CN107092076B - A kind of high pass light quantity compact LONG WAVE INFRARED tight shot - Google Patents
A kind of high pass light quantity compact LONG WAVE INFRARED tight shot Download PDFInfo
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- CN107092076B CN107092076B CN201710415047.8A CN201710415047A CN107092076B CN 107092076 B CN107092076 B CN 107092076B CN 201710415047 A CN201710415047 A CN 201710415047A CN 107092076 B CN107092076 B CN 107092076B
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- Prior art keywords
- lens
- high pass
- light quantity
- long wave
- wave infrared
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- 230000003287 optical effect Effects 0.000 claims abstract description 29
- 238000003384 imaging method Methods 0.000 claims abstract description 12
- 230000005499 meniscus Effects 0.000 claims abstract description 12
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 8
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 5
- 230000004075 alteration Effects 0.000 abstract description 6
- 238000002834 transmittance Methods 0.000 abstract description 3
- 201000009310 astigmatism Diseases 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 238000009738 saturating Methods 0.000 description 2
- 238000001931 thermography Methods 0.000 description 2
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004297 night vision Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- 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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
-
- 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- 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
-
- 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
Abstract
The invention discloses a kind of high pass light quantity compact LONG WAVE INFRARED tight shots, be disposed with from the object side to the image side along optical axis direction be positive lens the first lens, second lens, the third lens and detector, first lens are positive meniscus shaped lens of the convex surface towards object side, second lens are positive meniscus shaped lens of the convex surface towards image space, the third lens are positive meniscus shaped lens of the convex surface towards object side, second lens and the third lens are spaced closely together, it is aspherical that first lens and the second lens, which respectively have one side, the detector is made of germanium protecting window and imaging surface, the concave surface of the first lens is arranged in aperture diaphragm；Three pieces lens combination of the present invention balances the aberrations such as spherical aberration, color difference, astigmatism, distortion well, is imaged on the focal plane of infrared detector, system image quality is good, and lens imaging is clear；Camera lens has the advantages that structure is simple, small in size, light-weight, and optical transmittance is high, and light passing amount is big, and furthermore system tolerance is insensitive, convenient for producing in enormous quantities.
Description
Technical field
The present invention relates to infrared optical system, in particular to a kind of high pass light quantity compact LONG WAVE INFRARED tight shot can
It is widely used in the army and the people's night vision and takes aim at tool field.
Background technique
In recent years, infrared thermal imaging technique is developed rapidly, and especially non-brake method Detection Techniques are slowly mature, non-system
Cold LONG WAVE INFRARED thermal imaging system is widely used in the fields such as military, vehicle-mounted, thermometric, power-line patrolling, boundary security protection, especially in military affairs
Field extensive application.
Compared with the thermal infrared imager that freezes, Uncooled infrared camera wants lower to the response susceptibility of the temperature difference.In order to
Sensitivity of the Uncooled infrared camera to the temperature difference is improved, the relative aperture of infrared optical system can suitably be taken greatly.
The relative aperture of existing uncooled ir camera lens is mainly 1:1 or 1:0.9, in overcast and rainy or haze weather, this eka-ytterbium
The imaging effect of head is bad.
Summary of the invention
In order to solve the problems, such as that uncooled ir lens imaging is ineffective in inclement weather, the present invention provides a kind of big
Relative aperture compact LONG WAVE INFRARED tight shot.
