CN221426937U - Entrance pupil position preposed large-area array medium-wave infrared double-view-field optical system and long-focus optical system - Google Patents
Entrance pupil position preposed large-area array medium-wave infrared double-view-field optical system and long-focus optical system Download PDFInfo
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- CN221426937U CN221426937U CN202322978825.8U CN202322978825U CN221426937U CN 221426937 U CN221426937 U CN 221426937U CN 202322978825 U CN202322978825 U CN 202322978825U CN 221426937 U CN221426937 U CN 221426937U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 91
- 210000001747 pupil Anatomy 0.000 title claims abstract description 31
- 230000005499 meniscus Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 229910052732 germanium Inorganic materials 0.000 claims description 6
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 6
- 239000002210 silicon-based material Substances 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims 6
- 238000013461 design Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000005387 chalcogenide glass Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
The utility model provides a front-entry pupil position large area array medium-wave infrared double-view-field optical system and a long-focus optical system, which relate to the technical field of optical systems, wherein the system sequentially comprises a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group, a detector window and a cold diaphragm from an object plane to an image plane; the light-weight and miniaturization of the optical system are facilitated, and the optical system can be switched to large-view-field searching.
Description
Technical Field
The utility model relates to the technical field of optical systems, in particular to an entrance pupil position front-mounted large area array medium-wave infrared double-view-field optical system and a long-focus optical system.
Background
The switching speed of the double-view-field optical system is high, and the phenomenon of target loss cannot occur in the switching process, so that the double-view-field optical system can adapt to working environments of different scenes; when the entrance pupil position is preposed, the double-view-field optical system is combined with the afocal optical system to form a long-focus optical system, so that long-distance detection is realized, searching is performed when the long-view-field optical system is switched to a large view field, and meanwhile, the long-focus optical system formed by the double-view-field optical system and the afocal optical system is also applied to an airborne photoelectric pod, so that the system is also called an airborne infrared searching and tracking system.
The Chinese patent with publication number CN113433677A discloses a refrigeration type double-view-field infrared optical system with an external entrance pupil, an area array with the diagonal dimension of 12.3mm of an adaptive detector is realized by adopting silicon materials, germanium materials and chalcogenide glass through variable-magnification group switching, the entrance pupil position is external, and the structural form is not suitable for the adaptation of a large-area array-scale detector, and the transmittance is low by adopting chalcogenide glass.
Chinese patent publication No. CN111290103a discloses a large area array medium wave infrared dual-view field optical system, which can be adapted to 2720×2720 pixels, the medium wave refrigeration detector with pixel size of 15 μm, and the dual-view field is realized by switching zoom groups, but the entrance pupil position is not preposed, and effective adaptation with front-end afocal optical system cannot be realized, and the system structure is complex.
Disclosure of utility model
Therefore, the technical problem to be solved by the utility model is to overcome the defects that the entrance pupil position is not preposed, the system structure is complex, the transmittance of lens materials is low, the lens materials are not well matched with a large-area array-scale detector, and the effective adaptation with a front-end afocal optical system cannot be realized, so that the wave infrared double-view-field optical system and the long-focus optical system in the large-area array with the preposed entrance pupil position are provided.
In order to solve the problems, the utility model provides an entrance pupil position front-mounted large area array medium wave infrared double-view-field optical system, which sequentially comprises a front fixed lens group, a zoom lens group, a compensation lens group, a rear fixed lens group, a detector window and a cold diaphragm from an object plane to an image plane; the direction from the object plane to the image plane is positive and the direction from the image plane to the object plane is negative; the focal power of the front fixed lens group is positive, and the front fixed lens group comprises a first lens and a second lens which are sequentially arranged along the positive direction of the optical axis; the focal power of the variable magnification lens group is negative, and the variable magnification lens group comprises a third lens and a fourth lens which are sequentially arranged along the positive direction of the optical axis; the focal power of the compensation lens group is positive, and the compensation lens group comprises a fifth lens which is arranged along the positive direction of the optical axis; the focal power of the rear fixed lens group is positive, and the rear fixed lens group comprises a sixth lens and a seventh lens which are sequentially arranged along the positive direction of the optical axis.
The third, fourth, and fifth lenses all move along the optical axis to switch the field of view.
Further, the first, third, fifth and seventh lenses are all made of a silicon material, and the second, fourth and sixth lenses are all made of a germanium material.
