CN109387931A - A kind of short-wave infrared continuous magnification lens - Google Patents
A kind of short-wave infrared continuous magnification lens Download PDFInfo
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- CN109387931A CN109387931A CN201811313531.0A CN201811313531A CN109387931A CN 109387931 A CN109387931 A CN 109387931A CN 201811313531 A CN201811313531 A CN 201811313531A CN 109387931 A CN109387931 A CN 109387931A
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- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 238000003384 imaging method Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 6
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- 238000009738 saturating Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 230000005855 radiation Effects 0.000 description 6
- 238000003331 infrared imaging Methods 0.000 description 5
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
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- 239000003595 mist Substances 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000004501 airglow Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
Abstract
The present invention relates to short-wave infrared technical field of imaging, when the ambient temperature changes for existing continuous vari-focus system, in zooming procedure only in some focal position image clearly, remaining focal position image is fuzzy cannot to be even imaged, the problem of easily causing target to lose provides a kind of short-wave infrared continuous magnification lens.Camera lens includes first fixed group, zoom group, aperture diaphragm, compensation group and fixes group afterwards；Preceding fixed group is followed successively by the first negative lens, the first biconvex positive lens and the first falcate positive lens from left to right；Zoom group is followed successively by the first cemented doublet and the second double-concave negative lens from left to right；Compensation group is followed successively by the second biconvex positive lens and the second cemented doublet from left to right；Fixed group is followed successively by third double-concave negative lens, third falcate positive lens, third negative lens and the 4th biconvex positive lens from left to right afterwards；First fixed group moves left and right according to environment temperature along optical axis direction；Zoom group is moved left and right with compensation group along optical axis direction.
Description
Technical field
The present invention relates to short-wave infrared technical field of imaging, and in particular to a kind of short-wave infrared continuous magnification lens.
Background technique
The light energy of short infrared wave band (0.9~1.7 μm) under the conditions ofs the lower mist of visibility, rain, dirt etc. have compared with
High transmitance, and the spectral radiance of the night sky concentrates on short infrared wave band under the conditions of full moon and airglow, therefore shortwave is red
Outer imaging system can be under the conditions ofs low light conditions, the mist of low visibility, rain, dirt etc. to object blur-free imaging.
In addition, different using the heat radiation of scenery own transmission from long wave, medium-wave infrared imaging, shortwave imaging is main to be utilized
Generally existing short wave infrared radiation is imaged in room temperature object reflection environment.It is similar with Visible imaging system, work as object
Temperature be increased to when can emit sufficiently strong short wave infrared radiation, short-wave infrared imaging also can receive the short of object itself radiation
Wave energy is imaged.
Therefore, compared to VISIBLE LIGHT SYSTEM, short-wave infrared imaging system has to be imaged round the clock, low-light (level), low visibility
The high feature of image sensitivity under the conditions of mist, rain, dirt；Long wave, medium-wave infrared imaging are compared, short-wave infrared imaging has resolution ratio
It is high, without cryogenic refrigeration, the visible optical lens of low cost, the feature that size is small, power is low can be used.
Continuous vari-focus system has the characteristics that observe target on a large scale and small range detailed survey.However, when environment temperature is sent out
When changing, leads to the refractive index of optical element, curvature, thickness, change occurred at intervals, make the optimum image plane position of imaging system
It shifts.For continuous vari-focus system, the optimal focal plane position of different focal length position is different, then causes system to exist
Only the image clearly in some focal position, remaining focal position image are obscured or even cannot be imaged in zooming procedure, cause mesh
Target is lost, and is not able to satisfy the application demand to target Continuous tracking, monitoring.
Summary of the invention
The purpose of the present invention is overcoming existing continuous vari-focus system when the ambient temperature changes, only exist in zooming procedure
Image clearly when some focal position, the fuzzy deficiency that cannot be even imaged, target is easily caused to lose of remaining focal position image,
And provide a kind of short-wave infrared continuous magnification lens.
