CN109031625B - Large-aperture day and night dual-purpose five-million-pixel-level high-definition monitoring lens - Google Patents
Large-aperture day and night dual-purpose five-million-pixel-level high-definition monitoring lens Download PDFInfo
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- CN109031625B CN109031625B CN201811116064.2A CN201811116064A CN109031625B CN 109031625 B CN109031625 B CN 109031625B CN 201811116064 A CN201811116064 A CN 201811116064A CN 109031625 B CN109031625 B CN 109031625B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 230000003287 optical effect Effects 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 26
- 230000004075 alteration Effects 0.000 abstract description 19
- 238000003384 imaging method Methods 0.000 abstract description 10
- 238000005286 illumination Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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Abstract
The invention discloses a large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens which is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens from an object side. The large-aperture day and night dual-purpose five-megapixel high-definition monitoring lens adopts a structure of 9 groups of 11 lenses, namely, negative, positive, negative, positive and negative, with focal powers, and the fifth lens and the seventh lens are cemented lenses, so that the structure is compact, chromatic aberration and spherical aberration are corrected, field curvature is further corrected through the eighth lens and the ninth lens, the imaging quality is greatly improved, and high-definition requirements can be still met even in a large aperture.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a large-aperture day and night dual-purpose five-million-pixel-level high-definition monitoring lens.
Background
The closed circuit monitoring television (CCTV for short) system is used as a security technology, plays more and more important roles in places such as star hotels, office buildings, banks, government offices and the like, and comprises that the CCTV system is also used as an important means for security and property management in the current intelligent residential quarter.
With the rapid rise of the security monitoring market and the optimized improvement of digital processing and network transmission speed in recent years, the quality requirement of the security monitoring lens is greatly improved, and the identification is carried out from the common monitoring requirement to high definition. Monitoring is required from only day to day and night.
In order to make the CCTV technology play a better role, in each closed-circuit television monitoring project, the correct selection of the lens is very important for economic indicators and technical performance, and if a fixed scene needs continuous monitoring day and night, a five-million-pixel high-definition prime lens for day and night is not selected. The lens has the advantages of high response speed, stable imaging quality and high-definition image quality, and provides richer details. However, the common fixed-focus monitoring lens is mainly designed under the condition of visible light in the daytime, the problem of confocal of visible light and near infrared light is not considered due to the small clear aperture, so that when only invisible infrared light of human eyes is provided at night, the image is dark and blurred, and the night monitoring requirement cannot be met; the conventional lens does not consider near infrared wave band in general calculation, only improves the brightness of night imaging by increasing the light transmission amount of the lens, and further the aperture of the lens is larger, which causes the chromatic aberration and off-axis aberration of the system to be difficult to correct, and the poor image quality of a large-aperture lens becomes a difficult point of lens design, so that how to design a fixed-focus monitoring lens which can be used for day and night and can clearly image is very necessary.
Disclosure of Invention
The invention aims to provide a large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens, which solves the problems that the conventional lens does not consider near-infrared wave bands in general calculation, only improves the brightness of night imaging by increasing the light transmission quantity of the lens, further has larger aperture, easily causes system chromatic aberration and off-axis chromatic aberration to be difficult to correct, and the large-aperture lens has poor image quality.
In order to solve the technical problems, the invention adopts the following technical scheme:
a high-definition monitoring lens with a large aperture and five million-pixel levels for day and night use is provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens in sequence from an object side;
the first lens is a crescent spherical lens having a negative optical power;
the second lens is a crescent spherical lens having a negative optical power;
the third lens is a crescent spherical lens having a positive optical power;
the fourth lens is a biconcave spherical lens having negative optical power;
the fifth lens is a cemented lens having negative optical power composed of a biconcave spherical lens having negative optical power and a biconvex spherical lens having positive optical power;
the sixth lens is a biconvex spherical lens having a positive optical power;
the seventh lens is a cemented lens having positive power composed of a crescent spherical lens having positive power and a biconvex spherical lens having positive power;
the eighth lens is a biconvex spherical lens having a positive optical power;
the ninth lens is a biconcave spherical lens having negative optical power.
Preferably, the seventh lens is provided with a diaphragm element, and the diaphragm element is arranged on a mirror surface of the crescent spherical lens in the seventh lens, which is close to the sixth lens.
Preferably, the fourth lens concave surface is opposite and adjacent to the fifth lens concave surface.
Preferably, the first lens satisfies the following condition: nd is less than or equal to 1.55, and Vd is more than or equal to 63, wherein Nd represents the d-light refractive index of the first lens material, and Vd represents the d-light Abbe constant of the first lens material.
