CN113325548B - Lens - Google Patents
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- CN113325548B CN113325548B CN202110533429.7A CN202110533429A CN113325548B CN 113325548 B CN113325548 B CN 113325548B CN 202110533429 A CN202110533429 A CN 202110533429A CN 113325548 B CN113325548 B CN 113325548B
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- 238000003384 imaging method Methods 0.000 claims description 22
- 230000005499 meniscus Effects 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 abstract description 24
- 238000010586 diagram Methods 0.000 description 11
- 230000006870 function Effects 0.000 description 10
- 230000004075 alteration Effects 0.000 description 9
- 238000012546 transfer Methods 0.000 description 6
- 238000004590 computer program Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a lens, which comprises a first negative focal power lens, a second negative focal power lens, a third negative focal power lens, a first positive focal power lens, a second positive focal power lens, a fourth negative focal power lens and a third positive focal power lens which are sequentially arranged from an object side to an image side; the lens satisfies the following conditions: 3.2< (tan (FOV/3)), <4.0; wherein FOV is the angle of view of the lens and f is the focal length of the lens. Since in the embodiment of the invention, lenses with set optical power are sequentially arranged from the object side to the image side in the lens in a specific order, the lens satisfies: 3.2< (tan (FOV/3)), <4.0; therefore, the embodiment of the invention provides the wide-angle lens with large aperture and high resolution.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Along with the development of security monitoring technology, the application scene of fixed focus lens is more and more, but conventional security monitoring and road condition monitoring device has following shortcoming: the monitoring field angle required by the existing video monitoring camera is larger and larger, but larger distortion is often introduced into a large field angle, so that the deformation of an image picture is serious, and the use requirement cannot be met. In addition, the resolution of a few large-aperture lenses in the market is relatively low, and the resolution of a higher-pixel camera cannot be met because the pixels can only support 200 to 400 tens of thousands. The aperture is small, typically F2.2 and above, and the target surface is typically 1/4 or 1/2.8 inch. Therefore, it is important to develop a wide-angle lens with large aperture and high resolution.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for providing a wide-angle lens with large aperture and high resolution.
The embodiment of the invention provides a lens, which comprises a first negative focal power lens, a second negative focal power lens, a third negative focal power lens, a first positive focal power lens, a second positive focal power lens, a fourth negative focal power lens and a third positive focal power lens which are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
3.2<(tan(FOV/3))*f<4.0；
wherein FOV is the angle of view of the lens and f is the focal length of the lens.
Further, the first negative power lens comprises a meniscus lens;
the second negative power lens comprises a meniscus lens;
the third negative power lens comprises a biconcave lens;
the first positive power lens includes a biconvex lens;
the second positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the third positive power lens includes a biconvex lens.
Further, one surface of the first negative focal power lens facing the image side is a concave surface; the surface of the second negative focal power lens facing the image side is a concave surface.
Further, the focal length f1 of the first negative focal power lens is more than or equal to-9.7, the focal length f4 of the first positive focal power lens is more than or equal to 4.9, and the focal length f6 of the fourth negative focal power lens is more than or equal to-4.
Further, the Abbe number Vd2 of the second negative focal power lens is more than or equal to 55; the Abbe number Vd3 of the third negative focal power lens is more than or equal to 25; the Abbe number Vd5 of the second positive focal power lens is more than or equal to 55.
Further, the refractive index Nd1 of the first negative focal power lens is less than or equal to 1.8; the refractive index Nd3 of the third negative focal power lens is less than or equal to 1.65; the refractive index Nd5 of the second positive focal power lens is more than or equal to 1.55; the refractive index Nd6 of the fourth negative focal power lens is less than or equal to 1.65.
Further, a diaphragm is arranged between the first positive focal power lens and the second positive focal power lens.
Further, the aperture stop includes an aperture stop.
Further, an optical filter is arranged on the image side of the third positive focal power lens.
Further, an imaging surface is arranged on the image side of the optical filter.
