CN218601569U - Light-weight small-sized long-wave uncooled continuous zooming optical system and infrared lens - Google Patents
Light-weight small-sized long-wave uncooled continuous zooming optical system and infrared lens Download PDFInfo
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- CN218601569U CN218601569U CN202222778456.3U CN202222778456U CN218601569U CN 218601569 U CN218601569 U CN 218601569U CN 202222778456 U CN202222778456 U CN 202222778456U CN 218601569 U CN218601569 U CN 218601569U
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Abstract
The application discloses non-refrigeration continuous zoom optical system of light weight miniaturization wavelength and infrared camera lens includes: the focusing lens is provided with a first incident surface; the focusing lens is used for focusing an object; the zoom lens group and the focusing lens are arranged on the same optical axis, and the zoom lens group is positioned on one side of the focusing lens far away from the first incident surface; the zoom lens group comprises a zoom lens and a zoom compensation lens which are sequentially arranged along the direction far away from the focusing lens, and the interval between the two lenses is adjusted to change the focal length; the fixed lens group and the zoom lens group are arranged on the same optical axis, the fixed lens group is positioned on one side of the zoom lens group far away from the focusing lens, and the fixed lens group is used for compensating aberration caused by focal length change under a preset temperature range. According to the system, zooming and zooming compensation operations are completed through the zooming lens group, and meanwhile, the image surface stability of the system in a preset temperature range can be guaranteed through the fixing lens group, and clear imaging can be achieved.
Description
Technical Field
The present disclosure relates generally to the field of optics, and more particularly to a lightweight and compact long-wavelength uncooled continuous zoom optical system and an infrared lens.
Background
The infrared imaging system receives the radiation energy of a target and a background, enters a focal plane of a detector, and then realizes the detection and tracking of the target through the processing of images. Compared with the traditional visible light system, radar and the like, the system has the advantages of high orientation precision, high sensitivity, strong anti-interference capability, capability of identifying hidden targets and the like, and is widely applied in the fields of aerospace, edge sea defense and the like.
At present, a continuous zooming infrared system in the prior art needs a plurality of layers of lenses, so that the continuous zooming infrared system has the problems of large volume, high cost, low resolving power and the like due to the influence of a temperature environment, and therefore, a light-weight and small-size long-wavelength uncooled continuous zooming optical system and an infrared lens are provided.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a light-weight and small-sized long wavelength uncooled continuous zoom optical system and an infrared lens that are small in size, low in cost, and adaptable to different temperature environments.
In a first aspect, the present application provides a lightweight and compact long-wavelength uncooled continuous zoom optical system including:
a focusing lens having a first incident surface; the focusing lens is used for focusing an object;
the zoom lens group and the focusing lens are arranged on the same optical axis, and the zoom lens group is positioned on one side of the focusing lens close to the first incident surface; the zoom lens group comprises a zoom lens and a zoom compensation lens which are sequentially arranged along the direction far away from the focusing lens, and the interval between the two lenses is adjusted to change the focal length;
the fixed lens group and the zoom lens group are arranged on the same optical axis, and the fixed lens group is positioned on one side of the zoom lens group away from the focusing lens; the fixed mirror group is used for compensating aberration caused by focal length change in a preset temperature range.
According to the technical scheme provided by the embodiment of the application, the fixed mirror group comprises:
the first fixed mirror is arranged on one side, away from the zoom mirror, of the zoom compensation mirror;
the second fixed mirror is arranged on one side, away from the zoom compensation mirror, of the first fixed mirror;
the third fixed mirror is arranged on one side, away from the first fixed mirror, of the second fixed mirror.
According to the technical scheme provided by the embodiment of the application, the first focusing lens is a crescent positive lens with a convex surface facing the direction away from the zoom lens; the zoom lens is a biconcave negative lens; the zoom compensation lens is a biconvex positive lens; the first fixed mirror is a crescent lens with a concave surface facing the direction close to the zoom compensation mirror; the second fixed mirror is a crescent lens with a convex surface facing to the direction far away from the first fixed mirror; the third fixed mirror is a biconvex lens.
According to the technical scheme provided by the embodiment of the application, the focal length of an optical system consisting of the focusing lens, the zoom lens group and the fixed lens group is 20-140 mm; the F number is 0.8-1.2.
