CN112666690A - Switching refrigeration type long-wave infrared double-view-field lens - Google Patents
Switching refrigeration type long-wave infrared double-view-field lens Download PDFInfo
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- CN112666690A CN112666690A CN202011572268.4A CN202011572268A CN112666690A CN 112666690 A CN112666690 A CN 112666690A CN 202011572268 A CN202011572268 A CN 202011572268A CN 112666690 A CN112666690 A CN 112666690A
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Abstract
The invention provides a switching refrigeration type long-wave infrared double-view-field lens which comprises a front lens group A, a rear lens group C and a zoom switching lens group B, wherein the zoom switching lens group B is positioned between the front lens group A and the rear lens group C and can realize zoom switching; the zoom switching lens group B is fixed on a rotatable mechanism, and the field of view switching is realized through 90-degree rotation.
Description
Technical Field
The invention relates to a switching refrigeration type long-wave infrared double-view-field lens.
Background
The double-view-field optical system has a simpler structure than a continuous zoom lens, can realize switching between the view fields only by changing the interval between the lens groups, has high switching speed and easy assembly and adjustment, and plays an irreplaceable role in modern military. At present, an infrared double-view-field optical system mainly realizes view field switching through an axial movement zoom group, and due to the fact that the axial size of the axial movement type is large, view field switching cannot be realized in a short time, and target miss of high-speed movement is easily caused. The switching mode changes the focal length by switching the lens group in the optical system, and the mode has the characteristics that no moving optical element is arranged on the light path, the optical axis stability is good, the switching time is short, the number of the optical elements is small, the transmittance of the system is high, and the whole weight is lighter.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is that the field switching of the existing infrared double-field optical system is mainly realized by axially moving the zoom group, and the field switching cannot be realized in a short time due to the larger axial size of the axially moving type, so that the high-speed moving target miss stability is easy to cause.
The specific embodiment of the invention is as follows: the switching refrigeration type long-wave infrared double-view-field lens comprises a front lens group A, a rear lens group C and a zoom switching lens group B which is positioned between the front lens group A and the rear lens group C and can realize zoom switching;
the front lens group A comprises a positive meniscus lens A1 with the convex surface facing the object plane and a negative meniscus lens A2 with the convex surface facing the object plane from the object plane to the image plane;
the rear lens group C comprises a positive meniscus lens C1 with a concave surface facing the object plane and a positive meniscus lens C2 with a convex surface facing the object plane from the object plane to the image plane;
the zoom switching lens group B comprises a meniscus negative lens B1 with a concave surface facing the object plane, and the meniscus negative lens is arranged along the axial direction from the object plane to the image plane; a biconvex positive lens B2; a positive meniscus lens B3 with its convex surface facing the object plane and a negative meniscus lens B4 with its convex surface facing the object plane;
the zoom switching lens group B is fixed on a rotatable mechanism, and the switching of the visual fields of the lenses of the zoom switching lens group B, which are coaxial or vertical to the lenses of the front lens group A and the rear lens group C, is realized through 90-degree rotation.
Further, when the respective lenses of the variable power switching lens group B are coaxially disposed with the lenses of the front lens group a and the rear lens group C;
the air space between the front lens group A and the zoom switching lens group B is 22.98mm, and the air space between the zoom switching lens group B and the rear lens group C is 30.33 mm;
the air space between the positive meniscus lens a1 and the negative meniscus lens a2 was 59.93 mm;
the air space between the positive meniscus lens C1 and the positive meniscus lens C2 is 26.83 mm;
the air space between the negative meniscus lens B1 and the positive biconvex lens B2 was 24.44mm, the air space between the positive biconvex lens B2 and the positive meniscus lens B3 was 48mm, and the air space between the positive meniscus lens B3 and the negative meniscus lens B4 was 17.98 mm.
Further, the material of the positive meniscus lens a1 and the negative meniscus lens a2 is germanium single crystal, and the material of the positive meniscus lens C1 and the positive meniscus lens C2 is germanium single crystal.
