CN104267484B - Small size uncooled dual-field-of-view infrared optical system - Google Patents

Small size uncooled dual-field-of-view infrared optical system Download PDF

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CN104267484B
CN104267484B CN201410057627.0A CN201410057627A CN104267484B CN 104267484 B CN104267484 B CN 104267484B CN 201410057627 A CN201410057627 A CN 201410057627A CN 104267484 B CN104267484 B CN 104267484B
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meniscus lens
positive meniscus
lens
optical system
field
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CN104267484A (en
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刘涛
徐玉惠
陈大明
桑建国
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Shandong Sheenrun Optics Electronics Co Ltd
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Shandong Sheenrun Optics Electronics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0881—Compact construction
    • G01J5/0884—Monolithic
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
    • G02B27/4211—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant correcting chromatic aberrations

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Lenses (AREA)

Abstract

The invention provides a small size uncooled dual-field-of-view infrared optical system which comprises a first positive meniscus lens and a detector. A biconcave lens, a second positive meniscus lens, a negative meniscus lens and a third positive meniscus lens are sequentially arranged from the first positive meniscus lens to the detector along the optical axis; the first positive meniscus lens, the second positive meniscus lens and the third positive meniscus lens each have positive diopter, and the biconcave lens and the negative meniscus lens each have negative diopter. Both the curved surface S3 of the biconcave lens and the curved surface S7 of the negative meniscus lens are aspheric surfaces, and the aspheric surface S7 is further provided with a binary diffraction surface. The lenses of different types are reasonably arranged and the positive diopter and the negative diopter of the lenses are selected, so that the whole dual-field-of-view infrared optical system has a smaller size and a larger zooming ratio, has a larger zooming range under the switching conditions of a narrow field of view and a wide field of view, and is suitable for occasions with small size requirements for infrared optical systems.

