An optical splicing system with an integrated design of a light wedge and an imaging lens

Abstract

The present invention discloses an optical splicing system with an integrated design of a prism wedge and an imaging lens, comprising: a main optical imaging lens, a prism wedge assembly, and a splicing detector assembly; wherein, the prism wedge assembly is disposed between the splicing detector assembly and the main optical imaging lens; the prism wedge assembly is formed by splicing a plurality of obliquely arranged wedge plates; the main optical imaging lens receives the optical information of a large field of view scene, and performs aberration correction on the optical information of the large field of view scene to obtain a corrected imaging field of view; the prism wedge assembly divides the corrected imaging field of view into a plurality of sub-fields of view in an inclined plane; wherein, the distance between two adjacent sub-fields of view is greater than the width of the non-photosensitive regions of two adjacent image sensors in the splicing detector assembly; the splicing detector assembly acquires the entire image by collecting a plurality of sub-fields of view. The present invention has the advantages of simple implementation, low cost, small volume and weight, short required back working distance, and seamless coverage.

Description

Technical Field

[0001] The present invention belongs to the technical field of large field-of-view aerospace optoelectronic detection and remote sensing, and particularly relates to an optical splicing system with an integrated design of a prism and an imaging lens. Background Art

[0002] Image sensors, such as CCD, COMS, cooled or uncooled infrared detectors, are widely used in image acquisition fields and systems such as aerospace, aviation, ordinary digital cameras, and infrared imaging systems. Limited by factors such as the manufacturing process difficulty and high cost of large-scale image sensors, even if the optical system design can meet the index requirements of large field-of-view and high resolution, it is still difficult for a single detector to obtain a large amount of information. Therefore, facing the urgent needs of application fields such as aerospace remote sensing detection and large-scale wide-area search, large field-of-view or large-format digital imaging systems have become one of the important research directions in this field.

[0003] In the past, many researchers have proposed various solutions, mainly including scanning time-sharing imaging method, detector mechanical splicing method, multi-component imaging system splicing, and single-system optical splicing. However, for the scanning method, a scanning mirror with moving parts needs to be placed at the front or middle pupil position of the lens. Due to the presence of moving parts, the system reliability is reduced, and the detected area cannot be covered simultaneously, which is not suitable for applications with strict requirements for the moving field mirror or time resolution; for direct mechanical splicing, since there are non-imaging areas such as detector bases around the photosensitive area of the detector, it will cause blind spots due to the failure to capture effective imaging light information up and down or left and right; in addition, for the multi-system splicing method, multiple imaging lenses are used to form a system with a larger field of view, but this solution is costly, requires multiple groups of lenses, and the system structure is complex, with a large volume and high cost. The basic principle of single-system optical splicing is to use optical elements such as single mirrors, prism mirror combinations, and semi-transparent and semi-reflective mirrors to divide the field of view of the optical system into several parts, and image the sub-fields on their respective corresponding image sensors respectively, so that the assembly of the image sensor is not restricted by non-photosensitive areas, and finally the sub-fields are spliced together to achieve a seamless large field-of-view image. Optical splicing has the advantage of no physical seam and simple process, and is a common method for realizing large-scale focal planes, and is widely used in fields such as satellite remote sensing.

[0004] However, the existing optical splicing methods still have the following main deficiencies: ① For the semi-transparent and semi-reflective prism splicing method (such as CN101201459A), its splicing field of view is limited, and a longer back working distance is required. It is not suitable for splitting light in a smaller F# system. More importantly, the incident light beam needs to be split N times to reach the image plane, so that the light energy incident on the image plane is reduced to 2 of the original energy NOne over something, with insufficient energy, so its practicality in the field of aerospace remote sensing is not very strong. ② The total reflection and total transmission method using a reflector or a reflecting prism (CN 101650423B and CN101650423B). Due to the asymmetrical positions of the prisms for splitting light, the prism structure and splicing are complex. Splicing requires a complex mechanical structure for fixation and installation, with relatively large volume and weight, and cannot be used in lightweight designs. Moreover, in order to place the reflecting prism, a relatively large rear working distance needs to be reserved in the optical system, and it is also not suitable for splitting light in an optical system with a short rear working distance. Summary of the Invention

[0005] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, providing an optical splicing system with an integrated design of a wedge and an imaging lens, which has the advantages of simple implementation, low cost, small volume and weight, short required rear working distance, and seamless coverage.

