A filter switching and holding device

Abstract

The application relates to the technical field of space laser communication, in particular to a filter switching and holding device, which comprises a rotary driving mechanism, a filter assembly and a limiting piece. The rotary driving mechanism is used for driving the filter assembly to rotate and switch. The limiting piece is used for limiting the rotating range of the filter assembly and determining the working position of the filter assembly. The device further comprises a magnetic attraction holding mechanism. The holding mechanism can generate an interaction force with the filter assembly. The interaction force is used for preventing the filter assembly from rebounding away from the limiting piece after the filter assembly collides with the limiting piece, and is used for stably holding the filter assembly at the working position after the rotary driving mechanism is powered off. A rotating mounting position is arranged on the filter assembly. The rotating mounting position is connected with a rotating output shaft of the rotary driving mechanism. The center of gravity of the filter assembly is located on the axis of the rotating output shaft, so that the position holding difficulty of the filter assembly is reduced.

Description

Technical Field

[0001] This invention relates to the field of space laser communication technology, and more specifically to a filter switching and holding device. Background Technology

[0002] In the field of space laser communication technology, incoherent optical communication systems generally use wavelength splitting to achieve beam splitting in the transmitting and receiving paths. Therefore, the same terminal can only transmit at one fixed wavelength and receive at another fixed wavelength. In coherent optical communication systems, the transmitting and receiving paths use polarization splitting. Therefore, by setting up a laser and using a switchable narrowband bandpass filter, the same terminal can switch between two wavelengths at the transmitting and receiving ends, increasing the flexibility of communication link construction.

[0003] In the past, switching mechanisms such as beam divergence angle and self-calibration only required short-term operation. However, the heat generated by keeping the motor powered on for a long time would affect the temperature distribution of the main frame, thereby damaging the positional relationship of components and affecting communication quality. Therefore, they usually use a structure with springs to keep the motor open most of the time.

[0004] Narrowband bandpass filter switching mechanisms need to maintain their current state long-term after switching to any band, making spring-based structures unsuitable. If the motor is powered down directly without design intervention, the motor's load inertial torque will exceed its holding torque during satellite maneuvers, altering the switched position and affecting its reliability. Furthermore, gravity during ground testing increases the difficulty of maintaining the position after power-down. Additionally, the miniaturization requirements of the terminal necessitate the use of stepper motors, but the stepper motor stator windings are not endless; after a collision with the limiting component, the load will be attracted by the nearby windings with a strong magnetic force, posing a risk of deviating from the expected position. Summary of the Invention

[0005] 1. The problem to be solved In view of the problem that the existing narrowband bandpass filter switching mechanism is difficult to maintain its position after power-off and there is a risk of deviation from the expected position during switching, the present invention provides a filter switching and holding device that can stably maintain its working position after power-off and reduce the risk of deviation from the expected position during switching.

[0006] 2. Technical Solution To solve the above problems, the technical solution adopted by the present invention is as follows: A filter switching and holding device includes a rotary drive mechanism, a filter assembly, and a limiting member. The rotary drive mechanism is used to drive the filter assembly to rotate and switch, and the limiting member is used to limit the rotation range of the filter assembly and determine its working position. It also includes a holding mechanism that can generate an interaction force with the filter assembly. This force is used to prevent the filter assembly from rebounding away from the limiting member after it collides with the limiting member, thereby reducing the risk that the filter assembly will be attracted by the nearby winding with a large magnetic force after colliding with the limiting member, causing it to deviate from the expected position. At the same time, this force should be greater than the load torque generated by the satellite's maneuvering angular acceleration to prevent the filter assembly from changing its switched position when the satellite performs maneuvering angular acceleration. That is, after the rotary drive mechanism is powered down, the filter assembly is kept stably in the working position. This force should also be less than the motor's rotational torque so that the rotary drive mechanism can normally drive the filter assembly to rotate and switch positions.