Further, the material of the meniscus negative lens B1 is chalcogenide glass; the biconvex positive lens B2 is made of germanium single crystal; the material of the meniscus positive lens B3 is germanium single crystal; the material of the meniscus negative lens B4 is chalcogenide glass.
Compared with the prior art, the invention has the following beneficial effects: the invention adopts a secondary imaging structure, a small visual field optical system consists of four lenses, a large visual field is switched into a zoom switching group on the basis of the small visual field optical system, a large visual field optical system consists of eight lenses, wherein the zoom switching group consists of four lenses, and the zoom switching group rotates 90 degrees through a 90-degree rotating frame to realize large and small visual field switching, wherein the small visual field corresponds to a switching-out position, and the large visual field corresponds to a switching-in position.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a graph of the MTF curve for the tele of the dual field lens of the present invention.
FIG. 3 is a MTF curve of the short focus of the dual field lens of the present invention.
FIG. 4 is a long focal list of the present invention.
FIG. 5 is a short focal list of the present invention.
FIG. 6 is a tele-field curvature distortion diagram of the dual field lens.
FIG. 7 is a short-focus distortion plot of the dual field lens.
In the figure: 11-meniscus positive lens A1, 12-meniscus negative lens A2, 21-meniscus negative lens B1, 21-biconvex positive lens B2, 22-biconvex positive lens B2, 23-meniscus positive lens B3, 24-meniscus negative lens B4, 31-meniscus positive lens C1 and 32-meniscus positive lens C2.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 7, the switching refrigeration type long-wave infrared dual-field lens includes a front lens group a, a rear lens group C, and a zoom switching lens group B located between the front lens group a and the rear lens group C and capable of realizing zoom switching;
the front lens group A comprises a positive meniscus lens A1 with the convex surface facing the object plane and a negative meniscus lens A2 with the convex surface facing the object plane from the object plane to the image plane;
the rear lens group C comprises a positive meniscus lens C1 with a concave surface facing the object plane and a positive meniscus lens C2 with a convex surface facing the object plane from the object plane to the image plane;
the zoom switching lens group B comprises a meniscus negative lens B1 with a concave surface facing the object plane, and the meniscus negative lens is arranged along the axial direction from the object plane to the image plane; a biconvex positive lens B2; a positive meniscus lens B3 with its convex surface facing the object plane and a negative meniscus lens B4 with its convex surface facing the object plane;
the zoom switching lens group B is fixed on a rotatable mechanism, and the switching of the visual fields of the lenses of the zoom switching lens group B, which are coaxial or vertical to the lenses of the front lens group A and the rear lens group C, is realized through 90-degree rotation.
In the present embodiment, when each lens of the variable power switching lens group B is coaxially disposed with the lenses of the front lens group a and the rear lens group C;
the air space between the front lens group A and the zoom switching lens group B is 22.98mm, and the air space between the zoom switching lens group B and the rear lens group C is 30.33 mm;
the air space between the positive meniscus lens a1 and the negative meniscus lens a2 was 59.93 mm;
the air space between the positive meniscus lens C1 and the positive meniscus lens C2 is 26.83 mm;
the air space between the negative meniscus lens B1 and the positive biconvex lens B2 was 24.44mm, the air space between the positive biconvex lens B2 and the positive meniscus lens B3 was 48mm, and the air space between the positive meniscus lens B3 and the negative meniscus lens B4 was 17.98 mm.
In this embodiment, the material of the positive meniscus lens a1 and the material of the negative meniscus lens a2 are germanium single crystals, and the material of the positive meniscus lens C1 and the material of the positive meniscus lens C2 are germanium single crystals.
In this embodiment, when the lenses of the variable power switching lens group B are coaxially disposed with the lenses of the front lens group a and the rear lens group C, the data table of the lenses along the object plane to the image plane is as follows: the data in the following table illustrate the optical parameters, surface numbers, of the embodiments of the present invention.