[0006] The object of the present invention is achieved through the following technical solutions: An optical splicing system with an integrated design of a wedge and an imaging lens, comprising: a main optical imaging lens, a wedge combination, and a splicing detector assembly; wherein, the wedge combination is arranged between the splicing detector assembly and the main optical imaging lens; the wedge combination is spliced by a plurality of inclined wedge plates; the main optical imaging lens receives the light information of a large field of view scene, performs aberration correction on the light information of the large field of view scene to obtain a corrected imaging field of view; the wedge combination divides the corrected imaging field of view into multiple sub-fields in an inclined plane; wherein, the distance between two adjacent sub-fields is greater than the width of the non-photosensitive area between two adjacent image sensors in the splicing detector assembly; the splicing detector assembly obtains the entire image by collecting multiple sub-fields.

[0007] In the above optical splicing system with an integrated design of a wedge and an imaging lens, the splicing detector assembly includes a plurality of detectors; wherein, the plurality of detectors are spliced on a plane; each detector includes a photosensitive area and a non-photosensitive area substrate; wherein, the photosensitive area is arranged on the upper part of the non-photosensitive area substrate.

[0008] In the above optical splicing system with an integrated design of a wedge and an imaging lens, the main optical imaging lens includes an aperture stop, a primary mirror, a secondary mirror, and a tertiary mirror; wherein, the light information of the large field of view scene passes through the aperture stop and then enters the primary mirror, is reflected by the primary mirror and then reaches the secondary mirror, is reflected by the secondary mirror and then reaches the tertiary mirror, and then reaches the wedge combination through the tertiary mirror.

[0009] In the above optical splicing system with an integrated design of a wedge and an imaging lens, both the primary mirror and the tertiary mirror are high-order aspherical surfaces, and the secondary mirror is a quadratic surface.

[0010] In the above optical splicing system with an integrated design of the optical wedge and the imaging lens, the equation of the higher-order aspheric surface is as follows:

[0011]

[0012] Among them, c represents the curvature, which is the reciprocal of the vertex curvature radius, that is, 1 / R; k represents the quadratic aspheric coefficient, A represents the quartic aspheric coefficient, B represents the sextic aspheric coefficient, C represents the octic aspheric coefficient, D represents the decic aspheric coefficient; z represents the sagittal height, and h represents the distance from the point on the surface to the central axis of symmetry.

[0013] In the above optical splicing system with an integrated design of the optical wedge and the imaging lens, the distance between the aperture stop and the primary mirror is 710 mm to 730 mm, and the aperture of the aperture stop is 200 mm to 210 mm.

[0014] In the above optical splicing system with an integrated design of the optical wedge and the imaging lens, the curvature radius of the primary mirror is -2170 mm to -2180 mm, and the distance between the primary mirror and the secondary mirror is 540 mm to 550 mm.

[0015] In the above optical splicing system with an integrated design of the optical wedge and the imaging lens, the curvature radius of the secondary mirror is -720 mm to -730 mm, and the distance between the secondary mirror and the tertiary mirror is 710 mm to 720 mm.

[0016] In the above optical splicing system with an integrated design of the optical wedge and the imaging lens, the curvature radius of the tertiary mirror is -1050 mm to -1060 mm, and the distance between the tertiary mirror and the optical wedge combination is 730 mm to 740 mm.

[0017] In the above optical splicing system with an integrated design of the optical wedge and the imaging lens, the thickness of the optical wedge combination is 5 mm to 7 mm.

[0018] The present invention has the following beneficial effects compared with the prior art:

[0019] (1) The present invention coordinates aberration correction and balance between the imaging lens and the optical wedge combination, solving the problem of large aberrations introduced by the traditional transmission sub-field splicing method;

[0020] (2) In the design of the optical wedge transmission beam-splitting component of the present invention, the wedge angle is used as an optimization variable, greatly reducing the astigmatic aberration introduced by the tilt of the element and reducing the design difficulty of the main optical lens;

[0021] (3) The present invention only requires multiple tilted optical wedge combinations, with a simple structure, small weight and volume, and is suitable for lightweight design;

[0022] (4) The present invention requires a smaller working distance at the back, overcoming the drawback that the total reflection or semi-transmissive and semi-reflective spectroscopic prism method is not applicable to the optical splicing of optical systems with short working distances. It can be used for the optical splicing of optical systems with short working distances or small F# values.