The technical solution adopted by the present invention to solve the technical problems is: a kind of high pass light quantity compact LONG WAVE INFRARED fixed-focus
Camera lens, be disposed with from the object side to the image side along optical axis direction be the first lens of positive lens, the second lens, the third lens and
Detector, first lens are positive meniscus shaped lens of the convex surface towards object side, have and focus effect of light, described second
Lens are positive meniscus shaped lens of the convex surface towards image space, and the third lens are positive meniscus shaped lens of the convex surface towards object side,
Spacing of the spacing of second lens and the third lens less than the first lens and the second lens, first lens and the second lens
It is aspherical for respectively having on one side, and it further includes aperture diaphragm that the detector is made of germanium protecting window and imaging surface, the hole
The concave surface of the first lens is arranged in diameter diaphragm, and wherein tight shot meets following equation:
FNO is the F number of optical system；F1 is first focal length of lens；F23 is the group focus of the second lens, the third lens
Away from；N1 is the Refractive Index of Material of the first lens；R1 is the radius of the first convex lens surface, and f is the total focal length of camera lens.
A kind of high pass light quantity compact LONG WAVE INFRARED tight shot, the focal length f1 and camera lens of the first lens are always burnt
Away from f, there are following relationships:
。
A kind of high pass light quantity compact LONG WAVE INFRARED tight shot, the focal length f2 and camera lens of the second lens are always burnt
Away from f, there are following relationships:
。
A kind of high pass light quantity compact LONG WAVE INFRARED tight shot, the focal length f3 and camera lens of the third lens are always burnt
Away from f, there are following relationships:
。
The concave surface of a kind of high pass light quantity compact LONG WAVE INFRARED tight shot, the first lens and the second lens is
It is aspherical, and meet following formula:
Wherein, Z (Y) be it is aspherical along optical axis direction when being highly the position of Y, away from aspheric vertex of surface apart from rise；R
For the radius of curvature of eyeglass；A4、A6、A8、A10Respectively aspherical quadravalence coefficient, six level numbers, eight level numbers and ten level numbers.
A kind of high pass light quantity compact LONG WAVE INFRARED tight shot, the first lens, the second lens and third are saturating
Mirror is free of diffraction surfaces.
A kind of high pass light quantity compact LONG WAVE INFRARED tight shot, which is characterized in that first lens, second
Lens and the third lens are all made of germanium material.
A kind of high pass light quantity compact LONG WAVE INFRARED tight shot, F number are 0.7.
A kind of high pass light quantity compact LONG WAVE INFRARED tight shot, is provided between the third lens and detector
Baffle.
The beneficial effects of the present invention are:
Three pieces lens combination balances the aberrations such as spherical aberration, color difference, astigmatism, distortion well, is imaged on infrared detector
Focal plane, system image quality is good, and lens imaging is clear；It is simple, small in size, light-weight that camera lens of the present invention has a structure, optical lens
The advantages that rate is high, and light passing amount is big is crossed, in addition, system tolerance is insensitive, convenient for producing in enormous quantities.
Compared with prior art, the present invention having the following characteristics that
1, lens optical system is three separate types +++ structure type, different from common+-+Ke Ke type structure type, knot
Structure is simple, light-weight, size is small, is convenient for adjustment；System number of lenses is few, is conducive to improve lens optical transmitance.
2, lens optical system has object lens of large relative aperture, and F number is 0.7, guarantees the big light passing amount of camera lens, to improve system
To the susceptibility of the temperature difference；It is aspherical comprising two in this outer optical system, the various aberrations of system are corrected well, even if
Overcast and rainy or haze weather, camera lens also can blur-free imaging, compared with conventional camera lens, the present invention has more in the case where meeting and providing visual field
Remote target acquisition distance.
3, lens optical system makes camera lens blur-free imaging under high and low temperature environment by focusing using whole group focusing mode.
4, baffle mechanism is set between the last one side of optical system and detector target surface, when baffle cuts optical path, plays school
Positive infrared image effect.
Detailed description of the invention
Fig. 1 is optical system light path structural schematic diagram of the present invention；
Fig. 2 is optical system transfer function figure of the present invention.
