Long linear array high-precision focusing mechanism suitable for large-breadth space camera

Abstract

The invention discloses a long-linear-array high-precision focusing mechanism suitable for a large-breadth space camera, and relates to the technical field of space optical remote sensing, and the long-linear-array high-precision focusing mechanism comprises a force bearing structure which comprises a sliding seat and a base; the guide device is mounted between the sliding seat and the base; the transmission device is connected with the clearance eliminating nut; the driving device provides power for the transmission device and drives the clearance eliminating nut through the transmission device to push the sliding seat to do linear focusing motion along the guide device; and the position feedback device is used for detecting and feeding back the displacement of the sliding seat. The positioning precision and the shaking precision are fully considered in design, errors caused by nut assembly are absorbed through the floating switching hinge, and the shaking precision is improved; the guide rail pre-pressing device can improve the rigidity of the precise guide rail on the premise of not introducing extra disturbance, so that the sliding seat is ensured to shake around X; high-precision linear guide rail large-interval layout is adopted to ensure that the sliding seat shakes around Y, position feedback is conducted through a high-precision grating ruler, and the positioning precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of space optical remote sensing, and in particular to a long linear array high-precision focusing mechanism suitable for a wide-bandwidth space camera. Background Art

[0002] The environmental conditions in which space remote sensing cameras work are relatively complex and harsh. Due to changes in environmental conditions, the focal plane of the space remote sensing camera produces different degrees of defocus, resulting in image blur and affecting the imaging quality. In order to ensure the imaging quality of the space camera in complex and harsh environments, the position of the changing focal plane component of the space remote sensing camera must be corrected. At present, the resolution of space cameras is getting higher and higher, and the width is getting larger and larger, which means that the length and weight of the focal plane component have also increased significantly. For this kind of high-resolution, wide-width linear array push-broom camera, the focusing mechanism must not only meet traditional requirements (self-locking, cold welding resistance, good vibration resistance, etc.), but also meet the requirements of high shaking accuracy and high positioning accuracy.

[0003] Existing focusing mechanisms of space cameras usually have the following forms: (a) eccentric cam focusing method, the eccentricity of the eccentric cam determines the maximum focusing amount of the focusing mechanism, and its disadvantages are small linear focusing range, complex structure and large volume; (b) transmission method of gear pair series cylindrical cam groove, the projection distance of the cam curve groove along the optical axis direction is the maximum focusing amount of the focusing mechanism, and the structural configuration form is only suitable for the movable focusing of the lens barrel and lens group, and its disadvantages are high processing accuracy requirements of the cam curve groove and easy jamming; (c) transmission method of screw nut pair, the effective axial length of the screw nut pair determines the focusing amount of the focusing mechanism, the processing and assembly of the screw nut are relatively simple, and it is currently widely used, but there is a contradictory relationship between the "return clearance" and "motion accuracy" of this transmission method, that is, if the thread accuracy of the screw nut does not meet the sufficiently high requirements during processing, and the clearance is small, then its error will directly lead to the deterioration of the shaking accuracy of the focusing mechanism. If the influence of machining errors on the shaking accuracy of the focusing mechanism is to be reduced, a certain gap needs to exist between the lead screw and the nut to absorb the machining errors, which will result in a larger return error in the focusing mechanism.

[0004] Based on the above technical problems, technicians in this field urgently need to develop a long linear array high-precision focusing mechanism with good dynamic performance that can drive a focal plane with a relatively large aspect ratio and is suitable for large-width space cameras. Summary of the invention

[0005] The purpose of the present invention is to provide a long linear array high-precision focusing mechanism which has good dynamic performance and can drive a focal plane with a large aspect ratio and is suitable for a wide-space camera.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention discloses a long linear array high-precision focusing mechanism suitable for a large wide-space camera, the focusing mechanism comprising:

[0008] a load-bearing structure, which includes a slide and a base; and

[0009] A guide device, installed between the slide and the base;

[0010] A transmission device connected to the clearance eliminating nut;

[0011] A driving device, which provides power to the transmission device and drives the clearance-eliminating nut through the transmission device to push the slide seat to perform a linear focusing motion along the guide device;

[0012] The focusing mechanism also includes:

[0013] The position feedback device is used to detect the displacement of the slide and provide feedback.

