CN109324400B - Compact-structure 2-time high-definition zoom glass-plastic lens and imaging method thereof - Google Patents
Compact-structure 2-time high-definition zoom glass-plastic lens and imaging method thereof Download PDFInfo
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- CN109324400B CN109324400B CN201811402442.3A CN201811402442A CN109324400B CN 109324400 B CN109324400 B CN 109324400B CN 201811402442 A CN201811402442 A CN 201811402442A CN 109324400 B CN109324400 B CN 109324400B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 16
- 230000005499 meniscus Effects 0.000 claims abstract description 57
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 230000004075 alteration Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000004297 night vision Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
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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
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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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
- G02B13/18—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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Abstract
The invention relates to a compact 2-time high-definition zoom glass-plastic lens and an imaging method thereof, wherein an optical system of the lens comprises a front group of lenses A with negative focal power and a rear group of lenses B with positive focal power, which are sequentially arranged from front to back along an incident light path, and the front group of lenses A comprises a meniscus lens A-1, a biconcave lens A-2 and a meniscus lens A-3, which are sequentially arranged from front to back; the rear lens group B comprises a biconvex lens B-1, a first aspheric lens B-2, a second aspheric lens B-3, a meniscus lens B-4 and a meniscus lens B-5 which are sequentially arranged from front to back. The invention has simple and reasonable structure, can realize high resolution, zero temperature drift, day and night confocal, compact structure and multi-point zooming, and can be matched with CCD or CMOS below 600 ten thousand.
Description
Technical field:
the invention relates to a compact-structure 2-time high-definition zoom glass-plastic lens and an imaging method thereof.
The background technology is as follows:
various 2-fold zoom lenses are applied to security systems in the prior art. However, since glass spherical designs are mostly used, it is difficult for the lens to satisfy market demands in terms of pixels, performance and cost, and at the same time, the structure is complicated, and it is difficult to realize the desire that the zoom lens can be light and small. In order to improve the performance and pixels, more glass lenses are used to achieve higher definition image quality, so that the product cost is greatly increased, and the product popularization difficulty is improved. At present, in the security industry, the high-definition multi-point zoom lens with low cost, high image quality, low temperature drift and compact structure is truly provided.
The invention comprises the following steps:
the invention aims to provide the 2-time high-definition zoom glass-plastic lens with a compact structure and an imaging method thereof, aiming at the defects, and the lens is simple and reasonable in structure, and is efficient and convenient.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the optical system of the lens comprises a front group of lenses A with negative focal power and a rear group of lenses B with positive focal power, which are sequentially arranged along an incident light path from front to back, wherein the front group of lenses A comprises a meniscus lens A-1, a biconcave lens A-2 and a meniscus lens A-3, which are sequentially arranged from front to back; the rear lens group B comprises a biconvex lens B-1, a first aspheric lens B-2, a second aspheric lens B-3, a meniscus lens B-4 and a meniscus lens B-5 which are sequentially arranged from front to back.
Further, the air space between the meniscus lens A-1 and the biconcave lens A-2 is 4.05mm, the air space between the biconcave lens A-2 and the meniscus lens A-3 is 0.1mm, the air space between the meniscus lens A-3 and the biconvex lens B-1 is 8.76mm, the air space between the biconvex lens B-1 and the first aspheric lens B-2 is 0.55mm, the air space between the first aspheric lens B-2 and the second aspheric lens B-3 is 0.1mm, the air space between the second aspheric lens B-3 and the meniscus lens B-4 is 0.45mm, and the air space between the meniscus lens B-4 and the meniscus lens B-5 is 0.1mm.
Further, the focal length of the optical system of the lens is f, and the focal lengths corresponding to the meniscus lens A-1, the biconcave lens A-2, the meniscus lens A-3, the biconvex lens B-1, the first aspheric lens B-2, the second aspheric lens B-3, the meniscus lens B-4 and the meniscus lens B-5 are f1, f2, f3, f4, f5, f6, f7 and f8 respectively; wherein f1, f2, f3, f4, f5, f6, f7, f8 and f satisfy the following ratios: -3<
<-2；-4</>
<-3；4</>
<5；4</>
<5；2</>
<3；-3</>
<-2；5</>
<6；5</>
<6。
Further, the f5 and f6 conditions must be satisfied: -1.2<
<-0.6。
Further, the first aspheric lens B-2 and the second aspheric lens B-3 are made of plastic materials.
Further, a filter is further arranged on the rear side of the meniscus lens B-5.
The invention adopts another technical scheme that: the working method of the compact 2-time high-definition zoom glass plastic lens adopts the compact 2-time high-definition zoom glass plastic lens, and when the lens works, an optical path sequentially enters a front group of lenses A and a rear group of lenses B for imaging.
