A fast response spatial camera focusing mechanism

Abstract

The utility model discloses a kind of quick response's space camera focusing mechanism, it is related to space camera focusing equipment technical field, it includes fixed frame, driving mechanism, transmission mechanism and moving mechanism, the driving mechanism is set to the top of fixed frame one side;The input of transmission mechanism is connected with the output of driving mechanism;The input of moving mechanism is connected with the output of transmission mechanism;The transmission mechanism includes eccentric shaft seat fixed in fixed frame, the eccentric shaft seat is connected with the middle part of swing arm by eccentric shaft, the one end of gear on swing arm is combined with second gear and is connected, the worm wheel is connected with the output of driving mechanism;The other end of swing arm is connected with connecting rod by pivot, the other end of connecting rod is connected with moving mechanism by another pivot.The utility model improves camera overall reliability, reduces production processing cost and launch cost;Through big reduction ratio, improve focusing precision;Quick response, quick focusing.

Description

Technical Field

[0001] This utility model relates to the technical field of space camera focusing equipment, and in particular to a fast-response space camera focusing mechanism. Background Technology

[0002] Space optical remote sensing typically uses satellites or deep space probes carrying optical remote sensing camera payloads to perform high-precision imaging observations of specific targets and areas, playing a crucial role in applications such as satellites, deep space exploration, and laser weapons. The optical system of a remote sensing camera adjusts the focal length by moving a plane mirror to acquire a clear image of the subject. The focusing mechanism, a vital component of the space optomechanical system, is fixedly connected to the camera's main load-bearing structure. It connects to and drives the movement of the focal plane components, compensating for defocus through high-precision micro-stroke adjustment. This is a crucial link and technical means to ensure the quality of remote sensing imaging.

[0003] To ensure smooth focusing, similar products often use a combination of lead screw and nut with guide rail and slider, which results in a large size and weight. Especially when moving with a large stroke, longer steel guide rails and larger space are required, ultimately leading to increased weight. To ensure higher focusing accuracy, the reduction ratio of the motion mechanism is very large. Traditional structures cannot meet the requirements of large reduction ratios in compact spaces. Increasing the reduction ratio slows down the focusing response and makes it impossible to quickly complete the spatial imaging requirements.

[0004] Meanwhile, conventional focusing mechanisms increase the reduction ratio and thus improve focusing accuracy through the series connection of worm gears and leadscrews. This requires increasing the reduction ratio of the worm gears and decreasing the lead of the leadscrew. However, the reduction ratio of the worm gears cannot be increased indefinitely because space cameras have strict space requirements, so the reduction ratio can only be increased as much as possible within a limited space. By increasing the size of the worm gears in this way, the stroke of the leadscrew will increase, resulting in a larger space requirement.

[0005] Therefore, those skilled in the art have provided a fast-response focusing mechanism for a space camera to solve the problems mentioned in the background art. Utility Model Content

[0006] This utility model provides a fast-response space camera focusing mechanism that reduces the size and weight of the focusing mechanism; achieves a large reduction ratio through a compact structural design, improving the accuracy of the focusing mechanism itself in a smaller space; and improves the response speed of the focusing mechanism while ensuring focusing accuracy, enabling it to achieve rapid focusing without changing the motor speed.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] This utility model discloses a fast-response space camera focusing mechanism, comprising:

[0009] A fixed frame, with connecting seats installed at both the top and bottom ends of the fixed frame;

[0010] A drive mechanism is disposed on one side of the top of the fixed frame;

[0011] A transmission mechanism, wherein the input end of the transmission mechanism is connected to the output end of the drive mechanism, and the drive mechanism is capable of driving the transmission mechanism to work;

[0012] A moving mechanism, wherein the input end of the moving mechanism is connected to the output end of the transmission mechanism, and the transmission mechanism is capable of driving the moving mechanism to move;

[0013] The transmission mechanism includes a worm gear shaft system frame fixed on a fixed frame and an eccentric shaft seat inside the fixed frame. The eccentric shaft seat is located above the moving mechanism and is connected to the middle of the swing arm via an eccentric shaft. One end of the swing arm with a gear meshes with the gear. The gear is coaxially arranged with the worm gear and fixed on the worm gear shaft system frame, and the worm gear can drive the gear to rotate. The other end of the swing arm is connected to one end of a connecting rod via a rotating shaft, and the other end of the connecting rod is connected to the moving mechanism via another rotating shaft.

[0014] Furthermore, a mounting plate is provided in the middle of the fixed frame, the eccentric shaft seat is fixed on the mounting plate, the gear is located above the mounting plate, and the moving mechanism is located below the mounting plate.