Preferably, the third lens satisfies the following condition: nd is more than or equal to 1.85 and more than or equal to 1.7, and Vd is more than or equal to 30 and more than or equal to 20, wherein Nd represents the d-light refractive index of the third lens material, and Vd represents the d-light Abbe constant of the third lens material.
Preferably, the fourth lens satisfies the following condition: nd is more than or equal to 1.65, and Vd is less than or equal to 35, wherein Nd represents the d-light refractive index of the fourth lens material, and Vd represents the d-light Abbe constant of the fourth lens material.
Preferably, the sixth lens satisfies the following condition: nd is more than or equal to 1.65, and Vd is less than or equal to 50, wherein Nd represents the d-light refractive index of the sixth lens material, and Vd represents the d-light Abbe constant of the sixth lens material.
Preferably, the space between the first lens and the second lens, the space between the second lens and the third lens, the space between the fourth lens and the fifth lens, the space between the fifth lens and the sixth lens, the space between the sixth lens and the seventh lens, the space between the seventh lens and the eighth lens, and the space between the eighth lens and the ninth lens are all tightly fitted with a spacer.
Compared with the prior art, the invention has the beneficial effects that:
the high-definition monitoring lens with five million pixels for day and night use with the large aperture has a structure of 11 lenses with 9 groups of negative, positive, negative, positive and negative focal powers in sequence, the fifth lens and the seventh lens are cemented lenses, the structure is compact by reasonably distributing the focal powers, chromatic aberration and spherical aberration are corrected, and the field curvature is further corrected by the eighth lens and the ninth lens, so that the imaging quality is greatly improved by the lens structure, and the high-definition requirement can be still met even when the large aperture is large.
In the optical design, the spectral range is 486nm-900nm, the clear aperture F # -1.4, and the wave aberration is corrected under the condition of ensuring the field angle, so that the system realizes day and night confocal, namely confocal in the spectral range 486nm-900 nm; meanwhile, the low-illumination COMS with the specification of 2560 multiplied by 2160@6.5 mu m is selected, and the imaging quality of five million pixels observed at day and night is realized without auxiliary illumination of a near infrared lamp.
The optical lens is made of spherical glass, is made of common materials and contains few impurities, so that the high-efficiency process and the low cost are achieved on the basis of pursuing monitoring range, imaging definition and high resolution; meanwhile, even in a low-illumination environment or a night environment, the image can achieve high quality, namely five million pixels; the method can be widely applied to various places and is a mainstream product of a monitoring imaging system.
Drawings
FIG. 1 is a schematic view of the lens distribution of the present invention.
FIG. 2 is a system diagram of the invention.
Fig. 3 is a graph of MTF (modulation transfer function) of the present invention.
Fig. 4 is a graph of astigmatism and distortion for the present invention.
Fig. 5 is a tolerance curve of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the optical lens of the present invention is shown in fig. 1, and is used in an outdoor middle-distance and long-distance security monitoring system. The lens is provided with the following components in sequence from an object side: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, and an image plane IMA. The respective mirror surfaces are numbered in order from the object side, the mirror surfaces of the first lens 1 are r1 and r2, the mirror surfaces of the second lens 2 are r3 and r4, the mirror surfaces of the third lens 3 are r5 and r6, the mirror surfaces of the fourth lens 4 are r7 and r8, the mirror surfaces of the fifth lens 5 are r9, r10 and r11, the mirror surfaces of the sixth lens 6 are r12 and r13, the mirror surfaces of the seventh lens 7 are r14, r15 and r16, the mirror surfaces of the eighth lens 8 are r17 and r18, and the mirror surfaces of the ninth lens 9 are r19 and r 20.
The first lens 1 is a crescent spherical lens having negative optical power;
the second lens 2 is a crescent spherical lens having negative power;
the third lens 3 is a crescent spherical lens having a positive power;
the fourth lens 4 is a biconcave spherical lens having negative optical power;
the fifth lens 5 is a cemented lens having negative power composed of a biconcave spherical lens having negative power and a biconvex spherical lens having positive power;
the sixth lens 6 is a biconvex spherical lens having a positive optical power;
the seventh lens 7 is a cemented lens having positive power composed of a crescent spherical lens having positive power and a biconvex spherical lens having positive power;
a diaphragm element disposed on a first surface of the seventh lens, i.e., on a mirror surface r14 of the seventh lens;
the eighth lens 8 is a biconvex spherical lens having a positive optical power;
the ninth lens 9 is a biconcave spherical lens having negative optical power.
