CN207008165U - A kind of object lens of large relative aperture low-light level television is imaged pre-objective optical system - Google Patents
A kind of object lens of large relative aperture low-light level television is imaged pre-objective optical system Download PDFInfo
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- CN207008165U CN207008165U CN201720567238.1U CN201720567238U CN207008165U CN 207008165 U CN207008165 U CN 207008165U CN 201720567238 U CN201720567238 U CN 201720567238U CN 207008165 U CN207008165 U CN 207008165U
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Abstract
A kind of object lens of large relative aperture low-light level television is imaged pre-objective optical system, the front of image intensifier cathode plane is arranged on, the first negative meniscus, the first bent moon conformality lens, double-concave negative lens, the first biconvex positive lens, the second biconvex positive lens, the 3rd biconvex positive lens, colour difference correcting lens group and the 3rd bent moon negative shape lens are sequentially coaxially provided with along the direction of propagation of light.The utility model provides a kind of big visual field, object lens of large relative aperture pre-objective optical system for low-light level television imaging system, 50 ° of visual field, relative aperture 1:1.0；Object lens T number≤1.2, optical length≤55mm.The sensitivity to the light gathering and system of faint light is effectively increased, for by faint natural light（Such as starlight, moonlight and airglow）Target imaging under irradiation is on image intensifier cathode plane.
Description
Technical field
The utility model belongs to low-light level television imaging system technology field, and in particular to a kind of object lens of large relative aperture low-light level television
It is imaged pre-objective optical system.
Background technology
Low-light level television imaging system is to gather after being reflected using starlight, moonlight and airglow by target surface through pre-objective
It is burnt in image intensifier time pole-face, carry out what is be imaged after enhancing amplification to dark weak signal target optical radiation signal using image intensifier
Technology.It is convenient for night observation.
Night television system plays very important status in military field, and by night television system, front-line fighters can
Clearly to have insight into the sound of enemy army at night, and the command centre positioned at battle line rear, Zhi Huiren can be transmitted the video to
Member can also clearly recognize front operation situation and formulate rational measure of meeting an enemy attack depending on the situation, therefore study micro-
Light television imaging system is significant.
The main operational principle of low-light level television imaging system is as shown in figure 1, the light direction of propagation is left arrow side in figure
To focal imaging passes through picture on the cathode plane of image intensifier 10 after natural light is reflected into pre-objective 11 by target surface
Booster carries out the enhancing amplification of signal, is imaged on the fluorescent screen of image intensifier, then will be glimmering by relaying coupling optical system 12
Then the picture of optical screen shows in the progress image of image display 14 and observed for people coupled on CMOS/CCD imaging detectors 13
Examine.
Chinese periodical《War industry's journal》Published in the 8th phase page 1308~1312 of volume 35 that in August, 2014 is published Zhang Liang,
The paper of entitled " the lll night vision objective lens design for using plastic optical element " that Pan Xiaodong is delivered.A kind of use is described in text
Optical glass device and the lll night vision object lens of optical plastic element mixing, for reducing system weight.The system relative aperture
For 1/1.2, visual field is 40 °.Due to the optical property of plastic components be affected by temperature it is larger, introduce it is aspherical be used for realize system
Without thermalized design, the high processing costs of non-spherical lens, high is required to the assembly precision of system.In addition, the system is present relatively
The defects of aperture is small, and system illuminance of image plane is low.
The Chinese patent application of Application No. 201510474928.8 discloses a kind of wide-angle low-light pick-up lens, the system
Relative aperture is 1/1.2, due to image intensifier center illuminance and pre-objective relative aperture it is square directly proportional, to make picture
Face has enough illumination, it is necessary to the object lens of object lens of large relative aperture.In addition, the system number of lenses is more, it is made up of 11 lens, because
This system transmitance is high, inadequate to the light gathering of faint light, and the sensitivity of system is not high.