[0014] Preferably, the guiding device is a linear guide rail, the linear guide rail is mounted on the base by screws, and the slide seat and the guide rail slider are fixedly connected by screws, so that the slide seat can translate along the direction of the linear guide rail.

[0015] Preferably, the driving device is a stepping motor arranged at the bottom of the base.

[0016] Furthermore, the transmission device includes a worm connected to the stepping motor through a coupling; and

[0017] A worm wheel matched with the worm;

[0018] A screw rod, the worm wheel and the screw rod are circumferentially positioned by a flat key, and the sleeve is used to axially position the worm wheel so that the worm wheel is fastened to the screw rod shaft, and the screw rod shaft is installed on the base in a supporting manner with one end fixed and the other end floating;

[0019] A deep groove ball bearing provided at the fixed end of the screw shaft;

[0020] An angular contact ball bearing is arranged at the movable end of the screw shaft.

[0021] Furthermore, the focusing mechanism also includes a guide rail pre-pressing device connected to the base; and

[0022] The floating transfer hinge is connected to the clearance eliminating nut and the sliding seat at the front and rear ends respectively.

[0023] Furthermore, the guide rail preloading device includes a pull rod having an overall U-shaped structure;

[0024] A standard height gauge block installed in the U-shaped groove of the pull rod, the height of the standard height gauge block being the same as the sum of the thickness of the guide device plus the slide seat;

[0025] A linear bearing is fixed on the pull rod by a locking nut.

[0026] Preferably, the tie rod mounting surface is lower than the standard height gauge block by a distance of 0.007 to 0.01 mm.

[0027] Furthermore, the floating transfer hinge includes a front connecting plate, and the front connecting plate is connected to the clearance eliminating nut by screws; and

[0028] A rear connecting plate is matched with the front connecting plate without clearance through a hinge pin and four connecting rods, and the rear connecting plate is connected to the sliding seat through screws.

[0029] Further, the clearance eliminating nut comprises a main body nut; and

[0030] A clearance adjustment nut fixedly connected to the main body nut by a process screw;

[0031] A wave spring is arranged between the main body nut and the gap adjustment nut, and the wave spring applies opposite thrusts to the main body nut and the gap adjustment nut to eliminate the gap.

[0032] Preferably, the position feedback device is a grating ruler, and the displacement of the slide relative to the base is read by the grating ruler to perform position feedback.

[0033] In the above technical solution, the present invention provides a long linear array high-precision focusing mechanism suitable for a large wide space camera, which has the following beneficial effects:

[0034] The invention discloses a long linear array high-precision focusing mechanism suitable for a large-width space camera. The positioning accuracy and shaking accuracy are fully considered in the design. A floating transfer hinge is used to absorb the error caused by the nut assembly to improve the shaking accuracy. The guide rail preloading device can improve the rigidity of the precision guide rail without introducing additional disturbance, thereby ensuring the X-axis shaking of the slide. A high-precision grating ruler is used for position feedback to improve the positioning accuracy.

[0035] The present invention is a focusing mechanism for a long linear array focal plane assembly, and its linear array length dimension is greater than the dimensions in other directions. Therefore, the rigidity of the mechanism is relatively large in structural design, avoiding the phenomenon of "waist collapse" caused by its own weight;

[0036] The present invention adopts a wave spring clearance-eliminating nut for transmission, so that the clearance between the screw rod and nut pair is eliminated by the wave spring, thereby improving the positioning stability of the focusing mechanism;

[0037] The preload force of the clearance eliminating nut of the present invention can be both coarsely adjusted and finely adjusted. The spring compression amount can be coarsely adjusted by adjusting the axial position of the clearance adjusting nut, and the adjustment resolution is one pitch. The spring compression amount can be finely adjusted by adjusting the circumferential relative position of the clearance adjusting nut and the main body nut, and the adjustment resolution is one twelfth of the lead. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0039] Figure 1 A schematic diagram of the overall structure of a long linear array high-precision focusing mechanism suitable for a large wide-space camera provided by an embodiment of the present invention;