[0015] Furthermore, the connecting rod includes a straight rod, and each end of the straight rod has a bearing, and the two bearings are rotatably connected to the corresponding rotating shafts.

[0016] Furthermore, the straight rod has connecting parts at both ends, and the connecting parts are connected to the corresponding bearings to form an integral structure. The connection between the straight rod and the connecting parts is a circular arc transition connection, and the two bearings are located on the same side of the straight rod.

[0017] Furthermore, a worm gear shaft frame is installed on one side of the fixed frame, and the worm gear and gear are rotatably installed within the worm gear shaft frame.

[0018] Furthermore, the drive mechanism includes a worm shaft system frame disposed outside the worm gear shaft system frame. A motor is installed at one end of the worm shaft system frame. The output end of the motor drives the worm shaft inside the worm shaft system frame to rotate. The worm shaft is meshed with the worm wheel.

[0019] Furthermore, the moving mechanism includes two guide rails symmetrically arranged within the fixed frame, a moving frame is mounted on the two guide rails, one end of the moving frame is connected to the corresponding bearing via another rotating shaft, and a focusing component is mounted on the moving frame.

[0020] Furthermore, each of the guide rails is capable of moving along the length of the groove on the top surface of the corresponding slider. The guide rails are fixedly connected to the moving frame, and the two sliders are fixedly connected to the fixed frame.

[0021] Furthermore, the end of the movable frame protrudes outward to form a boss, and the top of the boss is rotatably connected to a corresponding bearing through another rotating shaft. The movable frame is located below the mounting plate.

[0022] In the above technical solution, the fast-response space camera focusing mechanism provided by this utility model has the following beneficial effects:

[0023] 1. Small size, light weight, and compact structure improve the overall reliability of the camera and reduce production and launch costs;

[0024] 2. Improve focusing accuracy by using a large reduction ratio;

[0025] 3. Fast response and fast focusing. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 An isometric view of a fast-response space camera focusing mechanism provided for an embodiment of this utility model;

[0028] Figure 2 An isometric view of a fast-response space camera focusing mechanism provided in an embodiment of this utility model from another direction;

[0029] Figure 3 A front view of a fast-response space camera focusing mechanism provided in an embodiment of this utility model;

[0030] Figure 4 A top view of a fast-response space camera focusing mechanism provided for an embodiment of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Fixed frame; 11. Connecting seat;

[0033] 20. Eccentric bearing; 21. Swing arm; 22. Connecting rod;

[0034] 221. Straight rod; 222. Bearing; 223. Connecting part;

[0035] 30. Gear; 31. Worm gear; 32. Worm gear shaft frame;

[0036] 40. Worm shaft system frame; 41. Motor; 42. Worm shaft;

[0037] 50. Guide rail; 51. Moving frame; 52. Slide rail; 53. Slider; 54. Boss. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0039] See Figure 1-4 As shown;

[0040] The fast-response space camera focusing mechanism described in this embodiment includes:

[0041] The fixed frame 10 has connecting seats 11 installed at both its top and bottom ends; the fixed frame 10 serves as the base for the overall structure of the mechanism, providing structural support and connecting with the camera structural components.

[0042] A drive mechanism is disposed on one side of the top of the fixed frame 10;

[0043] A transmission mechanism, wherein the input end of the transmission mechanism is connected to the output end of the drive mechanism, and the drive mechanism is capable of driving the transmission mechanism to work; the transmission mechanism is used to push the moving structure to move;

[0044] A moving mechanism, the input end of which is connected to the output end of a transmission mechanism, and the transmission mechanism is capable of driving the moving mechanism to move; the moving mechanism is used in the moving assembly of the focusing mechanism; and is connected to the focusing moving assembly;

[0045] The transmission mechanism includes a worm gear shaft system frame 32 fixed on a fixed frame 10 and an eccentric shaft seat 20 inside the fixed frame 10. The eccentric shaft seat 20 is located above the moving mechanism. The eccentric shaft seat 20 is connected to the middle of the swing arm 21 through an eccentric shaft. One end of the swing arm 21 with a gear meshes with a gear 30. The gear 30 is coaxially arranged with the worm gear 31 and fixed on the worm gear shaft system frame 32, and the worm gear 31 can drive the gear 30 to rotate. The other end of the swing arm 21 is connected to one end of a connecting rod 22 through a rotating shaft. The other end of the connecting rod 22 is connected to the moving mechanism through another rotating shaft.

