Primary and secondary mirror optical system with quantitative adjustment function and adjustment method thereof

Abstract

The application discloses a primary and secondary mirror optical system with quantitative adjustment function and an adjustment method thereof, and solves the problem that the relative position adjustment of the primary and secondary mirrors cannot be quantitatively controlled and the adjustment precision is difficult to control. Specifically, the primary and secondary mirror optical system comprises a primary mirror, a secondary mirror, a primary mirror barrel, a secondary mirror frame and N cams, wherein N is an integer greater than or equal to 3; the primary mirror is installed in the primary mirror barrel; the side wall of the primary mirror barrel is externally provided with N lugs, and the center thereof is provided with a light transmission hole matched with the center hole of the primary mirror; the secondary mirror frame comprises a first ring and a second ring coaxially and parallelly arranged; the first ring is movably connected with the end face of the primary mirror barrel provided with the lug in a surface contact mode; the lug protrudes from the outer wall of the first ring; the secondary mirror is installed in the second ring; the cam is disc-shaped, and the outer circular contour line thereof is an Archimedes spiral; the N cams are rotatably connected with the N lugs respectively, and the side wall of each cam abuts against the side wall of the first ring, so as to adjust the position of the first ring on the end face of the primary mirror barrel through rotation.

Description

Technical Field

[0001] This invention relates to a primary and secondary mirror optical system and its adjustment method, specifically to a primary and secondary mirror optical system and its adjustment method with quantitative adjustment function. Background Technology

[0002] In common optical systems, primary and secondary mirrors are crucial components affecting system performance, making positional deviations between them highly sensitive. Adjusting the relative positions of the primary and secondary mirrors primarily relies on wave aberration components, with the challenge lying in the quantitative control and operability of eccentric adjustment. Typical optical system designs rarely consider the manufacturability of primary and secondary mirror adjustment, resulting in complex adjustments that fail to meet precision requirements.

[0003] Currently, commonly used adjustment methods include set screw adjustment, manual translation adjustment, and vibration adjustment. These methods have drawbacks such as the inability to quantify control, difficulty in controlling adjustment precision, instability during the adjustment process, and susceptibility to attitude changes. Therefore, considering the manufacturability of the adjustment process in the structural design and treating the adjustment device as part of the optical system structure to achieve quantified control of the relative position adjustment process of the primary and secondary mirrors is of great significance. Summary of the Invention

[0004] The purpose of this invention is to provide a primary and secondary mirror optical system and its adjustment method with quantitative adjustment function, so as to solve the technical problems of existing primary and secondary mirror relative position adjustment which cannot be quantitatively controlled, is difficult to control adjustment accuracy, is unstable in adjustment process, and is prone to attitude change.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A primary and secondary mirror optical system with quantitative adjustment function includes a primary mirror and a secondary mirror; its special feature is that it also includes a primary mirror tube, a secondary mirror frame, and N cams, where N≥3 and are integers;

[0007] The primary mirror is circular and coaxially mounted inside the primary mirror tube;

[0008] The main lens barrel has N lugs on the outer side wall near the main lens exit end, and a light-transmitting hole matching the central hole of the main lens is provided in the center of each lug.

[0009] The secondary frame includes a first ring and a second ring arranged coaxially and parallel to each other; the first ring and the end face of the main lens barrel with a lug are in surface contact and movably connected; the lug protrudes from the outer wall of the first ring; the second ring is located on the side of the first ring away from the main lens barrel and is connected to the first ring through a plurality of circumferentially distributed support columns.

[0010] The secondary mirror is installed inside the second ring;

[0011] The cam is disc-shaped, and its outer circular outline is an Archimedean spiral; N cams are rotatably connected to N lugs respectively, and the sidewall of each cam abuts against the sidewall of the first ring; the N cams are used to adjust the position of the first ring on the end face of the main lens barrel by rotation.

[0012] Furthermore, the polar equation of the Archimedean spiral is:

[0013] r = 17.8 + (0.2 / π)θ

[0014] Where A is the distance from the starting point to the origin of the polar coordinates, B is the value that the radius r increases with each unit angle increase of the spiral, r is the radius, and θ is the polar angle.

[0015] Furthermore, the cam has evenly distributed engravings on the edge of the side away from the corresponding lug.

