Coaxial multi-band reflective derotation optical system

Abstract

The present invention discloses a coaxial multi-band reflective derotation optical system, which comprises: a scanning component; an imaging component, the imaging component and the scanning component are arranged at intervals along a first direction; a reflecting component, the reflecting component is rotatably arranged between the scanning component and the imaging component; the light is incident on the reflecting component after passing through the scanning component, and the light is incident on the imaging component after being reflected multiple times in the reflecting component. By adopting the present invention, the reflecting component is used to reflect the light multiple times to realize the derotation function, which not only makes the derotation optical system suitable for multi-band light, but also ensures the optical performance and high-quality image quality of the derotation optical system.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to a coaxial multi-band reflective derotation optical system. Background Art

[0002] In the related art, scanning using a 45° rotating scanning reflector has become a common optical mechanical scanning mode due to its own advantages, and is widely used in the fields of search and tracking systems, large-scale spatial scanning imaging systems, etc. However, this scanning method usually causes the vertical line of the object space and the detector to have a changing angle during the rotation scanning process, that is, the imaging plane on the detector will rotate with the optical axis as the rotation axis during scanning, so it is necessary to use a derotation device to improve it.

[0003] Image derotation is usually achieved through the following two methods: first, direct image derotation using a special image derotation optical system, known as optical image derotation; second, image derotation using image processing in the later stage of system imaging, known as electronic image derotation. Since electronic image derotation has defects such as complex procedures, image data deformation, and long delay time in actual use, optical image derotation is still a more common image derotation method in engineering applications.

[0004] Commonly used optical de-rotation devices include Dove prism and K mirror. Among them, the design principle of Dove prism is simple, but it cannot be used in multiple bands due to the characteristics of its own materials, and its size is generally large, which brings difficulties and problems to motor selection and system load. The K mirror is composed of three full-reflection mirrors, and is named because its three mirrors are arranged in the shape of a K. It is difficult to determine its rotation radius and length. At the same time, the integrity of the K mirror is poor, and there are technical difficulties in the installation and adjustment accuracy. In addition, these two de-rotation devices do not have real entrance pupils and real exit pupils during use, which also brings certain difficulties to the system installation and adjustment. Summary of the invention

[0005] The embodiment of the present invention provides a coaxial multi-band reflective derotation optical system, which is used to solve the problem that the derotation device in the prior art is not suitable for the multi-band optical system and is difficult to process and assemble.

[0006] The embodiment of the present invention provides a coaxial multi-band reflective derotation optical system, comprising:

[0007] Scanned copy;

[0008] An imaging component, wherein the imaging component and the scanning component are spaced apart along a first direction;

[0009] A reflection component, wherein the reflection component is rotatably disposed between the scanning component and the imaging component;

[0010] The light is incident on the reflection component after passing through the scanning component, and the light is incident on the imaging component after being reflected multiple times in the reflection component.

[0011] According to some embodiments of the present invention, the reflective component comprises:

[0012] First plane mirror;

[0013] a second plane mirror, the second plane mirror and the first plane mirror are spaced apart from each other along the first direction;

[0014] An image derotation device, the image derotation device is located between the first plane mirror and the second plane mirror, the image derotation device comprises a first reflector and a second reflector that are arranged opposite to each other and spaced apart along a second direction, the second direction being perpendicular to the first direction;

[0015] The light is reflected by the first plane mirror and then incident on the derotation device. The light is reflected multiple times between the first reflector and the second reflector and then incident on the second plane mirror.

[0016] In some embodiments of the present invention, the first reflector includes a first reflective surface, a second reflective surface, and a third reflective surface sequentially arranged along the first direction;

[0017] The second reflector comprises a fourth reflective surface and a fifth reflective surface sequentially arranged along the first direction;

[0018] The light is reflected from the first reflection surface to the fourth reflection surface, the light is reflected from the fourth reflection surface to the second reflection surface, the light is reflected from the second reflection surface to the fifth reflection surface, and the light is reflected from the fifth reflection surface to the third reflection surface.

[0019] In some examples of the present invention, the first reflecting surface, the second reflecting surface, and the third reflecting surface are all concave reflecting surfaces, and the first reflecting surface and the third reflecting surface have the same shape.

[0020] In some examples of the present invention, the fourth reflective surface and the fifth reflective surface have the same shape and are both convex reflective surfaces.

[0021] In some embodiments of the present invention, the first reflector and the second reflector are coaxially arranged.

