CN109932809B - Large-aperture high-resolution light security monitoring infrared lens and working method thereof - Google Patents
Large-aperture high-resolution light security monitoring infrared lens and working method thereof Download PDFInfo
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- CN109932809B CN109932809B CN201910311904.9A CN201910311904A CN109932809B CN 109932809 B CN109932809 B CN 109932809B CN 201910311904 A CN201910311904 A CN 201910311904A CN 109932809 B CN109932809 B CN 109932809B
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- 238000012544 monitoring process Methods 0.000 title abstract description 15
- 238000000034 method Methods 0.000 title abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 53
- 230000005499 meniscus Effects 0.000 claims abstract description 43
- 150000004770 chalcogenides Chemical class 0.000 claims abstract description 14
- 238000003384 imaging method Methods 0.000 claims abstract description 7
- 230000004075 alteration Effects 0.000 claims description 8
- 230000003595 spectral effect Effects 0.000 claims description 5
- 238000005315 distribution function Methods 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 abstract 1
- 239000005387 chalcogenide glass Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
Abstract
The invention relates to a large-aperture high-resolution light security monitoring infrared lens and a working method thereof, which are characterized in that: the lens comprises 2 chalcogenide lenses and a diaphragm positioned between the 2 chalcogenide lenses, and a meniscus positive lens A, a diaphragm B and a meniscus positive lens C are arranged from an object surface to an image surface in sequence; the specific performance parameters of the optical structure consisting of the positive meniscus lens A, the diaphragm B and the positive meniscus lens C are as follows: (1) focal length: effl=10 mm, (2) F number=0.9, (3) angle of view: 2w is greater than or equal to 50 degrees, (4) optical distortion: less than or equal to 5 percent, (5) the imaging circle diameter is larger than phi 9.8, (6) the working spectrum range: 8 um-12 um, (7) the total optical length TTL is less than or equal to 28mm, and the optical post-intercept is more than or equal to 6.5mm. The invention utilizes the special heat difference and color difference characteristics of the diffraction surface, can effectively improve the color difference and heat difference of the system while reducing the number of lenses of the system, and realizes a short, small and light compact optical system.
Description
Technical field:
the invention provides a large-aperture high-resolution light security monitoring infrared lens and a working method thereof.
The background technology is as follows:
with the development of infrared optical technology, the application field of infrared lenses is wider and wider, and the infrared lenses are required to have high imaging quality, small size, light weight and keep working performance under different temperature environments. Most of the long-wave uncooled infrared lenses in the market are designed by matching with the resolution of 17 mu m of the pixel, along with the maturation of the infrared chip technology, detector manufacturers continuously push out detectors with smaller pixels with higher resolution in the market, the sizes of the pixels are only 14 mu m, 12 mu m and the like, the diffraction limit is approached, the optical performance requirement on the lenses is very high, however, few infrared lenses matched with the high-resolution detectors are used in the market.
The invention comprises the following steps:
the invention aims to overcome the defects, and provides the large-aperture high-resolution light security monitoring infrared lens which has the advantages of high light flux, light weight and low cost.
The invention relates to a large-aperture high-resolution light security monitoring infrared lens, which is characterized in that: the lens comprises 2 pieces of chalcogenide lenses and a diaphragm positioned between the 2 pieces of chalcogenide lenses, wherein a meniscus positive lens A, a diaphragm B and a meniscus positive lens C are arranged from an object surface to an image surface in sequence; the specific performance parameters of the optical structure consisting of the positive meniscus lens A, the diaphragm B and the positive meniscus lens C are as follows:
(1) Focal length: effl=10 mm
(2) F number=0.9
(3) Angle of view: 2w is more than or equal to 50 DEG
(4) Optical distortion: less than or equal to 5 percent
(5) The diameter of the imaging circle is larger than phi 9.8
(6) Working spectral range: 8um to 12um
(7) The total optical length TTL is less than or equal to 28mm, and the optical post-intercept is more than or equal to 6.5mm.
Further, the left-to-right spacing of the optical structures is as follows: the air interval between the meniscus positive lens A and the diaphragm B is 1.8mm; the air gap between the diaphragm B and the meniscus positive lens C is 1.2mm.
Further, setting the focal length as f, and setting the focal length of the optical lens from the object surface to the image surface as f1-f2 in sequence; the two have the following relationship: 8< f1/f <10, 0.5< f2/f <2.0.