[0016] Furthermore, there are a total of 40 scribe lines, and the radius r of two adjacent scribe lines differs by 0.01 mm;

[0017] At the scribe lines corresponding to the polar angles θ of 0°, 90°, 180°, 270°, and 360°, there are numerical markings, with the numbers marked being 0, 0.1, 0.2, 0.3, and 0.4, respectively.

[0018] Furthermore, the initial position of the cam relative to the first ring is the position when the etched line corresponding to the number 0.2 is tangent to the first ring.

[0019] Furthermore, N=4;

[0020] The four lugs are evenly distributed around the side wall of the main lens barrel;

[0021] The four cams are rotatably connected to the four lugs respectively.

[0022] Furthermore, it also includes an Allen wrench, a cam screw, and a washer;

[0023] The cam has an internal hexagonal hole at the center of the side away from the lug;

[0024] The hex wrench is used to engage with the hex socket to rotate the cam;

[0025] The lug is provided with a shaft hole; the shaft hole is parallel to the central axis of the main lens barrel;

[0026] The center of the contact surface between the cam and the lug is connected to a rotating shaft for engaging with the shaft hole; the center of the end of the rotating shaft away from the cam is provided with a threaded hole along its axis.

[0027] The cam screw passes through the threaded hole from the side of the lug away from the corresponding cam, thereby enabling the cam and the corresponding lug to be rotatably connected through the shaft.

[0028] The washer is fitted onto the screw of the cam screw and is located between the screw head and the lug of the cam screw.

[0029] Furthermore, it also includes connecting bolts and connecting nuts;

[0030] The main lens barrel is provided with a first connecting lug on the outer side wall near the main lens exit end; the first connecting lug is provided with a first connecting hole; the first ring is provided with a second connecting lug on the outer side wall; the second connecting lug is provided with a second connecting hole.

[0031] The connecting bolts are inserted into the first connecting hole and the second connecting hole;

[0032] The connecting nut is threadedly connected to the connecting bolt, and the first connecting lug and the second connecting lug are fixed between the thread head of the connecting bolt and the connecting nut;

[0033] The diameter of the second connecting hole is larger than the outer diameter of the connecting bolt, thereby achieving the surface contact movable connection.

[0034] A method for adjusting a primary and secondary mirror optical system with quantization adjustment function, used in the aforementioned primary and secondary mirror optical system with quantization adjustment function; characterized in that it includes the following steps:

[0035] Step 1: Fix the position of the primary mirror, set up a laser interferometer on the side of the primary mirror away from the secondary mirror, and set up a plane mirror on the side of the secondary mirror away from the primary mirror.

[0036] Step 2: The laser interferometer emits a laser beam toward the primary mirror. The laser beam is reflected by the secondary mirror, the primary mirror, the plane mirror, the primary mirror, and the secondary mirror, and finally returns to the laser interferometer through the light-transmitting hole of the primary mirror tube. The laser interferometer obtains the aberration components of the optical system composed of the primary mirror and the secondary mirror.

[0037] Step 3: Rotate the corresponding cam based on the aberration components to translate the secondary mirror until the aberration components obtained by the laser interferometer approach 0, then the optical axis of the secondary mirror coincides with that of the primary mirror.

[0038] Furthermore, step 1 specifically includes:

[0039] Fix the primary mirror in a fixed position, set up a laser interferometer on the side of the primary mirror away from the secondary mirror, and set up a plane mirror on the side of the secondary mirror away from the primary mirror; at the same time, make the centers of two opposite cams of the four cams all on the horizontal line, and make the centers of the other two opposite cams all on the vertical line.

[0040] Step 3 specifically involves:

[0041] Using the horizontal line as the X-axis and the vertical line as the Y-axis, observe the aberration components acquired by the laser interferometer; when coma exists in the X-direction, rotate the two cams located on the X-axis in the opposite direction at the same time; when coma exists in the Y-direction, rotate the two cams located on the Y-axis in the opposite direction at the same time, thereby translating the secondary mirror until the aberration components acquired by the laser interferometer approach 0, then the optical axis of the secondary mirror coincides with that of the primary mirror.

[0042] The beneficial effects of this invention are:

[0043] 1. The device provided by the present invention uses multiple Archimedes spiral cams, which can precisely adjust the relative positions of the primary and secondary mirrors and quantify them through scale display, thus having good operability.