According to the technical scheme provided by the embodiment of the application, the concave surface of the zoom lens close to the focusing lens is an aspheric surface; the convex surface of the zoom compensation lens close to the zoom lens is an aspheric surface and a diffraction surface; the concave surface of the first fixed mirror close to the zoom compensation mirror is an aspheric surface; and the convex surface of the third fixed mirror, which is close to the second fixed mirror, is an aspheric surface.
According to the technical scheme provided by the embodiment of the application, the aspheric surface meets the following formula:
wherein z represents the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; r is expressed as height; c is expressed as the vertex curvature of the surface; k is expressed as conic curvature; a is a 1 、a 2 、a 3 、a 4 、a 5 And a 6 Expressed as high-order aspheric coefficients.
According to the technical scheme provided by the embodiment of the application, the diffraction surface meets the following formula:
Φ＝A 1 ρ 2 +A 2 ρ 4 (2)
ρ＝r/r n (3)
wherein Φ is a phase of the diffraction plane; r is n The programmed radius expressed as a diffraction plane; a. The 1 And A 2 Expressed as the phase coefficient of the diffraction plane.
In a second aspect, the present application provides an infrared lens including the above-described lightweight and compact long-wavelength uncooled continuous zoom optical system.
To sum up, the present disclosure specifically discloses a light-weight and small-size long-wavelength uncooled continuous zoom optical system, including: a focusing lens, a zoom lens group and a fixed lens group; the focusing lens is provided with a first incident surface and can focus an object space; the zoom lens group and the focusing lens are arranged on the same optical axis, and the zoom lens group is positioned on one side of the focusing lens far away from the first incident surface; the zoom lens group comprises a zoom lens and a zoom compensation lens which are sequentially arranged along the direction far away from the focusing lens, and the interval between the two lenses is adjusted to change the focal length; the fixed lens group and the zoom lens group are arranged on the same optical axis, the fixed lens group is positioned on one side of the zoom lens group far away from the focusing lens, and the fixed lens group can compensate aberration caused by focal length change under a preset temperature range.
According to the zoom lens, an object space is focused through the focusing lens, continuous zooming operation can be realized through adjusting the interval between the zoom lens and the zoom compensation lens in the zoom lens group, and the whole continuous zooming system is small and exquisite in structure and low in cost; in addition, the optical imaging system is also provided with a fixed lens group which can compensate aberration in a preset temperature range and ensure high-definition imaging at-40 ℃ to +60 ℃ in a full focus range.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic structural diagram of an infrared lens including the above-mentioned light-weight miniaturized long-wavelength uncooled continuous zoom optical system in a short-focus position.
Fig. 2 is a schematic structural diagram of an infrared lens including the above-mentioned light-weight miniaturized long-wavelength uncooled continuous zoom optical system in a middle focus position.
Fig. 3 is a schematic structural diagram of an infrared lens including the above-described light-weight and small-sized long-wavelength uncooled continuous zoom optical system in a telephoto position.
Fig. 4 shows the short-focus MTF test result of an infrared lens including the above-mentioned light-weight miniaturized long-wavelength uncooled continuous zoom optical system.
Fig. 5 shows the MTF test result of the intermediate focus of the infrared lens including the above-mentioned light-weight miniaturized long-wavelength uncooled continuous zoom optical system.
Fig. 6 shows the results of the telephoto MTF test for an infrared lens including the above-mentioned light-weight miniaturized long-wavelength uncooled continuous zoom optical system.
Fig. 7 shows the short-focus distortion test result of an infrared lens including the above-mentioned light-weight miniaturized long-wavelength uncooled continuous zoom optical system.
Fig. 8 shows the result of the focal distortion test in the infrared lens including the above-mentioned light-weight miniaturized long-wavelength uncooled continuous zoom optical system.
Fig. 9 shows a long-focus distortion test result of an infrared lens including the above-mentioned light-weight miniaturized long-wavelength uncooled continuous zoom optical system.