To achieve the above object, present invention provide the technical scheme that a kind of short-wave infrared continuous magnification lens, special
Place is: zoom group that the focal power including being sequentially coaxially arranged from left to right be positive first fixed group, focal power are negative, hole
Be positive latter fixed group of the compensation group and focal power that diameter diaphragm, focal power are positive；The left side of preceding fixed group is object space, rear fixed
The right side of group is image space；Fixed group is made of three lens before described, is followed successively by concave surface first to aperture diaphragm from left to right
Negative lens, the first biconvex positive lens and the first falcate positive lens；The zoom group is made of three lens, from left to right successively
For the first cemented doublet and the second double-concave negative lens that focal power is negative, the first cemented doublet is from left to right by the second bent moon
Shape positive lens and the first double-concave negative lens composition；The compensation group is made of three lens, is followed successively by the second biconvex from left to right
The second cemented doublet that positive lens and focal power are positive；Second cemented doublet is from left to right by concave surface backwards to aperture diaphragm
Second negative lens and third biconvex positive lens composition；The surface of the second biconvex positive lens is arranged in the aperture diaphragm；After described
Fixed group is made of four lens, is followed successively by third double-concave negative lens from left to right, third falcate positive lens, concave surface bend towards hole
The third negative lens and the 4th biconvex positive lens of diameter diaphragm；Fixed group can be moved according to environment temperature along optical axis direction or so before described
It is dynamic, for compensating camera lens focal length end heat differential；The zoom group can be moved left and right with compensation group along optical axis direction, for realizing continuous
Varifocal imaging.
Further, when environment temperature changes to t ' by t, fixed group is mobile to image space before described；When environment temperature is by t
When changing to t ", fixed group is mobile to object space before described；Wherein, 0 DEG C of 40 DEG C of < t <, -60 DEG C≤t '≤0 DEG C, 40 DEG C≤t "≤
75℃。
When further, from short focus state to focal length state change, zoom group is moved towards with compensation group；From focal length state
When to short focus state change, zoom group is moved away from compensation group.
Further, above-mentioned preceding fixed group, zoom group, compensation group, rear fixed group meet following relational expression:
0.52≤f1/ft≤0.58；
-0.15≤f2/ft≤-0.10；
0.13≤f3/ft≤0.16；
0.82≤f4/ft≤0.86；
0.28≤β2w/β2t≤0.32；
β2w≤-0.30；
Wherein, f1 is the focal length value of preceding fixed group,
F2 is the focal length value of zoom group,
F3 is the focal length value of compensation group,
The focal length value of f4 fixed group after being,
Ft is the focal length value of camera lens most focal length,
β2wFor magnifying power of the zoom group in short focus,
β2tFor magnifying power of the zoom group in focal length.
Further, to correct system second order spectrum, above-mentioned first biconvex positive lens, the second falcate positive lens material are equal
Using HFK61.Select low dispersion material that can correct the second order spectrum aberration of 0.95~1.7 mu m waveband.
Further, 0.6~1mm is divided between first negative lens and the first biconvex positive lens, first biconvex is just
0.2~0.6mm is divided between lens and the first falcate positive lens；The interval of first balsaming lens and the second double-concave negative lens
For 4~4.8mm；0.2~0.6mm is divided between second biconvex positive lens and the second cemented doublet；The third concave-concave
0.2~0.6mm is divided between negative lens and third falcate positive lens；The third falcate positive lens and third negative lens
Between be divided into 23~23.5mm；1.5~2mm is divided between the falcate third negative lens and the 4th biconvex positive lens.
Further, the airspace between the preceding fixed group and zoom group is 6.00mm~48.35mm；The zoom
Airspace between group and compensation group is 3.00mm~64.24mm；Airspace between the compensation group and rear fixed group
For 3.00mm~21.89mm；Airspace between 4th biconvex positive lens and image space is 8.5~10mm.
Compared with prior art, the invention has the advantages that
1, camera lens provided by the invention compensates the shape of two constituent elements (zoom group and compensation group) axial movement zoom using positive group
Formula, zoom group 2 and compensation group 3, along optical axis direction relative motion, realize short-wave infrared continuous magnification lens picture in zooming procedure
The stabilization of face position；The ability in the imaging of short infrared wave band continuous vari-focus is realized, zoom form is simple, compact-sized；Tool
There is the characteristics of big zoom ratio and big visual field.
2, the preceding fixed group of camera lens provided by the invention is used as focusing group, by the axial position of group 1 fixed before adjusting into
Row is focused, and can keep good focal plane consistency in zooming procedure in wide temperature range (- 60 DEG C~75 DEG C).
3, lens construction provided by the invention is simple, light-weight, focal length value variable quantity is small.Wide temperature range (- 60 DEG C~
75 DEG C) in, transmission function of each visual field at spatial frequency 33lp/mm is all larger than 0.5, has good image quality.