[0044] 2. This invention effectively solves the problem of quantitative adjustment of the relative positional relationship between the primary and secondary mirrors by setting scales and numerical markings on the cam, and the adjustment amount is visualized through scales and numerical markings.

[0045] 3. The outer ring contour of the cam provided by the present invention adopts an Archimedean spiral, which realizes constant speed adjustment and has good structural reliability.

[0046] 4. The present invention has an internal hexagonal hole on the cam. By using an internal hexagonal wrench to rotate the cam in conjunction with the internal hexagonal hole, compared with ordinary fine thread adjustment, the internal hexagonal wrench has a longer lever arm, resulting in higher adjustment accuracy and less effort in operation.

[0047] 5. The present invention sets up four cams arranged orthogonally in pairs, and their adjustment direction is consistent with the direction of the coma component during wave aberration detection. During adjustment, they can be adjusted independently according to the corresponding coma direction without affecting each other, resulting in higher adjustment accuracy.

[0048] 6. The method provided by this invention can be used not only for adjusting the relative positions of primary and secondary mirrors, but also for adjusting the translation of similar optical lens assemblies and mirror groups. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of an embodiment of a primary and secondary mirror optical system with quantization adjustment function according to the present invention;

[0050] Figure 2 yes Figure 1 A sectional view;

[0051] Figure 3 This is a top view of the cam in an embodiment of the present invention;

[0052] Figure 4 This is a partial structural diagram of the cam being rotated using an internal hex wrench in an embodiment of the present invention;

[0053] Figure 5 yes Figure 4Exploded view;

[0054] Figure 6 This is the detection optical path diagram constructed when adjusting the secondary mirror in an embodiment of the present invention.

[0055] Icon labels:

[0056] 10-Primary mirror, 11-Primary mirror tube, 111-Lug, 112-Light aperture, 20-Secondary mirror, 21-Secondary mirror frame, 211-First ring, 212-Second ring, 213-Support column, 31-Cam, 312-Graded line, 313-Number mark, 314-Hex socket hole, 315-Threaded hole, 316-Shaft, 32-Washer, 33-Cam screw, 4-Hex socket wrench, 5-Plane mirror, 6-Laser interferometer. Detailed Implementation

[0057] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] This invention provides a primary and secondary mirror optical system with quantization adjustment function, combined with... Figure 1 , Figure 2 As shown, it includes a primary mirror 10, a secondary mirror 20, a primary mirror tube 11, a secondary mirror frame 21, N cams 31, and an internal hex wrench 4, where N ≥ 3 and is an integer; in this embodiment, N = 4 is preferred; in other embodiments, N can also be 6, 8, 10, etc.

[0059] The primary mirror 10 is circular and is coaxially mounted inside the primary mirror tube 11;

[0060] The main lens barrel 11 has four lugs 111 on the outer side wall near the exit end of the main lens 10. The four lugs 111 are evenly distributed around the side wall of the main lens barrel 11 and are orthogonal in pairs. The center of the main lens barrel 11 has a light-transmitting hole 112 that matches the center hole of the main lens 10.

[0061] The secondary frame 21 includes a first ring 211 and a second ring 212 arranged coaxially and parallel to each other; the main lens barrel 11 is provided with a first connecting lug on the outer side wall near the exit end of the main lens 10; the first connecting lug is provided with a first connecting hole; the first ring 211 is provided with a second connecting lug on the outer side wall; the second connecting lug is provided with a second connecting hole; the first connecting lug and the second connecting lug are connected to a connecting bolt by a connecting nut, specifically, the connecting bolt passes through the first connecting hole and the second connecting hole; the connecting nut and the connecting bolt are threaded together, fixing the first connecting lug and the second connecting lug between the thread head of the connecting bolt and the connecting nut; the diameter of the second connecting hole is larger than the outer diameter of the thread of the connecting bolt, so that the first ring 211 can be movably connected to the surface of the main lens barrel 11.

[0062] Lug 111 protrudes from the outer wall of the first ring 211 and has a shaft hole on it; the shaft hole is parallel to the central axis of the main lens barrel 11; the second ring 212 is located on the side of the first ring 211 away from the main lens barrel 11 and is connected to the first ring 211 through a plurality of circumferentially distributed support columns 213.

