CN203365788U - Remote infrared double-field zoom optical system - Google Patents
Remote infrared double-field zoom optical system Download PDFInfo
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- CN203365788U CN203365788U CN 201320153756 CN201320153756U CN203365788U CN 203365788 U CN203365788 U CN 203365788U CN 201320153756 CN201320153756 CN 201320153756 CN 201320153756 U CN201320153756 U CN 201320153756U CN 203365788 U CN203365788 U CN 203365788U
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Abstract
The utility model discloses a remote infrared double-field zoom optical system which is composed of a front fixed group, a zooming group and a rear fixed group, wherein the front fixed group is a first positive meniscus lens, the zooming group is formed by combining a biconcave negative lens and a negative meniscus lens, and the rear fixed group is formed by combining a second positive meniscus lens and a third positive meniscus lens; the first positive meniscus lens, the biconcave negative lens, the second positive meniscus lens and the third positive meniscus lens are lenses made by adopting a germanium infrared material, and the negative meniscus lens is a lens made by adopting a selenium sulfide material; and the front surface of the biconcave negative lens and the rear surface of the second positive meniscus are of an aspheric surface structure. The remote infrared double-field zoom optical system is simple and compact in structure, can realize three functions of zooming, focusing and temperature compensation of a double-filed infrared zoom optical system, and ensures the double-field infrared optical system to have good imaging quality for both a far target and a near target under the condition of different environmental temperatures and switching between a large filed and a small field.
Description
Technical field
The utility model belongs to optical technical field, is specifically related to a kind of remote infrared double-view field varifocal optical system.
Background technology
The double-view field infrared system is because meeting the need of work of a plurality of patterns, with respect to monoscopic infrared system and the complex structure that can't meet a plurality of patterns requirements, resetting difficulty is large, zoom process mid-focal length precision and light axis consistency are difficult to the continuous vari-focus infrared system guaranteed, the double-view field infrared system more has practical value.Dual field-of-view infrared optical system generally has two kinds of zoom modes: a kind of is cut-in type zoom mode, this mode by incision, cut out the zoom group and convert visual field.The characteristics of cut-in type are that moving meter is many, and the incision of zoom group needs larger space, thereby the lateral dimension of optical system is larger, and zoom group incision repeatedly also easily causes the visual field light axis consistency variation of two; A kind of is axial displacement, and this mode is that the variation of scioptics group axially spaced-apart changes the focal length of system by along optical axis parallel zoom group, converting visual field.Be characterized in that moving meter is few, quality is light, does not take horizontal dimensional space, and visual field switching repeatedly is difficult for causing the skew of light axis consistency, has better advantage in use.
The utility model content
For the prior art above shortcomings, it is 50 millimeters～150 millimeters that the purpose of this utility model is to provide a kind of focal length, the remote infrared double-view field varifocal optical system that f-number is 1.0.Diffraction element is not used in this optical system inside, simple in structure, compact, can realize zoom, focusing and three kinds of functions of temperature compensation of dual field-of-view infrared optical system simultaneously, guarantee that dual field-of-view infrared optical system is under different environment temperatures and large small field of view switching condition, still can meet the high picture element requirement of mating with 25 μ m infrared focal plane detectors, far away, close-target are all had to good image quality.
For achieving the above object, the technical scheme that the utility model is taked: this remote infrared double-view field varifocal optical system, by front fixedly group, zoom group and rear fixedly group, formed, it is characterized in that: described front fixedly group is first positive meniscus lens, described zoom group is constituted by double concave type negative lens and diverging meniscus lens, and described rear fixedly group is constituted by the second positive meniscus lens and the 3rd positive meniscus lens; The lens that described the first positive meniscus lens, double concave type negative lens, the second positive meniscus lens and the 3rd positive meniscus lens adopt the germanium infra-red material to make, the lens that described diverging meniscus lens adopts the selenium sulfide material to make; Described double concave type negative lens front surface and the second positive meniscus lens rear surface all adopt non-spherical structure.
The high order aspheric surface equation of described double concave type negative lens front surface is:
The secondary aspherical equation of described the second positive meniscus lens rear surface is:
Wherein: Z is the corresponding vertical range of aspheric surface axle, and C is vertex curvature, and r is the radial distance from the aspheric surface axle.