[0022] In some embodiments of the present invention, a line connecting the center of the first plane mirror and the center of the second plane mirror is parallel to the first direction.

[0023] In some embodiments of the present invention, the center of the scanning piece, the center of the first plane mirror, and the center of the second plane mirror are collinear and parallel to the first direction.

[0024] According to some embodiments of the present invention, a rotation axis of the reflective component is parallel to the first direction.

[0025] According to some embodiments of the present invention, the scanning part includes a 45° rotating scanning mirror.

[0026] The coaxial multi-band reflective derotation optical system of the embodiment of the present invention utilizes a reflective component to reflect light multiple times to achieve the derotation function, which not only makes the derotation optical system suitable for multi-band light, but also ensures the optical performance and high-quality image quality of the derotation optical system.

[0027] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0029] Figure 1 is a schematic structural diagram of a coaxial multi-band reflective derotation optical system in an embodiment of the present invention;

[0030] Figure 2 It is a schematic structural diagram of a coaxial multi-band reflective derotation optical system in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0032] like Figure 2As shown, an embodiment of the present invention proposes a coaxial multi-band reflective derotation optical system 1, comprising: a scanner 10, an imaging component 20 and a reflection component 30. The imaging component 20 and the scanner 10 are arranged at intervals along a first direction. The reflection component 30 is rotatably arranged between the scanner 10 and the imaging component 20. It can be understood that the reflection component 30 is located between the scanner 10 and the imaging component 20, and the "reflection component 30 is located between the scanner 10 and the imaging component 20" here can be understood as that the light after the action of the scanner 10 needs to enter the imaging component 20 after the action of the reflection component 30. The scanner 10 and the imaging component 20 are relatively stationary, and the reflection component 30 is movable relative to the scanner 10.

[0033] It should be noted that the "coaxial multi-band reflective derotation optical system 1" mentioned here can be understood as the reflective derotation optical system 1 can have multiple (two or more) bands of light, and it can be understood that the reflective component 30 in the reflective derotation optical system 1 can perform derotation operations on multiple bands of light. For example, the reflective component 30 in the reflective derotation optical system 1 can perform derotation operations on three bands: mid-wave infrared, long-wave infrared, and laser.

[0034] The light is incident on the reflection component 30 after passing through the scanning element 10 . The light is incident on the imaging component 20 after being reflected multiple times in the reflection component 30 .

[0035] The coaxial multi-band reflective derotation optical system 1 of the embodiment of the present invention is adopted. By setting a reflection component 30, the reflection component 30 is used to reflect the light multiple times to achieve the derotation function. This not only makes the derotation optical system 1 suitable for multi-band light, but also ensures the optical performance and high image quality of the derotation optical system 1.

[0036] On the basis of the above-mentioned embodiments, various variant embodiments are further proposed. It should be noted that, in order to make the description concise, only the differences from the above-mentioned embodiments are described in each variant embodiment.

[0037] like Figure 1 and Figure 2As shown, according to some embodiments of the present invention, the reflection assembly 30 includes: a first plane mirror 31, a second plane mirror 32 and an image derotation device 33. Among them, the second plane mirror 32 and the first plane mirror 31 are spaced apart along the first direction. The image derotation device 33 is located between the first plane mirror 31 and the second plane mirror 32. Here, "the image derotation device 33 is located between the first plane mirror 31 and the second plane mirror 32" can be understood as the light reflected by the first plane mirror 31 needs to be incident on the second plane mirror 32 after passing through the action of the image derotation device 33. The image derotation device 33 includes a first reflector 330 and a second reflector 340 that are opposite to each other and spaced apart along a second direction, and the second direction is perpendicular to the first direction. For example, the first direction can be a vertical direction, and the second direction can be a horizontal direction.

[0038] The light is reflected by the first plane mirror 31 and then incident on the derotation device 33 . The light is reflected multiple times between the first reflector 330 and the second reflector 340 and then incident on the second plane mirror 32 .

[0039] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the first reflector 330 includes a first reflective surface 331, a second reflective surface 332, and a third reflective surface 333 arranged in sequence along the first direction. The second reflector 340 includes a fourth reflective surface 341 and a fifth reflective surface 342 arranged in sequence along the first direction. For example, the first reflective surface 331, the second reflective surface 332, and the third reflective surface 333 may be arranged in sequence at intervals. The fourth reflective surface 341 and the fifth reflective surface 342 may be arranged in sequence at intervals. The first reflective surface 331, the second reflective surface 332, and the third reflective surface 333 are all located on the side of the first reflector 330 facing the second reflector 340, and the fourth reflective surface 341 and the fifth reflective surface 342 are all located on the side of the second reflector 340 facing the first reflector 330.