[0023] (5) The splicing method of the present invention does not contain moving parts, there is no missing imaging field of view, and a large-scale area array focal plane is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0025] Figure 1 is a schematic diagram of the splicing detector assembly provided by an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the optical splicing system with an integrated design of a prism and an imaging lens provided by an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the main optical imaging lens provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the 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 so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0029] Figure 2 is a schematic diagram of the optical splicing system with an integrated design of a prism and an imaging lens provided by an embodiment of the present invention. As Figure 2 shown, the optical splicing system with an integrated design of a prism and an imaging lens includes: a main optical imaging lens 4, a prism combination 5, and a splicing detector assembly 6; wherein,

[0030] The prism combination 5 is disposed between the splicing detector assembly 6 and the main optical imaging lens 4; the prism combination 5 is formed by splicing a plurality of inclined wedge plates.

[0031] The main optical imaging lens 4 receives the optical information of the large field of view scene, and after correcting the aberration of the optical information of the large field of view scene, the corrected imaging field of view is obtained; the optical wedge combination 5 divides the corrected imaging field of view into multiple sub-fields in the inclined plane; wherein, the distance between two adjacent sub-fields is greater than the width of the non-photosensitive areas of two adjacent image sensors in the mosaic detector assembly 6. The mosaic detector assembly 6 obtains the entire image by collecting multiple sub-fields.

[0032] The wedge plate element placed obliquely in the optical path mainly functions to divide the imaging field of view into multiple sub-fields and simultaneously generate a lateral displacement between the sub-fields. The lateral displacement L is related to the principal ray angle I of the incident field of view c , the wedge plate tilt angle θ, the central thickness d, and the refractive index n of the wedge plate. The specific relationship is shown in the following formula (1);

[0033]

[0034] wherein, I' is the refraction angle of the front surface of the wedge plate, the incident angle I of the front surface of the wedge plate, the principal ray angle I of the incident field of view c and the wedge plate tilt angle θ, as shown in formula (2):

[0035] I = θ - I c (2)

[0036] On the other hand, inserting an inclined element in the converging optical path will introduce a large amount of astigmatism. The introduced aberration is related to the relative aperture F# of the front main optical lens, the tilt angle θ, the central thickness d, and the refractive index n. Here, a weak optical wedge is used instead of a parallel flat plate. There is a small wedge angle β between the front and back planes of the wedge plate to reduce the astigmatic aberration introduced by this element. Similarly, the selection of the size of the wedge angle β is complexly related to the F# of the main optical system, the tilt angle θ, the central thickness d, and the refractive index n. It needs to be specifically analyzed according to the actual situation. In the design, it is used as an optimization variable and co-designed with the main optics to seek the optimal solution.

[0037] Figure 1 is a schematic diagram of the mosaic detector assembly provided by an embodiment of the present invention. As Figure 1 shown, the mosaic detector assembly 6 includes a plurality of detectors; wherein, the plurality of detectors are mosaicked on one plane; each detector includes a photosensitive area 1 and a non-photosensitive area substrate 2; wherein, the photosensitive area 1 is arranged on the upper part of the non-photosensitive area substrate 2.

[0038] The main optical imaging lens is any large field of view optical imaging system that realizes a specific aperture and focal length, and is used to receive the optical information of the large field of view scene and correct the main aberration. Its structure can be in any form of optical system, such as all-reflective, all-refractive, refractive-reflective.

[0039] The optical wedge assembly is formed by splicing or gluing a number of inclined wedge plates and is placed in front of the image sensor. This wedge plate combination can split the light beam into sub-fields of view within an inclined plane of the imaging field of view. It causes the light rays in different fields of view to be deflected at different angles, and there is a certain distance between adjacent sub-fields of view. When this distance is greater than the width of the non-photosensitive area when two image sensors are placed closely together, each sub-field of view corresponds to an image sensor, and the entire image can be received by multiple image sensors. Spatially, the detectors are placed in parallel and approximately interfere complementarily on the same plane, making the system relatively compact.

[0040] The advantage of the optical wedge assembly compared to a flat plate is that it reduces the large astigmatic aberration caused by the inclined optical element. Each optical wedge has a certain wedge angle, within about 5°, between its front and rear surfaces, and the thickness of the optical wedge is basically the same. The inclination angle of the optical wedge is appropriately determined according to the distance that needs to separate the two sub-fields of view, and is taken within 30°.