Each appended drawing reference are as follows:
1-the first lens, the 2-the second lens, 3-the third lens, 4-detectors, 41-germanium protecting windows, 42-imagings
Face, 5-aperture diaphragms.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Shown in reference picture 1, Fig. 2, the invention discloses a kind of high pass light quantity compact LONG WAVE INFRARED tight shot, structure shapes
Formula be three separate structures, be disposed with three groups of positive lens from the object side to the image side along optical axis direction, be followed successively by the first lens 1,
Second lens 2, the third lens 3 and detector 4, first lens 1 are convex surface towards the positive meniscus shaped lens of object side, are had
Effect of light is focused, second lens 2 are positive meniscus shaped lens of the convex surface towards image space, and the third lens 3 are convex
Facing towards the positive meniscus shaped lens of object side, the second lens 2 and the third lens 3 are spaced closely together, and first lens 1 and second are saturating
Mirror 2 respectively have one side be it is aspherical, balance reduce system aberration, the detector 4 is by germanium protecting window 41 and 42 groups of imaging surface
At further including aperture diaphragm 5, the concave surface of the first lens 1 is arranged in the aperture diaphragm 5, and wherein tight shot meets following
Formula:,
There are following relationships by the focal length f1 and camera lens total focal length f of first lens 1:,
There are following relationships by the focal length f2 and camera lens total focal length f of second lens 2:,
There are following relationships by the focal length f3 and camera lens total focal length f of the third lens 3:,
FNO is the F number of optical system；F1 is 1 focal length of the first lens；F23 is the combination of the second lens 2, the third lens 3
Focal length；N1 is the Refractive Index of Material of the first lens 1；R1 is the radius on 1 convex surface of the first lens, and f is the total focal length of camera lens.
Further, the first lens 1, the second lens 2 and the third lens 3 are free of diffraction surfaces, the first lens 1, the second lens 2
It is all made of germanium material with the third lens 3, the F number of camera lens is 0.7.
Incident light is incident from the first lens 1, is propagated through the second lens 2 and the third lens 3 again by aperture diaphragm 5, most
Post-concentration is on imaging surface 42.
The performance indicator that the present invention realizes has:
1. focal length: f '=30mm；
2.F number: F=0.7；
3. field angle: 2 ω=15.5 °；
4. service band: 8~12 μm；
5. resolution ratio: with 17 μm of Pixel size, the uncooled detector of pixel 384 × 288 matches；
6. operating temperature: -40 DEG C~+55 DEG C；
7. optical transmittance >=80%；
8. full filed maximum distortion < 2%.
Further, be provided with baffle between the third lens 3 and detector 4, due to optical system last
Baffle mechanism is set between face and detector target surface, when baffle cuts optical path, can play the role of correcting infrared image.
The specific design parameter of the optical system such as following table one:
The specific design parameter table of one optical system of table
In table one, face 2, face 4 are aspherical.
Specific aspherical surface data is shown in Table two.
The concave surface of first lens 1 and the second lens 2 is aspherical, and aspherical meets following formula:
,
Wherein, Z (Y) be it is aspherical along optical axis direction when being highly the position of Y, away from aspheric vertex of surface apart from rise；R
For the radius of curvature of eyeglass；A4、A6、A8、A10Respectively aspherical quadravalence coefficient, six level numbers, eight level numbers and ten level numbers；
Two aspherical surface data of table
Adjustment verifying is processed by practical volume production, it is simple, small in size, light-weight that this camera lens has a structure, optical transmittance
The advantages that height, light passing amount is big.In addition, system tolerance is insensitive, convenient for producing in enormous quantities.
Finally it should be noted that: the present invention is not limited to the above embodiments, one skilled in the relevant art
It should be appreciated that can also be modified or replaced equivalently without departing from the purpose of the present invention.
