CN2710009Y - Wide spectral confocal long-focus photography lens - Google Patents
Wide spectral confocal long-focus photography lens Download PDFInfo
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- CN2710009Y CN2710009Y CN 200420048615 CN200420048615U CN2710009Y CN 2710009 Y CN2710009 Y CN 2710009Y CN 200420048615 CN200420048615 CN 200420048615 CN 200420048615 U CN200420048615 U CN 200420048615U CN 2710009 Y CN2710009 Y CN 2710009Y
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Abstract
The utility model relates to a wide spectral confocal long-focus photography lens, particularly to an optical lens which is especially suitable for day-night dual-purpose television monitoring video cameras. The utility model is characterized in that the wide spectral confocal long-focus photography lens is composed of a biconvex positive lens, a concave flat negative lens, a biconvex positive lens, a biconcave negative lens, a concave-convex positive lens and a convex-concave half-moon negative lens in sequence; a light-changing density lens is positioned between each of the six lenses and a target surface. The first and the second lenses form the front group of the utility model, and the combined focus is f [front]'; the third to the sixth lenses form the back group of the utility model, and the combined focus is f [back]'; 1.4<f [front]'/f'<2, 2.5<f [back]'/f'<3.2; -0.02<|h2 /R2 | - |h3/R3 |<0.02, -0.06<|h8 /R8 | - |h7 /R7 | <0.06; when f' is more than 150mm and is less than 300mm, |1'<c-d>| <or =0.03mm, delta 1'<0.72-d>| <or =0.05mm; 1.63<n1 <1.7, 50<V1 <53; 1.58<n5 <1.63, 43<V5 <48; -0.5<f6'/f [back]'<-0.3. The utility model divides wide spectrum into visible light and near infrared light and then selects the same suitable focal surface to optimize cofocus so that the application of common materials reaches the standard.
Description
Technical field: the utility model relates to optical camera lens device, is specially adapted to day and night TV monitoring and controlling video camera.
Prior art: existing most of television camera camera lenses are only considered at the visible light regional imaging, near infrared light zone shooting effect is relatively poor, though some low-light level television pick-up lenss are also considered SPECTRAL REGION is extended to the near infrared spectrum district, confocal property and imaging definition are relatively poor.The camera lens that focusing is long because the imaging surface in daytime and evening is inconsistent, needs to adjust the side's of elephant intercept repeatedly and could obtain observable image when observing same target, uses very inconvenient.
External in recent years for adapting to the novel camera lens of IR of to have sought development of day and night TV monitoring and controlling.It adopts aspheric surface and more expensive group of the lanthanides optical material, has solved short focal length and medium focal length lens spherochromatism problem, and its price is somewhat expensive.The heavy caliber pick-up lens that focusing is long, then adopt and depart from the bigger special optical material of normal dispersion distribution straight line, as FK class glass, CaF2 or melting quartz etc., not only cost an arm and a leg, its process industrial art performance is very poor, the camera lens sexual valence ratio of making is difficult to popularize in security protection TV monitoring and controlling field.
We calculate and have consulted U.S. Pat 2989895, US3320016 and a day disclosure and specially permit clear 54-164129, clear 55-22762 and more domestic low-light camera lens data, all can not satisfy the requirement that wide spectrum (0.486～0.9 μ m) is confocal and imaging performance is good simultaneously with the optical glass that is suitable for.The data of the Liar example that provides with U.S. Pat 2989895 is an example, and its performance index are E.F.L=1, FNo.=1.4, and B.F.L=0.282, the camera lens material is followed successively by ZK4, ZF1, LaKN22, ZF10, ZF9, ZF2.When it was zoomed to f '=240mm, its light path length overall (first to the target surface distance) was 415.9mm, when FNo.=1.8, chooses picture side intercept l
dDuring '=67.67mm, it is the best in quality at the visible light regional imaging.When characteristic frequency was 30lp/mm, the mtf value of point was 0.43 on the axle; The meridian direction MTF of off-axis point (image height is 8mm)
rValue is 0.35, sagitta of arc direction MTF
sValue is 0.4.The image quality in visible light district still is reasonable.But in the near infrared spectrum zone, having only elected capture side intercept is l
0.72During '=68.05mm, mtf value is higher slightly.When characteristic frequency was 30lp/mm, its mtf value of going up point had only 0.081, and outer meridian of axle and sagitta of arc direction mtf value only are 0.202 and 0.182, and this structure obviously not confocal (difference 0.38mm) is described, picture element is relatively poor in the near infrared light zone.Far can not satisfy the day and night requirement of TV monitoring and controlling.Other referenced patent also have similar problem.
