CN112684598B - Uncooled long-wave infrared continuous zooming optical system - Google Patents
Uncooled long-wave infrared continuous zooming optical system Download PDFInfo
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Abstract
The invention belongs to the field of continuous zooming optical systems, and particularly discloses an uncooled long-wavelength infrared continuous zooming optical system, which is characterized in that a front fixed lens group, a zoom lens group, a compensation lens group, an aberration stabilizing lens group, a rear fixed lens group and an optical filter are sequentially arranged along an optical axis from an object plane to a focal plane, the zoom lens group, the compensation lens group and the aberration stabilizing lens group linearly move back and forth along the optical axis direction to realize continuous zooming, and the rear fixed lens group moves back and forth along the optical axis direction to realize defocusing compensation, wherein the optical system adopts a mechanical compensation zooming mode, a zooming core is composed of the zoom lens group, the compensation lens group and the aberration stabilizing lens group, is of a three-action group structure, can realize the continuous zooming function of which the focal length ratio is not less than 1, the zoom ratio is not less than 6 and the relative aperture is not more than 1.2, in the process of continuously changing the focal length, all focal length central view fields and all focal length edge view fields have better imaging quality.
Description
Technical Field
The present invention is in the field of continuous zoom optical systems. The invention particularly relates to a compact uncooled long-wave infrared continuous zooming optical system which has a long-wave infrared band and a large relative aperture and can realize a continuous zooming function.
Background
With the cost reduction of the uncooled long-wave infrared focal plane detector, thermal infrared imager products with optical zooming function are widely applied, and the thermal infrared imager products need to have the optical zooming function as an optical system of the thermal imager core.
In the prior art, a long-wave infrared zooming optical system mainly has two implementation modes based on mechanical compensation and optical compensation, the optical compensation continuous zooming system realizes continuous field-of-view conversion by moving two or more lens groups at the same speed, in the zooming process, all components of the zooming group are fixedly connected together by a lens frame and do constant-speed motion along an optical axis, other components are always kept still, a zooming core is only a single motion component, and the large zooming ratio and the miniaturization of the whole optical system are difficult to realize.
The mechanical compensation zooming form can be divided into two-component, three-component and multi-component linkage zooming forms, and the like, and has the common characteristics that: in order to ensure the image plane to be stable in the zooming process, the nonlinear movement of each moving group can be realized by specially designing a corresponding cam guide rail or other driving mechanisms. Because various driving mechanisms can be introduced, the mechanical compensation zooming mode allows a plurality of moving components to synchronously move according to different rules, the degree of freedom is greatly increased, and the optical system can be greatly magnified or miniaturized through reasonable arrangement, so that the optical system is widely applied in recent years.
In addition, compared with a refrigeration type detector with high price, the uncooled long-wave infrared detector has lower sensitivity, and the large relative aperture of an optical system is also required to improve the sensitivity of the whole thermal image system. However, as the relative aperture increases, the aberration (i.e., spherical aberration) of the point on the axis increases, so that it is difficult to correct it, and the structural form will be complicated accordingly; the larger the field of view, the greater the off-axis primary and high order aberrations, and the greater the proportion of high order aberrations in the aberrations, making balancing the aberrations difficult.
Most of uncooled long-wave infrared continuous zooming optical systems disclosed by some existing literature documents are in a two-moving-set mechanical compensation zooming mode, and have the problems of small relative aperture, large volume envelope, large number of lenses and the like, and the focal length ratio is less than 0.9 (the focal length ratio is the ratio of the focal length of the optical system to the total length of the optical system), so that the compact uncooled long-wave infrared zooming optical system with the large relative aperture is designed, the requirements of light, small, low in cost and high in reliability on infrared zooming imaging detection are met, and the difficulty is high.