[0040] Figure 2 A stereoscopic diagram of a long linear array high-precision focusing mechanism suitable for a large wide-space camera provided by an embodiment of the present invention;

[0041] Figure 3 A cross-sectional view of a long linear array high-precision focusing mechanism suitable for a large wide-space camera provided by an embodiment of the present invention;

[0042] Figure 4 An exploded diagram of a clearance-eliminating nut of a long linear array high-precision focusing mechanism suitable for a large wide-space camera provided by an embodiment of the present invention;

[0043] Figure 5 A schematic diagram of pre-tightening adjustment of clearance elimination nuts of a long linear array high-precision focusing mechanism applicable to a wide-space camera provided by an embodiment of the present invention;

[0044] Figure 6a A schematic diagram of a backlash-eliminating nut of a long linear array high-precision focusing mechanism for a large wide-space camera provided by an embodiment of the present invention;

[0045] Figure 6b A schematic diagram of a backlash-eliminating nut of a long linear array high-precision focusing mechanism suitable for a large wide-space camera provided by an embodiment of the present invention after backlash elimination;

[0046] Figure 7 A structural diagram of a guide rail preloading device for a long linear array high-precision focusing mechanism applicable to a wide-space camera provided by an embodiment of the present invention;

[0047] Figure 8a A schematic diagram of the height of a guide rail preloading device for a long linear array high-precision focusing mechanism applicable to a wide-space camera provided by an embodiment of the present invention;

[0048] Figure 8b A schematic diagram of a detection method for pre-loading amount of a guide rail of a long linear array high-precision focusing mechanism for a wide-space camera provided by an embodiment of the present invention;

[0049] Fig. 9 A schematic diagram of a floating transfer hinge structure of a long linear array high-precision focusing mechanism suitable for a wide-space camera provided by an embodiment of the present invention;

[0050] Fig.10a A focusing principle diagram of a long linear array high-precision focusing mechanism suitable for a large wide-space camera provided by an embodiment of the present invention;

[0051] Fig.10b A focusing and error absorption principle diagram of a long linear array high-precision focusing mechanism suitable for a large wide-space camera provided by an embodiment of the present invention;

[0052] Fig.11 A schematic diagram of force analysis of a floating transfer hinge of a long linear array high-precision focusing mechanism suitable for a wide-space camera provided in an embodiment of the present invention.

[0053] Description of reference numerals:

[0054] 1. Load-bearing structure; 2. Guide device; 3. Transmission device; 4. Drive device; 5. Clearance-eliminating nut; 6. Guide rail preloading device; 7. Floating transfer hinge; 8. Position feedback device;

[0055] 101. Sliding seat; 102. Base;

[0056] 301, worm; 302, worm wheel; 303, lead screw; 304, flat key; 305, deep groove ball bearing; 306, angular contact ball bearing;

[0057] 501, main body nut; 502, wave spring; 503, clearance adjustment nut; 504, process screw;

[0058] 601, tie rod; 602, locking nut; 603, linear bearing; 604, standard height gauge block;

[0059] 701, front connecting plate; 702, connecting rod; 703, hinge pin; 704, rear connecting plate. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0061] See also Figures 1 to 11 As shown;

[0062] The present invention discloses a long linear array high-precision focusing mechanism suitable for a large wide-space camera, the focusing mechanism comprising:

[0063] A load-bearing structure 1, comprising a slide 101 and a base 102; and

[0064] A guide device 2, installed between the slide 101 and the base 102;

[0065] The transmission device 3 is connected with the clearance eliminating nut 5;

[0066] The driving device 4 provides power to the transmission device 3, and drives the clearance elimination nut 5 through the transmission device 3 to push the slide 101 to perform a linear focusing motion along the guide device 2;

[0067] The focusing mechanism also includes:

[0068] The position feedback device 8 is used to detect the displacement of the slide 101 and provide feedback.

[0069] As a preferred technical solution of this embodiment, the guiding device 2 is a linear guide rail, which is installed on the base 102 by screws, and the slide 101 is fixed to the guide rail slider by screws, so that the slide can translate along the direction of the linear guide rail.

[0070] As a preferred technical solution of this embodiment, the driving device 4 is a stepping motor arranged at the bottom of the base 102 .