Detailed description of the invention
Fig. 1 is the short focus structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the middle burnt structural schematic diagram of the embodiment of the present invention；
Fig. 3 is the focal length structure schematic diagram of the embodiment of the present invention；
Fig. 4 is the focal length position optical transfer function of the embodiment of the present invention under room temperature；
Fig. 5 is the middle burnt position optical transfer function of the embodiment of the present invention under room temperature；
Fig. 6 is the short focus position optical transfer function of the embodiment of the present invention under room temperature；
When Fig. 7 is -60 DEG C, fixed group first (focusing group) is mobile along light incident direction (to image space) in the embodiment of the present invention
0.1mm, camera lens focal length position optical transfer function；
When Fig. 8 is -60 DEG C, fixed group first (focusing group) position is constant in the embodiment of the present invention, burnt position optics in camera lens
Transmission function；
When Fig. 9 is -60 DEG C, fixed group first (focusing group) position is constant in the embodiment of the present invention, camera lens short focus position optics
Transmission function；
When Figure 10 is 75 DEG C, fixed group first (focusing group) inverse light incident direction (to object space) is mobile in the embodiment of the present invention
0.15mm, camera lens focal length position optical delivery number；
When Figure 11 is 75 DEG C, fixed group first (focusing group) position is constant in the embodiment of the present invention, burnt position optics in camera lens
Transmission function；
When Figure 12 is 75 DEG C, fixed group first (focusing group) position is constant in the embodiment of the present invention, camera lens short focus position optics
Transmission function；
Figure 13 is focal length of embodiment of the present invention position field curvature, distortion curve；
Figure 14 is burnt position field curvature, distortion curve in the embodiment of the present invention；
Figure 15 is short focus of embodiment of the present invention position field curvature, distortion curve.
Each label is described as follows in figure:
1-first fixed group；
11-the first negative lens, the 12-the first biconvex positive lens, the 13-the first falcate positive lens；
2-zoom groups；
21-the second falcate positive lens, the 22-the first double-concave negative lens, the 23-the second double-concave negative lens；
3-compensation groups；
31-the second biconvex positive lens, the 32-the second negative lens, 33-third biconvex positive lens；
4-fix group afterwards；41-third double-concave negative lens, 42-third falcate positive lens, 43-third negative lenses,
44-the four biconvex positive lens.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
The present embodiment provides a kind of short-wave infrared continuous magnification lens, target surface is suitable for having a size of 9.6mm × 7.68mm
Type photodetector is InGaAS, and pixel dimension is 15 μm, the short-wave infrared uncooled detector of 640 × 512 resolution ratio.Camera lens is total
A length of 160mm, maximum caliber 47mm have the characteristics that transmitance is high, at low cost, small in size, light-weight；Camera lens service band
0.95~1.7 μm of short infrared wave band, F#:3.6~5.5；Continuous vari-focus within the scope of 17.5~175mm of focal length, horizontal field of view angle
31.6 °~3.05 °, it is suitable for 9.6 × 7.68mm short-wave infrared detector.It can be in -60 DEG C~75 DEG C of wide temperature range
Keep the steady and audible of image during continuous vari-focus, greatly improve stability, the environmental suitability of camera lens, reduce target with
Losing probability during track, monitoring, and improve the detectivity of the target under low-light (level), low-visibility conditions.
The common aluminum alloy materials of lens barrel materials'use of camera lens, thermal expansion coefficient are 236 × 10-7/K.Camera lens material
All using common visible light glass, and all spherical surfaces, the cost and difficulty of processing of camera lens are greatly reduced, improving can
By property.
As shown in Figure 1 to Figure 3, short-wave infrared continuous magnification lens include that the focal power being sequentially coaxially arranged from left to right is
The compensation group 3 that zoom group 2, aperture diaphragm (not shown), the focal power that positive preceding fixed group 1, focal power are negative are positive with
And the rear fixed group 4 that focal power is positive；The left side of preceding fixed group 1 is object space, and the right side of rear fixed group 4 is image space；First biconvex
Positive lens 12,13 material of the second falcate positive lens are all made of HFK61.
Preceding fixed group 1 is made of three lens, be followed successively by from left to right the first negative lens 11 from concave surface to aperture diaphragm, the
One biconvex positive lens 12 and the first falcate positive lens 13.