Description

Small-size uncooled double-view-field infrared optical system
Technical Field
The invention relates to a small-size uncooled dual-field-of-view infrared optical system, in particular to a small-size uncooled dual-field-of-view infrared optical system with positive and negative diopters selected by reasonably distributing a positive meniscus lens, a biconcave lens and a negative meniscus lens.
Background
The infrared thermal imaging system is a high-tech product which utilizes the principle that all objects in the nature with the temperature higher than absolute zero (-273 ℃) radiate infrared rays at every moment, and simultaneously the infrared radiation carries the characteristic information of the objects, and then converts the temperature distribution image of the target object into a video image by means of photoelectric conversion, electric signal processing and the like.
The uncooled infrared system is not required to be refrigerated and is low in price, so that the uncooled infrared system is widely applied to the civil security field such as electric power, oil fields, roads and the like, and even the military field. Currently, infrared optical systems can be classified into single-view, double-view, multi-view, and continuous zoom systems. The dual-field infrared optical system can realize the quick switching between the narrow field of view and the wide field of view, and the number of the moving lenses is small, and the reliability, the coaxiality and the like can be well ensured, so that the dual-field infrared optical system has irreplaceable application in the military field.
The uncooled infrared optical system has a small relative aperture in order to obtain more light incidence; at the same time, the volume is made large because of the small variety of available materials and the need to use fewer lenses to increase its transmittance. In recent years, some non-refrigeration dual-view-field infrared systems have been designed, for example, an invention patent document No. CN201010516394.8 issued 5/18/2011 discloses a non-refrigeration dual-view-field infrared system, wherein the focal length is switched between 56.7 mm and 114.3 mm, and the length reaches 232 mm, so that the large volume is inconvenient to use or cannot be used in some occasions.
Disclosure of Invention
The invention provides a small-size uncooled dual-field infrared optical system in order to overcome the defects of the technical problems.
The invention discloses a small-size uncooled double-field-of-view infrared optical system, which comprises a first positive meniscus lens for focusing light and a detector for realizing photoelectric signal conversion; it is characterized in that: a biconcave lens, a second positive meniscus lens, a negative meniscus lens and a third positive meniscus lens are sequentially arranged between the first positive meniscus lens and the detector along an optical axis; the first positive meniscus lens, the second positive meniscus lens and the negative meniscus lens are all convex surfaces facing to the object side, and the third positive meniscus lens is a concave surface facing to the object side; the first positive meniscus lens, the second positive meniscus lens and the third positive meniscus lens all have positive diopter, and the biconcave lens and the negative meniscus lens all have negative diopter; the biconcave lens can move between the first positive meniscus lens and the second positive meniscus lens to realize the switching of the narrow field of view and the wide field of view of the optical system.
Positive diopter means converging light and negative diopter means diverging light. Because the convex surfaces of the first positive meniscus lens, the second positive meniscus lens and the negative meniscus lens face the object side, the concave surface of the third positive meniscus lens faces the object side, the first positive meniscus lens, the second positive meniscus lens and the third positive meniscus lens have the convergence effect on light rays, and the biconcave lens and the negative meniscus lens have the divergence effect on light rays, the light path system formed by the double-concave lens and the negative meniscus lens not only has smaller size and larger zoom power, but also has larger zoom range in the switching process of narrow field of view and wide field of view, and is better suitable for switching of far and near scenes.
According to the small-size uncooled double-view-field infrared optical system, the first positive meniscus lens forms a front fixed group, the double-concave lens forms a zoom group, and the second positive meniscus lens, the negative meniscus lens and the third positive meniscus lens form a rear fixed group; the focal lengths of the front fixed group, the zooming group and the rear fixed group satisfy the inequality group:
（1）
wherein,is the focal length of the front fixed group,is the focal length of the variable-magnification group,is the focal length of the rear fixed group,the focal length of the whole optical system is corresponding to the movement of the biconcave lens to the narrow view field.
When the biconcave lens is moved to a narrow field of view, the entire optical system has a maximum focal length; focal length、、Andunder the condition of satisfying inequality (1), can make it have comparatively compact structure.
The invention discloses a small-size uncooled double-view-field infrared optical system, which is characterized in that curved surfaces of a first positive meniscus lens, a biconcave lens, a second positive meniscus lens, a negative meniscus lens and a third positive meniscus lens, which face an object side and a detector, are S1, S2, S3, S4, S5, S6, S7, S8, S9 and S10 respectively, wherein at least one of the 10 curved surfaces is an aspheric surface, and at least one curved surface is provided with a binary diffraction surface.
The aspheric surface has a better curvature radius, can perform better aberration correction and is beneficial to reducing the length of a system so as to obtain the required performance. The use of an aspherical lens brings about excellent sharpness and higher resolution, making it possible to miniaturize the design of the entire optical system.
In the small-size uncooled double-view-field infrared optical system, the curved surface S3 of the biconcave lens and the curved surface S7 of the negative meniscus lens are both aspheric surfaces, and the aspheric surface S7 is also processed with a binary diffraction surface; the parameters of aspheric surface S3 and aspheric surface S7 are as follows:
curved surface S3 -0.46
Curved surface S7 2.654