[0071] As a further introduction to this embodiment, the transmission device 3 includes a worm 301 connected to the stepping motor via a coupling; and

[0072] A worm wheel 302 adapted to the worm 301;

[0073] The screw rod 303, the worm wheel 302 and the screw rod 303 are circumferentially positioned by a flat key 304, and the sleeve axially positions the worm wheel 302 so that the worm wheel 302 is fastened to the screw rod 303 shaft, and the screw rod 303 shaft is installed on the base 102 in a supporting manner with one end fixed and the other end floating;

[0074] A deep groove ball bearing 305 provided at the fixed end of the screw rod 303;

[0075] An angular contact ball bearing 306 is provided at the axial free end of the screw rod 303 .

[0076] As a further introduction to this embodiment, the focusing mechanism further includes a guide rail pre-pressing device 6 connected to the base 102; and

[0077] The floating transfer hinge 7 is connected to the clearance eliminating nut 5 and the sliding seat 101 at the front and rear ends thereof respectively.

[0078] As a further introduction to this embodiment, the guide rail preloading device 6 includes a pull rod 601 with an overall U-shaped structure;

[0079] A standard height gauge block 604 installed in the U-shaped groove of the pull rod 601, wherein the height of the standard height gauge block 604 is equal to the sum of the thickness of the guide device 2 and the slide seat 101;

[0080] The linear bearing 603 is fixed on the pull rod 601 by a locking nut 602. The working principle of the guide rail preloading device 6 is as follows: In order to improve the rigidity of the guide rail in the direction of rotation around the X-axis, a guide rail preloading device 6 is designed, as shown in 7. In order to uniformly apply preloading to the guide rail, two linear bearings 603 are used for preloading. The linear bearing 603 is in line contact with the embedded parts of the slide 101, and only provides positive pressure, which will not affect the movement accuracy of the guide rail. When controlling the preloading amount, the height difference between the mounting surface of the pull rod 601 and the standard height gauge block 604 is controlled by grinding, thereby controlling the preloading amount of the guide rail preloading device 6.

[0081] As a preferred technical solution of this embodiment, the pull rod 601 is ground so that the mounting surface of the pull rod 601 is lower than the standard height gauge block 604 by a distance of 0.007-0.01 mm. Then the guide rail preloading device 6 is installed in the focusing mechanism to complete the preloading of the guide rail.

[0082] As a further introduction to this embodiment, the floating transfer hinge 7 includes a front connecting plate 701, and the front connecting plate 701 is connected to the clearance eliminating nut 5 by screws; and

[0083] A rear connecting plate 704 is seamlessly matched with the front connecting plate 701 through a hinge pin 703 and four connecting rods 702, and the rear connecting plate 704 is connected to the slide seat 101 through screws.

[0084] The front connecting plate 701 and the rear connecting plate 702 are processed with a limit platform, which only allows the floating transfer hinge 7 to rotate within a small angle, so as to facilitate the subsequent overall assembly of the mechanism.

[0085] As a further introduction to this embodiment, the clearance eliminating nut 5 comprises a main body nut 501; and

[0086] The gap adjustment nut 503 is fixedly connected to the main body nut 501 by the process screw 504, and then the gap elimination nut 5 is matched and processed by the finely processed screw rod 303. After the matching and grinding is completed, the process screw 504 is removed;

[0087] The wave spring 502 disposed between the main body nut 501 and the gap adjustment nut 503 provides opposite thrusts to the main body nut 501 and the gap adjustment nut 503 to eliminate the gap. The working principle of the gap elimination nut is as follows: After fine processing, such as Figure 6a There is an initial gap between the clearance eliminating nut 5 and the screw rod 303. Then the wave spring 502 is installed between the main body nut 501 and the clearance adjusting nut 503, as shown in FIG. Figure 6b . The gap between the clearance eliminating nut 5 and the screw rod 303 is eliminated by the thrust generated by the wave spring 502 being compressed. The clearance adjusting nut 503 is machined with 12 convex teeth, and the corresponding main body nut 501 is machined with 12 tooth grooves. Each time a tooth is rotated to correspond to a tooth groove, the clearance adjusting nut 503 moves axially by 1 / 12 of the lead relative to the screw rod 303, thereby adjusting the axial distance between the clearance adjusting nut 503 and the main body nut 501 with high precision, and then adjusting the preload force. If the preload force needs to be roughly adjusted, the clearance adjusting nut 503 only needs to be axially moved by an integral multiple of the pitch, and then the screw rod 303 is screwed in.