Application No. 201420804888.X Chinese patent application discloses one kind and is used for lll night vision preset lens, and this is
System overall length reach 285mm, and optical system length, volume are big, be difficult to meet in actual applications the miniaturization of low-light level television imaging system,
Light-weighted requirement.
Utility model content
In order to solve the technology that traditional low-light level television imaging pre-objective optical system relative aperture is small, light gathering is low
Problem, the utility model provide a kind of big visual field, object lens of large relative aperture pre-objective optical system for low-light level television imaging system
System, for by the target imaging under faint natural light such as starlight, moonlight and airglow irradiation in image intensifier, can be effective
Improve sensitivity of the low-light level television imaging system to the light gathering and system of faint light.
To achieve these goals, the concrete scheme that the utility model uses for：
A kind of object lens of large relative aperture low-light level television is imaged pre-objective optical system, the front of image intensifier is arranged on, along light
The direction of propagation of line be sequentially coaxially provided with the first negative meniscus, the first falcate positive lens, double-concave negative lens, first pair
Convex positive lens, the second biconvex positive lens, the 3rd biconvex positive lens, colour difference correcting lens group and the second negative meniscus.
The colour difference correcting lens group is formed by the 4th biconvex positive lens and the second falcate positive lens gluing；Described first
Negative meniscus, the first falcate positive lens bend towards image space, and the second falcate positive lens, the second negative meniscus are curved
To object space.
4th biconvex positive lens meet condition：0.85≤f 7/f≤ 0.95, Nd7>1.65 Vd7<50, whereinfFor light
System total focal length,f 7For the effective focal length of the 4th biconvex positive lens, Nd7For the d lines refractive index of the 4th biconvex positive lens material,
Vd7For the d line Abbe constants of the 4th biconvex positive lens material；The second falcate positive lens meets condition：3≤f 8/f≤
3.8, Nd8>1.85 Vd8<25, whereinfFor optical system total focal length,f 8For the effective focal length of the second falcate positive lens, Nd8For
The d lines refractive index of second falcate positive lens material, Vd8For the d line Abbe constants of the second falcate positive lens material.
First negative meniscus meet condition：-4.1≤f 1/f≤ -3.6, Nd1<1.55 Vd1>65, whereinfFor
Optical system total focal length,f 1For the effective focal length of the first negative meniscus, Nd1Rolled over for the d lines of the first negative meniscus material
Penetrate rate, Vd1For the d line Abbe constants of the first negative meniscus material.
The first falcate positive lens meets condition：2.3≤f 2/f≤ 2.6, Nd2>1.85 Vd2<35, whereinfFor light
System total focal length,f 2For the effective focal length of the first falcate positive lens, Nd2Reflected for the d lines of the first falcate positive lens material
Rate, Vd2For the d line Abbe constants of the first falcate positive lens material.
The double-concave negative lens meet condition：-0.8≤f 3/f≤ -0.6, Nd3>1.75 Vd3<30, whereinfFor optical system
System total focal length,f 3For the effective focal length of double-concave negative lens, Nd3For the d lines refractive index of double-concave negative lens material, Vd3It is negative saturating for concave-concave
The d line Abbe constants of mirror material.
First biconvex positive lens meet condition：1≤f 4/f≤ 1.3, Nd4>1.85 Vd4<35, whereinfFor optical system
System total focal length,f 4For the effective focal length of the first biconvex positive lens, Nd4For the d lines refractive index of the first biconvex positive lens material, Vd4For
The d line Abbe constants of first biconvex positive lens material.
Second biconvex positive lens meet condition：1.2≤f 5/f≤ 1.4, Nd5>1.65 Vd5>50, whereinfFor optics
System total focal length,f 5For the effective focal length of the second biconvex positive lens, Nd5For the d lines refractive index of the second biconvex positive lens material, Vd5
For the d line Abbe constants of the second biconvex positive lens material；3rd biconvex positive lens meet condition：3≤f 6/f≤ 3.5, Nd6<
1.70 Vd6<55, whereinfFor optical system total focal length,f 6For the effective focal length of the 3rd biconvex positive lens, Nd6For the 3rd biconvex just
The d lines refractive index of lens material, Vd6For the d line Abbe constants of the 3rd biconvex positive lens material.