[0046] In actual operation, the drive mechanism drives the worm wheel 31 to rotate, the worm wheel 31 rotates synchronously with the gear 30, the gear 30 drives the swing arm 21 that meshes with it to rotate, and the other end of the swing arm 21 drives the moving mechanism to move through the connecting rod 22, thereby completing the focusing work.

[0047] The eccentric bearing 20 provides high-precision and reliable support for the movement of the eccentric shaft and the rocker arm 21. The center of the eccentric bearing 20 is not on the line connecting the worm gear shaft and the connecting rod and the moving frame, hence the name eccentric bearing.

[0048] Link 22 transmits the force and displacement from swing arm 21 to the moving mechanism.

[0049] The fixed frame 10 has a mounting plate in the middle, the eccentric shaft seat 20 is fixed on the mounting plate, the gear 30 is located above the mounting plate, and the moving mechanism is located below the mounting plate to avoid interference during operation.

[0050] The connecting rod 22 includes a straight rod 221, with bearings 222 at both ends of the straight rod 221. The two bearings 222 are rotatably connected to the corresponding rotating shafts. When the swing arm 21 rotates, the swing arm 21 and the rotating shaft, as well as the rotating shaft and the bearings 222, are rotatably connected, thus pushing the straight rod 221 to move. The other rotating shaft is rotatably connected to the other bearing 222, thus the straight rod 221 drives the moving mechanism to move.

[0051] The straight rod 221 has connecting parts 223 at both ends. The connecting parts 223 are connected to the corresponding bearings 222 to form an integral structure. The connection between the straight rod 221 and the connecting parts 223 is a rounded transition connection, and the two bearings 222 are located on the same side of the straight rod 221.

[0052] A worm gear shaft system frame 32 is mounted on one side of the fixed frame 10, and the worm gear 31 and gear 30 are rotatably mounted within the worm gear shaft system frame 32. The worm gear shaft system frame provides high-precision and reliable support for the worm gear shaft and gear 30.

[0053] The drive mechanism includes a worm shaft system frame 40 disposed outside the worm gear shaft system frame 32. A motor 41 is mounted on one end of the worm shaft system frame 40. The output end of the motor 41 drives the worm shaft 42 inside the worm shaft system frame 40 to rotate. The worm shaft 42 is meshed with the worm gear 31. The worm gear shaft system frame 40 provides high-precision and reliable support for the worm shaft 42, the motor 41, etc.

[0054] When the motor 41 is working, it drives the worm wheel 30 to rotate through the worm shaft 42, which in turn drives the moving mechanism to move through the swing arm 21 and the straight rod 221 to complete the focusing work.

[0055] The moving mechanism includes two guide rails 50 symmetrically arranged within the fixed frame 10. A moving frame 51 is mounted on the two guide rails 50. One end of the moving frame 51 is connected to the corresponding bearing 222 via another rotating shaft. A focusing component is mounted on the moving frame 51.

[0056] Each guide rail 50 can move along the length direction of the groove 52 on the top surface of the corresponding slider 53. The guide rail 50 is fixedly connected to the moving frame 51, and the two sliders 53 are fixedly connected to the fixed frame 10. The moving frame 51, the guide rail 50, and the slider 53 together form a high-precision moving pair, which is the basis for ensuring high-precision movement.

[0057] When the straight rod 221 drives the moving frame 51 to move through the bearing and the rotating shaft, the focusing component on the moving frame 51 moves with the moving frame to complete the focusing work.

[0058] The end of the movable frame 51 protrudes outward to form a boss 54, and the top of the boss 54 is rotatably connected to the corresponding bearing 222 through another rotating shaft; by setting the boss 54, the overall size of the movable frame 51 is reduced.

[0059] When the movable frame 51 is not working, it is located inside the fixed frame 10. When the movable frame 51 is working, it moves out of the fixed frame 10. During the entire working process, it will not come into contact with the worm gear shaft frame 32 and the worm shaft frame 40.

[0060] The movable frame 51 is located below the mounting plate 12 to prevent interference between the two during operation.

[0061] This application uses a worm gear 31 and a worm shaft as a first-stage reduction mechanism. Simultaneously, a gear 30 (a small-module spur gear) is fixed on the worm gear shaft, with a reduction ratio of 1:62. The meshing of gear 30 with the rocker arm 21 forms a second-stage reduction mechanism with a minimum reduction ratio of 1:2. The rocker arm 21, connecting rod 22, and moving frame 51 form a crank-slider mechanism, serving as a third-stage reduction mechanism. The reduction ratio can be changed by altering the crank size and initial crank angle. This application converts the circular motion of the motor into the translational motion of the moving frame through these three stages of reduction. Although the above three-stage reduction mechanism utilizes a worm gear mechanism with a large reduction ratio, the space occupied by the worm gear is still very small due to the fact that the worm gear does not need to rotate a full revolution. Furthermore, by omitting the traditional lead screw structure and reducing one set of linear displacement components, the overall space size is further reduced, resulting in a more compact structure.