Further, the first lens is a spherical lens, and the front surface and the rear surface of the first lens are both spherical surfaces; the second lens is a spherical lens, and the front surface and the rear surface of the second lens are both spherical surfaces.
Further, the third lens is a meniscus aspherical lens, the front surface of the third lens is an aspherical surface, and the rear surface of the third lens is a spherical surface; the fourth lens is a meniscus aspherical lens, the front surface of the fourth lens is an aspherical surface, and the rear surface of the fourth lens is a spherical surface.
Further, the fifth lens is a meniscus aspherical lens, a front surface of the fifth lens is an aspherical surface, and a rear surface of the fifth lens is a spherical surface.
Further, the sixth lens is a meniscus aspherical lens, the front surface of the sixth lens is an aspherical surface, and the rear surface of the sixth lens is a spherical surface; the seventh lens is a biconvex spherical lens, and the front surface and the rear surface of the seventh lens are both convex spherical surfaces.
Further, a plane reflecting mirror is arranged between the front fixed lens group and the variable magnification lens group.
Further, a plane reflecting mirror is arranged between the variable magnification lens group and the compensating lens group.
The utility model also comprises a long-focus optical system, which comprises the front entrance pupil double-view optical system and the afocal optical system.
The beneficial effects of the utility model are as follows:
1. According to the entrance pupil position preposed large area array medium wave infrared double-view-field optical system and the long-focus optical system, the wide view field and the narrow view field are switched in a mode that the zoom lens group and the compensation lens group move simultaneously, so that the lens diameter sizes of the front fixed group lens, the zoom lens and the compensation lens are effectively reduced, and the optical system is miniaturized, light and simplified in structure;
2. When the technical scheme provided by the utility model is arranged at the front of the entrance pupil position, the system can be well adapted to a large area array detector and is matched with a afocal optical system at the same time, so that a long-focus optical system is formed to realize long-distance detection and large-view-field search;
3. In the technical scheme provided by the utility model, each lens is made of a silicon material or a germanium material, and has high transmittance and good optical manufacturability.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an optical path model according to the present utility model;
FIG. 2 is a schematic diagram of a system for switching to a wide field of view according to the present utility model;
FIG. 3 is a schematic diagram of a system for switching to a narrow field of view according to the present utility model;
FIG. 4 is a graph of the wide field of view design Modulation Transfer Function (MTF) of FIG. 2;
fig. 5 is a graph of the narrow field of view design Modulation Transfer Function (MTF) of fig. 3.
Reference numerals illustrate:
1-entrance pupil position; 2-a front fixed lens group; 3-magnification-varying lens group;
4-compensating lens group; 5-a rear fixed lens group; 6-a detector window;
7-cold diaphragm; 201-a first lens; 202-a second lens;
301-a third lens; 302-a fourth lens; 401-a fifth lens;
501-a sixth lens; 502-seventh lens.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1 to 3, an entrance pupil position front-located large area array medium-wave infrared dual-field optical system, the parameters of the optical system in this embodiment are as follows:
Focal length: 150mm/250mm;
F#：4.0；
Entrance pupil position: 210mm (distance of entrance pupil from first lens vertex at wide field of view);
Working wave band: 3.7-4.8 μm;
adapting the detector: 1280×1024@15um;
Operating temperature: -40 to +60℃.
The entrance pupil position front-mounted large area array medium wave infrared double-view-field optical system sequentially comprises a front fixed lens group 2, a zoom lens group 3, a compensation lens group 4, a rear fixed lens group 5, a detector window 6 and a cold light diaphragm 7 from an object plane to an image plane; the direction from the object plane to the image plane is positive and the direction from the image plane to the object plane is negative; the focal power of the front fixed lens group 2 is positive, and the front fixed lens group 2 comprises a first lens 201 and a second lens 202 which are sequentially arranged along the positive direction of the optical axis; the focal power of the variable power lens group 3 is negative, and the variable power lens group 3 comprises a third lens 301 and a fourth lens 302 which are sequentially arranged along the positive direction of the optical axis; the focal power of the compensation lens group 4 is positive, and the compensation lens group 4 comprises a fifth lens 401 which is arranged along the positive direction of the optical axis; the focal power of the rear fixed lens group 5 is positive, and the rear fixed lens group 5 comprises a sixth lens 501 and a seventh lens 502 which are sequentially arranged along the positive direction of the optical axis; the third lens 301, the fourth lens 302, and the fifth lens 401 all move along the optical axis to switch the field of view.