[0063] The secondary mirror 20 is installed at the center of the second ring 212;

[0064] Cam 31 is disc-shaped, and its outer circular contour is an Archimedean spiral. The polar equation of the Archimedean spiral is: r = A + (B / π)θ, specifically r = 17.8 + (0.2 / π)θ in this embodiment. Where r is the radius and θ is the polar angle, the cam radius r is A = 17.8 mm at the polar angle θ = 0. After one revolution, the cam radius r is 18.2 mm. B = 0.2 / π is the rate of increase of the cam radius r with the polar angle θ. The theoretical distance between the center of the cam and the central axis of the secondary frame is 18 mm.

[0065] like Figure 3 As shown, each cam 31 has evenly distributed gratings 312 on its circumferential edge away from the corresponding lug 111. In this embodiment, there are 40 gratings 312, and the radius r of adjacent gratings 312 differs by 0.01 mm. Numerical markings 313 are provided at the gratings 312 corresponding to polar angles θ of 0°, 90°, 180°, 270°, and 360°: 0, 0.1, 0.2, 0.3, and 0.4, respectively. That is, there is a numerical marking at every 90° position, representing the increase in cam radius. The four cams 31 are rotatably connected to the four lugs 111, and the sidewall of each cam 31 abuts against the sidewall of the first ring 211. When two opposing cams 31 rotate simultaneously in opposite directions, the secondary frame 21 can be forced to undergo radial translation, thereby driving the secondary mirror 20 to translate. The four cams 31 are used to adjust the position of the first ring 211 on the main lens barrel 11 by rotation. Specifically, in conjunction with... Figure 4 , Figure 5As shown, a rotating shaft 316 is connected to the center of the contact surface between the cam 31 and the lug 111. The rotating shaft 316 passes through the shaft hole of the lug 111, i.e., the shaft and hole are fitted. A threaded hole 315 is provided along the axis of the center of the end of the rotating shaft 316 away from the cam 31. A cam screw 33 is threaded into the threaded hole 315 from the side of the lug 111 away from the corresponding cam 31, so that the cam 31 and the corresponding lug 111 can be rotatably connected. To ensure reliable connection, a washer 32 is also fitted on the screw of the cam screw 33. The washer 32 is located between the screw head of the cam screw 33 and the lug 111.

[0066] The initial position of cam 31 relative to the first ring 211 is the position where the graduation line 312 corresponding to the number 0.2 on cam 313 is tangent to the first ring 211. That is, in the initial position after cam 31 is installed, the graduation line 312 corresponding to the number 0.2 on cam 31 should be tangent to the secondary frame 21, with an adjustment range of 18±0.2mm. When cam 31 is turned clockwise, for each graduation line 312 that the position where cam 31 is tangent to the secondary frame 21 passes, the secondary frame 21 shifts 0.01mm away from cam 31.

[0067] Each cam 31 has an internal hexagonal hole 314 at the center of the side away from the lug 111; the size of the internal hexagonal hole 314 is determined according to the size of the working end of the internal hexagonal wrench 4, so as to facilitate the use of the internal hexagonal wrench 4 to turn the cam 31 to rotate the cam 31.

[0068] like Figure 6 As shown, the adjustment method of the primary and secondary mirror optical system with quantization adjustment function is as follows:

[0069] Step 1: Fix the main lens 10 in position, connect the first ring 211 to the main lens barrel 11 with connecting bolts and connecting nuts, but do not tighten them completely, install four cams 31, make the side wall of the cams contact the side wall of the first ring 211, adjust the rotation angle of the two opposite cams 31 so that the scales at the tangent points of the four cams 31 and the first ring 211 are all equal, and move the secondary lens frame 21 to the center position of the main lens barrel 11.

[0070] The detection optical path of the primary and secondary mirrors is constructed using a plane mirror 5 and a laser interferometer 6. Specifically, the laser interferometer 6 is set on the side of the primary mirror 10 away from the secondary mirror 20, and the plane mirror 5 is set on the side of the secondary mirror 20 away from the primary mirror 10. The phase of the primary and secondary mirror optical systems relative to the optical axis is adjusted so that the centers of two of the four cams 31 are on the horizontal line, and the centers of the other two cams 31 are on the vertical line.

[0071] Step 2: The laser interferometer 6 emits a laser to the primary mirror 10. The laser is reflected by the secondary mirror 20, the primary mirror 10, the plane mirror 5, the primary mirror 10, and the secondary mirror 20. Finally, it returns to the laser interferometer 6 through the light-transmitting hole 112 of the primary mirror tube 11. The laser interferometer 6 then obtains the aberration components of the primary mirror 10 and the secondary mirror 20.