Chinese patent CN 209167666U, CN 209182571U, CN 210572982U, CN 2017216127U, CN 201620943182U, CN 206039018U, CN 205539681U, CN 205427294U, CN 205263390U, CN 203965714U, CN 203241607U, CN 110412756A, CN 106932891A, CN 106125276B, CN 103901592B, CN 103852874A, CN 202204981U, CN 107976791a and the like disclose uncooled long-wave infrared continuous zooming optical systems with multiple focal length ranges and multiple relative apertures, which are adapted to multiple detector specifications, all adopt two-moving-group optical structures, and are typical negative-group zooming positive-group compensation structures, and it is difficult to realize a large focal length ratio while maintaining a large relative aperture. The zoom ratio in CN 205539681U is 7, the device is adapted to a 640 multiplied by 48025 mu m detector, the focal length range is 25 mm-225 mm, the optical total length is 251mm, the focal length ratio is about 0.9, but the F number is 1.5, and a larger focal length ratio cannot be realized under the same F number; the F numbers of other patents are all concentrated on about 1.2, and the focal length ratio is less than 0.8. The design of 20-time uncooled long-wave infrared continuous zooming optical system, which is published in China journal, volume 38, No. 5, discloses a detector with the same structure, the focal length range of 15 mm-300 mm, the F number of 1.3, the adaptation of 384 multiplied by 28825 mu m, the total optical length of 330mm, the focal length ratio of 0.91 and the incapability of adapting to larger area array. In addition, the title of the infrared zoom optical system is 20x long-wave infrared zoom optical system design, and the F number is 2, which is published in the journal of China, infrared technology, volume 35, and phase 10, which are difficult to satisfy practical application.
Chinese patent CN 106932891A, CN 101620312B, CN 101482647A, CN 101282428A, united states patent US 6091551, and published in the journal of china "optical science, journal of china, volume 29, 2, entitled" 8-fold non-refrigeration infrared refraction/diffraction continuous zoom system design ", etc., disclose various negative group zoom negative group compensation type two-action optical structures, the maximum zoom ratio of the document is 8, the focal length range is 12 mm-144 mm, the total length of the optical system is 170mm, the F number is 1.3, and the focal length ratio is about 0.85; the F numbers of other patents are concentrated on about 1.2, and the coke length ratio is less than 0.8. On the other hand, the document entitled "10 times global infrared zoom optical system design" published in "applied optics" volume 37, 3 rd of the Chinese journal, and the F number is 2.5, which is also difficult to satisfy practical applications.
Chinese patent CN 201852990U, CN 1019550067B, CN 101950067a, japanese patent laid-open/2011-open/186070, laid-open/2009-open/192886, disclose various negative-group zoom-positive-group compensation optical structures having an intermediate fixed lens group, wherein the number of the optical structures F is concentrated on about 1.2, and the focal length ratio is less than 0.75.
In addition, chinese patent CN 206710691U also discloses an optically compensated uncooled long-wavelength infrared continuous zoom optical system. The focal length range is 13 mm-42 mm, the pixel number is 640 multiplied by 480, the pixel size is 17 mu m, the number of adopted light turns F #1.0, the total length of an optical system is 143mm, and the focal length ratio is 0.29.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an optical system which has a large focal length ratio, a small volume and a compact structure, can realize a zooming function and has a large relative aperture, in particular to an optical system of a long-wave infrared band.
In order to achieve the purpose, the invention provides the following technical scheme:
a compact uncooled long-wavelength infrared continuous zooming optical system comprises a front fixed lens group, a zoom lens group, a compensation lens group, an aberration stabilizing lens group, a rear fixed lens group and an optical filter which are sequentially arranged from an object plane to a focal plane along an optical axis, and is characterized in that the zoom lens group, the compensation lens group and the aberration stabilizing lens group linearly move back and forth along the optical axis according to a set rule to realize continuous zooming, and the rear fixed lens group moves back and forth along the optical axis to realize defocusing compensation; the front fixed lens group has positive focal power; the zoom lens group has negative focal power; the compensating lens group has positive focal power, and the aberration stabilizing lens group has negative focal power; the rear fixed lens group has positive focal power
Preferably, one side of the compensation lens group close to the object plane is fixedly connected with a diaphragm, and the optical filter is a band-pass optical filter.