[0007] The filter assembly includes a rotating mounting position connected to the rotating output shaft of a rotating drive mechanism. The vertical distance between the center of gravity of the filter assembly and the axis of the rotating output shaft is less than 5 mm. Preferably, the center of gravity of the filter assembly is located on the axis of the rotating output shaft. In this case, gravity will not cause torque on the filter assembly around the rotating output shaft, and the filter assembly will not rotate due to its own weight at any angle. This essentially eliminates the torque required to counteract gravitational torque, which helps maintain the static balance of the filter assembly and reduces the difficulty of maintaining its position. When the center of gravity is on the axis of the rotating output shaft, the mass of the filter assembly is also closer to the axis, resulting in a smaller moment of inertia. This helps reduce the load torque generated by the satellite's maneuvering angular acceleration, further reducing the difficulty of maintaining the position of the filter assembly.

[0008] As a preferred embodiment of the present invention, the limiting member is provided with limiting part one and limiting part two, and the filter assembly is provided with limiting part three and limiting part four; when limiting part one abuts against limiting part three, the filter assembly is in a first working position, and when limiting part two abuts against limiting part four, the filter assembly is in a second working position.

[0009] As a preferred embodiment of the present invention, the limiting member is disposed between the limiting part three and the limiting part four, and the limiting part one and the limiting part two are respectively disposed on both sides of the limiting member.

[0010] As a preferred embodiment of the present invention, the retaining mechanism includes two sets of magnetic components, each set of magnetic components including a magnetic element one and a magnetic element two, and there is an attraction between the magnetic element one and the magnetic element two; Two magnetic components are respectively installed on the first and second limiting parts, and two magnetic components are respectively installed on the third and fourth limiting parts.

[0011] As a preferred embodiment of the present invention, the first magnetic component is a magnet, and the second magnetic component is a steel sheet with magnets.

[0012] As a preferred embodiment of the present invention, the filter assembly or the limiting member is provided with an isolation part to prevent the magnetic steel sheet from directly colliding with the magnet when the filter assembly and the limiting member come into contact.

[0013] As a preferred embodiment of the present invention, the magnet is embedded in the limiting member, and the surface of the magnet is lower than the corresponding surface of the limiting member.

[0014] As a preferred embodiment of the present invention, the filter assembly includes a lens mount; Two filters are installed on the lens mount, both of which are filters corresponding to the receiving end; or, four filters are installed on the lens mount, two of which are filters corresponding to the receiving end and the remaining two are filters corresponding to the transmitting end, and the two filters corresponding to the receiving end are installed on the same side of the lens mount, and the two filters corresponding to the transmitting end are installed on the same side of the lens mount.

[0015] As a preferred embodiment of the present invention, the filter is installed in the mounting groove on the lens mount, and the side of the mounting groove is provided with an adhesive injection groove.

[0016] As a preferred embodiment of the present invention, the rotating mounting position is set as the shaft hole of the mirror base, and the mirror base is also provided with a through hole perpendicular to the shaft hole, and a screw for fixing the rotating output shaft in the shaft hole is installed in the through hole. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the filter switching and holding device in this invention when four filters are provided; Figure 2 This is a schematic diagram of the structure of the filter switching and holding device in this invention when two filters are provided; Figure 3 for Figure 1 Schematic diagram of the structure of the intermediate filter assembly; Figure 4 for Figure 1 Schematic diagram of the middle limiting component; Figure 5 for Figure 1 A schematic diagram of the rotating drive mechanism.

[0018] Explanation of the labels in the diagram: 100. Rotary drive mechanism; 110. Rotary output shaft; 120. Motor; 130. Motor mount; 140. Limiting interface; 200, Filter assembly; 210, Rotating mounting position; 220, Limiting part three; 230, Limiting part four; 240, Lens mount; 250, Filter; 260, Mounting groove; 270, Adhesive injection groove; 280, Through hole; 300. Limiting component; 310. Limiting part one; 320. Limiting part two; 400. Holding mechanism; 410. Magnetic component one; 420. Magnetic component two. Detailed Implementation

[0019] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0020] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0021] Example 1 This embodiment provides a filter switching and holding device, such as... Figures 1-5 As shown, it includes a rotary drive mechanism 100, a filter assembly 200, a limiting member 300, and a holding mechanism 400.