The zoom lens group 3 and the compensation lens group 4 simultaneously move along the positive direction or the negative direction of the optical axis to realize the switching of a wide view field and a narrow view field; when the variable magnification lens group 3 moves along the forward direction of the optical axis and is far away from the front fixed lens group 2, and the compensating lens group 4 moves along the forward direction of the optical axis and is close to the rear fixed lens group 5, the system is wide in view field; when the variable magnification lens group 3 moves along the negative direction of the optical axis, approaching the front fixed lens group 2, and the compensation lens group 4 moves along the negative direction of the optical axis, moving away from the rear fixed lens group 5, the system is of a narrow field of view.
The optical system realizes the switching between a wide view field and a narrow view field by adopting the mode that the variable magnification lens group 3 and the compensation lens group 4 move simultaneously, effectively reduces the lens diameter sizes of the front fixed lens group 2, the variable magnification lens group 3 and the compensation lens group 4, and is beneficial to realizing the miniaturization, the light weight and the simplification of the structure of the optical system; when the entrance pupil position is preposed, the system can be well adapted to a large area array detector and is matched with the afocal optical system, so that the long-focus optical system is formed to realize long-distance detection and large-field search.
As shown in fig. 2 and 3, in the present embodiment, the first lens 201, the third lens 301, the fifth lens 401, and the seventh lens 502 are made of a silicon material; the second lens 202, the fourth lens 302 and the sixth lens 501 are made of germanium materials, the silicon materials and the germanium materials are low in price and good in manufacturability, the processing of spherical surfaces, aspherical surfaces and diffraction surfaces is easy to achieve, and the transmittance after film coating is high.
As shown in fig. 2 and 3, in the present embodiment, the first lens 201 is a spherical lens, and both front and rear surfaces of the first lens 201 are spherical surfaces; the second lens 202 is a spherical lens, and both the front and rear surfaces of the second lens 202 are spherical surfaces; the third lens 301 is a meniscus aspherical lens, the front surface of the third lens 301 is an aspherical surface, and the rear surface of the third lens 301 is a spherical surface; the fourth lens 302 is a meniscus aspherical lens, the front surface of the fourth lens 302 is an aspherical surface, and the rear surface of the fourth lens 302 is a spherical surface; the fifth lens 401 is a meniscus aspherical lens, the front surface of the fifth lens 401 is an aspherical surface, and the rear surface of the fifth lens 401 is a spherical surface; the sixth lens 501 is a meniscus aspherical lens, the front surface of the sixth lens 501 is an aspherical surface, and the rear surface of the sixth lens 501 is a spherical surface; the seventh lens 502 is a biconvex spherical lens, and both the front and rear surfaces of the seventh lens 502 are convex spherical surfaces. Different types of lenses are selected to match and correct aberration, so that good imaging quality is obtained; the spherical lens is favorable for realizing aberration correction, the aspheric surface can effectively correct off-axis aberration, the number of lenses in the system is reduced, and the miniaturized design of the optical system is realized.
As shown in fig. 2 and 3, light enters from the front entrance pupil position 1, passes through the first lens 201 and the second lens 202, enters the third lens 301 and the fourth lens 302, and has a wide field of view when the third lens 301 and the fourth lens 302 move in the positive direction of the optical axis, and has a narrow field of view when the third lens 301 and the fourth lens 302 move in the negative direction of the optical axis; meanwhile, the third lens 301 and the fourth lens 302 perform high-low temperature environment compensation and near-far view observation compensation; the light rays are then incident on the fifth lens 401, and the system is wide in view when the fifth lens 401 moves positively along the optical axis, and narrow in view when the fifth lens 401 moves negatively along the optical axis; meanwhile, the fifth lens 401 compensates for the image plane shift caused by the movement of the third lens 301 and the fourth lens 302; finally, the light is emitted via a sixth lens 501, a seventh lens 502, a detector window 6 and a cold stop 7.
As shown in fig. 4, the wide field design modulation transfer function graph and the narrow field design modulation transfer function graph shown in fig. 5, DIFF LIMIT represent diffraction limits of the system, and the graph curves are close to the diffraction limits, so that the imaging quality of the system is clear.
In addition, according to the requirement of the space envelope, a plane mirror may be inserted between the front fixed lens group 2 and the variable magnification lens group 3 or a plane mirror may be inserted between the variable magnification lens group 3 and the compensation lens group 4 to turn the optical path to reduce the envelope.
