 70 degrees; the aperture is F1.5.
2. The lens barrel as claimed in claim 1, wherein an aperture stop is disposed between the third positive power lens and the fourth positive power lens.
3. The lens barrel according to claim 1, wherein an optical filter is provided between the seventh positive power lens and the image plane.
4. The lens barrel according to claim 1, wherein a surface of the second 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.
5. The lens barrel as claimed in claim 4, wherein the second positive power lens is a meniscus lens, and a surface thereof facing the image side is convex;
the third negative power lens is a meniscus lens, and one surface of the third negative power lens facing the object side is a concave surface.
6. 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; and 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.
7. The lens barrel according to claim 6, wherein the fourth positive power lens is a meniscus lens or a convex lens, and a surface facing the image side of the fourth positive power lens is a convex surface;
the fourth negative focal power lens is a biconcave lens;
the fifth positive focal power lens is a biconvex lens.
8. The lens barrel as claimed in claim 1, wherein the first positive power lens is a meniscus lens, and a surface thereof facing the object side is a convex surface;
the first negative focal power lens is a meniscus lens, and one surface of the first negative focal power lens facing the object side is a convex surface;
the second negative focal power lens is a meniscus lens, and one surface of the second negative focal power lens facing the object side is a convex surface;
the third positive focal power lens is a biconvex lens;
the sixth positive focal power lens is a biconvex lens;
the seventh positive power lens is a biconvex lens or a convex lens, and one surface of the seventh positive power lens facing the object side is a convex surface.
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| CN202010776078.8A CN111897091B (en) | 2020-08-05 | 2020-08-05 | Lens |
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| CN202010776078.8A CN111897091B (en) | 2020-08-05 | 2020-08-05 | Lens |
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| CN111897091B true CN111897091B (en) | 2021-12-14 |
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| JP2019132920A (en) * | 2018-01-30 | 2019-08-08 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| JP2020052349A (en) * | 2018-09-28 | 2020-04-02 | 富士フイルム株式会社 | Image capturing lens and image capturing device |
| CN111344617A (en) * | 2017-11-15 | 2020-06-26 | 株式会社尼康 | Imaging lens, imaging optical device, digital apparatus, and method for manufacturing imaging lens |
| CN211149039U (en) * | 2020-01-17 | 2020-07-31 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN211149040U (en) * | 2020-01-17 | 2020-07-31 | 厦门力鼎光电股份有限公司 | Optical imaging system |
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2020
- 2020-08-05 CN CN202010776078.8A patent/CN111897091B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001013409A (en) * | 1999-06-28 | 2001-01-19 | Canon Inc | Zoom lens |
| JP2009237400A (en) * | 2008-03-28 | 2009-10-15 | Fujinon Corp | Variable power optical system and imaging apparatus |
| CN111344617A (en) * | 2017-11-15 | 2020-06-26 | 株式会社尼康 | Imaging lens, imaging optical device, digital apparatus, and method for manufacturing imaging lens |
| CN207833090U (en) * | 2017-12-27 | 2018-09-07 | 东莞市宇瞳光学科技股份有限公司 | A kind of wide-angle machine visual lens |
| JP2019132920A (en) * | 2018-01-30 | 2019-08-08 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| JP2020052349A (en) * | 2018-09-28 | 2020-04-02 | 富士フイルム株式会社 | Image capturing lens and image capturing device |
| CN211149039U (en) * | 2020-01-17 | 2020-07-31 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN211149040U (en) * | 2020-01-17 | 2020-07-31 | 厦门力鼎光电股份有限公司 | Optical imaging system |
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