CN112269238B - Day and night dual-purpose athermal lens with wide illumination range - Google Patents
Day and night dual-purpose athermal lens with wide illumination range Download PDFInfo
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- CN112269238B CN112269238B CN202011218600.7A CN202011218600A CN112269238B CN 112269238 B CN112269238 B CN 112269238B CN 202011218600 A CN202011218600 A CN 202011218600A CN 112269238 B CN112269238 B CN 112269238B
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- 238000005286 illumination Methods 0.000 title claims abstract description 30
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000005304 optical glass Substances 0.000 claims abstract description 27
- 230000005499 meniscus Effects 0.000 claims description 24
- 239000003292 glue Substances 0.000 claims description 18
- 101100405125 Rattus norvegicus Nr4a2 gene Proteins 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 35
- 230000004075 alteration Effects 0.000 abstract description 7
- 238000003384 imaging method Methods 0.000 description 8
- 230000005855 radiation Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 102100023171 Nuclear receptor subfamily 1 group D member 2 Human genes 0.000 description 1
- 108091008770 Rev-ErbAß Proteins 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
- G02B13/0055—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
- 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
- G02B13/18—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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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Abstract
The invention relates to a day and night dual-purpose athermalization lens with a wide illumination range, and belongs to the technical field of optics. The optical system of the lens is sequentially and coaxially provided with a front group [1], an iris diaphragm [2], a rear group [3], a parallel flat plate [4] and an image surface [5] along the light incidence direction; the front group [1] comprises a first gluing group [11], a first single lens [12], a second single lens [13] and a second gluing group [14] which are sequentially arranged along the light incidence direction; the rear group [3] comprises a third gluing group [31] and a fourth gluing group [32] which are sequentially arranged along the light incidence direction. The lens optical systems all use common optical glass, the purpose of achromatization is achieved by optimizing optical system materials and using a double cemented lens, and two high-order aspheric surfaces are introduced to realize large relative aperture and large image plane aberration correction; the invention has the characteristics of compact structure, large aperture, no thermalization and dual-purpose day and night.
Description
Technical Field
The invention belongs to the technical field of optics, and relates to a day and night dual-purpose athermalization lens with a wide illumination range.
Background
In recent years, with the wider application range of the camera lens, the requirement of people on the day and night dual-purpose illumination range of the lens is higher and higher, but the existing lens generally has the defects that: 1, the adaptive spectral range is narrow, the device can be used only under daytime light conditions, and clear imaging can be realized only through infrared supplementary lighting under a low-illumination environment at night; 2 the aperture is small, the requirement of the lowest imaging illumination of the CCD chip can not be met under low illumination, clear imaging can not be realized, and the effect of day and night use is not good.
Generally, human eyes are only sensitive to visible light wave bands, in dark environments such as at night, night radiation includes near infrared radiation besides visible light, a camera lens is matched with a night radiation spectrum and a CCD response wave band, and chromatic aberration needs to be corrected in a wide spectrum range. In addition, according to the image plane illumination formula, the central illumination of the image plane of the lens is proportional to the square of the relative aperture of the lens, in order to obtain sufficient image plane illumination, the lens should have the relative aperture as large as possible, the larger the relative aperture of the lens is, the stronger the light gathering capability is, the more night radiation can be performed by a mobile phone, and the illumination range applicable to the lens is also larger.
The use of a common optical lens is easily affected by the surrounding environment, particularly the temperature, when environmental factors such as the temperature change, many parameters of an optical system, such as the surface type, the interval, the thickness, the material refractive index and the like, change along with the change, and further the optical system is defocused and blurred in imaging, so that the application of the lens in the extreme environment is limited. The optical system for these special application fields must be designed athermally, and the influence of temperature variation on the imaging quality of the system is considered during the design, so that the optical system has good imaging quality in a larger temperature range.