[0040] The light is reflected from the first reflection surface 331 to the fourth reflection surface 341 , from the fourth reflection surface 341 to the second reflection surface 332 , from the second reflection surface 332 to the fifth reflection surface 342 , and from the fifth reflection surface 342 to the third reflection surface 333 .

[0041] Therefore, the structure of the reflective component 30 can be simplified, the difficulty of processing and assembling the reflective component 30 can be reduced, and the engineering requirements of the optical system can be better met.

[0042] like Figure 1 and Figure 2As shown, in some examples of the present invention, the first reflection surface 331, the second reflection surface 332, and the third reflection surface 333 are all concave reflection surfaces, and the first reflection surface 331 and the third reflection surface 333 have the same shape. As a result, the processing difficulty of the first reflector 330 can be reduced. Further, in the direction from one end of the first reflection surface 331 close to the second reflection surface 332 to the other end (from the lower end to the upper end), the first reflection surface 331 is tilted toward the second reflector 340. In the direction from one end of the third reflection surface 333 close to the second reflection surface 332 to the other end (from the upper end to the lower end), the third reflection surface 333 is tilted toward the second reflector 340. From the center to the edge of the second reflection surface 332, the second reflection surface 332 is tilted toward the second reflector 340.

[0043] like Figure 1 and Figure 2 As shown, in some examples of the present invention, the fourth reflection surface 341 and the fifth reflection surface 342 have the same shape and are both convex reflection surfaces. As a result, the processing difficulty of the second reflection mirror 340 can be reduced. Further, from one end of the fourth reflection surface 341 close to the fifth reflection surface 342 to the other end (from the lower end to the upper end), the fourth reflection surface 341 is inclined in a direction away from the first reflection mirror 330. From one end of the fifth reflection surface 342 close to the fourth reflection surface 341 to the other end (from the upper end to the lower end), the fifth reflection surface 342 is inclined in a direction away from the first reflection mirror 330.

[0044] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the first reflector 330 and the second reflector 340 are coaxially arranged. It can be understood that the central axis of the first reflector 330 is colinear with the central axis of the second reflector 340. Thus, the difficulty of processing and adjusting the reflective assembly 30 can be reduced.

[0045] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the line connecting the center of the first plane mirror 31 and the center of the second plane mirror 32 is parallel to the first direction. Thus, the difficulty of assembling and adjusting the reflective assembly 30 can be reduced.

[0046] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the center of the scanning element 10, the center of the first plane mirror 31, and the center of the second plane mirror 32 are collinear and parallel to the first direction. Thus, the difficulty of assembling and adjusting the coaxial multi-band reflective derotation optical system 1 can be reduced.

[0047] According to some embodiments of the present invention, the rotation axis of the reflective component 30 is parallel to the first direction. Thus, the reflective component 30 can realize the derotation function of the search and tracking system and the spatial large-range scanning imaging system.

[0048] According to some embodiments of the present invention, the scanner 10 includes a 45° rotating scanning mirror.

[0049] Refer to the following Figure 1-2 The coaxial multi-band reflective derotation optical system 1 according to the embodiment of the present invention is described in detail with two specific embodiments. It is worth noting that the following description is only an exemplary description and not a specific limitation of the present invention. All similar structures and similar variations of the present invention should be included in the protection scope of the present invention.

[0050] Embodiment 1

[0051] like Figure 2 As shown, the coaxial multi-band reflective derotation optical system 1 according to an embodiment of the present invention comprises: a scanning component 10 , an imaging component 20 and a reflective component 30 .

[0052] Specifically, if Figure 2 As shown, the scanning part 10 is a 45° rotating scanning reflector. The 45° rotating scanning reflector is tilted, and the lower end of the 45° rotating scanning reflector is located on the right side of its upper end. The imaging component 20 is located below the scanning part 10. The reflection component 30 is located between the scanning part 10 and the imaging component 20. The scanning part 10 and the imaging component 20 are relatively stationary, and the reflection component 30 is movable relative to the scanning part 10. When the scanning system performs scanning rotation, the reflection component 30 rotates around the axis in the opposite direction at a rate of 1 / 2.