The embodiment of the invention provides a lens, which comprises a first negative focal power lens, a second negative focal power lens, a third negative focal power lens, a first positive focal power lens, a second positive focal power lens, a fourth negative focal power lens and a third positive focal power lens which are sequentially arranged from an object side to an image side; the lens satisfies the following conditions: 3.2< (tan (FOV/3)), <4.0; wherein FOV is the angle of view of the lens and f is the focal length of the lens. Since in the embodiment of the invention, lenses with set optical power are sequentially arranged from the object side to the image side in the lens in a specific order, the lens satisfies: 3.2< (tan (FOV/3)), <4.0; therefore, the embodiment of the invention provides the wide-angle lens with large aperture and high resolution.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a lens according to an embodiment of the present invention;
FIG. 2 is a graph of an optical transfer function (MTF) of a lens at normal temperature in a visible light band according to an embodiment of the present invention;
FIG. 3 is a graph of curvature of field and distortion of a lens in a visible light band according to an embodiment of the present invention;
fig. 4 is a transverse fan diagram of a lens in a visible light band according to an embodiment of the present invention;
FIG. 5 is a point diagram of a lens in a visible light band according to an embodiment of the present invention;
fig. 6 is a graph of optical transfer function (MTF) of a lens according to an embodiment of the present invention in an infrared 850nm band.
Detailed Description
The present invention will be described in further detail below with reference to the attached drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic view of a lens provided by an embodiment of the present invention, where the lens includes a first negative focal power lens L1, a second negative focal power lens L2, a third negative focal power lens L3, a first positive focal power lens L4, a second positive focal power lens L5, a fourth negative focal power lens L6, and a third positive focal power lens L7, which are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
3.2<(tan(FOV/3))*f<4.0；
wherein FOV is the angle of view of the lens and f is the focal length of the lens.
Since in the embodiment of the invention, lenses with set optical power are sequentially arranged from the object side to the image side in the lens in a specific order, the lens satisfies: 3.2< (tan (FOV/3)), <4.0; therefore, the embodiment of the invention provides the wide-angle lens with large aperture and high resolution.
In order to further improve the imaging quality of the lens, in an embodiment of the present invention, the first negative power lens includes a meniscus lens;
the second negative power lens comprises a meniscus lens;
the third negative power lens comprises a biconcave lens;
the first positive power lens includes a biconvex lens;
the second positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the third positive power lens includes a biconvex lens.
The surface of the first negative focal power lens facing the image side is a concave surface; the surface of the second negative focal power lens facing the image side is a concave surface.
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 focal power lens is more than or equal to-9.7, the focal length f4 of the first positive focal power lens is more than or equal to 4.9, and the focal length f6 of the fourth negative focal power lens is more than or equal to-4.
In the embodiment of the invention, in order to clearly image at the temperature of-30 ℃ to 70 ℃, the Abbe number Vd2 of the second negative focal power lens is more than or equal to 55; the Abbe number Vd3 of the third negative focal power lens is more than or equal to 25; the Abbe number Vd5 of the second positive focal power lens is more than or equal to 55. In addition, the Abbe number Vd2 of the second negative focal power lens is more than or equal to 55; the Abbe number Vd3 of the third negative focal power lens is more than or equal to 25; the Abbe number Vd5 of the second positive focal power lens is more than or equal to 55, and the chromatic aberration of the 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 focal power lens is less than or equal to 1.8; the refractive index Nd3 of the third negative focal power lens is less than or equal to 1.65; the refractive index Nd5 of the second positive focal power lens is more than or equal to 1.55; the refractive index Nd6 of the fourth negative focal power lens is less than or equal to 1.65. The refractive index Nd1 of the first negative focal power lens is less than or equal to 1.8; the refractive index Nd3 of the third negative focal power lens is less than or equal to 1.65; the refractive index Nd5 of the second positive focal power lens is more than or equal to 1.55; the refractive index Nd6 of the fourth negative focal power lens is less than or equal to 1.65, so that spherical aberration can be reduced, and imaging quality can be improved.
A diaphragm P is arranged between the first positive focal power lens and the second positive focal power lens. The aperture stop includes an aperture stop.
An optical filter M is arranged on the image side of the third positive focal power lens. The image side of the filter is provided with an imaging plane N. The optical filter is an optical device for selecting a desired radiation band.