Further, the above-mentioned meniscus positive lens a, stop B, and meniscus positive lens C parameter table:
| surface serial number | Radius of curvature (mm) | Interval (mm) | Material | Remarks |
| S1 | 10<R<20 | 8.3 | Chalcogenide glass | Aspherical surface |
| S2 | 5<R<15 | 1.8 | Diffraction plane | |
| Diaphragm | infinity | 1.2 | ||
| S4 | -60<R<-20 | 10 | Chalcogenide glass | Aspherical surface |
| S5 | -20<R<-10 | 4.2 | Diffraction plane |
Aspheric and diffractive surface related data:
| aspherical surface S1 | 1.863E-005 | 2.609E-007 | -4.727E-011 | 0 |
| Diffraction plane S2 | 1.586E-004 | 2.223E-005 | -8.989E-007 | -3.954E-009 |
| Aspherical surface S4 | -1.233E-003 | -2.634E-005 | 3.408E-007 | -6.081E-008 |
| Diffraction plane S5 | 3.635E-005 | -5.022E-007 | 2.936E-009 | -2.121E-011 |
The aspherical expression is:
z represents the position in the direction of the optical axis, r represents the height in the direction perpendicular to the optical axis, c represents the radius of curvature, k represents the conic coefficient,、/>、/>、/>.. it represents an aspherical coefficient, E-n represents "++in the aspherical data>", e.g., 1.863E-005 represents +.>。
Phase distribution function=m @ in diffraction plane zemax)：
| M | |||
| Diffraction plane S2 | 1 | -9.5 | -2.1 |
| Diffraction plane S5 | 1 | -37.92 | -5.3 |
The working method of the large-aperture high-resolution light security monitoring infrared lens is characterized by comprising the following steps of: large aperture high resolution light security monitoring infrared lens, its characterized in that: the lens comprises 2 pieces of chalcogenide lenses and a diaphragm positioned between the 2 pieces of chalcogenide lenses, wherein a meniscus positive lens A, a diaphragm B and a meniscus positive lens C are arranged from an object surface to an image surface in sequence; the specific performance parameters of the optical structure consisting of the positive meniscus lens A, the diaphragm B and the positive meniscus lens C are as follows:
(1) Focal length: effl=10 mm
(2) F number=0.9
(3) Angle of view: 2w is more than or equal to 50 DEG
(4) Optical distortion: less than or equal to 5 percent
(5) The diameter of the imaging circle is larger than phi 9.8
(6) Working spectral range: 8um to 12um
(7) The total optical length TTL is less than or equal to 28mm, and the optical back intercept is more than or equal to 6.5mm;
when the optical system works, light reaches IMA through the meniscus positive lens A, the diaphragm B and the meniscus positive lens C, and the special heat difference and chromatic aberration characteristics of the diffraction surface are utilized to reduce the number of lenses and simultaneously effectively improve chromatic aberration and heat difference, so that a short, small and light compact optical system is realized.
Compared with other lenses, the large-aperture high-resolution light security monitoring infrared lens has the advantages that:
a) The aperture is large, the radiation quantity entering the infrared lens is increased, and the shooting effect is good under severe weather conditions;
b) The special heat difference and the special color difference characteristics of the diffraction surface are utilized, so that the number of the infrared lens can be reduced, the color difference and the heat difference of the system can be effectively improved, and a short, small and light compact optical system is realized;
c) The even aspherical surface is used in combination, so that aberration is well balanced, and image quality is further improved; the sensitivity of each optical piece is reduced through the adjustment of curvature and thickness, so that the lens is easier to process and adjust.
d) The two lenses of the infrared lens are both made of chalcogenide materials, so that the image quality under the high and low temperature conditions is improved, and the optical athermalization is truly realized.
Description of the drawings:
FIG. 1 is a schematic cross-sectional construction of the present invention;
FIG. 2 shows the MTF value of the lens in a normal temperature environment;
FIG. 3 is a graph showing MTF function values of the lens in a low temperature-40 degree environment;
FIG. 4 is a graph showing MTF function values of the lens in a high temperature 80 degree environment;
fig. 5 is a graph of field curvature distortion at normal temperature.
The specific embodiment is as follows:
the invention is further described below with reference to the drawings and the detailed description.
The invention relates to a large-aperture high-resolution light security monitoring infrared lens, which is characterized in that: the lens comprises 2 pieces of chalcogenide lenses and a diaphragm positioned between the 2 pieces of chalcogenide lenses, wherein a meniscus positive lens A, a diaphragm B and a meniscus positive lens C are arranged from an object surface to an image surface in sequence; the specific performance parameters of the optical structure consisting of the positive meniscus lens A, the diaphragm B and the positive meniscus lens C are as follows:
(1) Focal length: effl=10 mm
(2) F number=0.9
(3) Angle of view: 2w is more than or equal to 50 DEG
(4) Optical distortion: less than or equal to 5 percent
(5) The diameter of the imaging circle is larger than phi 9.8
(6) Working spectral range: 8um to 12um
(7) The total optical length TTL is less than or equal to 28mm, and the optical post-intercept is more than or equal to 6.5mm.
Further, the left-to-right spacing of the optical structures is as follows: the air interval between the meniscus positive lens A and the diaphragm B is 1.8mm; the air gap between the diaphragm B and the meniscus positive lens C is 1.2mm.