Compared with the prior art, the invention has the following effects: (1) According to the invention, spherical aberration and chromatic aberration are corrected by separating the two aspheric surfaces in the rear group lens, the air gap of the two aspheric surfaces compensates for advanced aberration, and each aspheric surface is reasonably calculated so that the focus is not offset in a high-temperature and low-temperature environment, and the effect of day and night focusing is achieved. (2) The invention utilizes the aspheric surface technology to improve the precision and simplify the structure, realizes the high-definition shooting level with ultra-low cost, not only can reach high-quality pixels in daytime, but also has high-definition image quality under the condition of insufficient light or night, and can still form perfect images in severe environments with different temperatures; (3) The invention has simple and reasonable structure, solves the problems that the prior 2-time zoom lens has insufficient definition, the cost is increased due to the adoption of a multi-lens structure, and the structure is complex, so that the light and small-sized zoom lens cannot be realized.
Description of the drawings:
FIG. 1 is a schematic diagram of a short-focus optical system in an embodiment of the invention;
FIG. 2 is a schematic diagram of a tele optical system in an embodiment of the present invention;
FIG. 3 is a graph of MTF for the best case of short focal focusing such that the center field of view of visible light is image quality in an embodiment of the present invention;
FIG. 4 is a night vision MTF diagram corresponding to the best condition of the center field of view image quality of the visible light due to the short focal length focusing in the embodiment of the invention;
FIG. 5 is a graph of MTF for the case where the focus of the tele is such that the image quality of the center field of view of the visible light is optimal in an embodiment of the present invention;
fig. 6 is a night vision MTF plot for a case where the focus of the tele is such that the image quality of the center field of view of the visible light is optimal in an embodiment of the present invention.
In the figure:
a-front group lens A; a-1: a meniscus lens A-1; a-2: biconcave lens A-2; a-3: a meniscus lens A-3; b-rear group lens B; b-1: a lenticular lens B-1; b-2: a first aspherical lens B-2; b-3: a second aspherical lens B-3; b-4: a meniscus lens B-4; b-5: a meniscus lens B-5; a C-filter.
The specific embodiment is as follows:
the invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1 to 6, the optical system of the compact 2-fold high-definition zoom glass-plastic lens comprises a front group of lenses A with negative focal power and a rear group of lenses B with positive focal power, which are sequentially arranged from front to back along an incident light path, wherein the front group of lenses A comprises a meniscus lens A-1, a biconcave lens A-2 and a meniscus lens A-3, which are sequentially arranged from front to back; the rear lens group B comprises a biconvex lens B-1, a first aspheric lens B-2, a second aspheric lens B-3, a meniscus lens B-4 and a meniscus lens B-5 which are sequentially arranged from front to back, and an optical filter is further arranged on the rear side of the meniscus lens B-5.
In this embodiment, the air gap between the meniscus lens A-1 and the biconcave lens A-2 is 4.05mm, the air gap between the biconcave lens A-2 and the meniscus lens A-3 is 0.1mm, the air gap between the meniscus lens A-3 and the biconvex lens B-1 is 8.76mm, the air gap between the biconvex lens B-1 and the first aspheric lens B-2 is 0.55mm, the air gap between the first aspheric lens B-2 and the second aspheric lens B-3 is 0.1mm, the air gap between the second aspheric lens B-3 and the meniscus lens B-4 is 0.45mm, and the air gap between the meniscus lens B-4 and the meniscus lens B-5 is 0.1mm.
In this embodiment, the focal length of the optical system of the lens is f, and the focal lengths of the meniscus lens A-1, the biconcave lens A-2, the meniscus lens A-3, the biconvex lens B-1, the first aspheric lens B-2, the second aspheric lens B-3, the meniscus lens B-4 and the meniscus lens B-5 are f1, f2, f3, f4, f5, f6, f7 and f8 respectively; wherein f1, f2, f3, f4, f5, f6, f7, f8 and f satisfy the following ratios: -3<
<-2；-4</>
<-3；4</>
<5；4</>
<5；2</>
<3；-3</>
<-2；5</>
<6；5</>
<6. The focal power of the lens is reasonably distributed according to the proportion, and each lens is in a certain proportion relative to the focal length f of the system, so that the aberration of the lens in the wavelength range of 420-850 nm is obtainedReasonable correction and balance.
In this embodiment, the f5 and f6 requirements must be satisfied: -1.2<
<-0.6. The lens can clearly image at high temperature and low temperature, so that the temperature drift is zero, high-definition imaging can be realized under severe temperature conditions, defocus is avoided, and the focal length and focal power ratio of the two aspheric surfaces of the rear group must meet the conditions.