The lens design proposal provided by the embodiment of the invention can support 1/2.5 inch at the highest, effectively realize the miniaturization of the lens structure and ensure the imaging quality, and is suitable for the environment of minus 30 ℃ to 70 ℃ for use by performing the heat difference elimination design. Imaging can support Sensor use of 1/2.5 inch at the highest, aperture F is below 2.0, and total system length is not more than 18.4mm; the full-view field MTF value reaches more than 0.5 under the condition of 100lp/mm, and the resolution requirement of a 500-ten-thousand-pixel camera can be supported at the highest. And the compatible design of infrared confocal is considered, so that the scene requirement of day and night dual-purpose can be realized.
The following illustrates lens parameters provided in the embodiments 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 second negative focal power lens, the third negative focal power lens, the second positive focal power lens, the fourth negative focal power lens and the third positive focal power lens in the embodiment of the invention are aspheric lenses.
The aspherical cone coefficients can be defined by the following aspherical formula, but are not limited to the following representation:
wherein Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius; k is a fitting cone coefficient; a-G are 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th order polynomial coefficients of the aspherical polynomial.
The aspherical surface type parameters in the embodiment of the invention are shown in table 2, and table 2 is a design value of aspherical coefficients in the wide-angle lens provided in the embodiment of the invention.
Table 2:
in the schematic lens structures shown in fig. 1, the surface numbers in tables 1 and 2 are those of lenses from left to right.
The lens provided by the embodiment of the invention has the following optical technical indexes:
the total optical length TTL is less than or equal to 18.4mm;
lens focal length f:2.7mm;
angle of field of the lens: 160 °;
optical distortion of the lens: -11.9%;
aperture f No. of lens system: f1.95;
lens image surface size: > 1/2.5 ".
The lens structure of the embodiment of the present invention is shown in fig. 1, and the lens provided in embodiment 1 is further described below by performing detailed analysis of the optical system in embodiment 1.
The optical transfer function is used for evaluating an imaging quality of the imaging system in a more accurate, visual and common mode, and the higher and smoother the curve is, which shows that the better the imaging quality of the system is, the better correction is carried out on various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical chromatic aberration and the like).
As shown in fig. 2, an optical transfer function (MTF) curve of the lens at normal temperature in the visible light band is shown; as shown in fig. 3, the field curvature and distortion diagram of the lens in the visible light band are shown; as shown in fig. 4, a transverse fan diagram of the lens in the visible light band is shown; as shown in fig. 5, a point column diagram of the lens in the visible light band; as shown in fig. 6, an optical transfer function (MTF) curve of the lens at the infrared 850nm band is shown.
As can be seen from fig. 2, the optical transfer function (MTF) curve of the lens at normal temperature in the visible light portion is smoother and more concentrated, and the MTF average value in the full field of view (half image height Y' =3.3 mm) reaches more than 0.6; therefore, the lens provided by the embodiment can reach high resolution and meet the imaging requirement of a 1/2.5 inch 500 ten thousand pixel camera.
As can be seen from fig. 3, the maximum distortion of the lens is controlled within-12%. As can be seen from fig. 4 and fig. 5, the lens has a concentrated imaging range at different angles of view and different wavelength ranges, and the radius of the airy spot is also concentrated, so that the imaging quality is good.
As shown in fig. 6, when the lens is infrared at 850nm, the average value of the MTF of the full field of view (half image height Y' =3.3 mm) reaches more than 0.5, the overall MTF is not greatly reduced, and the imaging system can be used in a scene with dual purposes of day and night.
The embodiment of the invention provides an optical lens with low cost, large target surface and high imaging definition. The imaging system adopts 7 optical lenses with specific structural shapes, the optical lenses are sequentially arranged from an object side to an image side according to a specific sequence, and the imaging system can realize better distortion control and excellent imaging characteristics through the distribution and combination of specific optical power of each optical lens, has excellent environmental adaptability, and can be widely applied to the field of security monitoring. The focal power distribution of each lens of the lens is reasonable, the shape of the lens is convenient to process, and the cost of the lens is low.