[0072] Step 3: Observe the aberration components acquired by the laser interferometer 6; and adjust the radial translation of the secondary mirror 20 relative to the primary mirror 10 according to the aberration components.

[0073] When there is coma in the X direction of the system wave aberration, the two cams 31 located on the X axis are rotated in opposite directions to make the secondary mirror 20 translate along the X direction; when there is coma in the Y direction of the system wave aberration, the two cams 31 located on the Y axis are rotated in opposite directions to make the secondary mirror 20 translate along the Y direction until the aberration components acquired by the laser interferometer 6 approach 0. Then the optical axis of the secondary mirror 20 coincides with that of the primary mirror 10, and the connecting bolts are tightened.

[0074] During adjustment, insert the Allen wrench into the center hexagonal hole of the cam and rotate the two opposing cams simultaneously to make the secondary frame move horizontally in the X direction or vertically in the Y direction. When the cam rotates clockwise, it pushes the secondary frame away from the center of the cam. When the cam rotates counterclockwise, a gap appears between the secondary frame and the cam, requiring the other cam to rotate clockwise to push the secondary frame to move towards this side.

[0075] like Figure 6 As shown, with the horizontal line as the X-axis and the vertical line as the Y-axis, positions a and c are on the X-axis, and positions b and d are on the Y-axis. When cam 31 at position a rotates clockwise by one scale, cam 31 at position c should rotate counterclockwise by one scale to ensure the translation of the secondary frame 21.

[0076] After adjusting a pair of cams 31, tighten the corresponding cam screws 33; when adjustment is needed again, loosen the corresponding cam screws 33 appropriately; that is, when adjusting one pair of cams 31, the other pair of cams 31 in the orthogonal direction must be locked; after the secondary mirror 20 is adjusted, tighten the secondary mirror 20 completely.

[0077] Step 4: Remove cam 31, shim 32 and cam screw 33 to complete the adjustment of the primary and secondary mirrors.

[0078] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A primary and secondary mirror optical system with quantization adjustment function, comprising a primary mirror (10) and a secondary mirror (20); characterized in that: It also includes the main lens barrel (11), the secondary frame (21) and N cams (31), where N≥3 and is an integer; The main mirror (10) is circular and is coaxially installed inside the main mirror tube (11); The main lens tube (11) has N lugs (111) on the side wall near the exit end of the main lens (10), and a light-transmitting hole (112) matching the center hole of the main lens (10) is provided in its center. The secondary frame (21) includes a first ring (211) and a second ring (212) arranged coaxially and parallel to each other; the first ring (211) and the end face of the main lens barrel (11) with a lug (111) are in surface contact and movably connected; the lug (111) protrudes from the outer wall of the first ring (211); the second ring (212) is located on the side of the first ring (211) away from the main lens barrel (11), and is connected to the first ring (211) through a plurality of circumferentially distributed support columns (213); The secondary mirror (20) is installed inside the second ring (212); The cam (31) is disc-shaped, and its outer circular outline is an Archimedean spiral; N cams (31) are rotatably connected to N lugs (111), and the sidewall of each cam (31) abuts against the sidewall of the first ring (211); the N cams (31) are used to adjust the position of the first ring (211) on the end face of the main lens barrel (11) by rotation; The polar equation of the Archimedes spiral is: r = A + (B / π)θ Where r is the radius, A is the distance from the starting point to the origin of the polar coordinates, B is the value that the radius r increases with each unit angle increase of the spiral, and θ is the polar angle; The cam (31) has evenly distributed engraving lines (312) on the edge of the side away from the corresponding lug (111) in a circumferential direction. There are 40 engraving lines (312) in total, and the radius r of two adjacent engraving lines (312) differs by 0.01 mm; Numerical markers (313) are provided at the scribe lines (312) corresponding to the polar angles θ of 0°, 90°, 180°, 270°, and 360°, respectively.

2. The primary and secondary mirror optical system with quantization adjustment function according to claim 1, characterized in that: The numbers marked by the numerical markers (313) are 0, 0.1, 0.2, 0.3, and 0.4, respectively.