Further, setting the focal length as f, and setting the focal length of the optical lens from the object surface to the image surface as f1-f2 in sequence; the two have the following relationship: 8< f1/f <10, 0.5< f2/f <2.0.
A parallel plate D is arranged between the meniscus positive lens C and the IMA project.
Further, the above-mentioned meniscus positive lens a, stop B, and meniscus positive lens C parameter table:
| surface serial number | Radius of curvature (mm) | Interval (mm) | Material | Remarks |
| S1 | 10<R<20 | 8.3 | Chalcogenide glass | Aspherical surface |
| S2 | 5<R<15 | 1.8 | Diffraction plane | |
| Diaphragm | infinity | 1.2 | ||
| S4 | -60<R<-20 | 10 | Chalcogenide glass | Aspherical surface |
| S5 | -20<R<-10 | 4.2 | Diffraction plane |
Aspheric and diffractive surface related data:
| aspherical surface S1 | 1.863E-005 | 2.609E-007 | -4.727E-011 | 0 |
| Diffraction plane S2 | 1.586E-004 | 2.223E-005 | -8.989E-007 | -3.954E-009 |
| Aspherical surface S4 | -1.233E-003 | -2.634E-005 | 3.408E-007 | -6.081E-008 |
| Diffraction plane S5 | 3.635E-005 | -5.022E-007 | 2.936E-009 | -2.121E-011 |
The aspherical expression is:
z represents the position in the direction of the optical axis, r represents the height in the direction perpendicular to the optical axis, c represents the radius of curvature, k represents the conic coefficient,、/>、/>、/>.. it represents an aspherical coefficient, E-n represents "++in the aspherical data>", e.g., 1.863E-005 represents +.>。
Phase distribution function=m @ in diffraction plane zemax)：
| M | |||
| Diffraction plane S2 | 1 | -9.5 | -2.1 |
| Diffraction plane S5 | 1 | -37.92 | -5.3 |
The working method of the large-aperture high-resolution light security monitoring infrared lens is characterized by comprising the following steps of: large aperture high resolution light security monitoring infrared lens, its characterized in that: the lens comprises 2 pieces of chalcogenide lenses and a diaphragm positioned between the 2 pieces of chalcogenide lenses, wherein a meniscus positive lens A, a diaphragm B and a meniscus positive lens C are arranged from an object surface to an image surface in sequence; the specific performance parameters of the optical structure consisting of the positive meniscus lens A, the diaphragm B and the positive meniscus lens C are as follows:
(1) Focal length: effl=10 mm
(2) F number=0.9
(3) Angle of view: 2w is more than or equal to 50 DEG
(4) Optical distortion: less than or equal to 5 percent
(5) The diameter of the imaging circle is larger than phi 9.8
(6) Working spectral range: 8um to 12um
(7) The total optical length TTL is less than or equal to 28mm, and the optical back intercept is more than or equal to 6.5mm;
when the optical system works, light reaches IMA through the meniscus positive lens A, the diaphragm B and the meniscus positive lens C, and the special heat difference and chromatic aberration characteristics of the diffraction surface are utilized to reduce the number of lenses and simultaneously effectively improve chromatic aberration and heat difference, so that a short, small and light compact optical system is realized.
Compared with other lenses, the large-aperture high-resolution light security monitoring infrared lens has the advantages that:
a) The aperture is large, the radiation quantity entering the infrared lens is increased, and the shooting effect is good under severe weather conditions;
b) The special heat difference and the special color difference characteristics of the diffraction surface are utilized, so that the number of the infrared lens can be reduced, the color difference and the heat difference of the system can be effectively improved, and a short, small and light compact optical system is realized;
c) The even aspherical surface is used in combination, so that aberration is well balanced, and image quality is further improved; the sensitivity of each optical piece is reduced through the adjustment of curvature and thickness, so that the lens is easier to process and adjust.
d) The two lenses of the infrared lens are both made of chalcogenide materials, so that the image quality under the high and low temperature conditions is improved, and the optical athermalization is truly realized.
As can be seen from fig. 2, the lens has a higher resolution, and meets the transfer function requirement of 640x512, 12um uncooled detector; as can be seen from fig. 3 and 4, the MTF attenuation of the lens is small in the high-temperature and low-temperature environments, so that the optical athermalization performance of the lens is realized. As can be seen from fig. 5, the lens satisfies the distortion requirement.
The invention relates to a large-aperture high-resolution light security monitoring infrared lens which is composed of two lenses, wherein an optical system of the lens has a larger field angle, can shoot scenes in a larger range, has large light flux, high resolution, small volume, light weight and nearly zero temperature drift, can be normally used in a high-temperature or low-temperature environment, and can be matched with 640x512 and 12um uncooled long-wave infrared detectors.