The aspherical surfaces S3, S7 are determined by the formula (2):
（2）
wherein,the coefficient of the cone being an aspherical surface,、、4, 6, 8-order coefficients for aspheric surfaces;is the height on the aspheric surface in the direction perpendicular to the optical axis,the distance on the aspheric surface from the center of the lens in the horizontal direction;
the binary diffraction surface is determined by equation (3):
（3）
wherein,、2-order and 4-order diffraction coefficients of a binary diffraction surface,in order of the order of diffraction,is the height on the binary diffraction plane in the direction perpendicular to the optical axis,the distance from the binary diffraction surface to the center of the lens in the horizontal direction;taking the number of the particles as 1,=-15.0632，=3.0099。
in the small-size non-refrigeration double-view-field infrared optical system, the curvature radiuses of the curved surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9 and S10 are respectively 160.108mm, 241.287mm, -145.227mm, 162.53mm, 91.041mm, 266.403mm, 85.309mm, 68.023mm, -400.10000mm and-150.61100 mm; distances among the curved surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9 and S10 at the optical axis are 11.3mm, variable distances D1, 3.3mm, variable distances D2, 5.5mm, 13.0723mm, 5.2mm, 22.2525mm and 5.2mm respectively, and the distance between the curved surface S10 and the detector is 22.5151 mm; in the case of a wide field of view, D1=36.3768mm and D2=36.2833, and in the case of switching the infrared optical system to a narrow field of view, D1=64.6800mm and D2=7.9801 mm.
The curvature radius, thickness and arrangement position of the lens adopt the fixed values, so that the length of the whole optical system is 161, the zoom ratio is 3, the focal length under the wide view field condition is 40mm, and the focal length under the narrow view field condition is 120 mm.
According to the small-size uncooled double-field-of-view infrared optical system, the protective glass is arranged in front of the detector, and the diaphragm is arranged at the second positive meniscus lens; the number of F in the optical system is 1.0; the system is suitable for long-wave infrared with the wavelength of 8-12 mu m.
The invention has the beneficial effects that: the double-view-field infrared optical system realizes the conversion between a narrow view field and a wide view field by moving the biconcave lens, can be used for compensating the drift of an image plane along with the temperature, and has a focusing function. This allows the system to have a temperature correction function. Meanwhile, the number of movable lenses is reduced, so that the assembly difficulty is reduced, the precision is easier to ensure, the overall structure is relatively compact, the size of the system in the optical axis direction can be reduced, the complexity of the optical system is also reduced, and the diaphragm is arranged on the lens, so that the lens is easy to process, assemble and debug.
According to the double-view-field infrared optical system, the double-concave lens, the second positive meniscus lens, the negative meniscus lens and the third positive meniscus lens are arranged between the first positive meniscus lens and the detector, the first positive meniscus lens, the second positive meniscus lens and the third positive meniscus lens have a converging effect on light rays, and the double-concave lens and the negative meniscus lens have a diverging effect on the light rays, so that the whole optical system has a smaller size and a larger zoom ratio, has a larger zoom range under the switching condition of a narrow view field and a wide view field, and is suitable for being used on occasions with smaller size requirements on the infrared optical system.
By setting the S3 curved surface of the biconcave lens and the S7 curved surface of the negative meniscus lens to be aspherical surfaces and processing a binary diffraction surface on S7, the aspherical surfaces S3 and S7 have good phase difference correction, excellent sharpness and higher resolution, and the miniaturization design of the entire optical system is possible. The curvature radius of the curved surface of the lens, the thickness of the lens and the distance between the lenses are designed to be specific values, so that the whole optical system has a small size of 161mm, the magnification power of a zoom ratio is 3, and the variable focal lengths in a wide range of 40mm and 120mm under a narrow field of view and a wide field of view respectively, so that the whole uncooled double-field-of-view infrared optical system is suitable for application. Due to the adoption of the binary diffraction surface design, the chromatic aberration can be effectively reduced, zinc selenide can be replaced, the system size is reduced, and the cost can be reduced compared with that of the zinc selenide; the use of an aspherical surface improves image quality and may contribute to a reduction in system size.
Drawings
FIG. 1 is a schematic diagram of a dual field-of-view infrared optical system of the present invention in a narrow field of view;
fig. 2 is a schematic structural diagram of the dual-field infrared optical system of the present invention in a wide field of view.
In the figure: the optical detector comprises a first positive meniscus lens, a second positive meniscus lens, a third positive meniscus lens, a fourth positive meniscus lens, a fifth positive meniscus lens, a sixth.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1 and fig. 2, the structural schematic diagrams of the small-sized uncooled dual-field infrared optical system of the present invention in a narrow field of view and a wide field of view are respectively shown, which includes a first positive meniscus lens 1, a biconcave lens 2, a second positive meniscus lens 3, a negative meniscus lens 4, a third positive meniscus lens 5, and a detector 7, where the optical axes of the 5 lenses are coincident; the first positive meniscus lens 1 is shown to be arranged between an object and a detector 7, and the biconcave lens 2, the second positive meniscus lens 3, the negative meniscus lens 4 and the third positive meniscus lens 5 are arranged between the first positive meniscus lens 1 and the detector 7 in sequence along an optical axis 8. The double concave lens 2 shown is movable between a first positive meniscus lens 1 and a second positive meniscus lens 3 to enable switching between a narrow field of view and a wide field of view.