3. The primary and secondary mirror optical system with quantization adjustment function according to claim 2, characterized in that: The initial position of the cam (31) relative to the first ring (211) is the position when the etch line (312) corresponding to the number 0.2 is tangent to the first ring (211).

4. The primary and secondary mirror optical system with quantization adjustment function according to any one of claims 1-3, characterized in that: The N=4; The four lugs (111) are evenly distributed around the side wall of the main lens barrel (11); The four cams (31) are rotatably connected to the four lugs (111).

5. The primary and secondary mirror optical system with quantization adjustment function according to claim 4, characterized in that: It also includes an internal hex wrench (4), a cam screw (33), and a washer (32); The cam (31) has an internal hexagonal hole (314) at the center of the side away from the lug (111). The internal hex wrench (4) is used to engage with the internal hex socket (314) to rotate the cam (31). The lug (111) is provided with a shaft hole; the shaft hole is parallel to the central axis of the main lens barrel (11); The center of the contact surface between the cam (31) and the lug (111) is connected to a rotating shaft (316) for engaging with the shaft hole; the center of the rotating shaft (316) away from the cam (31) is provided with a threaded hole (315) along its axis. The cam screw (33) passes through the threaded hole (315) from the side of the lug (111) away from the corresponding cam (31), thereby enabling the cam (31) and the corresponding lug (111) to be rotatably connected through the shaft (316); The washer (32) is fitted onto the screw of the cam screw (33) and is located between the screw head and the lug (111) of the cam screw (33).

6. The primary and secondary mirror optical system with quantization adjustment function according to claim 5, characterized in that: It also includes connecting bolts and connecting nuts; The main lens tube (11) is provided with a first connecting ear on the side wall near the exit end of the main lens (10); the first connecting ear is provided with a first connecting hole; the first ring (211) is provided with a second connecting ear on the side wall; the second connecting ear is provided with a second connecting hole; The connecting bolts are inserted into the first connecting hole and the second connecting hole; The connecting nut is threadedly connected to the connecting bolt, and the first connecting lug and the second connecting lug are fixed between the thread head of the connecting bolt and the connecting nut; The diameter of the second connecting hole is larger than the outer diameter of the connecting bolt, thereby achieving the surface contact movable connection.

7. A method for adjusting a primary and secondary mirror optical system with quantization adjustment function, used in the primary and secondary mirror optical system with quantization adjustment function as described in any one of claims 1-6; characterized in that, Includes the following steps: Step 1: Fix the position of the primary mirror (10), set up a laser interferometer (6) on the side of the primary mirror (10) away from the secondary mirror (20), and set up a plane mirror (5) on the side of the secondary mirror (20) away from the primary mirror (10). Step 2: The laser interferometer (6) emits a laser beam toward the primary mirror (10). The laser beam is reflected by the secondary mirror (20), the primary mirror (10), the plane mirror (5), the primary mirror (10), and the secondary mirror (20). Finally, it returns to the laser interferometer (6) through the light-transmitting hole (112) of the primary mirror tube (11). The laser interferometer (6) obtains the aberration components of the optical system composed of the primary mirror (10) and the secondary mirror (20). Step 3: Rotate the corresponding cam (31) based on the aberration components, thereby translating the secondary mirror (20) until the aberration components obtained by the laser interferometer (6) approach 0, then the optical axis of the secondary mirror (20) coincides with that of the primary mirror (10).

8. The adjustment method for the primary and secondary mirror optical system with quantization adjustment function according to claim 7, characterized in that, Step 1 is as follows: The primary mirror (10) is fixed in position, and a laser interferometer (6) is set on the side of the primary mirror (10) away from the secondary mirror (20), and a plane mirror (5) is set on the side of the secondary mirror (20) away from the primary mirror (10); at the same time, the centers of two opposite cams (31) of the four cams (31) are all on the horizontal line, and the centers of the other two opposite cams (31) are all on the vertical line; Step 3 specifically involves: Using the horizontal line as the X-axis and the vertical line as the Y-axis, observe the aberration components obtained by the laser interferometer (6); when there is coma in the X direction, rotate the two cams (31) located on the X-axis in the opposite direction at the same time; when there is coma in the Y direction, rotate the two cams (31) located on the Y-axis in the opposite direction at the same time, thereby translating the secondary mirror (20) until the aberration components obtained by the laser interferometer (6) approach 0, then the optical axis of the secondary mirror (20) coincides with that of the primary mirror (10).

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