Adopt the beneficial effect of technique scheme: this remote infrared double-view field varifocal optical system adopts five slice structure forms, do not use diffraction element, change the focal length of whole system by the axial location of mobile two zoom groups (double concave type negative lens and diverging meniscus lens), guarantee that in zoom, focusing and temperature compensation process, the image planes position does not all change, finally be imaged on infrared focal plane detector.Optical system the first positive meniscus lens, double concave type negative lens, the second positive meniscus lens and the 3rd positive meniscus lens all adopt the germanium infra-red material, and described diverging meniscus lens adopts the selenium sulfide material, for compensate for chromatic aberration.Described double concave type negative lens front surface and the second positive meniscus lens rear surface all adopt non-spherical structure, can further improve thermal characteristics and dispersion characteristics.Compared with prior art, it is simple in structure, compact, optical axis stable, and reliability is high, realize zoom, focusing and three kinds of functions of temperature compensation of infrared double-view field varifocal optical system simultaneously, can meet the high-resolution picture element requirement of large small field of view in 10m～∞ scope under-40 ℃～+ 50 ℃ environmental baselines.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of long burnt small field of view state.
Fig. 3 is short burnt state MTF figure.
Fig. 4 is short burnt state point range figure.
Fig. 5 is long burnt state MTF figure.
Fig. 6 is long burnt state point range figure.
Fig. 7 is the short burnt state MTF figure of 10m limited distance.
Fig. 8 is the short burnt state point range figure of 10m limited distance.
Fig. 9 is the long burnt state MTF figure of 10m limited distance.
Figure 10 is the long burnt state point range figure of 10m limited distance.
Figure 11 is 50 ℃ of short burnt state MTF figure of infinite distance distance.
Figure 12 is 50 ℃ of short burnt state point range figures of infinite distance distance.
Figure 13 is 50 ℃ of burnt state MTF figure of infinite distance distance.
Figure 14 is 50 ℃ of burnt state point range figures of infinite distance distance.
Figure 15 is-40 ℃ of short burnt state MTF figure of infinite distance distance.
Figure 16 is-40 ℃ of short burnt state point range figures of infinite distance distance.
Figure 17 is-40 ℃ of burnt state MTF figure of infinite distance distance.
Figure 18 is-40 ℃ of burnt state point range figures of infinite distance distance.
Embodiment
Focal length as shown in Figure 1, 2 is 50 millimeters～150 millimeters, the remote infrared double-view field varifocal optical system that f-number is 1.0, version adopts five slice structures, front fixedly group, zoom group and rear fixedly group, consists of, and it is imaged on infrared focal plane detector 6.Wherein front fixedly group consists of the first positive meniscus lens 1, and the zoom group is constituted by double concave type negative lens 2 and diverging meniscus lens 3, and fixedly group consists of the second positive meniscus lens 4 and the 3rd positive meniscus lens 5.The lens that described the first positive meniscus lens 1, double concave type negative lens 2, the second positive meniscus lens 4 and the 3rd positive meniscus lens 5 adopt the germanium infra-red material to make, the lens that described diverging meniscus lens 3 adopts the selenium sulfide material to make; Described double concave type negative lens 2 front surfaces and the second positive meniscus lens 4 rear surfaces all adopt non-spherical structure, and wherein the high order aspheric surface equation of double concave type negative lens front surface is:
The secondary aspherical equation of the second positive meniscus lens rear surface is:
Wherein: Z is the corresponding vertical range of aspheric surface axle, and C is vertex curvature, and r is the radial distance from the aspheric surface axle.
Focal distance f '=50mm～150mm, f-number is that 1.0 remote infrared double-view field varifocal optical system parameters are as follows:
Change the function of the large small field of view of focal length realization switching of whole system by the axial location of mobile zoom group (double concave type negative lens 2 and diverging meniscus lens 3), when the close front fixedly group (the first positive meniscus lens 1) of zoom group (double concave type negative lens 2 and diverging meniscus lens 3), system is in short Jiao, large visual field state; When zoom group (double concave type negative lens 2 and diverging meniscus lens 3) during away from front fixedly group (the first positive meniscus lens 1), system is in long burnt, the small field of view state.Different temperature conditions and far and near target all can cause the out of focus of infrared optical system, can realize active compensation and the focusing function under different temperatures by meticulous mobile zoom group (double concave type negative lens 2 and diverging meniscus lens 3) simultaneously, the image planes of double-view field infrared zoom optical system are all overlapped with infrared focal plane detector 6 under condition of different temperatures and different target distance condition, thereby guarantee that system imaging is clear.