Zoom group 2 is made of three lens, is followed successively by the first cemented doublet and second that focal power is negative from left to right
Double-concave negative lens 23, the first cemented doublet is from left to right by 22 groups of the second falcate positive lens 21 and the first double-concave negative lens
At.
Compensation group 3 is made of three lens, is followed successively by the second biconvex positive lens 31 from left to right and focal power is positive
Two cemented doublets；Second cemented doublet is from left to right by concave surface backwards to the second negative lens 32 and third biconvex of aperture diaphragm
Positive lens 33 forms.
The surface of the second biconvex positive lens 31 is arranged in aperture diaphragm.
Fixed group 4 is made of four lens afterwards, and it is just saturating to be followed successively by third double-concave negative lens 41, third falcate from left to right
Mirror 42, concave surface bend towards the third negative lens 43 and the 4th biconvex positive lens 44 of aperture diaphragm；
0.88mm, the first biconvex positive lens 12 and the first bent moon are divided between first negative lens 11 and the first biconvex positive lens 12
0.5mm is divided between shape positive lens 13；4.56mm is divided between first balsaming lens and the second double-concave negative lens 23；Second biconvex is just
0.5mm is divided between lens 31 and the second cemented doublet；Between third double-concave negative lens 41 and third falcate positive lens 42
It is divided into 0.5mm；23.2mm is divided between third falcate positive lens 42 and third negative lens 43；Falcate third negative lens 43 with
1.6mm is divided between 4th biconvex positive lens 44.
Airspace between preceding fixed group 1 and zoom group 2 is 6.00mm~48.35mm；Zoom group 2 and compensation group 3 it
Between airspace be 3.00mm~64.24mm；Airspace between compensation group 3 and rear fixed group 4 be 3.00mm~
21.89mm；Airspace between 4th biconvex positive lens 44 and image space is 9mm.
Preceding fixed group 1, zoom group 2, compensation group 3, rear fixed group 4 meet following relational expression:
0.52≤f1/ft≤0.58；
-0.15≤f2/ft≤-0.10；
0.13≤f3/ft≤0.16；
0.82≤f4/ft≤0.86；
0.28≤β2w/β2t≤0.32；
β2w≤-0.30；
Wherein, f1 is the focal length value of preceding fixed group 1,
F2 is the focal length value of zoom group 2,
F3 is the focal length value of compensation group 3,
The focal length value of f4 fixed group 4 after being,
Ft is the focal length value of camera lens most focal length,
β2wFor magnifying power of the zoom group 2 in short focus,
β2tFor magnifying power of the zoom group 2 in focal length.
Preceding fixed group 1 can be moved left and right according to environment temperature along optical axis direction, for compensating camera lens focal length end heat differential；Work as ring
When border temperature changes to t ' by t, fixed group 1 is mobile to image space before described；It is solid before described when environment temperature changes to t " by t
Surely group 1 is mobile to object space；Wherein, 0 DEG C 40 DEG C, -60 DEG C≤t '≤0 DEG C, 40 DEG C≤t "≤75 DEG C of < t <.
Zoom group 2 can be moved left and right with compensation group 3 along optical axis direction, for realizing continuous vari-focus imaging.From short focus state
When to focal length state change, zoom group 2 is moved towards with compensation group 3；When from focal length state to short focus state change, zoom group 2
It is moved away from compensation group 3.Airspace i.e. between zoom group 2 and preceding fixed group 1 becomes larger always；Compensation group 3 is fixed with rear
Airspace between group 4 becomes larger always；Airspace between zoom group 2 and compensation group 3 becomes smaller always.
In wide temperature range (- 60 DEG C~75 DEG C), the image of camera lens focal length is adjusted clear by first fixed group (focusing group)
After clear, fixed group (focusing group) position is constant before keeping；By adjusting zoom group and compensation group, can object to different distance it is clear
Clear imaging, and be consistent the image planes position of each focal position of camera lens when variation of ambient temperature, i.e. each focal position parfocalization face.
Fig. 4 to fig. 6 is under room temperature, the focal length position of the embodiment of the present invention, middle burnt position, short focus position optical delivery letter
Number.
As shown in Figure 7 to 9, when environment temperature is -60 DEG C, camera lens focal length end image quality is declined, preceding fixed group 1
After (focusing group) moves 0.1mm along radiation direction, camera lens focal length end image quality is identical as under room temperature.