The preferable conditions of each lens group in the optical system are as follows:
1. front fixed lens group
The front fixed lens group has positive focal power and is a single-chip meniscus positive lens structure. When the focal length of the front fixed mirror group 7 is f7 and the focal length of the telephoto end of the compact uncooled long-wavelength red continuous zooming optical system is fL, fL and f7 satisfy the following conditional expressions:
0.8 < |fL/f7| < 2.3 (1)
the conditional expression (1) is an expression for limiting the focal length range of the front fixed lens group. By satisfying the conditional expression (1), the field curvature and distortion introduced by the front fixed lens group can be corrected well in the whole working spectrum in the full zoom range, and the miniaturization of the optical system is ensured. In addition, in the conditional expression (1), if the upper limit is exceeded, it is advantageous to increase the field of view of the optical system, but large curvature of field and distortion are introduced in the short focal length, which complicates the optical system. On the other hand, if the lower limit is exceeded, the focal length of the front fixed lens group becomes long, and miniaturization of the optical system becomes difficult.
In this way, the front fixed mirror group having a long focal length and positive refractive power (positive refractive power) can be disposed on the side of the optical system closest to the object side, which is advantageous for downsizing the optical system.
Zoom lens group
The zoom lens group has negative focal power and is a single-chip negative lens structure. If the magnification of the zoom lens group at the telephoto position is m6, m6 satisfies the following conditional expression:
0.9 < |m6| < 1.5 (2)
the conditional expression (2) is an expression for limiting the magnification range of the variable power lens group. By satisfying the conditional expression (2), the optical system can be miniaturized while ensuring rapid zooming. If the lower limit of conditional expression (2) is exceeded, the amount of movement of the variable power lens group increases, making it difficult to downsize the optical system. On the other hand, if the upper limit of the conditional expression (2) is exceeded, it is advantageous to miniaturize the optical system, but it becomes difficult to correct coma aberration and astigmatism particularly at the short focal end, and there is a problem that the optical performance deteriorates.
Therefore, the zoom lens group can compress the aperture of the rear group, effectively compress the incident angle of light on the surface of the rear group lens, reduce the difficulty of aberration correction of the rear group lens, well correct the aberration caused by large aperture, ensure rapid zooming of an optical system and better correct the chromatic aberration generated by light in the whole working spectrum range spanning the full zoom area.
Compensating lens group
The compensating lens group has positive focal power and is a single-chip positive lens structure. If the magnification of the compensation mirror set at the telephoto position is m5, m5 satisfies the following conditional expression:
0.7 < |m5| < 1.2 (3)
the conditional expression (3) is an expression for defining the magnification range of the compensating mirror group. By satisfying the conditional expression (3), the outer diameter of the compensating lens group can be compressed, the zooming stroke of the compensating lens group can be effectively shortened, and the smooth and rapid movement of the lens group is ensured. If conditional expression (3) is less than the lower limit thereof, the outer diameter of the compensating lens group becomes large, and it becomes difficult to miniaturize the optical system. On the other hand, if the upper limit of the conditional expression (3) is exceeded, it is advantageous to miniaturize the optical system, but excessive distortion is introduced, and distortion occurs in an image formed by the optical system.
Aberration stabilizing lens assembly
The aberration stabilizing lens group has negative focal power and is a single-chip negative lens structure. Assuming that the focal length of the aberration stabilizing lens assembly 4 is f4, fL and f4 satisfy the following conditional expressions:
1.5 < |fL/f4| < 2.7 (4)
the conditional expression (4) is an expression for defining the focal length range of the aberration stabilizing lens group associated with the variable power lens group and the compensating lens group. By satisfying the conditional expression (4), the slow and rapid movement of the optical system compensation lens group can be ensured, and the field curvature in the telephoto end can be better corrected. If the lower limit of the conditional expression (4) is exceeded, the amount of movement of the compensating lens group increases, making it difficult to miniaturize the optical system. On the other hand, if the value is higher than the upper limit of the conditional expression (4), the correction of curvature of field at the telephoto end becomes difficult, and the optical performance deteriorates, which is problematic.
Therefore, the compensation lens group can partially compensate the field curvature and distortion introduced by the zoom lens group and the compensation lens group.
Rear fixed lens group
The rear fixed lens group has positive focal power and is of a single-piece type or double-separation type lens structure. If the focal length of the rear fixed mirror group is f3, fL and f3 satisfy the following conditional expressions:
3.8 < |fL/f3| < 5.6 (5)
the conditional expression (5) is an expression for defining the power range of the rear fixed lens group of the continuous zoom optical system according to the embodiment. By satisfying the conditional expression (5), it is possible to maintain a short focusing stroke of the focusing member and to ensure the adaptability of the optical system under different use conditions. If the upper limit of the conditional expression (5) is exceeded, the focus stroke increases, and therefore the focus compensation time of the optical system increases. On the other hand, if the lower limit of the conditional expression (5) is exceeded, the focal power of the rear fixed mirror group becomes large, which is advantageous for reducing the stroke of the focus adjusting element, but it becomes difficult to correct curvature of field and astigmatism at the telephoto end, and the optical performance deteriorates, which is problematic.