The utility model also comprises a long-focus optical system, wherein the long-focus optical system comprises the entrance pupil position front-arranged large area array medium-wave infrared double-view-field optical system and an afocal optical system, and the afocal optical system is also called a far-focus system or an afocal system, and refers to an optical system without net divergence or net focusing of light beams, namely, the equivalent focal length of the optical system is infinite, which belongs to the prior art, and therefore, the description is omitted here.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (9)
1. The entrance pupil position prepositioned large area array medium wave infrared double-view-field optical system is characterized by comprising a front fixed lens group (2), a variable magnification lens group (3), a compensation lens group (4), a rear fixed lens group (5), a detector window (6) and a cold light diaphragm (7) in sequence from an object plane to an image plane;
the direction from the object plane to the image plane is positive and the direction from the image plane to the object plane is negative;
The focal power of the front fixed lens group (2) is positive, and the front fixed lens group (2) comprises a first lens (201) and a second lens (202) which are sequentially arranged along the positive direction of the optical axis;
the focal power of the variable magnification lens group (3) is negative, and the variable magnification lens group (3) comprises a third lens (301) and a fourth lens (302) which are sequentially arranged along the positive direction of the optical axis;
The optical power of the compensation lens group (4) is positive, and the compensation lens group (4) comprises a fifth lens (401) which is arranged along the positive direction of the optical axis;
The focal power of the rear fixed lens group (5) is positive, and the rear fixed lens group (5) comprises a sixth lens (501) and a seventh lens (502) which are sequentially arranged along the positive direction of the optical axis;
The third lens (301), the fourth lens (302) and the fifth lens (401) all move along the optical axis.
2. An entrance pupil position pre-positioned large area array mid-wave infrared dual field optical system as claimed in claim 1, characterized in that the first lens (201), the third lens (301), the fifth lens (401) and the seventh lens (502) are all made of silicon material, and the second lens (202), the fourth lens (302) and the sixth lens (501) are all made of germanium material.
3. An entrance pupil position pre-positioned large area array mid-wave infrared dual field optical system as claimed in claim 1, characterized in that the first lens (201) is a spherical lens, and the front and rear surfaces of the first lens (201) are both spherical surfaces;
the second lens (202) is a spherical lens, and both the front and rear surfaces of the second lens (202) are spherical surfaces.
4. An entrance pupil position pre-arranged large area array mid-wave infrared dual field optical system according to claim 1, characterized in that the third lens (301) is a meniscus aspherical lens, the front surface of the third lens (301) is an aspherical surface, the rear surface of the third lens (301) is a spherical surface;
The fourth lens (302) is a meniscus aspherical lens, the front surface of the fourth lens (302) is an aspherical surface, and the rear surface of the fourth lens (302) is a spherical surface.
5. An entrance pupil position pre-arranged large area array mid-wave infrared dual field optical system as claimed in claim 1, characterized in that the fifth lens (401) is a meniscus aspherical lens, the front surface of the fifth lens (401) is an aspherical surface, and the rear surface of the fifth lens (401) is a spherical surface.
6. An entrance pupil position pre-arranged large area array mid-wave infrared dual field optical system according to claim 1, characterized in that the sixth lens (501) is a meniscus aspherical lens, the front surface of the sixth lens (501) is an aspherical surface, and the rear surface of the sixth lens (501) is a spherical surface;
The seventh lens (502) is a biconvex spherical lens, and the front and rear surfaces of the seventh lens (502) are both convex spherical surfaces.
7. An entrance pupil position pre-positioned large area array mid-wave infrared dual field optical system as defined in claim 1, characterized in that a plane mirror is arranged between the front fixed lens group (2) and the variable magnification lens group (3).
8. The entrance pupil position pre-positioned large area array medium wave infrared double-view optical system according to claim 1, wherein a plane reflecting mirror is arranged between the variable magnification lens group (3) and the compensating lens group (4).
9. A tele optical system, characterized in that the tele optical system comprises the entrance pupil position pre-positioned large area array mid-wave infrared dual-field optical system and the afocal optical system according to any one of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322978825.8U CN221426937U (en) | 2023-11-03 | 2023-11-03 | Entrance pupil position preposed large-area array medium-wave infrared double-view-field optical system and long-focus optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322978825.8U CN221426937U (en) | 2023-11-03 | 2023-11-03 | Entrance pupil position preposed large-area array medium-wave infrared double-view-field optical system and long-focus optical system |
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| CN221426937U true CN221426937U (en) | 2024-07-26 |
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