The patent CN103399391B discloses a low-cost athermalized day and night lens and a working method thereof, wherein the working wavelength band of an optical system is 430-850nm, and the F/# is 1.6; the patent CN103399391B discloses a ten million-pixel large-target-surface day and night dual-purpose miniature camera lens, the working wavelength band of an optical system is 480-850nm, and the F/# is 1.5; the patent CN111025601A discloses a wide-angle large-aperture athermalized day and night lens and a using method thereof, wherein the working wavelength band of an optical system is 430-850nm, and the final F/# is 1.4; patent CN209070172U discloses a wide-spectrum low-distortion optical athermalization lens, which corrects chromatic aberration of a wide waveband of 450nm-950nm, and an optical system F/# finally reaches 1.2.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a day and night dual-purpose athermalization lens with a wide illumination range, the lens can be applied to a 400-plus 1000nm wide-band optical system and has an optical athermalization effect, an iris diaphragm 2 can realize that an optical system F/# is continuously adjustable from 1 to 16, and the wide illumination range is 10 -3 lx to 10 5 lx. The optical system of the lens is sequentially and coaxially provided with a front group 1, an iris diaphragm 2, a rear group 3, a parallel flat plate 4 and an image surface 5 along the light incidence direction; the front group 1 comprises a first gluing group 11, a first single lens 12, a second single lens 13 and a second gluing group 14 which are sequentially arranged along the light incidence direction; the rear group 3 includes a third glue group 31 and a fourth glue group 32 sequentially arranged along the light incidence direction. The lens optical system uses common optical glass, achieves the purpose of achromatism by optimizing optical system materials and using a double cemented lens, introduces two high-order aspheric surfaces to realize large relative aperture and large image surface aberration correction Positive; the invention has the characteristics of compact structure, large aperture, no thermalization and dual-purpose day and night.
Technical scheme
A day and night dual-purpose athermalization lens with a wide illumination range is characterized by comprising a front group 1, an iris diaphragm 2, a rear group 3, a parallel flat plate 4 and an image surface 5 which are sequentially arranged along a light incidence direction; the front group 1 is a first gluing group 11, a first single lens 12, a second single lens 13 and a second gluing group 14 which are sequentially arranged along the light incidence direction; the rear group 3 is a third gluing group 31 and a fourth gluing group 32 which are sequentially arranged along the light incidence direction; the first cemented combination 11 is cemented by a first negative meniscus lens 111 and a first positive meniscus lens 112, and the focal power thereof is-0.0074; the second cemented group 14 is cemented by a first biconvex positive lens 141 and a first biconcave negative lens 142, and the focal power thereof is-0.0207; the third cemented group 31 is cemented by a second meniscus negative lens 311 and a second biconvex positive lens 312, and the focal power thereof is 0.0256; the fourth cemented group 32 is composed of a third biconvex positive lens 321 cemented with a second biconcave negative lens 322 and has an optical power of about-0.004.
The axial distance between the first gluing set 11 and the first single lens 12 is 0.1 mm; the axial distance between the first single lens 12 and the second single lens 13 is 2.34 mm; the distance between the second single lens 13 and the second glue set 14 is 0.1mm on the axis; the distance between the second gluing set 14 and the iris diaphragm 2 on the shaft is 4.2 mm; the distance between the iris diaphragm 2 and the third gluing set 31 on the shaft is 3.46 mm; the distance on the shaft between the third gluing set 31 and the fourth gluing set 32 is 0.1 mm; the distance on the shaft between the fourth gluing group 32 and the parallel flat plate 4 is 5.94 mm; the on-axis distance between the parallel plate 4 and the image plane 5 is 0.27 mm.
The focal power of the first single lens 12 is 0.0186; the second single lens 13 has an optical power of 0.0165, and a high-order axially symmetric aspheric surface on the front surface.
The first negative meniscus lens 111 is made of an optical glass material HZF 2.
The first meniscus positive lens 112, the second single lens 13 and the first double convex positive lens 141 adopt an optical glass material HZPK 1A.
The first single lens 12 is made of an optical glass material HZF7 LA.
The first biconcave negative lens 142 is constructed of an optical glass material HZF 52.
The second negative meniscus lens 311 is made of an optical glass material HFK6
The second biconvex positive lens 312 and the third biconvex positive lens 321 adopt an optical glass material HZLAF 55D.