Reference numbers in the figures: l1, a focusing lens; l2, a zoom lens; l3, a zoom compensation lens; l4, a first fixed mirror; l5, a second fixed mirror; l6, a third fixed mirror; s1, a first incidence surface; s2, a first emergent surface; s3, a second incidence surface; s4, a second emergent surface; s5, a third incidence surface; s6, a third emergent surface; s7, a fourth incidence surface; s8, a fourth emergent surface; s9, a fifth incidence surface; s10, a fifth emergent surface; s11, a sixth incidence surface; s12, a sixth emergent surface; 100. an object space; 101. a machine core window; 102. and (5) target surface.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
Referring to fig. 1, an infrared lens including the first embodiment of the light-weight and small-sized long wavelength uncooled continuous zoom optical system includes:
a focusing lens L1, the focusing lens L1 having a first concave surface; the focusing lens L1 is used for focusing an object;
the zoom lens group and the focusing lens L1 are arranged on the same optical axis, and the zoom lens group is positioned on one side of the focusing lens L1 close to the first concave surface; the zoom lens group comprises a zoom lens L2 and a zoom compensation lens L3 which are sequentially arranged along the direction far away from the focusing lens L1, and the interval between the two lenses is adjusted to change the focal length;
the fixed lens group and the zoom lens group are arranged on the same optical axis, and the fixed lens group is positioned on one side of the zoom lens group far away from the focusing lens L1; the fixed lens group can compensate aberration caused by focal length change in a preset temperature range.
In this embodiment, in the object space 100, the focusing lens L1 is a lens with a fixed position, and the external shape of the focusing lens L1 is a positive meniscus lens with a convex surface facing the object space, and the focusing lens L1 is used for focusing on object spaces with different distances;
the zoom lens group and the focusing lens L1 are arranged on the same optical axis, and the zoom lens group comprises a zoom lens L2 and a zoom compensation lens L3; since the optical system changes the optical spacing to realize the position of the system focus and further changes the focal length, as shown in fig. 1, fig. 2 and fig. 3, the focal length of the system can be adjusted by adjusting the spacing between two zoom lenses, wherein the zoom lens L2 is a biconcave negative lens for realizing continuous zoom, and the zoom compensation lens L3 is a biconvex positive lens for realizing continuous zoom compensation, mainly for correcting the image plane offset caused by zooming;
furthermore, when the zoom lens is adjusted from the short-focus position to the middle-focus position and the long-focus position, the zoom lens L2 is gradually moved towards the direction close to the zoom compensation lens L3;
because the change of the object-image conjugate distance of the zoom lens group generates image surface displacement continuously in the zooming process, the fixed lens group and the zoom lens group are arranged in the same optical axis, and the fixed lens group can match the image surface displacement of the zoom lens group with the object surface displacement thereof, thereby ensuring the stability of the image surface position of the system and being used for compensating the image surface offset caused by the focal distance change in the preset temperature range; the fixed lens group is a lens with a fixed position; in addition, a moving structure can be added after the lens group is fixed, and an infrared movement is fixed on the moving structure, for example, as shown in fig. 1 and fig. 4 to 9, a movement window 101 and a target surface 102 are arranged on one side of the third fixed mirror L6 far away from the second fixed mirror L5, and under the condition that the lens of the fixed group does not need to move, clear imaging in the preset temperature range of-40 ℃ to +60 ℃ can be realized only by slight adjustment of the movement; the target surface 102 is a photoreceptor structure surface that receives an imaging beam.
Specifically, a first fixed mirror L4, the first fixed mirror L4 being disposed on a side of the zoom compensation mirror L3 away from the zoom mirror L2; the first fixed mirror L4 is a meniscus lens with a concave surface facing the object space, and is used for realizing aberration balance of the system;
the second fixed mirror L5 is arranged on one side, away from the zoom compensation mirror, of the first fixed mirror L4; the second fixed mirror L5 is a meniscus lens L5 with the concave surface facing the object space;
the third fixed mirror L6 is arranged on one side, far away from the first fixed mirror, of the second fixed mirror L5; the third fixed mirror L6 is a biconvex lens, and the third fixed mirror L6 and the second fixed mirror L5 are immovable lenses, which can compensate aberration at high and low temperatures.
Specifically, the first focusing lens L1 is a crescent positive lens with a convex surface facing away from the zoom lens L2, and the zoom lens L2 is a biconcave negative lens; the zoom compensation lens L3 is a biconvex positive lens, the first fixed lens L4 is a crescent lens with a concave surface facing the direction close to the zoom compensation lens L3, the second fixed lens L5 is a crescent lens with a convex surface facing the direction far away from the first fixed lens L4, and the third fixed lens L6 is a biconvex lens.