[0041] The main optical imaging lens and the optical wedge assembly are integrally designed to meet the design requirements such as the distance required to separate the sub-fields of view and good imaging performance. The main optical imaging lens has large residual aberrations such as astigmatism and coma, which are complementary to the aberrations caused by the optical wedge assembly. During the design process, the wedge angle, inclination angle, and thickness of the optical wedge can all be optimized variables. Taking the separation distance of the sub-fields of view in the image plane and the position coordinates of the connection between adjacent wedge plates as constraint conditions, they are corrected synergistically with the residual aberrations of the main optical system for an integrated design of imaging and splicing.

[0042] The type of the photoelectric image sensor can be a CCD, a COMS, a cooled or uncooled infrared detector.

[0043] Since in the present invention, the wedge plates are installed at the position of the non-field stop, it will inevitably cause vignetting in some fields of view of the sub-image plane after splitting. However, this problem is a common problem existing in all optical splicing, and it can be compensated by the overlapping part of the sub-image plane. By eliminating vignetting and merging, a complete imaging field of view is formed, without blind spots, realizing seamless splicing.

[0044] The photoelectric image sensor is the core component in the optoelectronic system, which converts the optical signal carrying image information into an electrical signal. Usually, a photosensitive area is arranged on a relatively large substrate for one detector, and multiple detection substrates can be spliced one by one to achieve a larger scale of integration. Such as Figure 1As shown, taking the splicing of four detectors as an example, 1 is the photosensitive area, and 2 is the substrate, which is a non-photosensitive area. The photosensitive area is composed of pixels (picture elements) arranged in a dense row and column pattern, and the scale of the photosensitive surface pixels is limited by the manufacturing process. For example, the 1000×256SWIR HgCdTe focal plane detector produced by Sofradir in France uses photovoltaic HgCdTe and a COMS readout integrated circuit (ROIC), and the size of the detection element is 30um×30um. Figure 1 The edges of the substrates of each detector component are spliced on a plane to achieve a larger scale. Although splicing can achieve a large number of pixels, this method is limited by the non-photosensitive area substrate 2, and there is a non-photosensitive gap area 3 between two adjacent photosensitive areas 1. If the image is directly imaged onto the detector, some field-of-view information will not be acquired, resulting in a blind area. This embodiment proposes an optical splicing method with an integrated design of an optical wedge and an imaging lens, which solves the problem of blind areas or missing field-of-view of the seam caused by direct mechanical splicing. This method places multiple wedge plates at the front end of the detector to image the imaging light beam within the photosensitive area, avoiding the splicing gap; the structural parameters of the wedge plate are integrated with the imaging lens design to correct aberrations synergistically, and finally achieve seamless splicing of multiple detectors. As Figure 2 shown, it is a schematic diagram of the optical splicing with an integrated design of an optical wedge and an imaging lens proposed by the present invention. The entire optical system includes a main optical imaging lens 4, an optical wedge combination 5, and a spliced detector assembly 6.

[0045] The main optical imaging lens 4 is the main system for achieving specific optical performance indicators such as field of view, focal length, and F#, and can be any form of optical structure.

[0046] The optical wedge combination 5 is composed of several wedge plates placed obliquely and spliced or glued together, and is placed in front of the image sensor. Figure 2 The schematic diagram takes the splicing of two optical wedges as an example, which are the upper optical wedge 5a and the lower optical wedge 5b respectively. The light rays ( Figure 2 solid lines in the figure) in the upper sub-field of view will be translated upward by a certain distance after passing through the upper optical wedge 5a, so the image point will also be translated upward by a certain distance, and the imaging light is received by the photosensitive area 1a of the upper detector; while the light rays ( Figure 2 dashed lines in the figure) in the lower sub-field of view, after passing through the lower optical wedge 5b, the image point will be translated downward, and the imaging light is received by the photosensitive area 1b of the lower detector. Therefore, the two sub-fields of view are separated by a certain distance. When this distance is greater than the non-photosensitive gap area 3 ( Figure 1 ) when two image sensors are placed close together, the entire image can be received by the image sensor 6. Among them, the width between the photosensitive area 1a of the upper detector and the photosensitive area 1b of the lower detector is the Figure 1 non-photosensitive gap area 3 in the figure. Different detector structures have different gap widths.