[0062] In the three-stage reduction mechanism of this application, the first-stage and second-stage reduction mechanisms are constant reduction ratio transmissions, and the third-stage reduction mechanism is a crank-slider mechanism. The motion characteristics of the moving frame 51 of this mechanism are that the speed and displacement change with the initial crank motion angle, and the motion change law is similar to a sine curve. Therefore, as long as this structural form is used, the speed can be changed by changing the initial position of the crank.

[0063] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fast-response focusing mechanism for a space camera, characterized in that, include: Fixed frame (10), with connecting seats (11) installed at both the top and bottom of the fixed frame. A drive mechanism is disposed on one side of the top of the fixed frame (10); A transmission mechanism, wherein the input end of the transmission mechanism is connected to the output end of the drive mechanism, and the drive mechanism is capable of driving the transmission mechanism to work; A moving mechanism, wherein the input end of the moving mechanism is connected to the output end of the transmission mechanism, and the transmission mechanism is capable of driving the moving mechanism to move; The transmission mechanism includes a worm gear shaft system frame (32) fixed on a fixed frame (10) and an eccentric shaft seat (20) inside the fixed frame (10). The eccentric shaft seat (20) is located above the moving mechanism. The eccentric shaft seat (20) is connected to the middle of the swing arm (21) through an eccentric shaft. One end of the swing arm (21) with a gear meshes with a gear (30). The gear (30) and the worm gear (31) are coaxially arranged and fixed on the worm gear shaft system frame (32), and the worm gear (31) can drive the gear (30) to rotate. The other end of the swing arm (21) is connected to one end of a connecting rod (22) through a rotating shaft. The other end of the connecting rod (22) is connected to the moving mechanism through another rotating shaft.

2. The fast-response space camera focusing mechanism according to claim 1, characterized in that: The fixed frame (10) has a mounting plate in the middle, the eccentric shaft seat (20) is fixed on the mounting plate, the gear (30) is located above the mounting plate, and the moving mechanism is located below the mounting plate.

3. The fast-response space camera focusing mechanism according to claim 1, characterized in that: The connecting rod (22) includes a straight rod (221), and each end of the straight rod (221) has a bearing (222), and the two bearings (222) are rotatably connected to the corresponding rotating shafts.

4. The fast-response space camera focusing mechanism according to claim 3, characterized in that: The straight rod (221) has connecting parts (223) at both ends. The connecting parts (223) are connected to the corresponding bearings (222) to form an integral structure. The connection between the straight rod (221) and the connecting parts (223) is a circular arc transition connection, and the two bearings (222) are located on the same side of the straight rod (221).

5. The fast-response space camera focusing mechanism according to claim 1, characterized in that: A worm gear shaft frame (32) is installed on one side of the fixed frame (10), and the worm gear (31) and the gear (30) are rotatably installed in the worm gear shaft frame (32).

6. The fast-response space camera focusing mechanism according to claim 5, characterized in that: The drive mechanism includes a worm shaft frame (40) located outside the worm wheel shaft frame (32). A motor (41) is installed at one end of the worm shaft frame (40). The output end of the motor (41) drives the worm shaft (42) inside the worm shaft frame (40) to rotate. The worm shaft (42) is meshed with the worm wheel (31).

7. The fast-response space camera focusing mechanism according to claim 1, characterized in that: The moving mechanism includes two guide rails (50) symmetrically arranged in the fixed frame (10), and a moving frame (51) is installed on the two guide rails (50). One end of the moving frame (51) is connected to the corresponding bearing (222) through a rotating shaft, and a focusing component is installed on the moving frame (51).

8. A fast-response space camera focusing mechanism according to claim 7, characterized in that: Each of the guide rails (50) can move along the length direction of the groove (52) on the top surface of the corresponding slider (53). The guide rails (50) are fixedly connected to the moving frame (51), and the two sliders (53) are fixedly connected to the fixed frame (10).

9. A fast-response space camera focusing mechanism according to claim 8, characterized in that: The end of the movable frame (51) protrudes outward to form a boss (54), and the top of the boss (54) is rotatably connected to the corresponding bearing (222) through another rotating shaft. The movable frame (51) is located below the mounting plate (12).

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