Fig. 3 to Figure 18 is that focal length is 50 millimeters～150 millimeters, the remote double visual field infrared zoom optical system that the F number is 1.0, under large small field of view and condition of different temperatures to the image quality design results of infinite distance target, 10 meters limited distance target focusing.Can find out from the graph, this remote infrared double-view field varifocal optical system image quality under two visual field conditions all meets request for utilization, the point spread function diameter of full visual field all is less than 25 μ m, the diffraction limit when mtf value under characteristic frequency meets Nyquist frequency 20lp/mm, this double-view field infrared zoom optical system good imaging quality, simple in structure, optical axis stable, reliability is high, meets the high-resolution picture element requirement of large small field of view in 10m～∞ scope under-40 ℃～+ 50 ℃ environmental baselines.
Claims (3)
1. a remote infrared double-view field varifocal optical system, by front fixedly group, zoom group and rear fixedly group, formed, it is characterized in that: described front fixedly group is first positive meniscus lens, described zoom group is constituted by double concave type negative lens and diverging meniscus lens, and described rear fixedly group is constituted by the second positive meniscus lens and the 3rd positive meniscus lens; The lens that described the first positive meniscus lens, double concave type negative lens, the second positive meniscus lens and the 3rd positive meniscus lens adopt the germanium infra-red material to make, the lens that described diverging meniscus lens adopts the selenium sulfide material to make; Described double concave type negative lens front surface and the second positive meniscus lens rear surface all adopt non-spherical structure.
2. remote infrared double-view field varifocal optical system according to claim 1, it is characterized in that: described aspheric surface parameter is as follows:
Described double concave type negative lens high order aspheric surface equation is:
The secondary aspherical equation of described the second positive meniscus lens is:
?wherein: Z is the corresponding vertical range of aspheric surface axle, and C is vertex curvature, and r is the radial distance from the aspheric surface axle.
3. remote infrared double-view field varifocal optical system according to claim 1 is characterized in that: focal distance f '=50mm～150mm, f-number is that 1.0 remote infrared double-view field varifocal optical system parameters are as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320153756 CN203365788U (en) | 2013-04-01 | 2013-04-01 | Remote infrared double-field zoom optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320153756 CN203365788U (en) | 2013-04-01 | 2013-04-01 | Remote infrared double-field zoom optical system |
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| Publication Number | Publication Date |
|---|---|
| CN203365788U true CN203365788U (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320153756 Expired - Lifetime CN203365788U (en) | 2013-04-01 | 2013-04-01 | Remote infrared double-field zoom optical system |
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| Country | Link |
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| CN (1) | CN203365788U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852874A (en) * | 2014-03-14 | 2014-06-11 | 山东神戎电子股份有限公司 | Continuous zooming infrared lens with extra large zoom ratio |
| CN104267484A (en) * | 2014-02-20 | 2015-01-07 | 山东神戎电子股份有限公司 | Small size uncooled dual-field-of-view infrared optical system |
| CN108152937A (en) * | 2017-11-13 | 2018-06-12 | 长春理工大学 | In infrared/long wave Zooming-projection camera lens |
-
2013
- 2013-04-01 CN CN 201320153756 patent/CN203365788U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267484A (en) * | 2014-02-20 | 2015-01-07 | 山东神戎电子股份有限公司 | Small size uncooled dual-field-of-view infrared optical system |
| CN104267484B (en) * | 2014-02-20 | 2017-01-25 | 山东神戎电子股份有限公司 | Small size uncooled dual-field-of-view infrared optical system |
| CN103852874A (en) * | 2014-03-14 | 2014-06-11 | 山东神戎电子股份有限公司 | Continuous zooming infrared lens with extra large zoom ratio |
| CN103852874B (en) * | 2014-03-14 | 2016-06-08 | 山东神戎电子股份有限公司 | Super big zoom ratio continuous vari-focus infrared lens |
| CN108152937A (en) * | 2017-11-13 | 2018-06-12 | 长春理工大学 | In infrared/long wave Zooming-projection camera lens |
| CN108152937B (en) * | 2017-11-13 | 2020-04-14 | 长春理工大学 | Infrared medium/long wave zooming projection lens |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |
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| CX01 | Expiry of patent term |