[0047] The main optical imaging lens 4 and the optical wedge assembly 5 are integrally designed to meet the design requirements such as the required separation distance for the sub - field of view and good imaging performance. The main optical imaging lens has large residual aberrations such as astigmatism and coma, which are complementary to the aberrations caused by the optical wedge assembly. During the design process, the wedge angle, tilt angle, and thickness of the optical wedge can all be optimized variables. Taking the separation distance of the sub - field of view in the image plane and the position coordinates of the connection points of adjacent wedge plates as constraints, they are corrected synergistically with the residual aberrations of the main optical system for an integrated design of imaging and stitching. The type of the optoelectronic image sensor 6 can be a CCD, COMS, cooled or uncooled infrared detector. Spatially, each detector is placed in parallel and interferes complementarily on approximately the same plane, making the system relatively compact.

[0048] Here, in combination with a specific embodiment, the stitching design method of the present invention is further described.

[0049] One embodiment of the present invention is as follows: the entrance pupil diameter is 205 mm, the field of view reaches 10.2°×3.2°, the working spectral band is 2.8 μm - 5.5 μm, and the F - number is 4.4. The system adopts a 1×2 stitching method, dividing the 10.2°×3.2° field of view into two sub - fields of 5.1×3.2°. The three - dimensional optical system structure is as Figure 3 shown. The main optical system of this system is an off - axis three - mirror system, realizing the design of a large - field - of - view long - focal - length system, which is composed of an aperture stop, a primary mirror, a secondary mirror, a tertiary mirror, an optical wedge combination, and an image plane.

[0050] The structural parameters of the optical system are shown in Table 1. The primary mirror and the tertiary mirror are high - order aspheres, the secondary mirror is a conic surface, and its aspheric parameters are listed in Table 2. The adopted aspheric equation is:

[0051]

[0052] Among them, c represents the curvature, which is the reciprocal of the vertex curvature radius, that is, 1 / R; k represents the quadratic aspheric coefficient, A represents the quartic aspheric coefficient, B represents the sextic aspheric coefficient, C represents the octic aspheric coefficient, D represents the decic aspheric coefficient; z represents the sagittal height, and h represents the distance from the point on the surface to the central axis of symmetry. The tilt angle of the front surface of the optical wedge is 19.97°, the tilt angle of the rear surface is 20.09°, and the wedge angle is 0.12°. The upper optical wedge is eccentric - 48 mm along the long - field - of - view direction (10.2° field - of - view direction), the lower optical wedge is eccentric 48 mm along the long - direction field of view, the thickness of the two wedge plates is 5 mm, and the aperture is 98×70.1 mm.

[0053] Finally, through the integrated optimization design of the combination of the main optical lens and the optical wedge, various optical indexes and image quality requirements are achieved. The length of the non-photosensitive gap area in the middle of the detector reaches 4.5 mm, which matches the corresponding detector substrate gap. The MTF curve after optical splicing in the embodiment of the present invention has approached the diffraction limit.

[0054] Table 1 Optical system structure parameter table

[0055]

[0056] Table 2 Aspheric coefficient parameter table

[0057] CURV K A B C D A(1) -1.6096 7.22E-13 -3.78E-17 2.58E-22 -6.59E-28 -1.6096007 A(2) 0.60640 A(3) -3.1209 -3.49E-10 1.33E-16 -2.48E-22 6.72E-29 ——

[0058] The present invention is applicable to the splicing of area arrays and line arrays, and the spectral band is not restricted.

[0059] The present invention corrects and balances the imaging lens and the beam splitting component for aberration synergistically, and solves the problem of large aberration introduced by the traditional transmissive sub-field splicing method.

[0060] In the design of the optical wedge transmissive beam splitting component proposed by the present invention, the wedge angle is used as an optimization variable, which greatly reduces the astigmatism aberration introduced by the tilt of the element and reduces the design difficulty of the main optical lens.