Claims (9)
1. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot, it is characterised in that: along optical axis direction from the object side to the image side according to
It is secondary be provided be positive lens the first lens (1), the second lens (2), the third lens (3) and detector (4), described first
Lens (1) are positive meniscus shaped lens of the convex surface towards object side, have and focus effect of light, and second lens (2) are convex surface
Towards the positive meniscus shaped lens of image space, the third lens (3) are positive meniscus shaped lens of the convex surface towards object side, the second lens
(2) and the spacing of the third lens (3) less than the first lens (1) and the second lens (2) spacing, first lens (1) and
The concave surface of second lens (2) be it is aspherical, the detector (4) is made of germanium protecting window (41) and imaging surface (42), and also
Including aperture diaphragm (5), the aperture diaphragm (5) is arranged in the concave surface of the first lens (1), and wherein tight shot meets following
Formula:
FNO is the F number of optical system；F1 is the first lens (1) focal length；F23 is the group of the second lens (2), the third lens (3)
Complex focus；N1 is the Refractive Index of Material of the first lens (1)；R1 is the radius on the first lens (1) convex surface, and f is the total focal length of camera lens.
2. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot according to claim 1, which is characterized in that described
There are following relationships by the focal length f1 and camera lens total focal length f of one lens (1):
。
3. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot according to claim 1, which is characterized in that described
There are following relationships by the focal length f2 and camera lens total focal length f of two lens (2):
。
4. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot according to claim 1, which is characterized in that described
There are following relationships by the focal length f3 and camera lens total focal length f of three lens (3):
。
5. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot according to claim 1, which is characterized in that described
The concave surface of one lens (1) and the second lens (2) meets following formula:
Wherein, Z (Y) be it is aspherical along optical axis direction when being highly the position of Y, away from aspheric vertex of surface apart from rise；R is mirror
The radius of curvature of piece；A4、A6、A8、A10Respectively aspherical quadravalence coefficient, six level numbers, eight level numbers and ten level numbers.
6. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot according to claim 1, which is characterized in that described
First lens (1), the second lens (2) and the third lens (3) are free of diffraction surfaces.
7. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot according to claim 1, which is characterized in that described
One lens (1), the second lens (2) and the third lens (3) are all made of germanium material.
8. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot according to claim 1, which is characterized in that camera lens
F number is 0.7.
9. a kind of high pass light quantity compact LONG WAVE INFRARED tight shot according to claim 1, which is characterized in that described
Baffle is provided between the third lens (3) and detector (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710415047.8A CN107092076B (en) | 2017-06-05 | 2017-06-05 | A kind of high pass light quantity compact LONG WAVE INFRARED tight shot |
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| CN201710415047.8A CN107092076B (en) | 2017-06-05 | 2017-06-05 | A kind of high pass light quantity compact LONG WAVE INFRARED tight shot |
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| CN107092076B true CN107092076B (en) | 2019-04-23 |
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| CN114199382A (en) * | 2021-12-15 | 2022-03-18 | 武汉高德智感科技有限公司 | Infrared temperature measurement lens and temperature measurement method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201965289U (en) * | 2010-12-29 | 2011-09-07 | 大立光电股份有限公司 | Image capturing optical system |
| CN102298199A (en) * | 2010-06-22 | 2011-12-28 | 大立光电股份有限公司 | Optical lens for photographing |
| CN104503067A (en) * | 2014-09-22 | 2015-04-08 | 青岛歌尔声学科技有限公司 | Image capture lens |
| CN105652413A (en) * | 2016-03-01 | 2016-06-08 | 浙江大学 | Imaging objective lens suitable for RGB-D camera |
-
2017
- 2017-06-05 CN CN201710415047.8A patent/CN107092076B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102298199A (en) * | 2010-06-22 | 2011-12-28 | 大立光电股份有限公司 | Optical lens for photographing |
| CN201965289U (en) * | 2010-12-29 | 2011-09-07 | 大立光电股份有限公司 | Image capturing optical system |
| CN104503067A (en) * | 2014-09-22 | 2015-04-08 | 青岛歌尔声学科技有限公司 | Image capture lens |
| CN105652413A (en) * | 2016-03-01 | 2016-06-08 | 浙江大学 | Imaging objective lens suitable for RGB-D camera |
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