The rear fixed mirror group can move back and forth along the optical axis direction through the driving mechanism, and the active focusing compensation of defocusing generated by the compact uncooled long-wave infrared continuous zooming optical system under the conditions of different temperatures or different working distances is realized.
Preferably, the front fixed lens group, the zoom lens group, the compensation lens group, the aberration stabilizing lens group and the rear fixed lens group are made of germanium materials or chalcogenide materials.
Compared with the prior art, the invention has the following beneficial effects:
1. the compact uncooled long-wave infrared continuous zooming optical system adopts a mechanical compensation zooming mode, the zooming core is composed of a zooming group, a compensation group and an aberration stabilizing lens group, the structure of the three-action group is adopted, and the continuous zooming function with the focal length ratio not less than 1, the zoom ratio not less than 6 and the relative aperture not more than 1.2 can be realized. In the process of continuously changing the focal length, all focal length central view fields and all focal length edge view fields have better imaging quality.
2. The zoom nucleus consists of a zoom group, a compensation group and an aberration stabilizing group, continuous zooming is realized by the linear movement of the driving mechanism back and forth in the optical axis direction of the optical system according to a set rule, the zooming mode is simple and is internal zooming, the total length of the zooming process is fixed, and the change of the center of mass is small.
3. The front fixed lens group, the zoom lens group, the compensation lens group, the aberration stabilizing lens group and the rear fixed lens group of the system all adopt germanium materials or chalcogenide materials, and the system has better processing characteristics. When other infrared optical materials are adopted, the excellent imaging performance can be obtained only by correspondingly adjusting the focal power of each lens group.
4. The optical system diaphragm is fixedly arranged at one side of the compensating lens group close to the object plane, and images are formed at a far distance position at the image plane side through the rear aberration stabilizing lens group and the rear fixing lens group to form a quasi-image-space telecentric light path, so that the whole image plane can be ensured to have uniform relative illumination distribution.
5. The invention adopts a quasi-image space telecentric design combined with an optical vignetting mode, ensures that an optical system has better distortion characteristics under each field condition, and simultaneously can ensure that the imaging definition distribution under each field condition is more uniform.
6. The invention is suitable for various military and civil monitoring, observation, aiming, searching, tracking and the like.
7. The optical filter of the invention, which is placed in front of the focal plane, can be replaced, and when the optical system needs to work a long-wave infrared spectrum band, the optical filter is cut into a long-wave infrared band-pass filter; when the optical system needs to work in other spectral bands, the optical system is cut into the optical filter of the corresponding spectral band, and at the moment, the optical image of the corresponding spectral band can be obtained.
Drawings
FIG. 1 is a schematic view of a compact uncooled long-wavelength infrared continuous-zoom optical system lens model of the present invention;
FIG. 2 is a schematic view of a lens structure with different focal length positions according to an embodiment of the present invention;
FIG. 3 is a schematic view of a lens structure at two different focal positions according to an embodiment of the present invention;
FIG. 4 is a graph of MTF at 150mm focal length according to an embodiment of the present invention;
FIG. 5 is a graph of MTF at 25mm focal length according to an embodiment of the present invention;
FIG. 6 is a dot-column diagram of a focal length of 150mm according to an embodiment of the present invention;
FIG. 7 is a dot-column diagram of an embodiment of the invention at a focal length of 25 mm;
FIG. 8 is a diagram of relative distortion at a focal length of 150mm according to an embodiment of the present invention;
FIG. 9 is a diagram of relative distortion at a focal length of 25mm according to an embodiment of the present invention;
in the figure: 1 focal plane, 2 optical filters, 3 rear fixed lens groups, 4 aberration stabilizing lens groups, 5 compensating lens groups, 6 zoom lens groups, 7 front fixed lens groups and 8 object planes.