Summary of the invention: the purpose of this utility model is to overcome above-mentioned defective, provides a kind of and can realize the confocal long-focus pick-up lens of long-focus large caliber wide spectrum confocal and that imaging performance is good at visible light and near infrared light SPECTRAL REGION.
Scheme of the present utility model is: the utility model optical devices of invention are to become the optical density dish by the spherical lens of six separation and one group of biplate parallel plate-type to constitute.The optical material of six spherical lenses is in proper order: ZBaF3, ZF4, ZBaF3, ZF6, TF3, ZF4, the profile of six spherical lenses is followed successively by: the biconvex positive lens, recessed flat negative lens, biconvex positive lens, double-concave negative lens, concavo-convex positive lens, convex-concave curved month type negative lens.Become the optical density dish between six-element lens and target surface.By first and second preceding group of constituting camera lens, its complex focus is with f
Before' expression; The 3rd to the 6th back group of constituting camera lens, f
AfterThe complex focus of ' expression back group.The fixed light hurdle is located between second and the 3rd lens.
The condition that optical devices must satisfy is as follows:
1.4＜f
Before'/f '＜2,2.5＜f
After'/f '＜3.2........... (1)
-0.02＜|h
2/R
2|-|h
3/R
3|＜0.02，
-0.06＜|h
8/R
8|-|h
7/R
7|＜0.06 ................(2)
When 150mm＜f '＜300mm
|1′
e-d|≤0.03mm，|Δ1′
0.72-d|≤0.05mm ......................(3)
1.63＜n
1＜1.7，50＜V
1＜53....................................(4)
1.58＜n
5＜1.63，43＜V
5＜48...................................(5)
-0.5＜f
6/ f
AfterThe 0.3......................................... of '＜-(6)
Advantage of the present utility model is: the SPECTRAL REGION (0.486-0.9 μ m) of broad is divided into visible light zone (0.486-0.6568 μ m) and near infrared spectrum zone (0.630-0.90 μ m), make the more scabrous second order spectrum problem reduction of the design wide spectrum object lens of large-aperture long-focus, even adopt the common optical material also can be on same focal plane, mtf value be all above 0.5 in the time of can both obtaining full visual field characteristic frequency 30lp/mm on two spectral coverages; When being 50lp/mm, characteristic frequency all reaches 0.35 the preferable result of its image quality of mtf value.
Because the optical material that adopts is cheap, and realized the miniaturization of device making the utility model cost performance higher by the reasonable disposition of focal length, be very beneficial for safety-security area etc. day and night the type TV monitoring and controlling apply.
Description of drawings:
Fig. 1 is the optical texture synoptic diagram of the utility model optical lens.
Fig. 2 is that this example is got f '=240mm, l
AltogetherDuring '=28.135mm, different visual fields (on 1 ω, 0.707 ω, 0.5 ω, the axle), the MIF curve map in visible light zone.Horizontal ordinate unit is: line is right/and mm.
Fig. 3 is that this example is got f '=240mm, l
AltogetherDuring '=28.135mm, different visual fields (on 1 ω, 0.707 ω, 0.5 ω, the axle), the MTF curve map near infrared spectrum zone.Horizontal ordinate unit is: line is right/and mm.
Fig. 4 is this example when getting f '=240mm, and main spectral line is got C spectral line, l
AltogetherDuring '=28.135mm, different visual fields (on 1 ω, 0.707 ω, 0.5 ω, the axle), the MTF curve map of full SPECTRAL REGION (0.486-0.95 μ m).Horizontal ordinate unit is: line is right/and mm.
Fig. 5 is the imaging situation signal of prior art visible light district light A and near infrared light SPECTRAL REGION light B.
Fig. 6 is the imaging situation signal of these optical devices visible light district light A and near infrared light SPECTRAL REGION light B.