In this embodiment, the first aspheric lens B-2 and the second aspheric lens B-3 are made of plastic materials.
In this embodiment, the front lens group a has negative power to correct the positive power aberration of the rear lens group B, and the two aspherical lenses in the rear lens group B correct all the higher order aberrations. The whole lens ensures the approximate proportion distribution of the refractive index and the focal power of the lens, and ensures the balance of the incident angles of the front lens group and the rear lens group so as to reduce the sensitivity of the lens and improve the possibility of production. By reasonably distributing the focal length of each lens, the spherical aberration and the field curvature of the imaging system are small at the same time, and the image quality of the axial and off-axis visual fields is ensured. The total length of the optical path is shorter through the optical system formed by the lenses, so that the size of the lens is small; the back focus is large, and the camera with various interfaces can be matched for use. The first aspheric lens B-2 and the second aspheric lens B-3 are two plastic aspheric surfaces, so that the image quality is good, and the cost is low; the front group of lenses A have negative focal power, and the rear group of lenses B have positive focal power, so that the lens can be used normally in high and low temperature environments. The front lens group with negative focal power formed by the meniscus lens A-1, the biconcave lens A-2 and the meniscus lens A-3 serves as a compensation group of the whole zoom lens, the rear lens group with positive focal power formed by the biconvex lens B-1, the first aspheric surface B-2, the second aspheric surface B-3, the meniscus lens B-4 and the meniscus lens B-5 serves as a zoom group of the whole zoom lens, when the zoom group moves towards the diaphragm direction, the focus of the whole lens moves, the zoom is realized, and meanwhile, the compensation group also starts to move towards the diaphragm direction to compensate the movement amount of the image surface after the zoom is realized. Meanwhile, the position of the image plane can be clearly imaged. In this embodiment, the focal length can be varied from 3.1mm to 6.2mm by changing the magnification and moving the compensation group, while the image plane is kept clearly imaged, and 2-fold zooming is achieved.
In this embodiment, the parameters of each lens are shown in the following table:
the optical system composed of the lenses achieves the following optical indexes:
(1) Short Jiao Jiaoju: f=3.1 mm; length Jiao Jiaoju: f=6.2 mm;
(2) Short focal relative aperture f=2.0; long focal relative aperture f=2.6;
(3) Short focal field angle: 2w is more than or equal to 140 degrees; angle of field of tele: 2w is more than or equal to 60 degrees (the image field of view 2 eta' is more than or equal to phi 6.9 mm);
(4) Short focal TV distortion: -14%; tele TV distortion: 2.2% below;
(5) Resolution ratio: can be matched with a 600 ten thousand-pixel high-resolution CCD or CMOS camera;
(6) The total length sigma of the light path is less than or equal to 31mm, and the optical rear intercept L' is less than or equal to 4mm;
(7) The applicable spectral line range: 420 nm-850 nm.
In this embodiment, as can be seen from the MTF chart (shown in FIG. 3) in which the focus of the short focus makes the image quality of the center field of view of the visible light optimal, the spatial frequency in the chart is 120lp/mm, the MTF is greater than 0.3, and the imaging is excellent. From a night vision MTF chart (shown in fig. 4) corresponding to the best condition of the image quality of the visible light center view field due to short-focus focusing, the space frequency in the chart is 120lp/mm, the MTF is larger than 0.3, and the imaging is excellent. From the MTF diagram (shown in FIG. 5) under the condition that the focus of the long focus enables the image quality of the visible light center view field to be optimal, the space frequency in the diagram is 120lp/mm, the MTF is larger than 0.3, and the imaging is excellent; the night vision MTF chart (shown in fig. 6) corresponding to the best visible light center view field image quality is focused from the long focus, the spatial frequency of the chart is 120lp/mm, the MTF is larger than 0.3, and the imaging is excellent.
The invention has the advantages that: the plastic aspherical lens has the advantages that the plastic aspherical lens is simple in structure and small in size, the high-definition shooting level is realized by using ultra-low cost, 2 times of zooming is realized by using the movement of the zoom group and the compensation group, the focal power is reasonably distributed, imaging can still be completed in severe environments with different temperatures, the aspherical positions are skillfully arranged, and meanwhile, the thinnest aperture is configured, so that the structural ultra-small zoom lens is realized.