Second negative meniscus meet condition：-0.85≤f 9/f≤ -0.8, Nd9>1.85 Vd9<25, whereinfFor
Optical system total focal length,f 9For the full effective focal length of the second negative meniscus, Nd9For the d of the full material of the second negative meniscus
Line refractive index, Vd9For the d line Abbe constants of the full material of the second negative meniscus.
Between the first falcate positive lens and the double-concave negative lens in the distance on optical axis be T23, described second pair
Between convex positive lens and the 3rd biconvex positive lens in the distance on optical axis be T56, second biconvex positive lens are on optical axis
Thickness be CT5, meet following condition：0.68≤T23+T56/CT5≤1.30。
The beneficial effects of the utility model are：
1st, utility model provides a kind of big visual field for low-light level television imaging system, object lens of large relative aperture pre-objective optics
System, relative aperture 1:1.0；Object lens T number≤1.2, effectively increase the sensitivity to the light gathering and system of faint light.
2nd, it is collocated with each other by the reasonable distribution of each lens strength, different materials, effectively reduces various aberrations to system
Influence, the lens numbers that the utility model uses are few, length and small volume, optical length≤55mm, so as to realize low-light electricity
Depending on the miniaturization and lightweight of imaging system.
3rd, the plane of incidence of each lens of system and exit facet reduce the difficulty of processing of eyeglass, relaxed all using sphere
The error tolerances of system, system resetting difficulty is effectively reduced, so as to improve system adjustment efficiency, and then reduce and be produced into
This.
4th, finally a piece of eyeglass i.e. close to image intensifier, is provided with the negative meniscus for bending towards object space, is advantageous to system
The distortion of hereby ten thousand curvature of field, the whole object lens of balance of correction system.In addition, can effectively it eliminate anti-due to booster window glass
Penetrate and produce ghost image in image planes.
Brief description of the drawings
Fig. 1 is low-light level television imaging system theory diagram；
Fig. 2 is index path of the present utility model；
Fig. 3 is transmission function figure of the present utility model；
Fig. 4 is curvature of field distortion figure of the present utility model；
Fig. 5 is chromatic longitudiinal aberration figure of the present utility model；
Fig. 6 is spherical aberration curve map of the present utility model.
Reference：1st, the first negative meniscus, the 2, first falcate positive lens, 3, double-concave negative lens, 4, first pairs
Convex positive lens, the 5, second biconvex positive lens, the 6, the 3rd biconvex positive lens, the 7, the 4th biconvex positive lens, the 8, second falcate are just saturating
Mirror, the 9, second negative meniscus, 10, image intensifier, 11, pre-objective, 12, intermediate coupling optical system, 13, CMOS/CCD
Imaging detector, 14, image display.
Embodiment
Embodiment of the present utility model is illustrated below according to accompanying drawing.
As shown in Fig. 2 the light direction of propagation is left arrow direction in figure, before a kind of object lens of large relative aperture low-light level television imaging
Objective lens optical system is put, the front of image intensifier 10 is arranged on and is imaged on the cathode plane of image intensifier 10, along the biography of light
Broadcast direction and be sequentially coaxially provided with the first negative meniscus 1, the first falcate positive lens 2, double-concave negative lens 3, the first biconvex
Positive lens 4, the second biconvex positive lens 5, the 3rd biconvex positive lens 6, colour difference correcting lens group and the second negative meniscus 9.Color
Difference correction lens group is formed by the 4th biconvex positive lens 7 and the gluing of the second falcate positive lens 8, the first negative meniscus 1, the
One falcate positive lens 2 bends towards image space, and the second falcate positive lens 8, the second negative meniscus 9 bend towards object space.
First negative meniscus 1 meet condition：-4.1≤f 1/f≤ -3.6, Nd1<1.55 Vd1>65, whereinfFor optics
System total focal length,f 1For the effective focal length of the first negative meniscus 1, Nd1Reflected for the d lines of the material of the first negative meniscus 1
Rate, Vd1For the d line Abbe constants of the material of the first negative meniscus 1.