Embodiment: the utility model optical devices of invention are to become optical density dish (9) by the spherical lens of six separation and one group of biplate parallel plate-type to constitute.The optical material of six spherical lenses is in proper order: ZBaF3, ZF4, ZBaF3, ZF6, TF3, ZF4, the profile of six spherical lenses is followed successively by: first (1) biconvex positive lens, second (2) recessed flat negative lens, the 3rd (3) biconvex positive lens, the 4th (4) double-concave negative lens, the 5th (5) concavo-convex positive lens, the 6th (6) convex-concave curved month type negative lens.Becoming optical density dish (9) is positioned between the 6th (6) lens and the target surface (7).Constitute preceding group of camera lens by first (1) and second (2), its complex focus with f before ' expression; The 3rd (3) to the 6th (6) constitute back group of camera lens, behind the f ' and the complex focus of group after representing.Fixed light hurdle (8) is located between second (2) and the 3rd (3) lens.
The condition that optical devices must satisfy is as follows:
1.4＜f
Before'/f '＜2,2.5＜f
After'/f '＜3.2........... (1)
-0.02＜|h
2/R
2|-|h
3/R
3|＜0.02，
-0.06＜|h
8/R
8|-|h
7/R
7|＜0.06 ................(2)
When 150mm＜f '＜300mm
|1′
c～d|≤0.03mm，|Δ1′
0.72～d|≤0.05mm...........(3)
1.63＜n
1＜1.7，50＜V
1＜53........................(4)
1.58＜n
5＜1.63，43＜V
5＜48.......................(5)
-0.5＜f
6'/f
AfterThe 0.3........................... of '＜-(6)
Setting the above-mentioned purpose that must satisfy condition is:
By condition (1) f '＜f as can be seen
Before'＜f
After', illustrate that optical system is positive positive light coke combination, the f of setting
Before' and f
After' can long (bigger) than lens focus f, the purpose of (1) of imposing a condition is group is born before can guaranteeing aperture angle not too big (it is better generally to be controlled at u '=0.2～0.25), like this before the senior axle that produces of group upward spherical aberration, coma, spherochromatism are all not too large.f
Before'＜2 can play the effect of shortening light path length overall, realize system's miniaturization.
The purpose that condition (2) is set is that the senior amount of aberration that correlation surface is produced can offset, make simultaneously the 2nd and the 3rd generation+S
1With the 7th and the 8th generation-S
1Be more or less the same, be convenient to go the balance surplus with other constituent element parameters.
The purpose that condition (3) is set is to guarantee to realize that two spectrum segments realize confocal necessary.
It is that the senior axle of group is gone up spherical aberration and improve ratio chromatism, required before reducing that condition (4) is set, and restriction adopts the high group of the lanthanides material of price to set.
It is the TF class optical material that can select to depart from normal dispersion coefficient distribution straight line that condition (5) is set, and plays the purpose that reduces the second order spectrum amount.
Condition (6) is to allow the 6th (6) to be in big-S of generation
1With-S
2And itself only bear a very little abnormal areas in last drift angle.These lens are the two sides and are close to concentric curved month type.
Principal character of the present utility model is: according to the active near infrared of the newly-developed actual conditions that type TV monitoring and controlling video camera day and night uses of throwing light on, this case proposes and the visible light on daytime can be divided into visible light zone (0.486～0.6568 μ m) and near infrared spectrum zone (0.63～0.9 μ m) two spectral coverages to the territory, wide spectral range (0.486～0.9 μ m) of near infrared light in evening.By selecting same suitable focal plane repeatedly the optical system of same structure to be carried out the Automatic Optimal aberration correction at separately spectral coverage.The difficulty of the aberration correction that minimizing is brought by second order spectrum even adopt the ordinary optical material, also can realize confocal and the good effect of each SPECTRAL REGION imaging.
R is the radius-of-curvature of sphere in the accompanying drawing 1, and d is airspace between the thickness of lens or lens, and l ' is the camera lens side of elephant intercept.When the focal distance f of camera lens '=during 240mm, the thickness of each sheet lens is no more than 30mm, the side's of elephant rear cut-off distance is about 28.1mm.The light path length overall only is 300mm.The change optical density dish (9) of lens combination back is to play to regulate the intensity of illumination (minimum in theory decaying to about 300 times) that camera lens enters target surface (7).