[0088] As a preferred technical solution of this embodiment, the position feedback device 8 is a grating ruler, and the displacement of the slide 101 relative to the base 102 is read by the grating ruler to perform position feedback.

[0089] The focusing principle of the focusing mechanism of the present invention is as follows: when the focusing mechanism receives the focusing instruction, the stepper motor rotates, and is transmitted to the worm 301 through the coupling, thereby driving the worm wheel 302 to rotate, and the worm wheel 302 drives the screw 303 to rotate synchronously through the flat key 304, and the spiral transmission pair converts the rotation of the screw 303 into the axial movement of the anti-backlash nut 5 along the screw 303. The anti-backlash nut 5 is fixedly connected to the front connecting plate 701 by screws, and the rear connecting plate 704 is fixedly connected to the slide 101 by screws. Finally, the anti-backlash nut 5 pushes the slide 101 to perform linear focusing motion along the linear guide rail. The grating ruler reads the relative displacement of the slide 101 relative to the base 102 to provide position feedback.

[0090] Since the rigidity of the slide 101 and the guide rail in the Y-axis rotation direction is very high, the error of the screw 303 has little effect on the motion swing accuracy in this direction. However, due to the large aspect ratio of the slide 101, its rigidity in the X-axis rotation direction is low, and it is more sensitive to the up and down floating error of the clearance nut 5 in the movement. The principle of the floating transfer hinge 7 is to use the parallelogram deformation principle to absorb the up and down movement error of the clearance nut 5 in the Y direction during the Z-direction forward movement. The principle is shown in Fig.10b . Fig.11It is a force analysis diagram of the hinge when the mechanism is subjected to vibration in the self-locking state. β is the angle generated by the floating transfer hinge 7 after absorbing the assembly error during the movement, γ is the angle between the rotation axis of the screw 303 and the movement direction of the guide rail; FH is the pressure given to the hinge by the slide 101, FD is the pressure given by the guide rail, and FJ is the combined force of the two. Among them, β and γ are usually in the second level, FJ can be approximately equal to FH, and the radial force on the screw and the additional pressure FD on the guide rail are almost zero. At this time, the floating transfer hinge 7 is approximately in the dead point position, so the stiffness of the entire hinge is relatively high, and it will not affect the overall dynamic response of the mechanism. When the hinge is processed, the shaft and hole are matched, and it can be considered that there is a zero gap between the rotating pairs, eliminating the return gap of the mechanism.

[0091] In the above technical solution, the present invention provides a long linear array high-precision focusing mechanism suitable for a large wide space camera, which has the following beneficial effects:

[0092] The invention discloses a long linear array high-precision focusing mechanism suitable for a large-width space camera. The positioning accuracy and shaking accuracy are fully considered in the design. A floating transfer hinge is used to absorb the error caused by the nut assembly to improve the shaking accuracy. The guide rail preloading device can improve the rigidity of the precision guide rail without introducing additional disturbance, thereby ensuring the X-axis shaking of the slide. A high-precision grating ruler is used for position feedback to improve the positioning accuracy.

[0093] The present invention is a focusing mechanism for a long linear array focal plane assembly, and its linear array length dimension is greater than the dimensions in other directions. Therefore, the rigidity of the mechanism is relatively large in structural design, avoiding the phenomenon of "waist collapse" caused by its own weight;

[0094] The present invention adopts a wave spring clearance-eliminating nut for transmission, so that the clearance between the screw rod and nut pair is eliminated by the wave spring, thereby improving the positioning stability of the focusing mechanism;

[0095] The preload force of the clearance eliminating nut of the present invention can be both coarsely adjusted and finely adjusted. The spring compression amount can be coarsely adjusted by adjusting the axial position of the clearance adjusting nut, and the adjustment resolution is one pitch. The spring compression amount can be finely adjusted by adjusting the circumferential relative position of the clearance adjusting nut and the main body nut, and the adjustment resolution is one twelfth of the lead.