[0061] The present invention only requires the combination of multiple inclined optical wedges, with a simple structure, small weight and volume, and is suitable for lightweight design; the present invention requires a small back working distance, overcoming the disadvantage that the total reflection or semi-transmissive and semi-reflective beam splitting prism method is not applicable to the optical splicing of optical systems with short working distances. It can be used for the optical splicing of optical systems with short working distances or small F#; the present invention has almost little loss of light energy and sufficient energy, and can be applied to systems with large requirements for system transmittance and energy, such as the field of aerospace remote sensing; the splicing method of the present invention does not contain moving parts, there is no missing imaging field of view, and a large-scale area array focal plane is realized. It is suitable for imaging systems with large fields of view, high spatial resolutions, and high temporal resolutions, such as satellite remote sensing, aerial photography of aircraft, infrared detection and early warning, etc.

[0062] Although the present invention has been disclosed above with preferred embodiments, it is not used to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention all belong to the protection scope of the technical solution of the present invention.

Claims

1. An optical splicing system with an integrated design of a light wedge and an imaging lens, characterized in that Comprising: A main optical imaging lens (4), a wedge combination (5), and a stitching detector assembly (6); wherein, The wedge combination (5) is disposed between the stitching detector assembly (6) and the main optical imaging lens (4); The wedge combination (5) is formed by splicing a plurality of obliquely placed wedge plates; The main optical imaging lens (4) receives the light information of a large field of view scene, performs aberration correction on the light information of the large field of view scene to obtain a corrected imaging field of view; the wedge combination (5) divides the corrected imaging field of view into a plurality of sub-fields in an inclined plane; wherein, the distance between two adjacent sub-fields is greater than the width of the non-photosensitive regions of two adjacent image sensors in the stitching detector assembly (6); The stitching detector assembly (6) obtains the entire image by collecting a plurality of sub-fields.

2. The optical splicing system with an integrated design of a prism and an imaging lens according to claim 1, characterized in that: The stitching detector assembly (6) includes a plurality of detectors; wherein, The plurality of detectors are stitched together on a plane; Each detector includes a photosensitive region (1) and a non-photosensitive region substrate (2); wherein, the photosensitive region (1) is disposed on the upper part of the non-photosensitive region substrate (2).

3. The optical splicing system with an integrated design of a light wedge and an imaging lens according to claim 1, characterized in that: The main optical imaging lens (4) includes an aperture stop, a primary mirror, a secondary mirror, and a tertiary mirror; wherein, The light information of the large field of view scene enters the primary mirror after passing through the aperture stop, then reaches the secondary mirror after being reflected by the primary mirror, then reaches the tertiary mirror after being reflected by the secondary mirror, and then reaches the wedge combination (5) after passing through the tertiary mirror.

4. The optical splicing system with an integrated design of a prism and an imaging lens according to claim 3, characterized in that: Both the primary mirror and the tertiary mirror are high-order aspherical surfaces, and the secondary mirror is a quadratic surface.

5. The optical splicing system with integrated design of a prism and an imaging lens according to claim 4, characterized in that: The high-order aspherical equation is: Wherein, c represents the curvature, which is the reciprocal of the vertex curvature radius, i.e., 1 / R; k represents the quadratic aspherical coefficient, A represents the quartic aspherical coefficient, B represents the sixth-order aspherical coefficient, C represents the eighth-order aspherical coefficient, D represents the tenth-order aspherical coefficient; z represents the sagitta, and h represents the distance from a point on the surface to the central axis of symmetry.

6. The optical splicing system with an integrated design of a light wedge and an imaging lens according to claim 3, characterized in that: The distance between the aperture stop and the primary mirror is 710 mm to 730 mm, and the aperture of the aperture stop is 200 mm to 210 mm.

7. The optical splicing system with integrated design of the optical wedge and the imaging lens according to claim 3, wherein: The curvature radius of the primary mirror is -2170 mm to -2180 mm, and the distance between the primary mirror and the secondary mirror is 540 mm to 550 mm.

8. The optical splicing system with integrated design of a light wedge and an imaging lens according to claim 3, characterized in that: The curvature radius of the secondary mirror is -720 mm to -730 mm, and the distance between the secondary mirror and the tertiary mirror is 710 mm to 720 mm.

9. The optical splicing system with integrated design of a prism and an imaging lens according to claim 3, wherein: The curvature radius of the tertiary mirror is -1050 mm to -1060 mm, and the distance between the tertiary mirror and the wedge combination (5) is 730 mm to 740 mm.

10. The optical splicing system with an integrated design of a prism and an imaging lens according to claim 3, characterized in that: The thickness of the wedge combination (5) is 5 mm to 7 mm.

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