First falcate positive lens 2 meets condition：2.3≤f 2/f≤ 2.6, Nd2>1.85 Vd2<35, whereinfFor optical system
System total focal length,f 2For the effective focal length of the first falcate positive lens 2, Nd2Reflected for the d lines of the material of the first falcate positive lens 2
Rate, Vd2For the d line Abbe constants of the material of the first falcate positive lens 2.
Double-concave negative lens 3 meet condition：-0.8≤f 3/f≤ -0.6, Nd3>1.75 Vd3<30, whereinfIt is total for optical system
Focal length,f 3For the effective focal length of double-concave negative lens 3, Nd3For the d lines refractive index of the material of double-concave negative lens 3, Vd3For double-concave negative lens
The d line Abbe constants of 3 materials.
First biconvex positive lens 4 meet condition：1≤f 4/f≤ 1.3, Nd4>1.85 Vd4<35, whereinfIt is total for optical system
Focal length,f 4For the effective focal length of the first biconvex positive lens 4, Nd4For the d lines refractive index of the material of the first biconvex positive lens 4, Vd4For
The d line Abbe constants of the material of one biconvex positive lens 4.
Second biconvex positive lens 5 meet condition：1.2≤f 5/f≤ 1.4, Nd5>1.65 Vd5>50, whereinfFor optical system
Total focal length,f 5For the effective focal length of the second biconvex positive lens 5, Nd5For the d lines refractive index of the material of the second biconvex positive lens 5, Vd5For
The d line Abbe constants of the material of second biconvex positive lens 5；
3rd biconvex positive lens 6 meet condition：3≤f 6/f≤ 3.5, Nd6<1.70 Vd6<55, whereinfIt is total for optical system
Focal length,f 6For the effective focal length of the 3rd biconvex positive lens 6, Nd6For the d lines refractive index of the material of the 3rd biconvex positive lens 6, Vd6For
The d line Abbe constants of the material of three biconvex positive lens 6.
4th biconvex positive lens 7 meet condition：0.85≤f 7/f≤ 0.95, Nd7>1.65 Vd7<50, whereinfFor optical system
System total focal length,f 7For the effective focal length of the 4th biconvex positive lens 7, Nd7For the d lines refractive index of the material of the 4th biconvex positive lens 7, Vd7
For the d line Abbe constants of the material of the 4th biconvex positive lens 7.
Second falcate positive lens 8 meets condition：3≤f 8/f≤ 3.8, Nd8>1.85 Vd8<25, whereinfFor optical system
Total focal length,f 8For the effective focal length of the second falcate positive lens 8, Nd8For the d lines refractive index of the material of the second falcate positive lens 8,
Vd8For the d line Abbe constants of the material of the second falcate positive lens 8.
Second negative meniscus 9 meet condition：-0.85≤f 9/f≤ -0.8, Nd9>1.85 Vd9<25, whereinfFor light
System total focal length,f 9For the effective focal length of the second negative meniscus 9, Nd9Rolled over for the d lines of the material of the second negative meniscus 9
Penetrate rate, Vd9For the d line Abbe constants of the material of the second negative meniscus 9.
It is collocated with each other by the reasonable distribution of each lens strength, different materials, effectively reduces various aberrations to system
Influence, the lens numbers that the utility model uses are few, length and small volume, optical length≤55mm, so as to realize low-light level television
The miniaturization and lightweight of imaging system.
Between first falcate positive lens 2 and double-concave negative lens 3 in the distance on optical axis be T23, the second biconvex positive lens 5
Between the 3rd biconvex positive lens 6 in the distance on optical axis be T56, the second biconvex positive lens 5 are CT in the thickness on optical axis5, it is full
It is enough lower condition：0.68≤T23+T56/CT5≤1.30。
The selection of image intensifier 10 to match with the utility model surpasses the image intensifying of two generations for 1XZ18/18WHP-LY high-performance
Device.