Detailed Description
In order to further clarify the features of the present invention, a detailed description is provided below in conjunction with the appended drawings to illustrate the invention, but it should not be construed as limiting the invention.
As shown in fig. 1, a compact uncooled long-wavelength infrared continuous zoom optical system includes a front fixed lens group 7, a zoom lens group 6, a compensation lens group 5, an aberration stabilizing lens group 4, a rear fixed lens group 3 and an optical filter 2, which are coaxially arranged in sequence from left to right along a light propagation direction; the right side of the optical filter 2 is a focal plane 1 (image plane) of the compact uncooled long-wave infrared continuous zooming optical system; the zoom lens group 6, the front fixed lens group 7, the compensation lens group 5, the aberration stabilizing lens group 4 and the rear fixed lens group 3 together form a complete imaging system.
As shown in fig. 2 and 3, the optical axis directions of the optical systems of the zoom lens group 6, the compensating lens group 5 and the aberration stabilizing lens group 4 linearly move back and forth (left and right directions in fig. 2) according to a certain rule, so as to realize continuous zooming; the driving mechanism can be a gear-guide rail mechanism, a cam-sleeve mechanism or a cam-guide rail mechanism and other similar driving mechanisms, and the total length of the system is not changed in the process of changing the focal length. The diaphragm is fixedly arranged at the position of one side of the compensating lens group 5 close to the object plane in the whole zooming process. When the field of view changes from a wide field of view to a narrow field of view, the zoom lens group 6 translates towards one side close to the focal plane 1 (image plane), and the compensating lens group and the aberration stabilizing lens group move adaptively; when the field of view changes from a narrow field of view to a wide field of view, the zoom lens group 6 moves towards one side of the direction of the object plane 8, and the compensation lens group and the aberration stabilizing lens group move adaptively; the focal length is continuously changed during the movement.
Example one
Various numerical data relating to the zoom optical system according to the first embodiment are shown below:
focal length range: 25 mm-150 mm
Clear imaging range: 3m to INF
F/# = 0.9-1.2, F # is the reciprocal of the ratio of the diaphragm aperture to the focal length, i.e. F ═ F/D
Total optical length: 150mm
Working spectral range: 8-12 μm
The size of the detector to the leg line: 14mm
Heat dissipation temperature range: minus 45 ℃ to plus 70 DEG C
Fig. 2 is a schematic view of a lens structure with different focal lengths according to an embodiment of the invention.
Tables 1, 2, and 3 below show various values relating to the optical system according to the present embodiment.
The optical system of the embodiment has less total number of lenses and better tolerance characteristic; the optical materials used by the lens groups are germanium materials, and the lens groups have better acquirable and processable characteristics.
In this embodiment, in the zooming process, the optical system diaphragm is fixedly located on one side of the compensation lens group close to the object plane, and images are formed at a very long distance on one side of the image plane through the compensation lens group and the pixel stabilizing lens group, so that the whole optical system forms a quasi-image-space telecentric design, and the relative illumination distribution of the image plane is improved.
In this embodiment, the germanium material may be replaced by a chalcogenide material or an infrared optical material, and only the corresponding parameters need to be readjusted.
In this embodiment, the total length from the surface of the front fixed mirror group 7 close to the object plane 8 to the image plane 1 is 150mm, the maximum aperture of each lens is less than 130mm, the focal length range is 25 mm-150 mm, and the zoom ratio is 6.
In the embodiment, the MTF is not less than 0.45 in the position of 30lp/mm in the 0.5 view field in the whole zooming process; in the full field range, at the position of 30lp/mm, MTF is not less than 0.3, and excellent imaging can be ensured. MTF evaluation curves at the long and short focal positions in this example are shown in fig. 4 and 5, respectively.
Fig. 6 and 7 show dot charts of the present embodiment in the telephoto and the short-focus positions, respectively. It can be seen that the present embodiment has better energy concentration characteristics at both the long and short focal positions and within the full field of view.
As shown in fig. 8 and 9, the relative distortion curves of the embodiment at the long-focus and short-focus positions are respectively shown, and it can be seen that the embodiment has small relative distortion at the long-focus and short-focus positions, and image distortion is hardly generated.