The first positive meniscus lens 1 is shown with its convex surface facing the object side and having a positive refractive power, i.e. having a converging effect on light; the biconcave lens 2 has negative diopter, namely has a divergent effect on light; the convex surface of the second positive meniscus lens 3 faces the object side, and it has a positive refractive power; the negative meniscus lens 4 has a convex surface facing the object side, and has a negative refractive power; the concave surface of the third positive meniscus lens 5 faces the object side, and it has a positive refractive power. Due to the orientation of the 5 lenses and the positive diopter and the negative diopter of the lenses, the formed optical system not only has smaller size and zoom ratio, but also has larger focal length variation range in the switching process of the narrow field of view and the wide field of view, is suitable for being applied to occasions with smaller requirements on size, and can acquire clear images of far and near scenes. Meanwhile, under the condition that the external temperature changes greatly, defocusing compensation can be realized by moving the biconcave lens, so that phase surface drift caused by the fact that the refractive index of the lens changes along with the temperature is avoided.
The first positive meniscus lens 1 forms a front fixed group, the biconcave lens 2 forms a variable power group, and the second positive meniscus lens 3, the negative meniscus lens 4 and the third positive meniscus lens 5 form a rear fixed group; the focal lengths of the front fixed group, the zooming group and the rear fixed group satisfy the inequality group:
（1）
wherein,is the focal length of the front fixed group,is the focal length of the variable-magnification group,is the focal length of the rear fixed group,the focal length of the whole optical system is corresponding to the movement of the biconcave lens to the narrow view field. When the biconcave lens is moved to a narrow field of view, the entire optical system has a maximum focal length; focal length、、Andunder the condition of satisfying inequality (1), can make it have comparatively compact structure.
The front end of the detector 7 is also provided with a protective glass 6, and the protective glass 6 is used for protecting the detector 7. The diaphragm is arranged at the second positive meniscus lens 3, and the number F of the optical system is 1.0; the system is suitable for long-wave infrared with the wavelength of 8-12 mu m. The detector is 324 multiplied by 256 of pixel number, 38 mu m of pixel size, compatible with 640 multiplied by 512 of high resolution and 17 mu m of pixel size; the thickness of the detector protective glass is 1mm, and the material is Ge; and the distance between the protective glass and the image surface of the detector is 2 mm.
As shown in fig. 2, curved surfaces of the first positive meniscus lens 1, the biconcave lens 2, the second positive meniscus lens 3, the negative meniscus lens 4, and the third positive meniscus lens 5 facing the object side and the detector are S1, S2, S3, S4, S5, S6, S7, S8, S9, and S10, respectively. In order to ensure the imaging effect of the whole optical system while the whole optical system has a smaller size, the curved surface S3 of the biconcave lens 2 and the curved surface S7 of the negative meniscus lens are both aspheric surfaces, and a binary diffraction surface is processed on the aspheric surface S7. The parameters of aspheric surface S3 and aspheric surface S7 are as follows (table 1):
TABLE 1
Curved surface S3 -0.46
Curved surface S7 2.654
The aspherical surfaces S3, S7 are determined by the formula (2):
（2）
wherein,the coefficient of the cone being an aspherical surface,、、4, 6, 8-order coefficients for aspheric surfaces;is the height on the aspheric surface in the direction perpendicular to the optical axis,is the distance in the horizontal direction from the center of the lens on the aspheric surface.
The aspheric surface has a better curvature radius, can perform better aberration correction and is beneficial to reducing the length of a system so as to obtain the required performance. The use of an aspherical lens brings about excellent sharpness and higher resolution, making it possible to miniaturize the design of the entire optical system.
The binary diffraction plane machined on the aspherical surface S7 is determined by equation (4):
（3）
wherein,、2-order and 4-order diffraction coefficients of a binary diffraction surface,in order of the order of diffraction,is the height on the binary diffraction plane in the direction perpendicular to the optical axis,the distance from the binary diffraction surface to the center of the lens in the horizontal direction;taking the number of the particles as 1,=-15.0632，=3.0099。
in a most specific embodiment, the curvature radii of the curved surfaces of the first positive meniscus lens 1, the biconcave lens 2, the second positive meniscus lens 3, the negative meniscus lens 4 and the third positive meniscus lens 5, the distances between adjacent curved surfaces and the light transmission aperture in the optical system of the present invention are shown in table 2;
TABLE 2
From the data in table 2, it can be derived: the curvature radius of S1 is smaller than that of S2, the curvature radius of S3 is smaller than that of S4, the curvature radius of S5 is smaller than that of S6, the curvature radius of S7 is larger than that of S8, and the curvature radius of S9 is larger than that of S10.
When the optical system changes between a wide field of view and a narrow field of view, a distance D1 between the curved surface S3 of the biconcave lens 2 and the curved surface S2 of the first positive meniscus lens 1, and a distance D2 between the curved surface S4 of the biconcave lens 2 and the curved surface S5 of the second positive meniscus lens 3 are shown in table 3:
TABLE 3
From the data in tables 2 and 3, the length of the optical system can be accurately calculated to be 161mm, the zoom ratio to be 3 times, the shortest focal length to be 40mm, and the longest focal length to be 120 mm. It can be seen that the optical system of the present invention has a smaller size, a larger magnification ratio, and a wider focal length variation range.
The small-size uncooled double-view-field infrared optical system realizes the conversion between a narrow view field and a wide view field by moving the double-concave lens, has a relatively compact integral structure, can reduce the size of the system in the direction of an optical axis, and also reduces the complexity of the optical system. Meanwhile, the number of movable lenses is reduced, so that the assembly difficulty is reduced, and the precision is easier to ensure.