[0053] like Figure 2 As shown, the reflection assembly 30 includes: a first plane mirror 31, a second plane mirror 32 and an image derotation device 33. The first plane mirror 31 is located directly below the scanning piece 10, and the second plane mirror 32 is located directly below the first plane mirror 31. In other words, the center of the first plane mirror 31, the center of the second plane mirror 32 and the center of the scanning piece 10 are collinear, and the line connecting the center of the first plane mirror 31 and the center of the second plane mirror 32 is parallel to the vertical direction. The first plane mirror 31 and the scanning piece 10 can be arranged in parallel. The first plane mirror 31 and the second plane mirror 32 have the same shape and size. In the direction from the right end of the second plane mirror 32 to the left end of the second plane mirror 32, the second plane mirror 32 is tilted in a direction gradually away from the first plane mirror 31.

[0054] like Figure 2As shown, the derotation device 33 includes a second reflector 340 and a first reflector 330 arranged in a left-right direction. The first reflector 330 is coaxially arranged with the second reflector 340, and the first reflector 330 is located on the right side of the second reflector 340. The second reflector 340 can be arranged between the right end of the first plane mirror 31 and the right end of the second plane mirror 32.

[0055] like Figure 2 As shown, the first reflector 330 includes a first reflective surface 331, a second reflective surface 332, and a third reflective surface 333, which are arranged toward the second reflector 340 and are arranged in sequence in the vertical direction. The first reflective surface 331, the second reflective surface 332, and the third reflective surface 333 are all concave reflective surfaces, and the first reflective surface 331 and the third reflective surface 333 have the same shape. In the direction from one end of the first reflective surface 331 close to the second reflective surface 332 to the other end, the first reflective surface 331 is tilted toward the second reflector 340. In the direction from one end of the third reflective surface 333 close to the second reflective surface 332 to the other end, the third reflective surface 333 is tilted toward the second reflector 340. The first reflective surface 331 and the third reflective surface 333 are symmetrical about the rotational symmetry axis of the second reflective surface 332.

[0056] like Figure 2 As shown, the second reflector 340 includes a fourth reflective surface 341 and a fifth reflective surface 342 which are arranged toward the first reflector 330 and are arranged in sequence along the vertical direction. The fourth reflective surface 341 and the fifth reflective surface 342 have the same shape and are both convex reflective surfaces. In the direction from one end of the fourth reflective surface 341 close to the fifth reflective surface 342 to the other end, the first reflective surface 331 is inclined in the direction away from the first reflector 330. In the direction from one end of the fifth reflective surface 342 close to the fourth reflective surface 341 to the other end, the fifth reflective surface 342 is inclined in the direction away from the first reflector 330. The fourth reflective surface 341 and the fifth reflective surface 342 are symmetrical about the rotational symmetry axis of the second reflective surface 332.

[0057] The entrance pupil and exit pupil of the derotation device 33 are located at the first plane mirror 31 and the second plane mirror 32 respectively, and the imaging magnification is 1:1. For the multi-band search and imaging optical system, the advantage of setting the real entrance pupil and real exit pupil is that the derotation device 33 as a component can be detected separately, and it is convenient for the installation and adjustment of the whole system, reducing the difficulty of installation and adjustment. The entrance pupil diameter of the derotation device 33 is 45mm, and the optical rotation radius of the derotation device 33 is 130mm.

[0058] like Figure 2As shown, the imaging assembly 20 includes a first imaging reflector 21 and a first imaging lens 22. The first imaging lens 22 is located directly below the second plane mirror 32. In other words, the line connecting the center of the first imaging lens 22 and the center of the second plane mirror 32 is parallel to the vertical direction. The line connecting the center of the first imaging reflector 21 and the center of the first imaging lens 22 is parallel to the horizontal direction, and the first imaging reflector 21 is located on the left side of the first imaging lens 22. The focal length of the imaging assembly 20 is 130 mm, and the F number is 2.67.

[0059] The light starting with the radiation energy of the target scene is incident on the first plane mirror 31 as parallel light after being reflected by the 45° rotating scanning reflector. After being reflected by the first plane mirror 31, the parallel light path is folded and incident on the first reflecting surface 331 of the first reflector 330. After being reflected by the first reflecting surface 331, it is incident on the fourth reflecting surface 341. After being reflected by the fourth reflecting surface 341, it is incident on the second reflecting surface 332. After being reflected by the second reflecting surface 332, it is incident on the fifth reflecting surface 342. After being reflected by the fifth reflecting surface 342, it is incident on the third reflecting surface 333. After being reflected by the third reflecting surface 333, it is incident on the second plane mirror 32 as parallel light, and the second plane mirror 32 folds the parallel light to the first imaging lens 22. After being acted on by the first imaging lens 22, part of the light is reflected to the first imaging reflector 21, and the other part of the light passes through the first imaging lens 22. The optical axes of the light beam incident on the first plane mirror 31 and the light beam emitted from the second plane mirror 32 are consistent, and the mechanical rotation axis of the reflection component 30 is also consistent with the optical axes of the two light beams.