The invention adopts another technical scheme that: the working method of the compact 2-time high-definition zoom glass plastic lens adopts the compact 2-time high-definition zoom glass plastic lens, and when the lens works, an optical path sequentially enters a front group of lenses A and a rear group of lenses B for imaging.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (4)
1. A compact structure 2 times high definition zoom glass plastic lens is characterized in that: the optical system of the lens comprises a front group of lenses A with negative focal power and a rear group of lenses B with positive focal power, which are sequentially arranged from front to back along an incident light path, wherein the front group of lenses A comprises a meniscus lens A-1, a biconcave lens A-2 and a meniscus lens A-3, which are sequentially arranged from front to back; the rear lens group B comprises a biconvex lens B-1, a first aspheric lens B-2, a second aspheric lens B-3, a meniscus lens B-4 and a meniscus lens B-5 which are sequentially arranged from front to back;
the focal length of the optical system of the lens is f, and the focal lengths corresponding to the meniscus lens A-1, the biconcave lens A-2, the meniscus lens A-3, the biconvex lens B-1, the first aspheric lens B-2, the second aspheric lens B-3, the meniscus lens B-4 and the meniscus lens B-5 are f1, f2, f3, f4, f5, f6, f7 and f8 respectively; wherein f1, f2, f3, f4, f5, f6, f7, f8 and f satisfy the following ratios: -3<
<-2；-4<
<-3；4<
<5；4<
<5；2<
<3；-3<
<-2；5<
<6；5<
<6, preparing a base material; the f5 and f6 fills must satisfy: -1.2<
<-0.6；
The rear side of the meniscus lens B-5 is also provided with an optical filter.
2. The compact 2-fold high-definition zoom glass-plastic lens according to claim 1, wherein: the air space between the meniscus lens A-1 and the biconcave lens A-2 is 4.05mm, the air space between the biconcave lens A-2 and the meniscus lens A-3 is 0.1mm, the air space between the meniscus lens A-3 and the biconvex lens B-1 is 8.76mm, the air space between the biconvex lens B-1 and the first aspheric lens B-2 is 0.55mm, the air space between the first aspheric lens B-2 and the second aspheric lens B-3 is 0.1mm, the air space between the second aspheric lens B-3 and the meniscus lens B-4 is 0.45mm, and the air space between the meniscus lens B-4 and the meniscus lens B-5 is 0.1mm.
3. The compact 2-fold high-definition zoom glass-plastic lens according to claim 1, wherein: the first aspheric lens B-2 and the second aspheric lens B-3 are made of plastic materials.
4. An imaging method of a compact-structure 2-time high-definition zoom glass plastic lens is characterized by comprising the following steps of: a compact 2-fold high-definition zoom glass-plastic lens according to any one of claims 1-3, wherein, in operation, an optical path sequentially enters a front lens group a and a rear lens group B for imaging.
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| CN110346900A (en) * | 2019-06-28 | 2019-10-18 | 福建福光股份有限公司 | A kind of 2 times of high definition zoom glass modeling camera lenses of compact type and its imaging method |
| CN110727091A (en) * | 2019-11-11 | 2020-01-24 | 福建福光股份有限公司 | Super-economical glass-plastic mixed 4K zooming optical system |
| CN112346230B (en) * | 2020-11-30 | 2024-08-09 | 福建福光天瞳光学有限公司 | High-resolution large-target-surface 4-10mm day-night zoom monitoring lens and imaging method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008304777A (en) * | 2007-06-08 | 2008-12-18 | Konica Minolta Opto Inc | Variable power optical system, image pickup apparatus, and digital equipment |
| CN106990515A (en) * | 2016-12-16 | 2017-07-28 | 嘉兴中润光学科技有限公司 | A kind of zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI507727B (en) * | 2013-04-30 | 2015-11-11 | Young Optics Inc | Zoom lens |
| CN104360466B (en) * | 2014-11-18 | 2017-04-12 | 中山联合光电科技有限公司 | Small-size, low-cost, low-temperature-excursion and high-resolution zooming optical system |
| CN104965298B (en) * | 2015-06-30 | 2017-08-29 | 东莞市宇瞳光学科技股份有限公司 | A kind of wide-angle zoom lens of small volume |
| CN105259646B (en) * | 2015-11-06 | 2017-12-22 | 福建福光股份有限公司 | 2.8 8mm miniature zoom lens |
| CN209070211U (en) * | 2018-11-23 | 2019-07-05 | 福建福光股份有限公司 | A kind of 2 times of high definition zoom glass modeling camera lenses of compact type |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008304777A (en) * | 2007-06-08 | 2008-12-18 | Konica Minolta Opto Inc | Variable power optical system, image pickup apparatus, and digital equipment |
| CN106990515A (en) * | 2016-12-16 | 2017-07-28 | 嘉兴中润光学科技有限公司 | A kind of zoom lens |
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