[0022] The filter assembly 200 includes a rotatable mounting position 210, which is connected to the rotation output shaft 110 of the rotary drive mechanism 100. The rotary drive mechanism 100 can drive the filter assembly 200 to rotate and switch. When the filter assembly 200 rotates and switches, the limiting member 300 is used to limit the rotation range of the filter assembly 200 and determine its working position. When the filter assembly 200 rotates to the point of contact with the limiting member 300, it indicates that the filter assembly 200 has reached the working position, and at the same time, the limiting member 300 also prevents the filter assembly 200 from continuing to rotate.

[0023] The retaining mechanism 400 is designed to generate an interaction force with the filter assembly 200, such as magnetic attraction, frictional force hindering movement, thrust, or pull. This force prevents the filter assembly 200 from rebounding away from the retaining member 300 after it collides with the retaining member 300, thus reducing the risk of the filter assembly 200 being attracted by a nearby winding with a large magnetic force after colliding with the retaining member 300, causing it to deviate from its intended position. Simultaneously, this force should be greater than the load torque generated by the satellite's maneuvering angular acceleration to prevent the filter assembly 200 from changing its switched position when the satellite performs maneuvering angular acceleration. This ensures that the filter assembly 200 remains stably in its working position after the rotary drive mechanism 100 is powered down. Furthermore, this force should be less than the motor's rotational torque to ensure that the rotary drive mechanism 100 can normally drive the filter assembly 200 to rotate and switch positions.

[0024] The perpendicular distance between the center of gravity of the filter assembly 200 and the axis of the rotating output shaft 110 is less than 5 mm, for example, it can be 4 mm, 3 mm, 0.5 mm, 0.1 mm, etc. Preferably, the center of gravity of the filter assembly 200 is located on the axis of the rotating output shaft 110. At this time, gravity will not cause torque on the filter assembly 200 around the rotating output shaft 110, and the filter assembly 200 will not rotate due to its own gravity at any angle. This essentially eliminates the torque required to counteract the gravitational torque, which is beneficial to maintaining the static balance of the filter assembly 200 and reducing the difficulty of maintaining the position of the filter assembly 200. When the center of gravity is on the axis of the rotating output shaft 110, the mass of the filter assembly 200 is also closer to the axis, making the moment of inertia of the filter assembly 200 smaller. This is beneficial to reducing the load torque generated by the satellite maneuvering angular acceleration and further reducing the difficulty of maintaining the position of the filter assembly 200.

[0025] In this embodiment, the filter switching and holding device realizes the switching of narrowband bandpass filters and the power-down holding function after switching, which reduces the unnecessary waste and pressure caused by the long-term power-on of the motor to the system power consumption and heat dissipation. In addition, it realizes the switching function of two bands at the same terminal transmitter and receiver, and increases the flexibility of communication link construction.

[0026] Example 2 Based on the above embodiments, the filter assembly 200 in this embodiment includes a lens mount 240 for fixing multiple filters 250, which pass through different wavelengths. Specifically, the lens mount 240 is provided with a mounting groove 260 for mounting the filters 250, and a glue injection groove 270 is provided on the side of the mounting groove 260. The glue injection groove 270 is connected to the mounting groove 260. After the filters 250 are placed into the mounting groove 260, glue is injected into the glue injection groove 270 to bond and fix the filters 250 in the mounting groove 260. The lens mount 240 and the multiple filters 250 are designed for balance, so that the overall center of gravity of the filter assembly 200 is positioned at the center of the rotating mounting position 210, that is, on the axis of the rotating output shaft 110.

[0027] The rotating mounting position 210 is set as the shaft hole of the lens base 240. The rotating output shaft 110 is engaged with the shaft hole to ensure a certain assembly accuracy, so that the center of gravity of the filter assembly 200 is more reliably placed on the axis of the rotating output shaft 110. The lens base 240 is also provided with a through hole 280 perpendicular to the shaft hole. The through hole 280 has a threaded structure and screws or set screws for fixing the rotating output shaft 110 in the shaft hole are installed in the through hole 280.