Example two
Various numerical data relating to the zoom optical system according to the second embodiment are as follows:
focal length range: 25 mm-200 mm
Clear imaging range: 3m to INF
F/#=0.95~1.2
Total optical length: 200mm
Working spectral range: 8-12 μm
The size of the detector to the leg line: 19.6mm
Heat dissipation temperature range: minus 45 ℃ to plus 70 DEG C
Fig. 3 is a schematic view of a lens structure at two different focal length positions according to an embodiment of the invention.
Tables 4, 5 and 6 below show various values relating to the optical system according to the present embodiment.
In this embodiment, the total length from the surface of the front fixed mirror group 7 close to the object plane 8 to the image plane 1 is 200mm, the maximum aperture of each lens is less than 170mm, the focal length range is 25 mm-200 mm, and the zoom ratio is 8.
In this embodiment, the rear fixed lens group 3 has a positive focal power, and is composed of two lenses having positive focal power, which are meniscus positive lenses 3-2 and 3-1, respectively. The lens close to the image side can move back and forth along the optical axis direction through the driving mechanism, and active focusing compensation of defocusing generated by the compact uncooled long-wave infrared continuous zooming optical system under the conditions of different temperatures or different working distances is realized.
From the data, the optical structure can realize the zoom ratio of more than 8 times and the focal length ratio of not less than 1 by only using 5-6 lenses, and effectively shortens the total length of the conventional optical structure.
The foregoing description of the invention using examples is intended to be exemplary and not to limit the scope of the invention. It will therefore be apparent to those skilled in the art that substitutions and modifications of the features of the invention as described can be made without departing from the scope of the claims set out below.
Claims (7)
1. An uncooled long-wave infrared continuous zooming optical system is provided with a front fixed lens group, a zoom lens group, a compensation lens group, an aberration stabilizing lens group, a rear fixed lens group and an optical filter in sequence from an object plane to a focal plane along an optical axis, and is characterized in that the zoom lens group, the compensation lens group and the aberration stabilizing lens group linearly move back and forth along the optical axis direction to realize continuous zooming, and the rear fixed lens group moves back and forth along the optical axis direction to realize defocusing compensation; the front fixed lens group has positive focal power, the zoom lens group has negative focal power, the compensation lens group has positive focal power, the aberration stabilizing lens group has negative focal power, and the rear fixed lens group has positive focal power; the front fixed lens group is a single-piece meniscus lens, the paraxial part of the object side surface of the front fixed lens group is a convex surface, and the paraxial part of the image side surface of the front fixed lens group is a concave surface; the zoom lens group is a single-chip biconcave lens; the compensating lens group is a single-sheet type double convex lens, and the aberration stabilizing lens group is a single-sheet type lens; the rear fixed lens group is a single-piece type or double-separation type lens; the focal length of the lens group meets the following conditions:
0.8 < |fL/f7| < 2.3；
1.5 < |fL/f4| < 2.7；
3.8 < |fL/f3| < 5.6；
0.9 < |m6| < 1.5；
0.7 < |m7| < 1.2；
wherein, fL is the focal length of the long focal end of the optical system, f7 is the focal length of the front fixed lens group, and f4 is the focal length of the aberration stabilizing lens group; f3 is the focal length of the rear fixed lens group; m6 is the magnification of the zoom lens group at the telephoto position, and m5 is the magnification of the compensation lens group at the telephoto position; the front fixed lens group, the zoom lens group, the compensation lens group and the aberration stabilizing lens group are made of germanium materials, and the rear fixed lens group is made of germanium materials or chalcogenide materials.
2. The uncooled long-wave infrared continuous zoom optical system of claim 1, wherein a diaphragm is fixedly connected to a side of the compensating lens group close to the object plane.
3. The uncooled long wave infrared continuous zoom optical system of claim 1, wherein the optical filter is a bandpass filter.
4. An uncooled long wave infrared continuous zoom optical system of claim 1, wherein the total length of the optical system is 150mm, the maximum aperture of each lens is less than 130mm, the focal length range is: the zoom lens group comprises 25-150 mm, the movement interval between the front fixed lens group and the zoom lens group is 18.05-53.08 mm, the movement interval between the zoom lens group and the compensation lens group is 1.5-48.9 mm, the movement interval between the compensation lens group and the aberration stabilizing lens group is 12.63-28.74 mm, and the movement interval between the aberration stabilizing lens group and the rear fixed lens group is 25.02-31.85 mm.