The second biconcave negative lens 322 is made of an optical glass material HZF 3.
The front surface of the third biconvex positive lens 321 is a high-order axisymmetric aspheric surface.
Advantageous effects
The invention provides a day and night dual-purpose athermalization lens with a wide illumination range, and belongs to the technical field of optics. The optical system of the lens is sequentially and coaxially provided with a front group 1, an iris diaphragm 2, a rear group 3, a parallel flat plate 4 and an image surface 5 along the light incidence direction; the front group 1 comprises a first gluing group 11, a first single lens 12, a second single lens 13 and a second gluing group 14 which are sequentially arranged along the light incidence direction; the rear group 3 includes a third glue group 31 and a fourth glue group 32 sequentially arranged along the light incidence direction. The lens optical systems all use common optical glass, the purpose of achromatization is achieved by optimizing optical system materials and using a double cemented lens, and two high-order aspheric surfaces are introduced to realize large relative aperture and large image plane aberration correction; the invention has the characteristics of compact structure, large aperture, no thermalization and dual-purpose day and night.
Compared with the prior art, the invention has the following advantages;
1. the lens is suitable for a wide spectral range of 400nm-1000 nm: the optical design performs aberration correction on a wide spectral range by optimizing optical system materials and using a double cemented lens, so that the lens has excellent image quality in the wide spectral range. Especially, the extension towards the near infrared radiation spectrum range enables the lens to clearly image in an extremely low illumination environment at night.
2. The lens adopts the iris diaphragm to realize that the F/# is continuously adjustable from 1 to 16, two high-order aspheric surfaces are introduced in the optical design to realize the correction of large relative aperture and large image plane aberration, and the imaging of the large relative aperture of an optical system is realized, so that the lens can collect more night radiation in a low-illumination environmentAdaptive wide illumination range of 10 -3 lx to 10 5 lx。
3. The lens adopts an optical passive athermalization design, an aluminum alloy lens barrel is used for eliminating the heat difference, and an optical system can keep clear imaging in a temperature range of-55 ℃ to +80 ℃;
4. the structure form is simple and compact, and the assembly and debugging are simple.
Drawings
FIG. 1 is a view of the structure of an optical system of the present invention;
FIG. 2 shows the MTF evaluation results at 20 ℃ under normal temperature according to the present invention;
FIG. 3 shows the results of MTF evaluation at-55 ℃ according to the present invention;
FIG. 4 shows the results of MTF evaluation at 80 ℃ according to the present invention;
1-front group, 11-first glue group, 111-first negative meniscus lens, 112-first positive meniscus lens, 12-first single lens, 13-second single lens, 14-second glue group, 141-first double convex positive lens, 142-first double concave negative lens, 2-iris diaphragm, 3-rear group, 31-third glue group, 311-second negative meniscus lens, 312-second double convex positive lens, 32-fourth glue group, 321-third double convex positive lens, 322-second double concave negative lens, 4-parallel flat plate, 5-image plane.
Detailed Description
The invention will now be further described with reference to the following examples, and the accompanying drawings:
the technical scheme of the invention is as follows: the device is characterized by comprising a front group 1, an iris diaphragm 2, a rear group 3, a parallel flat plate 4 and an image surface 5 which are sequentially arranged along the light incidence direction; the front group 1 comprises a first gluing group 11, a first single lens 12, a second single lens 13 and a second gluing group 14 which are sequentially arranged along the light incidence direction; the rear group 3 includes a third glue group 31 and a fourth glue group 32 sequentially arranged along the light incidence direction.
The lens works in the range of 400-plus-1000 nm wave band, has optical athermalization effect, and the iris diaphragm 2 can realize the continuous adjustment of the F/# of the optical system from 1 to 16, and is suitable for the wide illumination range of 10 -3 lx to 10 5 lx。
The first cemented group 11 is cemented by a first negative meniscus lens 111 and a first positive meniscus lens 112, the second cemented group 14 is cemented by a first double convex positive lens 141 and a first double concave negative lens 142, the third cemented group 31 is cemented by a second negative meniscus lens 311 and a second double convex positive lens 312, and the fourth cemented group 32 is cemented by a third double convex positive lens 321 and a second double concave negative lens 322.