Preferably, the face type of each lens, size and glass material used are as shown in table 1, wherein radius of curvature, thickness,
Interval and the uniform mm of unit of bore.
Table 1
The plane of incidence and exit facet of each lens of system reduce the difficulty of processing of eyeglass all using sphere, relax and are
The error tolerances of system, system resetting difficulty is effectively reduced, so as to improve system adjustment efficiency, and then reduce production cost.
Second negative meniscus 9, and the second negative meniscus 9 and image intensifier are set in the front of image intensifier 10
10 distance is 2mm.By setting the second negative meniscus 9, be advantageous to correction system hereby ten thousand curvature of field, the whole object lens of balance
Distortion and eliminate due to booster window glass be reflected in image planes produce ghost image.
The utility model realize technical indicator be：0.5 μm~0.9 μm of wave band；Relative aperture 1:1.0；Object lens T numbers≤
1.2；50 ° of visual field；Focal length 20mm；Optical length≤55mm.Relative aperture 1 of the present utility model:1.0；Object lens T number≤1.2, have
Effect improves the sensitivity to the light gathering and system of faint light.
By simulation analysis, as shown in figure 3, the image intensifier selected corresponds to spatial frequency when being 40lp/mm, system transmission
Function minimum 0.2；As shown in figure 4, distortion is less than 5% in 3/4 visual field；As shown in figure 5, display system chromatic longitudiinal aberration obtains
Good correction；As shown in fig. 6, display system spherical aberration has obtained good correction.
Above example is only with restriction the technical solution of the utility model is illustrated and not to, although with reference to above-described embodiment pair
The utility model is described in detail, it will be understood by those within the art that；The utility model can still be entered
Row modification or equivalent substitution, without departing from any modification or partial replacement of spirit and scope of the present utility model, it all should
Cover among right of the present utility model.
Claims (10)
1. a kind of object lens of large relative aperture low-light level television is imaged pre-objective optical system, image intensifier is arranged on（10）Front, its
It is characterised by：The first negative meniscus are sequentially coaxially provided with along the direction of propagation of light（1）, the first falcate positive lens
（2）, double-concave negative lens（3）, the first biconvex positive lens（4）, the second biconvex positive lens（5）, the 3rd biconvex positive lens（6）, aberration
Correct lens group and the second negative meniscus（9）.
A kind of 2. object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 1, it is characterised in that：
The colour difference correcting lens group is by the 4th biconvex positive lens（7）With the second falcate positive lens（8）Gluing forms；Described first is curved
Month shape negative lens（1）, the first falcate positive lens（2）Bend towards image space, the second falcate positive lens（8）, the second falcate bears
Lens（9）Bend towards object space.
A kind of 3. object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 2, it is characterised in that：
4th biconvex positive lens（7）Meet condition：0.85≤f 7/f≤ 0.95, Nd7>1.65 Vd7<50, whereinfFor optical system
Total focal length,f 7For the 4th biconvex positive lens（7）Effective focal length, Nd7For the 4th biconvex positive lens（7）The d lines refractive index of material,
Vd7For the 4th biconvex positive lens（7）The d line Abbe constants of material；The second falcate positive lens（8）Meet condition：3≤f 8/f≤ 3.8, Nd8>1.85 Vd8<25, whereinfFor optical system total focal length,f 8For the second falcate positive lens（8）Effective Jiao
Away from, Nd8For the second falcate positive lens（8）The d lines refractive index of material, Vd8For the second falcate positive lens（8）Material d lines Ah
Shellfish constant.
A kind of 4. object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 1, it is characterised in that：
First negative meniscus（1）Meet condition：-4.1≤f 1/f≤ -3.6, Nd1<1.55 Vd1>65, whereinfFor optical system
System total focal length,f 1For the first negative meniscus（1）Effective focal length, Nd1For the first negative meniscus（1）The d lines folding of material
Penetrate rate, Vd1For the first negative meniscus（1）The d line Abbe constants of material.