5. The uncooled long-wave infrared continuous zoom optical system of claim 4, wherein the rear fixed lens group is a single-piece meniscus positive lens, all the lenses are made of germanium material, the front fixed lens group is aspheric on the side close to the object plane, the zoom lens group is aspheric on the side close to the focal plane, the compensation lens group is diffractive aspheric on the side close to the object plane, the aberration stabilizing lens group is aspheric on the side close to the focal plane, and both rear fixed lens groups are aspheric.
6. An uncooled long wave infrared continuous zoom optical system according to claim 1, wherein the total length of the optical system is 200mm, the maximum aperture of each lens is less than 170mm, the focal length range is: the zoom lens group comprises 25-200 mm, the moving interval between the front fixed lens group and the zoom lens group is 8-80.11 mm, the moving interval between the zoom lens group and the compensating lens group is 2-86.4 mm, the moving interval between the compensating lens group and the aberration stabilizing lens group is 3-19.92 mm, and the moving interval between the aberration stabilizing lens group and the rear fixed lens group is 3.02-11.87 mm.
7. The uncooled long-wave infrared continuous zoom optical system of claim 6, wherein the rear fixed lens group is a double-split lens consisting of a chalcogenide lens and a germanium lens, the front fixed lens group is aspheric on the side close to the object plane, the zoom lens group is aspheric on the side close to the focal plane, the compensation lens group is diffractive aspheric on the side close to the object plane, the aberration stabilizing lens group is aspheric on the side close to the focal plane, the positive lens of the rear fixed lens group is aspheric on the side close to the object plane, and the negative lens of the rear fixed lens group is aspheric on the side close to the focal plane.
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| JP2628633B2 (en) * | 1986-04-25 | 1997-07-09 | オリンパス光学工業株式会社 | Compact zoom lens |
| JPH05215967A (en) * | 1992-02-04 | 1993-08-27 | Konica Corp | Wide-angle high variable power zoom lens with fixed group of positive refracting power |
| CN203965714U (en) * | 2014-06-26 | 2014-11-26 | 北京蓝思泰克科技有限公司 | A kind of long-focus long-wave infrared continuous zoom lens |
| CN203965716U (en) * | 2014-06-26 | 2014-11-26 | 北京蓝思泰克科技有限公司 | A kind of large aperture long-wave infrared continuous zoom lens |
| CN205427294U (en) * | 2015-11-30 | 2016-08-03 | 三河市蓝思泰克光电科技有限公司 | Big light ring long wave infrared continuous zooming monitoring camera |
| CN205539680U (en) * | 2015-11-30 | 2016-08-31 | 三河市蓝思泰克光电科技有限公司 | Long -focus long wave infrared continuous zoom lens |
| CN105334603B (en) * | 2015-12-05 | 2018-01-09 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of visual field LONG WAVE INFRARED imaging optical system of axial zoom three |
| CN205263386U (en) * | 2015-12-07 | 2016-05-25 | 三河市蓝思泰克光电科技有限公司 | Long -focus long wave infrared continuous zoom lens |
| CN205787330U (en) * | 2015-12-16 | 2016-12-07 | 三河市蓝思泰克光电科技有限公司 | A kind of long-wave infrared continuous zoom lens |
| CN207216127U (en) * | 2017-08-22 | 2018-04-10 | 北京蓝思泰克科技有限公司 | A kind of long-focus long-wave infrared continuous zoom lens |
| CN209182571U (en) * | 2018-09-14 | 2019-07-30 | 三河市蓝思泰克光电科技有限公司 | A kind of economical long-wave infrared continuous zoom lens of portable long-focus |
| CN209560187U (en) * | 2019-04-26 | 2019-10-29 | 郑州阿特尔光电技术有限公司 | A kind of non-brake method double-view field infrared measurement of temperature imaging optical system |
| CN210090813U (en) * | 2019-06-27 | 2020-02-18 | 三河市蓝思泰克光电科技有限公司 | Economical thermal imaging continuous zoom lens |
-
2021
- 2021-01-19 CN CN202110069261.9A patent/CN112684598B/en active Active
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