Table 1 is an example of the present utility model:
E.F.L=1, Fno.=1.63,2 ω=2 °, light path length overall TL=1.25, the confocal side of elephant intercept l
Altogether'=0.11723
Table 1: each eyeglass data
| Sequence number | R object plane (mm) | d ∞ (mm) | nd | Vd |
| 1 | 0.947241 | 0.095849 | 1.6591 | 51.12 |
| 2 | -1.288340 | 0.052717 | ||
| 3 | -1.337723 | 0.029172 | 1.72822 | 28.34 |
| 4 | ∞ | 0.115644 | ||
| 5 | ∞ (light hurdle) | 0.006251 | ||
| 6 | 0.623229 | 0.125021 | 1.65691 | 51.12 |
| 7 | -1.131438 | 0.016336 | ||
| 8 | -0.813677 | 0.125021 | 1.75523 | 27.53 |
| 9 | 0.802009 | 0.291715 | ||
| 10 | -1.844265 | 0.125021 | 1.61242 | 44.09 |
| 11 | -0.409027 | 0.009752 | ||
| 12 | 0.103434 | 0.02292 | 1.72822 | 28.34 |
| 13 | 0.083347 | 0.075846 | ||
| 14 | ∞ | 0.041674 | 1.52196 | 64.1 |
| 15 | ∞ | 0.117228 | ||
| 16 | ∞ |
When this example was got f '=240mm, preceding group of focal length value of d spectral line was f
Before'=345.6mm, back group focal length value is f
After'=691.1mm, f
6The 272.4mm of '=-.Confocal rear cut-off distance l
Altogether'=28.135mm.
In the visible light zone (the d spectral line is main design spectral line), first-order aberration coefficient is Σ S
1=0.01777, Σ S
2=0.00426, Σ S
3=0.00043, Σ S
4=0.00046, Σ S
5=-0.0055, Σ C
1=0.0387, Σ C
2=0.00043, f
d=240mm, l
d'=28.15mm, l
c'=28.135mm, l
F'=28.535mm.
Near infrared light SPECTRAL REGION (0.72 μ m spectral line is main design spectral line), rear cut-off distance is got l
AltogetherDuring '=28.135mm, first-order aberration coefficient is: Σ S
1=0.04264, Σ S
2=0.0038, Σ S
3=0.00029, Σ S
4=0.00051, Σ S
6=-0.0055, Σ C
1=-0.04298, Σ C
2=0.00014, f
0.72'=240pzmm, l
0.72'=28.187mm, l
0.63'=28.129mm, l
0.95'=28.585mm.
From result of calculation, l
d', l
c', l
0.72' be more or less the same l
F' and l
0.95' differ also little, reach confocal purpose.
Claims (2)
1, the confocal long-focus pick-up lens of wide spectrum, comprise that six are followed successively by first (1) biconvex positive lens, second (2) recessed flat negative lens, the 3rd (3) biconvex positive lens, the 4th (4) double-concave negative lens, the 5th (5) concavo-convex positive lens, the 6th (6) convex-concave curved month type negative lens, light hurdle (8) is located between second (2) and the 3rd (3) lens, it is characterized in that becoming optical density dish (9) and be positioned at the 6th (6) between the target surface (7), constitute preceding group of camera lens by first (1) and second (2), its complex focus with f before ' expression; The 3rd (3) to the 6th (6) constitute back group of camera lens, behind the f ' represent the complex focus of back group, the condition that optical devices must satisfy is as follows:
1.4＜f
Before'/f '＜2,2.5＜f
After'/f '＜3.2........... (1)
-0.02＜|h
2/R
2|-|h
3/R
3|＜0.02，
-0.06＜|h
8/R
8|-|h
7/R
7|＜0.06................(2)
When 150mm＜f '＜300mm
|l′
c～d|≤0.03mm，|Δl′
0.72～d|≤0.05mm............(3)
1.63＜n
1＜1.7，50＜V
1＜53........................(4)
1.58＜n
5＜1.63，43＜V
5＜48......................(5)
-0.5＜f
6'/f
AfterThe 0.3........................... of '＜-(6)
2, the confocal long-focus pick-up lens of wide spectrum according to claim 1 is characterized in that light hurdle (8) is the fixed light hurdle.