Claims (6)

1. A small-size uncooled double-field-of-view infrared optical system comprises a first positive meniscus lens (1) for focusing light and a detector (7) for realizing photoelectric signal conversion; the method is characterized in that: a biconcave lens (2), a second positive meniscus lens (3), a negative meniscus lens (4) and a third positive meniscus lens (5) are sequentially arranged between the first positive meniscus lens and the detector along an optical axis (8); the first positive meniscus lens, the second positive meniscus lens and the negative meniscus lens are all convex surfaces facing to the object side, and the third positive meniscus lens is a concave surface facing to the object side; the first positive meniscus lens, the second positive meniscus lens and the third positive meniscus lens all have positive diopter, and the biconcave lens and the negative meniscus lens all have negative diopter; the biconcave lens can move between the first positive meniscus lens and the second positive meniscus lens to realize the switching of the narrow field of view and the wide field of view of the optical system.
2. The small-size uncooled dual-field infrared optical system of claim 1, wherein: the first positive meniscus lens (1) forms a front fixed group, the double concave lens (2) forms a zoom group, and the second positive meniscus lens (3), the negative meniscus lens (4) and the third positive meniscus lens (5) form a rear fixed group; the focal lengths of the front fixed group, the zooming group and the rear fixed group satisfy an inequality group (1):
f 1 f t > 0.85 f 2 f t < - 0.25 0.10 < f 3 f t < 0.35 - - - ( 1 )
wherein f is1Focal length of front fixed group, f2Focal length of variable focal length group, f3Is the focal length of the rear fixed group, ftThe focal length of the whole optical system is corresponding to the movement of the biconcave lens to the narrow view field.
3. The small-size uncooled dual-field infrared optical system of claim 1 or 2, wherein: the curved surfaces of the first positive meniscus lens (1), the biconcave lens (2), the second positive meniscus lens (3), the negative meniscus lens (4) and the third positive meniscus lens (5) facing the object side and the detector are respectively S1, S2, S3, S4, S5, S6, S7, S8, S9 and S10, at least one of the 10 curved surfaces is an aspheric surface, and at least one curved surface is provided with a binary diffraction surface.
4. The small-size uncooled dual-field infrared optical system of claim 3, wherein: the curved surface S3 of the biconcave lens and the curved surface S7 of the negative meniscus lens are both aspheric surfaces, and the aspheric surface S7 is also processed with a binary diffraction surface; the parameters of aspheric surface S3 and aspheric surface S7 are as follows:
k α4 α6 α8 curved surface S3 -0.46 1.43×10-7 5.78×10-11 9.88×10-14 Curved surface S7 2.654 -1.67×10-7 -1.56×10-11 -9.77×10-14
The aspherical surfaces S3, S7 are determined by the formula (2):
z = cr 2 1 + 1 - ( 1 + k ) c 2 r 2 + &alpha; 4 r 4 + &alpha; 6 r 6 + &alpha; 8 r 8 - - - ( 2 )
where k is the conic coefficient of the aspheric surface, α4、α6、α84, 6, 8-order coefficients for aspheric surfaces; r is the height of the aspheric surface from the optical axis in the vertical direction, and z is the distance of the aspheric surface from the lens center in the horizontal direction;
the binary diffraction surface is determined by equation (3):
c＝M(A1R2+A2R4) (3)
wherein A is1、A2The diffraction coefficients of 2-order diffraction and 4-order diffraction of the binary diffraction surface are provided, M is the diffraction order, R is the height of the binary diffraction surface from the optical axis in the vertical direction, and c is the distance of the binary diffraction surface from the center of the lens in the horizontal direction; m is 1, A1＝-15.0632，A2＝3.0099。
5. The small-size uncooled dual-field infrared optical system of claim 4, wherein: the curvature radiuses of the curved surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9 and S10 are 160.108mm, 241.287mm, -145.227mm, 162.53mm, 91.041mm, 266.403mm, 85.309mm, 68.023mm, -400.10000mm and-150.61100 mm respectively; distances among the curved surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9 and S10 at the optical axis are 11.3mm, variable distances D1, 3.3mm, variable distances D2, 5.5mm, 13.0723mm, 5.2mm, 22.2525mm and 5.2mm respectively, and the distance between the curved surface S10 and the detector (7) is 22.5151 mm; in the case of the infrared optical system with a wide field of view, D1-36.3768 mm and D2-36.2833 mm, and in the case of the infrared optical system switched to a narrow field of view, D1-64.6800 mm and D2-7.9801 mm.
6. The small-size uncooled dual-field infrared optical system of claim 1 or 2, wherein: the diaphragm is arranged at the second positive meniscus lens; the number of F in the optical system is 1.0; the system is suitable for long-wave infrared with the wavelength of 8-12 mu m.
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CN108152935B (en) * 2018-01-12 2020-09-01 中国科学院长春光学精密机械与物理研究所 Long-wave infrared imaging optical system
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