Further, the concave surface of the zoom lens L3 near the focus lens L1 is an aspherical surface, that is, the second incident surface S3 is an aspherical surface; the convex surface of the zoom compensation lens L3 close to the zoom lens L2 is an aspheric surface and a diffraction surface, that is, the third incident surface S5 is an aspheric surface and a diffraction surface; the concave surface of the first fixed mirror L4 close to the zoom compensation mirror L3 is an aspheric surface, that is, the fourth incident surface S7 is an aspheric surface; the convex surface of the third fixed mirror L6 close to the second fixed mirror L5 is an aspheric surface, that is, the fifth exit surface S10 is an aspheric surface;
the focal length of an optical system consisting of the focusing lens L1, the zoom lens group and the fixed lens group is 20 mm-140 mm; f number is 0.8-1.2, and can be adapted to 640 x 512 (12 um) movement; the specific parameters are shown in table 1:
TABLE 1 lens optical parameters
Wherein, the non-expression is an aspheric surface, the remark is that the vacancy is an spherical surface, and the non-diffraction is an aspheric surface and a diffraction surface; specifically, the first incident surface S1, the first emission surface S2, the second emission surface S4, the third emission surface S6, the fourth emission surface S8, the fifth incident surface S9, the sixth incident surface S11, and the sixth incident surface S12 are all spherical surfaces.
Specifically, the aspherical surface satisfies the following formula:
wherein z represents the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; r is expressed as height; c is expressed as the vertex curvature of the surface; k is expressed as conic curvature; a is 1 、a 2 、a 3 、a 4 、a 5 And a 6 Expressed as high-order aspheric coefficients.
For the second entrance face S3, C = -0.0036347020433533; k =0; a is a 1 ＝0；a 2 ＝1.76963E-7；a 3 ＝9.85278E-11；a 4 ＝-2.73434E-13；a 5 ＝2.17238E-16；a 6 ＝-1.82945E-19；
For the third entrance face S5, C =0.0032425891523695; k =0; a is 1 ＝0；a 2 ＝-1.0199E-7；a 3 ＝-3.57779E-11；a 4 ＝5.73667E-14；a 5 ＝-3.38632E-17；a 6 ＝1.71747E-20；
For the fourth entrance face S7, C = -0.016140554909453; k =0; a1 a is 1 ＝0；a 2 ＝3.62963E-7；a 3 ＝3.64704E-10；a 4 ＝-6.37647E-13；a 5 ＝8.05631E-16；a 6 ＝-3.37592E-19；
For the fifth exit face S10, C =0.0033167495854063; k =0; a is a 1 ＝0；a 2 ＝5.26481E-7；a 3 ＝1.54848E-10；a 4 ＝-6.6481E-13；a 5 ＝6.2841E-16；a 6 ＝-3.494522E-19；
Specifically, the diffraction surface satisfies the following formula:
Φ＝A 1 ρ 2 +A 2 ρ 4 (2)
ρ＝r/r n (3)
wherein Φ is a phase of the diffraction plane; r is n The programmed radius expressed as a diffraction plane; a. The 1 And A 2 A phase coefficient expressed as a diffraction plane;
for the third incident surface S5, r n ＝26；A 1 ＝-10.1916；A 2 ＝-0.1332。
Example 2
An infrared lens comprising the non-refrigeration continuous zooming optical system with light weight and small size in embodiment 1, wherein the infrared lens can observe a target distance object in a preset temperature range and ensure clear imaging, as shown in fig. 4 to 9, according to the MTF test and distortion angle measurement result display of a short focus, a middle focus and a long focus, the infrared lens can meet the requirements of continuous zooming and clear imaging under the conditions of-40 ℃ to +60 ℃.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A lightweight and compact long-wavelength uncooled continuous zoom optical system, comprising:
a focusing lens (L1), the focusing lens (L1) having a first incident surface (S1); the focusing lens (L1) is used for focusing an object;
the zoom lens group and the focusing lens (L1) are arranged on the same optical axis, and the zoom lens group is positioned on one side, far away from the first incident surface (S1), of the focusing lens (L1); the zoom lens group comprises a zoom lens (L2) and a zoom compensation lens (L3) which are sequentially arranged along the direction far away from the focusing lens (L1), and the interval between the two lenses is adjusted to change the focal length;
the fixed lens group and the zoom lens group are arranged on the same optical axis, and the fixed lens group is positioned on one side of the zoom lens group, which is far away from a focusing lens (L1); the fixed mirror group can compensate aberration caused by focal length change in a preset temperature range.