A kind of 5. object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 1, it is characterised in that：
The first falcate positive lens（2）Meet condition：2.3≤f 2/f≤ 2.6, Nd2>1.85 Vd2<35, whereinfFor optical system
Total focal length,f 2For the first falcate positive lens（2）Effective focal length, Nd2For the first falcate positive lens（2）The d lines refraction of material
Rate, Vd2For the first falcate positive lens（2）The d line Abbe constants of material.
A kind of 6. object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 1, it is characterised in that：
The double-concave negative lens（3）Meet condition：-0.8≤f 3/f≤ -0.6, Nd3>1.75 Vd3<30, whereinfIt is always burnt for optical system
Away from,f 3For double-concave negative lens（3）Effective focal length, Nd3For double-concave negative lens（3）The d lines refractive index of material, Vd3It is negative saturating for concave-concave
Mirror（3）The d line Abbe constants of material.
A kind of 7. object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 1, it is characterised in that：
First biconvex positive lens（4）Meet condition：1≤f 4/f≤ 1.3, Nd4>1.85 Vd4<35, whereinfIt is always burnt for optical system
Away from,f 4For the first biconvex positive lens（4）Effective focal length, Nd4For the first biconvex positive lens（4）The d lines refractive index of material, Vd4For
First biconvex positive lens（4）The d line Abbe constants of material.
A kind of 8. object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 1, it is characterised in that：
Second biconvex positive lens（5）Meet condition：1.2≤f 5/f≤ 1.4, Nd5>1.65 Vd5>50, whereinfIt is total for optical system
Focal length,f 5For the second biconvex positive lens（5）Effective focal length, Nd5For the second biconvex positive lens（5）The d lines refractive index of material, Vd5
For the second biconvex positive lens（5）The d line Abbe constants of material；3rd biconvex positive lens（6）Meet condition：3≤f 6/f≤
3.5, Nd6<1.70 Vd6<55, whereinfFor optical system total focal length,f 6For the 3rd biconvex positive lens（6）Effective focal length, Nd6
For the 3rd biconvex positive lens（6）The d lines refractive index of material, Vd6For the 3rd biconvex positive lens（6）The d line Abbe constants of material.
A kind of 9. object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 1, it is characterised in that：
Second negative meniscus（9）Meet condition：-0.85≤f 9/f≤ -0.8, Nd9>1.85 Vd9<25, whereinfFor optics
System total focal length,f 9For the second negative meniscus（9）Effective focal length, Nd9For the second negative meniscus（9）The d lines of material
Refractive index, Vd9For the second negative meniscus（9）The d line Abbe constants of material.
10. a kind of object lens of large relative aperture low-light level television imaging pre-objective optical system as claimed in claim 1, its feature exist
In：The first falcate positive lens（2）With the double-concave negative lens（3）Between in the distance on optical axis be T23, described second
Biconvex positive lens（5）With the 3rd biconvex positive lens（6）Between in the distance on optical axis be T56, second biconvex positive lens
（5）In the thickness on optical axis be CT5, meet following condition：0.68≤（T23+T56）/ CT5≤1.30。
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| CN201720567238.1U CN207008165U (en) | 2017-05-22 | 2017-05-22 | A kind of object lens of large relative aperture low-light level television is imaged pre-objective optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997090A (en) * | 2017-05-22 | 2017-08-01 | 凯迈（洛阳）测控有限公司 | A kind of object lens of large relative aperture low-light level television is imaged pre-objective optical system |
-
2017
- 2017-05-22 CN CN201720567238.1U patent/CN207008165U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997090A (en) * | 2017-05-22 | 2017-08-01 | 凯迈（洛阳）测控有限公司 | A kind of object lens of large relative aperture low-light level television is imaged pre-objective optical system |
| CN106997090B (en) * | 2017-05-22 | 2022-07-26 | 凯迈（洛阳）测控有限公司 | Large-relative-aperture glimmer television imaging front-mounted objective lens optical system |
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