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| CN 200420048615 CN2710009Y (en) | 2004-04-01 | 2004-04-01 | Wide spectral confocal long-focus photography lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420048615 CN2710009Y (en) | 2004-04-01 | 2004-04-01 | Wide spectral confocal long-focus photography lens |
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| Publication Number | Publication Date |
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| CN2710009Y true CN2710009Y (en) | 2005-07-13 |
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| CN101833163A (en) * | 2010-05-20 | 2010-09-15 | 福州福赛特光学仪器有限公司 | High definition broad spectrum co-focal plane video camera |
| CN102087395A (en) * | 2010-11-30 | 2011-06-08 | 福州福赛特光学仪器有限公司 | Method for realizing broad spectrum confocal plane of lens and broad spectrum confocal plane lens device |
| CN102109653A (en) * | 2011-04-14 | 2011-06-29 | 宜兴市普天视电子有限公司 | Aspheric lens for monitoring camera |
| CN102298196A (en) * | 2010-06-22 | 2011-12-28 | 上海微电子装备有限公司 | Lithography projection objective with large view field and wide spectral line |
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2004
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| CN101833163B (en) * | 2010-05-20 | 2011-08-10 | 福州福赛特光学仪器有限公司 | High definition broad spectrum co-focal plane video camera |
| CN101833163A (en) * | 2010-05-20 | 2010-09-15 | 福州福赛特光学仪器有限公司 | High definition broad spectrum co-focal plane video camera |
| CN102298196A (en) * | 2010-06-22 | 2011-12-28 | 上海微电子装备有限公司 | Lithography projection objective with large view field and wide spectral line |
| CN102298196B (en) * | 2010-06-22 | 2013-10-30 | 上海微电子装备有限公司 | Lithography projection objective with large view field and wide spectral line |
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| CN102985865B (en) * | 2010-07-16 | 2015-03-11 | 柯尼卡美能达株式会社 | Image capture lens |
| CN102087395A (en) * | 2010-11-30 | 2011-06-08 | 福州福赛特光学仪器有限公司 | Method for realizing broad spectrum confocal plane of lens and broad spectrum confocal plane lens device |
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| CN102681148B (en) * | 2011-03-11 | 2014-08-27 | 大立光电股份有限公司 | Image capturing lens assembly |
| CN102681148A (en) * | 2011-03-11 | 2012-09-19 | 大立光电股份有限公司 | Image capturing lens assembly |
| CN102109653A (en) * | 2011-04-14 | 2011-06-29 | 宜兴市普天视电子有限公司 | Aspheric lens for monitoring camera |
| CN102854606A (en) * | 2011-06-28 | 2013-01-02 | 大立光电股份有限公司 | Optical image capturing lens assembly |
| CN102854606B (en) * | 2011-06-28 | 2014-10-29 | 大立光电股份有限公司 | Optical image capturing lens assembly |
| CN106094168A (en) * | 2016-07-27 | 2016-11-09 | 上海兴禄科技实业有限公司 | Realize the method that lens optical device high definition is the most confocal |
| CN106094168B (en) * | 2016-07-27 | 2018-10-23 | 上海兴禄科技实业有限公司 | Realize lens optical device high definition day and night confocal method |
| TWI601995B (en) * | 2017-01-18 | 2017-10-11 | Largan Precision Co Ltd | Image capturing lens assembly, imaging apparatus and electronic device |
| CN108857052A (en) * | 2018-09-04 | 2018-11-23 | 深圳市拓博瑞激光科技有限公司 | The confocal focusing optical system of dual wavelength |
| CN108857052B (en) * | 2018-09-04 | 2024-03-19 | 深圳市拓博瑞激光科技有限公司 | Dual-wavelength confocal focusing optical system |
| CN110646920A (en) * | 2019-09-17 | 2020-01-03 | 福建福光天瞳光学有限公司 | Long-focus vehicle-mounted optical lens and working method thereof |
| CN110646920B (en) * | 2019-09-17 | 2023-10-27 | 福建福光天瞳光学有限公司 | A long focal length vehicle-mounted optical lens and its working method |
| CN110837181A (en) * | 2019-12-20 | 2020-02-25 | 江苏林兴光学有限公司 | A day and night confocal optical lens and imaging device |
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