As shown in fig. 7, lens focus variable quantity is 0.5mm at this time, 1 (focusing group) position of fixed group is constant before keeping, will
Camera lens is by focal length position continuous vari-focus to short focus position, and in zooming procedure, constant, and each focal length position is stablized in camera lens position of focal plane
Setting has preferable image quality.
As shown in Figure 8, Figure 9, burnt, short focus position transfer function is all larger than 0.5 at 33lp/mm in camera lens, when with room temperature
It is identical, and focal length variations amount is respectively 0.2mm, 0.03mm, each focal position focal length value variable quantity very little.
As shown in Figure 10 to Figure 12, when environment temperature is 75 DEG C, camera lens focal length end image quality is declined, preceding fixed group 1
After (focusing group) inverse radiation direction (to object space) mobile 0.15mm, camera lens focal length end image quality is identical as under room temperature.
As shown in Figure 10, lens focus variable quantity is 0.64mm at this time, and 1 (focusing group) position of fixed group is constant before keeping,
By camera lens by focal length position continuous vari-focus to short focus position, in zooming procedure, constant, and each focal length is stablized in camera lens position of focal plane
There is preferable image quality in position.
As shown in Figure 11, Figure 12, burnt, short focus position transfer function is all larger than 0.5 at 33lp/mm in camera lens, with room temperature
Shi Xiangtong, and focal length variations amount is respectively 0.22mm, 0.05mm, each focal position focal length value variable quantity very little.
As can be seen from Table 1, after temperature change, system focal length variable quantity very little, system is stable and reliable in work.
The focal length value of the system at different temperatures of the invention of table 1
It can by the curvature of field, the distortion figure of Figure 13 to the wide temperature range parfocalization face Figure 15 short-wave infrared continuous magnification lens designed
To find out, the long, medium and short coke distortion of camera lens is respectively less than 2%, and human eye is not noticeable, has good imaging effect.
Claims (7)
1. a kind of short-wave infrared continuous magnification lens, it is characterised in that: the focal power including being sequentially coaxially arranged from left to right is
The compensation group (3) and light focus that zoom group (2), aperture diaphragm, the focal power that positive preceding fixed group of (1), focal power is negative are positive
Spend rear fixed group (4) being positive；The left side of preceding fixed group (1) is object space, and the right side for fixing group (4) afterwards is image space；
Fixed group (1) is made of three lens before described, is followed successively by first negative lens of the concave surface to aperture diaphragm from left to right
(11), the first biconvex positive lens (12) and the first falcate positive lens (13)；
The zoom group (2) is made of three lens, is followed successively by the first cemented doublet and that focal power is negative from left to right
Two double-concave negative lens (23), the first cemented doublet is from left to right by the second falcate positive lens (21) and the first double-concave negative lens
(22) it forms；
The compensation group (3) is made of three lens, is followed successively by the second biconvex positive lens (31) from left to right and focal power is positive
The second cemented doublet；Second cemented doublet is from left to right by concave surface backwards to the second negative lens (32) of aperture diaphragm and
Three biconvex positive lens (33) composition；
The aperture diaphragm setting is in the second biconvex positive lens (31) close to the surface of object space；
Fixed group (4) are made of four lens after described, are followed successively by third double-concave negative lens (41), third falcate from left to right
Positive lens (42), concave surface bend towards the third negative lens (43) and the 4th biconvex positive lens (44) of aperture diaphragm；
Fixed group (1) can be moved left and right according to environment temperature along optical axis direction before described, for compensating camera lens focal length end heat differential；Institute
Stating zoom group (2) and compensation group (3) can move left and right along optical axis direction, for realizing continuous vari-focus imaging.
2. a kind of short-wave infrared continuous magnification lens according to claim 1, it is characterised in that:
When environment temperature changes to t ' by t, fixed group (1) is mobile to image space before described；
When environment temperature changes to t " by t, fixed group (1) is mobile to object space before described；
Wherein, 0 DEG C 40 DEG C, -60 DEG C≤t '≤0 DEG C, 40 DEG C≤t "≤75 DEG C of < t <.
3. a kind of short-wave infrared continuous magnification lens according to claim 2, it is characterised in that: from short focus state to focal length
When state change, zoom group (2) is moved towards with compensation group (3)；When from focal length state to short focus state change, zoom group (2)
It is moved away from compensation group (3).