Table one: optical element parameter table:
table two: aspheric surface related data:
the aspheric expression is:
in the above table, Z represents the position in the optical axis direction, r represents the height in the vertical direction with respect to the optical axis, c represents the radius of curvature, and k represents the conic coefficient
Representing aspheric coefficients. In aspherical data, E-n represents "
", e.g. 2.2722E-009 stands for
。
As can be seen from fig. 2 and fig. 3, the MTF curves of the long and short foci of the dual-field-of-view lens are both close to the diffraction limit, and have higher resolution, thereby meeting the transfer function requirements of the 640 x 512,15um refrigeration type long-wave infrared detector. As can be seen from FIGS. 4 and 5, the RMS diffuse spot radius of each field of view of the lens is smaller than the Airy spot radius, which shows that the system has good imaging quality and meets the requirements. The field curvature and distortion curve of the optical system are shown in fig. 6 and 7, and the maximum relative distortion is less than 3%, which indicates that the relative distortion of the system meets the requirement.
The invention adopts a secondary imaging structure type, a small visual field optical system formed by a front lens group A and a rear lens group C, and a large visual field cut into the variable magnification switching lens group B on the basis of the small visual field optical system, wherein the variable magnification switching lens group B rotates 90 degrees through a 90-degree rotating frame to realize large and small visual field switching, the small visual field corresponds to a cut-out position, and the large visual field corresponds to a cut-in position. The reasonable distribution of optical power in combination with the use of even aspheric surfaces to balance the system aberrations allows the overall volume of the optical system to be sufficiently small. The YNI value of the cold reflection light on each refraction surface is improved by changing the curvature of the lens or changing the interval, so that the cold light generates defocusing when returning to the detector and is blocked by the cold diaphragm and other apertures, and the cold reflection intensity is reduced; the sensitivity of each optical element is reduced through the adjustment of the curvature and the thickness, so that the lens is easier to process and adjust.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (4)
1. The switching refrigeration type long-wave infrared double-view-field lens is characterized by comprising a front lens group A, a rear lens group C and a zoom switching lens group B which is positioned between the front lens group A and the rear lens group C and can realize zoom switching;
the front lens group A comprises a positive meniscus lens A1 with the convex surface facing the object plane and a negative meniscus lens A2 with the convex surface facing the object plane from the object plane to the image plane;
the rear lens group C comprises a positive meniscus lens C1 with a concave surface facing the object plane and a positive meniscus lens C2 with a convex surface facing the object plane from the object plane to the image plane;
the zoom switching lens group B comprises a meniscus negative lens B1 with a concave surface facing the object plane, and the meniscus negative lens is arranged along the axial direction from the object plane to the image plane; a biconvex positive lens B2; a positive meniscus lens B3 with its convex surface facing the object plane and a negative meniscus lens B4 with its convex surface facing the object plane;
the zoom switching lens group B is fixed on a rotatable mechanism, and the switching of the visual fields of the lenses of the zoom switching lens group B, which are coaxial or vertical to the lenses of the front lens group A and the rear lens group C, is realized through 90-degree rotation.
2. The switching refrigeration type long-wave infrared dual-field lens according to claim 1, wherein when each lens of the zoom switching lens group B is coaxially disposed with the lenses of the front lens group a and the rear lens group C;
the air space between the front lens group A and the zoom switching lens group B is 22.98mm, and the air space between the zoom switching lens group B and the rear lens group C is 30.33 mm;
the air space between the positive meniscus lens a1 and the negative meniscus lens a2 was 59.93 mm;
the air space between the positive meniscus lens C1 and the positive meniscus lens C2 is 26.83 mm;
the air space between the negative meniscus lens B1 and the positive biconvex lens B2 was 24.44mm, the air space between the positive biconvex lens B2 and the positive meniscus lens B3 was 48mm, and the air space between the positive meniscus lens B3 and the negative meniscus lens B4 was 17.98 mm.