The embodiment of the invention provides a lens, which comprises a first negative focal power lens, a second negative focal power lens, a third negative focal power lens, a first positive focal power lens, a second positive focal power lens, a fourth negative focal power lens and a third positive focal power lens which are sequentially arranged from an object side to an image side; the lens satisfies the following conditions: 3.2< (tan (FOV/3)), <4.0; wherein FOV is the angle of view of the lens and f is the focal length of the lens. Since in the embodiment of the invention, lenses with set optical power are sequentially arranged from the object side to the image side in the lens in a specific order, the lens satisfies: 3.2< (tan (FOV/3)), <4.0; therefore, the embodiment of the invention provides the wide-angle lens with 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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. It is therefore intended that the following claims be interpreted as including the 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. The lens is characterized by comprising a first negative focal power lens, a second negative focal power lens, a third negative focal power lens, a first positive focal power lens, a second positive focal power lens, a fourth negative focal power lens and a third positive focal power lens which are sequentially arranged from an object side to an image side;
the lens satisfies the following conditions:
3.2<(tan(FOV/3))*f<4.0；
wherein, FOV is the angle of view of the lens, f is the focal length of the lens;
the focal length f1 of the first negative focal power lens is more than or equal to-9.7, the focal length f4 of the first positive focal power lens is more than or equal to 4.9, and the focal length f6 of the fourth negative focal power lens is more than or equal to-4.
2. The lens of claim 1 wherein the first negative power lens comprises a meniscus lens;
the second negative power lens comprises a meniscus lens;
the third negative power lens comprises a biconcave lens;
the first positive power lens includes a biconvex lens;
the second positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the third positive power lens includes a biconvex lens.
3. The lens barrel as claimed in claim 2, wherein a surface of the first negative power lens facing the image side is a concave surface; the surface of the second negative focal power lens facing the image side is a concave surface.
4. The lens of claim 1, wherein the abbe number Vd2 of the second negative power lens is equal to or greater than 55; the Abbe number Vd3 of the third negative focal power lens is more than or equal to 25; the Abbe number Vd5 of the second positive focal power lens is more than or equal to 55.
5. The lens of claim 1 wherein the refractive index Nd1 of the first negative power lens is 1.8 or less; the refractive index Nd3 of the third negative focal power lens is less than or equal to 1.65; the refractive index Nd5 of the second positive focal power lens is more than or equal to 1.55; the refractive index Nd6 of the fourth negative focal power lens is less than or equal to 1.65.
6. The lens of claim 1, wherein a stop is disposed between the first positive power lens and the second positive power lens.
7. The lens of claim 6 wherein the aperture stop comprises an aperture stop.
8. The lens barrel as claimed in claim 1, wherein an image side of the third positive power lens is provided with a filter.
9. The lens of claim 8 wherein an image side of the filter is provided with an imaging plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110533429.7A CN113325548B (en) | 2021-05-17 | 2021-05-17 | Lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110533429.7A CN113325548B (en) | 2021-05-17 | 2021-05-17 | Lens |
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| Publication Number | Publication Date |
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| CN113325548A CN113325548A (en) | 2021-08-31 |
| CN113325548B true CN113325548B (en) | 2024-04-12 |
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| CN202110533429.7A Active CN113325548B (en) | 2021-05-17 | 2021-05-17 | Lens |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008134494A (en) * | 2006-11-29 | 2008-06-12 | Topcon Corp | Super wide angle optical system and imaging lens device |
| CN110412727A (en) * | 2018-04-28 | 2019-11-05 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN210626760U (en) * | 2019-08-21 | 2020-05-26 | 浙江大华技术股份有限公司 | Lens |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180064179A (en) * | 2016-12-05 | 2018-06-14 | 삼성전기주식회사 | Image Capturing Lens System |
| WO2019205944A1 (en) * | 2018-04-28 | 2019-10-31 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging device |
| WO2019234800A1 (en) * | 2018-06-04 | 2019-12-12 | 日精テクノロジー株式会社 | Imaging optical system and imaging device including same |
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2021
- 2021-05-17 CN CN202110533429.7A patent/CN113325548B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008134494A (en) * | 2006-11-29 | 2008-06-12 | Topcon Corp | Super wide angle optical system and imaging lens device |
| CN110412727A (en) * | 2018-04-28 | 2019-11-05 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN210626760U (en) * | 2019-08-21 | 2020-05-26 | 浙江大华技术股份有限公司 | Lens |
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