[0060] It should be noted that the light starting with the radiation energy of the target scene may include medium-wave infrared, long-wave infrared and laser, wherein the wavelength of the medium-wave infrared is between 3.7 and 4.8 μm, and the wavelength of the long-wave infrared is between 7.7 and 10.3 μm.

[0061] In the embodiment of the present invention, only two optical focal length components, namely the first reflector 330 and the second reflector 340, are used, which reduces the difficulty of processing, and the first reflector 330 and the second reflector 340 are coaxially placed, which reduces the difficulty of assembling and adjusting the reflective assembly 30 to a certain extent. Moreover, under the premise of adapting to multiple bands and ensuring the optical performance and high-quality image quality of the system, the image derotation function of the large-scale search tracking and scanning imaging optical system is realized, thereby solving the defects of the traditional image derotation device 33 that cannot meet the requirements of multi-band use and has poor engineering adaptability.

[0062] Embodiment 2

[0063] Different from the first embodiment, in the second embodiment, Figure 1As shown, the imaging assembly 20 includes a second imaging reflector 23 and a second imaging lens 24. The second imaging reflector 23 is located directly below the second plane mirror 32. In other words, the line connecting the center of the second imaging reflector 23 and the center of the second plane mirror 32 is parallel to the vertical direction. The line connecting the center of the second imaging reflector 23 and the center of the second imaging lens 24 is parallel to the horizontal direction, and the second imaging lens 24 is located on the right side of the second imaging reflector 23. The second plane mirror 32 deflects the parallel light to the second imaging reflector 23, and after being reflected by the second imaging reflector 23, it enters the second imaging lens 24 and passes through the second imaging lens 24.

[0064] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0065] In addition, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0066] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A coaxial multi-band reflective derotation optical system, characterized in that: include: Scanned copy; An imaging component, wherein the imaging component and the scanning component are spaced apart along a first direction; A reflection component, wherein the reflection component is rotatably disposed between the scanning component and the imaging component; The light is incident on the reflection component after passing through the scanning component, and the light is incident on the imaging component after being reflected multiple times in the reflection component; Wherein, the reflective component comprises: First plane mirror; a second plane mirror, the second plane mirror and the first plane mirror are spaced apart from each other along the first direction; An image derotation device, the image derotation device is located between the first plane mirror and the second plane mirror, the image derotation device comprises a first reflector and a second reflector that are arranged opposite to each other and spaced apart along a second direction, the second direction being perpendicular to the first direction; The light is reflected by the first plane mirror and then incident on the derotation device, and the light is reflected multiple times between the first reflector and the second reflector and then incident on the second plane mirror; Wherein, the first reflector and the second reflector are coaxially arranged; Wherein, the first reflector comprises a first reflective surface, a second reflective surface and a third reflective surface sequentially arranged along the first direction; The second reflector comprises a fourth reflective surface and a fifth reflective surface sequentially arranged along the first direction; The light is reflected from the first reflection surface to the fourth reflection surface, the light is reflected from the fourth reflection surface to the second reflection surface, the light is reflected from the second reflection surface to the fifth reflection surface, and the light is reflected from the fifth reflection surface to the third reflection surface; Wherein, the first reflecting surface, the second reflecting surface, and the third reflecting surface are all concave reflecting surfaces, and the first reflecting surface and the third reflecting surface have the same shape; The fourth reflecting surface and the fifth reflecting surface have the same shape and are both convex reflecting surfaces.

2. The coaxial multi-band reflective derotation optical system according to claim 1, characterized in that: A line connecting the center of the first plane mirror and the center of the second plane mirror is parallel to the first direction.

3. The coaxial multi-band reflective derotation optical system according to claim 2, wherein: The center of the scanning part, the center of the first plane mirror, and the center of the second plane mirror are collinear and parallel to the first direction.

4. The coaxial multi-band reflective derotation optical system according to claim 1, wherein: The rotation axis of the reflective component is parallel to the first direction.

5. The coaxial multi-band reflective derotation optical system according to claim 1, wherein: The scanning part includes a 45° rotating scanning reflector.

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