The high-definition monitoring lens with five million pixels for day and night use with the large aperture in the embodiment adopts a structure of 9 groups of 11 lenses with focal powers of negative, positive, negative, positive and negative in sequence, the fifth lens and the seventh lens are cemented lenses, and through reasonable distribution of the focal powers, the structure is compact, chromatic aberration and spherical aberration are corrected, and curvature of field is further corrected through the eighth lens and the ninth lens, so that the lens structure greatly improves imaging quality, and high-definition requirements can be still met even when the large aperture is large.
The optical lens in the embodiment is made of spherical glass, is made of common materials and contains few impurities, so that a more efficient process and lower cost are achieved on the basis of pursuing monitoring range, imaging definition and high resolution; meanwhile, the image can achieve high quality even in a low-illumination environment or a night environment, namely five million pixels.
Further, the concave surface r8 of the fourth lens 4 is opposite to and adjacent to the concave surface r9 of the fifth lens 5. The concave surface is opposite and adjacent to the optical structure form, and is mainly used for eliminating or reducing coma aberration (one kind of aberration) in the optical system.
Furthermore, the diaphragm is positioned on the diaphragm element and arranged on the first surface of the seventh lens, so that the correction of large-aperture band aberration is facilitated; the eighth lens 8 and the ninth lens 9 have a thickness for correcting curvature of field.
A more preferred embodiment for this example is as follows:
the first lens 1 satisfies the following condition: nd is less than or equal to 1.55, and Vd is more than or equal to 63, wherein Nd represents the d-light refractive index of the material of the first lens 1, and Vd represents the d-light Abbe constant of the material of the first lens 1.
The third lens 3 satisfies the following condition: nd is more than or equal to 1.85 and more than or equal to 1.7, and Vd is more than or equal to 30 and more than or equal to 20, wherein Nd represents the d-light refractive index of the material of the third lens 3, and Vd represents the d-light Abbe constant of the material of the third lens 3.
The fourth lens 4 satisfies the following condition: nd is more than or equal to 1.65, and Vd is less than or equal to 35, wherein Nd represents the d-light refractive index of the material of the fourth lens 4, and Vd represents the d-light Abbe constant of the material of the fourth lens 4.
The sixth lens 6 satisfies the following condition: nd is more than or equal to 1.65, and Vd is less than or equal to 50, wherein Nd represents the d-light refractive index of the material of the sixth lens 6, and Vd represents the d-light Abbe constant of the material of the sixth lens 6.
The first lens and the third lens are meniscus lenses and have the functions of compressing light and correcting chromatic aberration; the fourth lens is a biconcave lens and is used for increasing the divergence angle of the converged light and reducing spherical aberration and chromatic aberration; the sixth lens is a biconvex lens, which can significantly reduce spherical aberration and improve coma and distortion. If the refractive index and abbe constant of the lens are out of the ranges, the optical system cannot achieve satisfactory image quality.
And the space between the first lens and the second lens, the space between the second lens and the third lens, the space between the fourth lens and the fifth lens, the space between the fifth lens and the sixth lens, the space between the sixth lens and the seventh lens, the space between the seventh lens and the eighth lens and the space between the eighth lens and the ninth lens are tightly matched through space rings. Can be so that reach optical system tolerance requirement when the assembly camera lens through the spacer ring tight fit for the assembly methods is simple and easy, can also reach the effect of design simultaneously.
In this embodiment, the preferable parameter values of the optical lens, which are EFL (overall focal length value), F # (aperture value), FOV (field angle), TTL (total lens length), and WL (wavelength range), are as follows:
EFL 36mm, F1.4, FOV 37 °, TTL 140mm, WL 486-900 nm
The values of the corresponding elements are shown in the following table
Fig. 2 to 5 are graphs of optical correlation performance of the present embodiment, in which fig. 2 is a dot diagram of the system in micrometers (μm). Fig. 3 is a graph of MTF (modulation transfer function) representing the integrated resolution level of an optical system. Fig. 4 is a graph of astigmatism and distortion in mm, which is represented by the wavelength of a common F, D, C three-color light, and the distortion curve represents the value of the distortion magnitude in% for different angles of view. Fig. 5 is a tolerance graph showing the tolerances of an optical system, which determine the ease of assembly of the system. As can be seen, the optical lens has corrected various aberrations and tolerances to a good level.
Through experiments, the lens of the invention is 1 × 10-2Under the LUX illumination condition, a person with the length of 200 meters and a vehicle with the length of 500 meters can be distinguished.
Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (8)
1. The utility model provides a high definition monitoring lens of dual-purpose five million pixel levels of large aperture day night which characterized in that: a first lens (1), a second lens (2), a third lens (3), a fourth lens ((4), a fifth lens (5), a sixth lens (6), a seventh lens (7), and an eighth lens are sequentially arranged from the object side
(8) A ninth lens ((9);
the first lens (1) is a crescent spherical lens having a negative optical power;
the second lens (2) is a crescent spherical lens having a negative optical power;
the third lens (3) is a crescent spherical lens having a positive optical power;
the fourth lens (4) is a biconcave spherical lens having a negative optical power;
the fifth lens (5) is a cemented lens with negative optical power composed of a biconcave spherical lens with negative optical power and a biconvex spherical lens with positive optical power;
the sixth lens (6) is a biconvex spherical lens having a positive optical power;
the seventh lens (7) is a cemented lens having positive power composed of a crescent spherical lens having positive power and a biconvex spherical lens having positive power;
the eighth lens (8) is a biconvex spherical lens having a positive optical power;
the ninth lens (9) is a biconcave spherical lens having a negative optical power.
2. The large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens according to claim 1, which is characterized in that: a diaphragm element is arranged on the seventh lens (7),
the diaphragm element is arranged on the mirror surface of the crescent spherical lens in the seventh lens (7) close to the sixth lens (6).
3. The large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens according to claim 1, which is characterized in that: the concave surface of the fourth lens (4) is opposite to and adjacent to the concave surface of the fifth lens (5).
4. The large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens according to claim 1, which is characterized in that: the first lens (1) satisfies the following conditions: nd is less than or equal to 1.55, and Vd is more than or equal to 63, wherein Nd represents the d-light refractive index of the material of the first lens (1), and Vd represents the d-light Abbe constant of the material of the first lens (1).
5. The large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens according to claim 1, which is characterized in that: the third lens (3) satisfies the following condition: 1.85 is more than or equal to Nd and more than or equal to 1.7, and 30 is more than or equal to Vd and more than or equal to 20, wherein Nd represents the d-light refractive index of the material of the third lens (3), and Vd represents the d-light Abbe constant of the material of the third lens (3).
6. The large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens according to claim 1, which is characterized in that: the fourth lens (4) satisfies the following condition: nd is more than or equal to 1.65, and Vd is less than or equal to 35, wherein Nd represents the d-light refractive index of the material of the fourth lens (4), and Vd represents the d-light Abbe constant of the material of the fourth lens (4).
7. The large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens according to claim 1, which is characterized in that: the sixth lens (6) satisfies the following condition: nd is more than or equal to 1.65, and Vd is less than or equal to 50, wherein Nd represents the d-light refractive index of the material of the sixth lens (6), and Vd represents the d-light Abbe constant of the material of the sixth lens (6).
8. The large-aperture day and night dual-purpose five-megapixel-level high-definition monitoring lens according to claim 1, which is characterized in that: and the space between the first lens (1) and the second lens (2), between the second lens (2) and the third lens (3), between the fourth lens ((4) and the fifth lens (5), between the fifth lens (5) and the sixth lens (6), between the sixth lens (6) and the seventh lens (7), between the seventh lens (7) and the eighth lens (8), and between the eighth lens (8) and the ninth lens (9) are tightly matched through space rings.
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| CN201811116064.2A CN109031625B (en) | 2018-09-25 | 2018-09-25 | Large-aperture day and night dual-purpose five-million-pixel-level high-definition monitoring lens |
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| CN201811116064.2A CN109031625B (en) | 2018-09-25 | 2018-09-25 | Large-aperture day and night dual-purpose five-million-pixel-level high-definition monitoring lens |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02256011A (en) * | 1988-12-08 | 1990-10-16 | Nikon Corp | Zoom lens system |
| JPH07159689A (en) * | 1993-12-09 | 1995-06-23 | Olympus Optical Co Ltd | Optical system for amphibious camera |
| JP2011175161A (en) * | 2010-02-25 | 2011-09-08 | Tamron Co Ltd | Zoom lens |
| CN104238086A (en) * | 2013-06-17 | 2014-12-24 | 富士胶片株式会社 | Imaging lens and imaging apparatus |
-
2018
- 2018-09-25 CN CN201811116064.2A patent/CN109031625B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02256011A (en) * | 1988-12-08 | 1990-10-16 | Nikon Corp | Zoom lens system |
| JPH07159689A (en) * | 1993-12-09 | 1995-06-23 | Olympus Optical Co Ltd | Optical system for amphibious camera |
| JP2011175161A (en) * | 2010-02-25 | 2011-09-08 | Tamron Co Ltd | Zoom lens |
| CN104238086A (en) * | 2013-06-17 | 2014-12-24 | 富士胶片株式会社 | Imaging lens and imaging apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 宽光谱日夜两用鱼眼监控镜头的设计;张继艳等;《激光与红外》;20131231;第43卷(第12期);第1389-1392页 * |
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