The axial distance between the first gluing set 11 and the first single lens 12 is 0.1 mm; the distance on the axis between the first single lens 12 and the second single lens 13 is 2.34 mm; the distance on the axis between the second single lens 13 and the second glue combination 14 is 0.1 mm; the distance between the second gluing set 14 and the iris diaphragm 2 on the axis is 4.2 mm; the distance between the iris diaphragm 2 and the third gluing set 31 on the shaft is 3.46 mm; the distance on the shaft between the third glue set 31 and the fourth glue set 32 is 0.1 mm.
The distance on the shaft between the fourth gluing group 32 and the parallel flat plate 4 is 5.94 mm; the on-axis distance between the parallel plate 4 and the image plane 5 is 0.27 mm.
The front surfaces of the second single lens 13 and the third biconvex positive lens 321 are high-order axisymmetric aspherical surfaces.
The first cemented combination 11 is composed of a first negative meniscus lens 111 and a first positive meniscus lens 112, and the focal power is about-0.0074; the first meniscus negative lens 111 is composed of an optical glass material HZF2, and the first meniscus positive lens 112 is composed of an optical glass material HZPK 1A.
The first single lens 12 has an optical power of about 0.0186 and is made of an optical glass material HZF7 LA.
The second single lens 13 has a power of about 0.0165, is made of an optical glass material HZPK1A, and has a high-order axially symmetric aspherical front surface.
The second cemented group 14 is cemented by a first double convex positive lens 141 and a first double concave negative lens 142, and its optical power is about-0.0207; the first double convex positive lens 141 is composed of an optical glass material HZPK1A, and the first double concave negative lens 142 is composed of an optical glass material HZF 52.
The third cemented group 31 is cemented by a second meniscus negative lens 311 and a second double convex positive lens 312, and its power is about 0.0256; the second meniscus negative lens 311 is made of an optical glass material HFK6, and the second double convex positive lens 312 is made of an optical glass material HZLAF 55D.
The fourth cemented group 32 is cemented by a third biconvex positive lens 321 and a second biconcave negative lens 322, and its focal power is about-0.004; the third biconvex positive lens 321 is made of an optical glass material HZLAF55D, and the second biconcave negative lens 322 is made of an optical glass material HZF 3; the front surface of the third biconvex positive lens 321 is a high-order axisymmetric aspheric surface.
The axial distance between the first gluing set 11 and the first single lens 12 is 0.1 mm; the distance on the axis between the first single lens 12 and the second single lens 13 is 2.34 mm; the distance on the axis between the second single lens 13 and the second glue combination 14 is 0.1 mm; the distance between the second gluing set 14 and the iris diaphragm 2 on the axis is 4.2 mm; the distance between the iris diaphragm 2 and the third gluing set 31 on the shaft is 3.46 mm; the distance on the shaft between the third glue set 31 and the fourth glue set 32 is 0.1 mm.
The distance on the shaft between the fourth gluing group 32 and the parallel flat plate 4 is 5.94 mm; the on-axis distance between the parallel plate 4 and the image plane 5 is 0.27 mm.
Claims (10)
1. A day and night dual-purpose athermalization lens with a wide illumination range is characterized in that the lens consists of a front group (1), an iris diaphragm (2), a rear group (3), a parallel flat plate (4) and an image plane (5) which are sequentially arranged along the light incidence direction; the front group (1) consists of a first gluing group (11), a first single lens (12), a second single lens (13) and a second gluing group (14) which are sequentially arranged along the light incidence direction; the rear group (3) is composed of a third gluing group (31) and a fourth gluing group (32) which are sequentially arranged along the light incidence direction; the first gluing group (11) is formed by gluing a first negative meniscus lens (111) and a first positive meniscus lens (112), and the focal power of the first gluing group is-0.0074 mm -1 (ii) a The second cementing group (14) is cemented by a first biconvex positive lens (141) and a first biconcave negative lens (142), and the focal power of the second cementing group is-0.0207 mm -1 (ii) a The third cementing group (31) is cemented by a second meniscus negative lens (311) and a second double convex positive lens (312), and the focal power of the third cementing group is 0.0256mm -1 (ii) a The fourth cemented combination (32) is formed by a third biconvex positive lens (321) cemented with a second biconcave negative lens (322), and the focal power thereof is-0.004 mm -1 (ii) a The focal power of the first single lens (12) is 0.0186mm -1 (ii) a The focal power of the second single lens (13) is 0.0165mm -1 The front surface is a high-order axisymmetric aspheric surface.