[0028] In practice, filter 250 can be configured as two or four. For example... Figure 2 As shown, when only two filters 250 are configured, both filters 250 are filters 250 corresponding to the receiving end. Preferably, the two filters 250 are located on the same side of the lens mount 240 and are closely adjacent to each other, reducing the difficulty of center of gravity balancing. Figure 1 As shown, when four filters 250 are configured, two are filters 250 corresponding to the receiving end, and the remaining two are filters 250 corresponding to the transmitting end. Preferably, the two filters 250 corresponding to the receiving end are mounted on the same side of the lens mount 240, and the two filters 250 corresponding to the transmitting end are mounted on the same side of the lens mount 240, with the left and right filters 250 arranged substantially symmetrically. In use, the four filters 250 are divided into two groups: the lower left filter 250 and the upper right filter 250 form one group, and the upper left filter 250 and the lower right filter 250 form another group. Figure 1 In the middle, the filter 250 in the lower left and the filter 250 in the upper right are in the working position. By rotating and switching, the filter 250 in the upper left and the filter 250 in the lower right are switched to the working position, that is, the filter 250 in the upper left moves to the current position of the filter 250 in the lower left, and the filter 250 in the lower right moves to the current position of the filter 250 in the upper right.

[0029] Example 3 Based on the above embodiments, in this embodiment, the rotary drive mechanism 100 includes a motor 120, the rotation output shaft 110 of the rotary drive mechanism 100 is set as a motor shaft, a motor base 130 for fixing the motor is provided on the motor, and the limiting member 300 is fixedly installed on the limiting interface 140 on the motor base by screws.

[0030] The limiting member 300 is provided with a limiting part 310 and a limiting part 320. Preferably, the limiting part 310 and the limiting part 320 are two surfaces of the limiting member 300 itself. The filter assembly 200 is provided with a limiting part 220 and a limiting part 230. Preferably, the limiting part 220 and the limiting part 230 are disposed on the lens mount 240, and the limiting part 220 and the limiting part 230 are two surfaces of the lens mount 240 itself.

[0031] The limiting member 300 is disposed between the limiting part three 220 and the limiting part four 230. The limiting part one 310 and the limiting part two 320 are respectively disposed on both sides of the limiting member 300. All four limiting parts are located on the same rotation radius. When the limiting part one 310 abuts against the limiting part three 220, the filter assembly 200 is in the first working position. When the limiting part two 320 abuts against the limiting part four 230, the filter assembly 200 is in the second working position.

[0032] By placing the limiting member 300 between the limiting part 320 and the limiting part 4230, and placing the limiting part 1 310 and the limiting part 2 320 on both sides of the limiting member 300, the filter assembly 200 can be switched between two working positions by controlling the limiting part 320 and the limiting part 1 310 to collide or the limiting part 4 230 and the limiting part 2 320 to collide by rotating the filter assembly 200 forward and backward.

[0033] Example 4 Based on the above embodiments, the retaining mechanism 400 in this embodiment includes two sets of magnetic attraction components. Each set of magnetic attraction components includes a first magnetic element 410 and a second magnetic element 420. Optionally, the first magnetic element 410 is a magnet, and the second magnetic element 420 is a steel sheet with a magnet. The two first magnetic elements 410 are respectively installed on the first limiting part 310 and the second limiting part 320, and the two second magnetic elements 420 are respectively installed on the third limiting part 220 and the fourth limiting part 230. There is an attraction between the first magnetic element 410 and the second magnetic element 420. When the first limiting part 310 abuts against the third limiting part 220 or the second limiting part 320 abuts against the fourth limiting part 230, the corresponding first magnetic element 410 and second magnetic element 420 attract each other. This attraction is greater than the load torque generated by the satellite maneuvering angular acceleration and less than the motor rotation torque.