4. a kind of short-wave infrared continuous magnification lens according to claim 3, it is characterised in that: preceding fixed group (1),
Zoom group (2), compensation group (3), fixed group (4) meet following relational expression afterwards:
0.52≤f1/ft≤0.58；
-0.15≤f2/ft≤-0.10；
0.13≤f3/ft≤0.16；
0.82≤f4/ft≤0.86；
0.28≤β2w/β2t≤0.32；
β2w≤-0.30；
Wherein, f1 is the focal length value of preceding fixed group (1),
F2 is the focal length value of zoom group (2),
F3 is the focal length value of compensation group (3),
F4 fixes the focal length value of group (4) after being,
Ft is the focal length value of camera lens most focal length,
β2wFor magnifying power of the zoom group (2) in short focus,
β2tFor magnifying power of the zoom group (2) in focal length.
5. a kind of short-wave infrared continuous magnification lens according to claim 4, it is characterised in that: first biconvex is just saturating
Mirror (12), second falcate positive lens (13) material are all made of HFK61.
6. a kind of short-wave infrared continuous magnification lens according to any one of claims 1 to 5, it is characterised in that: described first
It is divided into 0.6~1mm between negative lens (11) and the first biconvex positive lens (12),
0.2~0.6mm is divided between first biconvex positive lens (12) and the first falcate positive lens (13)；
4~4.8mm is divided between first balsaming lens and the second double-concave negative lens (23)；
0.2~0.6mm is divided between second biconvex positive lens (31) and the second cemented doublet；
0.2~0.6mm is divided between the third double-concave negative lens (41) and third falcate positive lens (42)；
23~23.5mm is divided between the third falcate positive lens (42) and third negative lens (43)；
1.5~2mm is divided between the falcate third negative lens (43) and the 4th biconvex positive lens (44).
7. a kind of short-wave infrared continuous magnification lens according to claim 6, it is characterised in that:
Airspace before described between fixed group (1) and zoom group (2) is 6.00mm~48.35mm；
Airspace between the zoom group (2) and compensation group (3) is 3.00mm~64.24mm；
Airspace between the compensation group (3) and rear fixed group (4) is 3.00mm~21.89mm；
Airspace between 4th biconvex positive lens (44) and image space is 8.5~10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811313531.0A CN109387931B (en) | 2018-11-06 | 2018-11-06 | Short wave infrared continuous zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811313531.0A CN109387931B (en) | 2018-11-06 | 2018-11-06 | Short wave infrared continuous zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109387931A true CN109387931A (en) | 2019-02-26 |
| CN109387931B CN109387931B (en) | 2023-12-08 |
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Cited By (4)
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| JP2019174712A (en) * | 2018-03-29 | 2019-10-10 | 富士フイルム株式会社 | Lens device |
| CN111221115A (en) * | 2020-01-20 | 2020-06-02 | 中国科学院西安光学精密机械研究所 | Large-zoom-ratio short-wave infrared continuous zoom lens |
| CN112817134A (en) * | 2020-11-27 | 2021-05-18 | 河北汉光重工有限责任公司 | Short-wave infrared wide-spectrum four-component telephoto continuous zooming optical system |
| CN113625437A (en) * | 2021-08-05 | 2021-11-09 | 西安科佳光电科技有限公司 | High-zoom-ratio high-definition continuous zooming optical system |
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| JP2019174712A (en) * | 2018-03-29 | 2019-10-10 | 富士フイルム株式会社 | Lens device |
| US10895723B2 (en) | 2018-03-29 | 2021-01-19 | Fujifilm Corporation | Lens device |
| CN111221115A (en) * | 2020-01-20 | 2020-06-02 | 中国科学院西安光学精密机械研究所 | Large-zoom-ratio short-wave infrared continuous zoom lens |
| CN112817134A (en) * | 2020-11-27 | 2021-05-18 | 河北汉光重工有限责任公司 | Short-wave infrared wide-spectrum four-component telephoto continuous zooming optical system |
| CN112817134B (en) * | 2020-11-27 | 2022-07-01 | 河北汉光重工有限责任公司 | Short-wave infrared wide-spectrum four-component telephoto continuous zooming optical system |
| CN113625437A (en) * | 2021-08-05 | 2021-11-09 | 西安科佳光电科技有限公司 | High-zoom-ratio high-definition continuous zooming optical system |
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