2. A lightweight miniaturized wavelength uncooled continuous zoom optical system as recited in claim 1, wherein the fixed mirror group includes:
the first fixed mirror (L4), the first fixed mirror (L4) is arranged on one side of the zoom compensation mirror (L3) far away from the zoom mirror (L2);
the second fixed mirror (L5), the second fixed mirror (L5) is arranged on one side of the first fixed mirror (L4) far away from the zooming compensation mirror (L3);
a third fixed mirror (L6), the third fixed mirror (L6) set up in the second fixed mirror (L5) keeps away from one side of first fixed mirror (L4).
3. A lightweight and compact long wavelength uncooled continuous zoom optical system according to claim 2, wherein the focusing lens (L1) is a crescent positive lens with its convex surface facing away from the zoom lens (L2); the zoom lens (L2) is a biconcave negative lens; the zoom compensation lens (L3) is a biconvex positive lens; the first fixed mirror (L4) is a crescent lens with a concave surface facing to the direction close to the zooming compensation mirror (L3); the second fixed mirror (L5) is a crescent lens with a convex surface facing to the direction far away from the first fixed mirror (L4); the third fixed mirror (L6) is a biconvex lens.
4. A lightweight, compact, long wavelength uncooled continuous zoom optical system as defined in claim 1, wherein the focal length of the optical system consisting of the focusing lens (L1), the zoom lens group and the fixed lens group is 20 mm-140 mm; the F number is 0.8-1.2.
5. A lightweight and compact long wavelength uncooled continuous zoom optical system according to claim 3, wherein the concave surface of the zoom lens (L2) near the focusing lens (L1) is aspheric; the convex surface of the zoom compensation lens (L3) close to the zoom lens (L2) is an aspheric surface and a diffraction surface; the concave surface of the first fixed mirror (L4) close to the zoom compensation mirror (L3) is an aspheric surface; and the convex surface of the third fixed mirror (L6) close to the second fixed mirror (L5) is an aspheric surface.
6. A lightweight and compact long wavelength uncooled zoom optical system according to claim 5, wherein the aspheric surface satisfies the following formula:
wherein z represents the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; r is represented as height; c is expressed as the vertex curvature of the surface; k is expressed as conic curvature; a is 1 、a 2 、a 3 、a 4 、a 5 And a 6 Expressed as high-order aspheric coefficients.
7. A lightweight, compact, long wavelength uncooled zoom optical system as recited in claim 5, wherein the diffraction surface satisfies the following equation:
Φ＝A 1 ρ 2 +A 2 ρ 4 (2)
ρ＝r/r n (3)
wherein Φ is a phase of the diffraction plane; r is n The programmed radius expressed as a diffraction plane; a. The 1 And A 2 Expressed as the phase coefficient of the diffraction plane.
8. An infrared lens comprising the non-refrigerated continuous zoom optical system of any one of claims 1 to 7, which is lightweight and compact.
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| CN202222778456.3U CN218601569U (en) | 2022-10-21 | 2022-10-21 | Light-weight small-sized long-wave uncooled continuous zooming optical system and infrared lens |
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Address after: 065200 l03-g workshop in Baishi Jingu Yanjiao international industrial base, west of Yingbin North Road and north of Gushan West Road, Yanjiao Development Zone, Sanhe City, Langfang City, Hebei Province Patentee after: Hebei Lansitek Optoelectronic Technology Co.,Ltd. Address before: 065200 l03-g workshop in Baishi Jingu Yanjiao international industrial base, west of Yingbin North Road and north of Gushan West Road, Yanjiao Development Zone, Sanhe City, Langfang City, Hebei Province Patentee before: SANHE LENSTEC PHOTOELECTRIC TECHNOLOGY CO.,LTD. |
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