[0096] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A long linear array high-precision focusing mechanism suitable for a wide-space camera, characterized in that: The focusing mechanism comprises: A load-bearing structure (1), comprising a slide seat (101) and a base seat (102); and A guide device (2) installed between the slide seat (101) and the base (102); A transmission device (3) connected to the clearance eliminating nut (5); A driving device (4) provides power to the transmission device (3), and drives the clearance elimination nut (5) through the transmission device (3) to push the slide seat (101) along the guide device (2) to perform a linear focusing motion; The focusing mechanism also includes: A position feedback device (8) is used to detect the displacement of the slide seat (101) and provide feedback.

2. The long linear array high-precision focusing mechanism suitable for a wide-space camera according to claim 1, characterized in that: The guide device (2) is a linear guide rail, which is mounted on the base (102) by means of screws, and the slide seat (101) is fixedly connected to the guide rail slider by means of screws, so that the slide seat can move in translation along the direction of the linear guide rail.

3. The long linear array high-precision focusing mechanism suitable for a wide-space camera according to claim 1, characterized in that: The driving device (4) is a stepping motor arranged at the bottom of the base (102).

4. The long linear array high-precision focusing mechanism suitable for a wide-space camera according to claim 3, characterized in that: The transmission device (3) comprises a worm (301) connected to the stepping motor via a coupling; and A worm wheel (302) adapted to the worm (301); The screw rod (303) is circumferentially positioned with the worm wheel (302) and the screw rod (303) by means of a flat key (304); the sleeve is axially positioned with the worm wheel (302) so that the worm wheel (302) is fastened to the screw rod (303) shaft; the screw rod (303) shaft is mounted on the base (102) in a supporting manner with one end fixed and the other end movable; A deep groove ball bearing (305) provided at the fixed end of the screw rod (303); An angular contact ball bearing (306) is provided at the movable end of the screw rod (303).

5. The long linear array high-precision focusing mechanism suitable for a wide-space camera according to claim 1, characterized in that: The focusing mechanism also includes a guide rail pre-pressing device (6) connected to the base (102); and A floating transfer hinge (7) is connected to the clearance-eliminating nut (5) and the sliding seat (101) at the front and rear ends thereof respectively.

6. The long linear array high-precision focusing mechanism suitable for a wide-space camera according to claim 5, characterized in that: The guide rail preloading device (6) comprises a pull rod (601) having an overall U-shaped structure; A standard height gauge block (604) installed in the U-shaped groove of the pull rod (601), wherein the height of the standard height gauge block (604) is the same as the sum of the thickness of the guide device (2) and the slide seat (101); A linear bearing (603) is fixed on the pull rod (601) via a locking nut (602).

7. The long linear array high-precision focusing mechanism suitable for a wide-space camera according to claim 6, characterized in that: The installation surface of the pull rod (601) is lower than the standard height gauge block (604) by a distance of 0.007 to 0.01 mm.

8. The long linear array high-precision focusing mechanism suitable for a wide-space camera according to claim 5, characterized in that: The floating transfer hinge (7) comprises a front connecting plate (701), and the front connecting plate (701) is connected to the clearance eliminating nut (5) via screws; and A rear connecting plate (704) is matched with the front connecting plate (701) without clearance through a hinge pin (703) and four connecting rods (702), and the rear connecting plate (704) is connected to the sliding seat (101) through screws.

9. The long linear array high-precision focusing mechanism suitable for a wide-space camera according to claim 1, characterized in that: The clearance eliminating nut (5) comprises a main body nut (501); and A clearance adjustment nut (503) fixedly connected to the main body nut (501) via a process screw (504); A wave spring (502) is provided between the main body nut (501) and the gap adjustment nut (503), and the wave spring (502) applies opposite thrusts to the main body nut (501) and the gap adjustment nut (503) to eliminate the gap.

10. A long linear array high-precision focusing mechanism suitable for a wide-space camera according to any one of claims 1 to 9, characterized in that: The position feedback device (8) is a grating ruler, and the displacement of the slide (101) relative to the base (102) is read by the grating ruler to perform position feedback.

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