3. The switched refrigeration type long-wave infrared double-field-of-view lens as claimed in claim 1 or 2, wherein the materials of the positive meniscus lens A1 and the negative meniscus lens A2 are germanium single crystals, and the materials of the positive meniscus lens C1 and the positive meniscus lens C2 are germanium single crystals.
4. The switching refrigeration type long-wave infrared double-field-of-view lens according to claim 1 or 2, wherein the meniscus negative lens B1 is made of chalcogenide glass; the biconvex positive lens B2 is made of germanium single crystal; the material of the meniscus positive lens B3 is germanium single crystal; the material of the meniscus negative lens B4 is chalcogenide glass.
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| CN202011572268.4A CN112666690B (en) | 2020-12-28 | 2020-12-28 | Switching refrigeration type long-wave infrared double-view-field lens |
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| CN202011572268.4A CN112666690B (en) | 2020-12-28 | 2020-12-28 | Switching refrigeration type long-wave infrared double-view-field lens |
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| CN112666690B CN112666690B (en) | 2022-11-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924392A (en) * | 2022-04-29 | 2022-08-19 | 福建福光股份有限公司 | Medium wave refrigeration double-view-field infrared lens |
| CN114967030A (en) * | 2022-05-06 | 2022-08-30 | 福建福光股份有限公司 | Two-gear focal length switching type infrared lens |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989962A (en) * | 1988-10-31 | 1991-02-05 | Hughes Aircraft Company | Dual band/dual FOV infrared telescope |
| JPH05196889A (en) * | 1991-09-11 | 1993-08-06 | Hughes Aircraft Co | Optical system for forming image again using optical element for refraction and diffraction |
| GB2339619A (en) * | 1998-05-14 | 2000-02-02 | Pilkington Perkin Elmer Ltd | Dual field of view objective lens with switchable intermediate lens |
| CN205643832U (en) * | 2016-05-06 | 2016-10-12 | 西安微普光电技术有限公司 | Burnt medium wave of well length becomes times optical lens for infrared two grades |
| CN205809399U (en) * | 2016-06-01 | 2016-12-14 | 北京蓝思泰克科技有限公司 | A kind of long-focus cut-in type medium wave refrigeration mode double-view field infrared optical lens |
| CN109116528A (en) * | 2017-06-23 | 2019-01-01 | 北京遥感设备研究所 | It is a kind of to cut out formula dual field-of-view infrared optical system |
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2020
- 2020-12-28 CN CN202011572268.4A patent/CN112666690B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989962A (en) * | 1988-10-31 | 1991-02-05 | Hughes Aircraft Company | Dual band/dual FOV infrared telescope |
| JPH05196889A (en) * | 1991-09-11 | 1993-08-06 | Hughes Aircraft Co | Optical system for forming image again using optical element for refraction and diffraction |
| GB2339619A (en) * | 1998-05-14 | 2000-02-02 | Pilkington Perkin Elmer Ltd | Dual field of view objective lens with switchable intermediate lens |
| CN205643832U (en) * | 2016-05-06 | 2016-10-12 | 西安微普光电技术有限公司 | Burnt medium wave of well length becomes times optical lens for infrared two grades |
| CN205809399U (en) * | 2016-06-01 | 2016-12-14 | 北京蓝思泰克科技有限公司 | A kind of long-focus cut-in type medium wave refrigeration mode double-view field infrared optical lens |
| CN109116528A (en) * | 2017-06-23 | 2019-01-01 | 北京遥感设备研究所 | It is a kind of to cut out formula dual field-of-view infrared optical system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924392A (en) * | 2022-04-29 | 2022-08-19 | 福建福光股份有限公司 | Medium wave refrigeration double-view-field infrared lens |
| CN114924392B (en) * | 2022-04-29 | 2023-08-11 | 福建福光股份有限公司 | Medium wave refrigeration double-view-field infrared lens |
| CN114967030A (en) * | 2022-05-06 | 2022-08-30 | 福建福光股份有限公司 | Two-gear focal length switching type infrared lens |
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