[0034] Because magnets are relatively brittle, the filter assembly 200 or the limiting member 300 is provided with an isolation portion to prevent the magnetic steel sheet from directly colliding with the magnet when the filter assembly 200 and the limiting member 300 come into contact. Preferably, the magnet is embedded in the limiting member 300, and the surface of the magnet is lower than the corresponding surface of the limiting member 300. In this case, the isolation portion is configured on the surfaces where the first limiting part 310 and the second limiting part 320 are located. It should be noted that the distance between the surface of the magnet and the surface of the limiting member 300 should be reasonably controlled to avoid the magnetic attraction between the first magnetic part 410 and the second magnetic part 420 being too weak due to a large distance. Furthermore, since the limiting member 300 will be subjected to the impact force of the magnetic steel sheet, the limiting member 300 is made of a material with low hardness such as polyimide to improve the service life of the magnetic steel sheet.

[0035] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A filter switching and holding device, comprising a rotary drive mechanism (100), a filter assembly (200), and a limiting member (300), wherein the rotary drive mechanism (100) is used to drive the filter assembly (200) to rotate and switch, and the limiting member (300) is used to limit the rotation range of the filter assembly (200) and determine its working position; Its features are: It also includes a holding mechanism (400) that can generate an interaction force with the filter assembly (200), which is used to prevent the filter assembly (200) from rebounding away from the limiter (300) after the filter assembly (200) collides with the limiter (300), and to keep the filter assembly (200) stably in the working position after the rotary drive mechanism (100) is powered off; The filter assembly (200) is provided with a rotating mounting position (210), which is connected to the rotating output shaft (110) of the rotating drive mechanism (100), and the center of gravity of the filter assembly (200) is located on the axis of the rotating output shaft (110) to reduce the difficulty of maintaining the position of the filter assembly (200). The limiting member (300) is provided with a limiting part one (310) and a limiting part two (320), and the filter assembly (200) is provided with a limiting part three (220) and a limiting part four (230); when the limiting part one (310) abuts against the limiting part three (220), the filter assembly (200) is in a first working position, and when the limiting part two (320) abuts against the limiting part four (230), the filter assembly (200) is in a second working position; Only one limiting member (300) is provided. The limiting member (300) is provided between the limiting part three (220) and the limiting part four (230). The limiting part one (310) and the limiting part two (320) are respectively provided on both sides of the limiting member (300). The limiting part one (310) and the limiting part two (320) are two surfaces of the limiting member (300) itself. The retaining mechanism (400) includes two sets of magnetic components, each set of magnetic components including a first magnetic element (410) and a second magnetic element (420), and there is an attraction between the first magnetic element (410) and the second magnetic element (420); Two magnetic components 1 (410) are respectively installed on limiting part 1 (310) and limiting part 2 (320), and two magnetic components 2 (420) are respectively installed on limiting part 3 (220) and limiting part 4 (230); The magnetic element (410) is embedded in the limiting element (300), and the surface of the magnetic element (410) is lower than the corresponding surface of the limiting element (300); The limiting member (300) and the magnetic member (410) are offset from the rotation center of the filter assembly (200).

2. The filter switching and holding device according to claim 1, characterized in that: The filter assembly (200) includes a lens mount (240); Two filters (250) are installed on the lens mount (240), both filters (250) are filters (250) corresponding to the receiving end; or, four filters (250) are installed on the lens mount (240), two of which are filters (250) corresponding to the receiving end, and the remaining two are filters (250) corresponding to the transmitting end, and the two filters (250) corresponding to the receiving end are installed on the same side of the lens mount (240), and the two filters (250) corresponding to the transmitting end are installed on the same side of the lens mount (240).

3. The filter switching and holding device according to claim 2, characterized in that: The filter (250) is installed in the mounting groove (260) on the lens mount (240), and the mounting groove (260) is provided with a glue injection groove (270) on the side. The rotating mounting position (210) is set as the shaft hole of the mirror base (240), and the mirror base (240) is also provided with a through hole (280) perpendicular to the shaft hole. A screw for fixing the rotating output shaft (110) in the shaft hole is installed in the through hole (280).

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