The invention is matched with a high-resolution detector continuously pushed out by a detector manufacturer, is favorable for making up a gap of a high-resolution lens in the market, is matched with an 640x512@12um uncooled detector, has the advantages of high light flux, light weight, low cost, simple mechanical structure and high transmissivity, and can be applied to the fields of security monitoring, airborne pods and the like.
While the foregoing is directed to the preferred embodiment, other and further embodiments of the invention will be apparent to those skilled in the art from the following description, wherein the invention is described, by way of illustration and example only, and it is intended that the invention not be limited to the specific embodiments illustrated and described, but that the invention is to be limited to the specific embodiments illustrated and described.
Claims (1)
1. The utility model provides a light-duty security protection control infrared lens of large aperture high resolution which characterized in that: the lens comprises 2 pieces of chalcogenide lenses and a diaphragm positioned between the 2 pieces of chalcogenide lenses, wherein a meniscus positive lens A, a diaphragm B and a meniscus positive lens C are arranged from an object surface to an image surface in sequence; the specific performance parameters of the optical structure consisting of the positive meniscus lens A, the diaphragm B and the positive meniscus lens C are as follows:
(1) Focal length: effl=10 mm
(2) F number=0.9
(3) Angle of view: 2w is more than or equal to 50 DEG
(4) Optical distortion: less than or equal to 5 percent
(5) The diameter of the imaging circle is larger than phi 9.8
(6) Working spectral range: 8um to 12um
(7) The total optical length TTL is less than or equal to 28mm, and the optical back intercept is more than or equal to 6.5mm;
the left-to-right spacing of the optical structures is as follows: the air interval between the meniscus positive lens A and the diaphragm B is 1.8mm; the air interval between the diaphragm B and the meniscus positive lens C is 1.2mm; setting the focal length as f, and setting the focal length of the optical lens from the object surface to the image surface as f1-f2 in sequence; the two have the following relationship: 8< f1/f <10, 0.5< f2/f <2.0;
the meniscus positive lens A, the diaphragm B and the meniscus positive lens C parameter table:
aspheric and diffractive surface related data:
，
the aspherical expression is:
，
z represents the position in the direction of the optical axis, r represents the height in the direction perpendicular to the optical axis, c represents the radius of curvature, k represents the conic coefficient,represents an aspherical coefficient, and E-n represents "+_in the aspherical data>”；
Phase distribution function=m @ in diffraction plane zemax)：
；
When the optical system works, light reaches IMA through the meniscus positive lens A, the diaphragm B and the meniscus positive lens C, and the special heat difference and chromatic aberration characteristics of the diffraction surface are utilized to reduce the number of lenses and simultaneously effectively improve chromatic aberration and heat difference, so that a short, small and light compact optical system is realized.
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| CN110955032B (en) * | 2020-01-03 | 2023-07-21 | 福建福光天瞳光学有限公司 | Large-target-surface high-resolution optical athermalized lens and working method thereof |
| CN114967060B (en) * | 2022-06-15 | 2023-07-14 | 安徽光智科技有限公司 | Small-sized infrared lens capable of eliminating heat difference |
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| JP2006330575A (en) * | 2005-05-30 | 2006-12-07 | Konica Minolta Opto Inc | Imaging lens |
| CN1971331A (en) * | 2005-11-25 | 2007-05-30 | 三星电机株式会社 | Subminiature optical system |
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| CN109143539A (en) * | 2017-06-27 | 2019-01-04 | 佳能株式会社 | Optical system and image pick-up device including the optical system |
| CN209979915U (en) * | 2019-04-18 | 2020-01-21 | 福建福光股份有限公司 | Large-aperture high-resolution light security monitoring infrared lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004326097A (en) * | 2003-04-09 | 2004-11-18 | Olympus Corp | Image forming optical system and electronic apparatus using image forming optical system |
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2019
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07301748A (en) * | 1994-03-10 | 1995-11-14 | Konica Corp | Lens system having graded index lens |
| JP2005250512A (en) * | 2002-07-30 | 2005-09-15 | Konica Minolta Opto Inc | Imaging lens |
| JP2006330575A (en) * | 2005-05-30 | 2006-12-07 | Konica Minolta Opto Inc | Imaging lens |
| CN1971331A (en) * | 2005-11-25 | 2007-05-30 | 三星电机株式会社 | Subminiature optical system |
| CN103229088A (en) * | 2010-11-23 | 2013-07-31 | 尤米科尔公司 | Super wide angle lens arrangement for infrared applications |
| CN102830485A (en) * | 2012-09-13 | 2012-12-19 | 河北汉光重工有限责任公司 | Diaphragm-changeable infrared double-view-field optical lens |
| CN104503067A (en) * | 2014-09-22 | 2015-04-08 | 青岛歌尔声学科技有限公司 | Image capture lens |
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