2. The day and night athermalization lens with wide illumination range according to claim 1, wherein: the distance between the first gluing set (11) and the first single lens (12) on the axis is 0.1 mm; the distance on the axis between the first single lens (12) and the second single lens (13) is 2.34 mm; the distance on the axis between the second single lens (13) and the second glue combination (14) is 0.1 mm; the distance between the second gluing set (14) and the iris diaphragm (2) on the shaft is 4.2 mm; the distance between the variable diaphragm (2) and the third gluing set (31) on the shaft is 3.46 mm; the distance on the shaft between the third gluing set (31) and the fourth gluing set (32) is 0.1 mm; the distance between the fourth gluing group (32) and the parallel flat plate (4) on the shaft is 5.94 mm; the distance on the axis between the parallel plate (4) and the image plane (5) is 0.27 mm.
3. The day and night athermalization lens with wide illumination range according to claim 1, wherein: the first negative meniscus lens (111) adopts an optical glass material HZF 2.
4. The day and night athermalization lens with wide illumination range according to claim 1, wherein: the first meniscus positive lens (112), the second single lens (13) and the first double convex positive lens (141) adopt an optical glass material HZPK 1A.
5. The day and night athermalization lens with a wide illumination range according to claim 1, wherein: the first single lens (12) adopts an optical glass material HZF7 LA.
6. The day and night athermalization lens with a wide illumination range according to claim 1, wherein: the first biconcave negative lens (142) is constructed from an optical glass material HZF 52.
7. The day and night athermalization lens with wide illumination range according to claim 1, wherein: the second negative meniscus lens (311) is made of an optical glass material HFK 6.
8. The day and night athermalization lens with wide illumination range according to claim 1, wherein: the second biconvex positive lens (312) and the third biconvex positive lens (321) adopt an optical glass material HZLAF 55D.
9. The day and night athermalization lens with wide illumination range according to claim 1, wherein: the second double concave negative lens (322) adopts an optical glass material HZF 3.
10. The day and night athermalization lens with wide illumination range according to claim 1, wherein: the front surface of the third biconvex positive lens (321) is a high-order axisymmetric aspheric surface.
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| CN202011218600.7A CN112269238B (en) | 2020-11-04 | 2020-11-04 | Day and night dual-purpose athermal lens with wide illumination range |
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| CN202011218600.7A CN112269238B (en) | 2020-11-04 | 2020-11-04 | Day and night dual-purpose athermal lens with wide illumination range |
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| CN112269238B true CN112269238B (en) | 2022-07-29 |
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| JP5279532B2 (en) * | 2009-01-29 | 2013-09-04 | 株式会社栃木ニコン | Imaging optical system and inspection apparatus |
| CN106291890A (en) * | 2015-05-14 | 2017-01-04 | 桂林电子科技大学 | A kind of-0.1 × doubly telecentric machine vision object lens |
| JP6769199B2 (en) * | 2016-09-16 | 2020-10-14 | リコーイメージング株式会社 | Variable magnification optical system |
| CN107861229B (en) * | 2017-12-12 | 2023-10-10 | 厦门爱劳德光电有限公司 | High definition wide angle unmanned aerial vehicle camera lens |
| CN110618521B (en) * | 2019-09-30 | 2024-12-31 | 江西特莱斯光学有限公司 | Ultra-thin lens for single-lens reflex camera |
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