Two-dimensional mirror system and optical imaging system

Abstract

This invention discloses a two-dimensional reflector system and an optical imaging system. The two-dimensional reflector system includes a four-bar linkage, an azimuth drive mechanism, a linear drive mechanism, and a control module. The four-bar linkage includes a support base, a reflector assembly, a transmission link, and a transmission ring. The reflector assembly is oscillatingly mounted on the support base and constrained to rotate and oscillate around an X-axis perpendicular to the Y-axis. The first end of the transmission link is hinged to the reflector assembly at a position offset from the X-axis. The inner wall of the transmission ring mates with the outer wall of the support base and is hinged to the second end of the transmission link. The output end of the azimuth drive mechanism is connected to the support base and is used to drive the four-bar linkage to rotate 360 ​​degrees around the Y-axis. The output end of the linear drive mechanism is connected to the transmission ring and is used to drive the reflector assembly to rotate and oscillate around the X-axis. This invention solves the problems of large size, heavy weight, slow deflection speed, and insufficient imaging stability in existing two-dimensional reflector systems.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to a two-dimensional mirror system and an optical imaging system. Background Technology

[0002] Two-dimensional mirrors, as a key technology for large-area high-definition imaging, can effectively expand the field of view of an object and achieve real-time correction of the image captured by the rear camera through X and Y axis linkage control, thereby restoring the true optical information of the controlled object area. Currently, mainstream two-dimensional mirror systems generally adopt traditional mechanical axis structures, whose working principle relies on driving the entire mechanical axis to deflect the mirror. While this design has the advantage of a wide field of view, it has several significant drawbacks: the overall system structure is bulky, resulting in excessive installation space requirements; the unreasonable weight distribution of the device causes a significant increase in rotational inertia, severely restricting the deflection response speed of the mirror; at the same time, the numerous internal components and complex connections of the mechanical axis system not only require extremely stringent precision during assembly but also significantly increase the difficulty and cost of daily maintenance; more importantly, during high-speed deflection operations, the system is prone to mechanical vibration, directly interfering with the stability and clarity of optical imaging. Taking PTZ cameras, widely used in the surveillance industry, as an example, the entire camera system must be driven to rotate along a mechanical track. Due to its large overall mass, the moment of inertia is difficult to reduce effectively, fundamentally limiting its rapid response capability. These technical bottlenecks collectively make it difficult for existing two-dimensional mirror systems to meet the comprehensive requirements of modern optical applications for high-speed tracking, high-precision imaging, and compact structures. Therefore, existing technologies urgently need improvement to address these issues. Summary of the Invention

[0003] To address the shortcomings of the existing technologies, this invention provides a two-dimensional mirror system and an optical imaging system to solve the problems of large size, heavy weight, slow deflection speed, and insufficient imaging stability in existing two-dimensional mirror systems.

[0004] This invention is achieved using the following technical solution:

[0005] A two-dimensional mirror system, comprising:

[0006] A four-bar linkage includes a support base, a reflector assembly, a transmission link, and a transmission ring. The support base has a Y-axis extending vertically. The reflector assembly is oscillatingly mounted on the support base and constrained to rotate about an X-axis perpendicular to the Y-axis. The first end of the transmission link is hinged to the reflector assembly at a position offset from the X-axis. The inner wall of the transmission ring mates with the outer wall of the support base and is hinged to the second end of the transmission link.

[0007] The orientation drive mechanism has its output end connected to the support base;

[0008] A linear drive mechanism, the output end of which is connected to a transmission ring;

[0009] The control module is communicatively connected to the orientation drive mechanism and the linear drive mechanism, and is used to receive instructions and coordinate the actions of both.

[0010] The azimuth drive mechanism is used to drive the support base and the reflector assembly, transmission link and transmission ring mounted thereon to rotate 360 ​​degrees around the Y-axis. The linear drive mechanism is used to drive the transmission ring to reciprocate linearly along a direction parallel to the Y-axis, thereby driving the reflector assembly to rotate and swing around the X-axis.

[0011] Furthermore, it also includes a bearing and a movable seat, wherein the inner ring of the bearing is fixedly fitted with the outer wall of the transmission ring, the outer ring of the bearing is fixedly fitted with the movable seat, and the movable seat is connected to the output end of the linear drive mechanism.

[0012] Furthermore, the inner ring of the bearing is interference-fitted with the outer wall of the transmission ring.

[0013] Furthermore, the movable seat has an annular through hole and two oppositely arranged connecting parts, the outer ring of the bearing is fixedly fitted with the inner wall of the annular through hole, and the two connecting parts are respectively connected to a linear drive mechanism.

[0014] Furthermore, the linear drive mechanism is a miniature electric actuator.

[0015] Furthermore, the orientation drive mechanism is an electric rotary table, and the support base is connected to the rotating part of the electric rotary table.

[0016] Furthermore, the two opposite sides of the reflector assembly are respectively hinged to the support base via rotating shafts, and the two rotating shafts are coaxially arranged, with their axes forming the X-axis.

[0017] Furthermore, the reflector assembly includes a frame for mounting reflector lenses. The frame has two oppositely arranged sides. The support base is provided with upwardly extending hinge lugs corresponding to the positions of the two sides. The hinge lugs are provided with shaft holes. The sides are provided with mating hinge holes. The rotating shaft passes through the shaft hole and the hinge hole.

[0018] An optical imaging system includes the aforementioned two-dimensional mirror system and an imaging device. The imaging device is disposed below the two-dimensional mirror system. A light transmission channel for light to pass through is provided inside the support base. The reflective surface of the mirror assembly is located above the light transmission channel. The reflective surface of the mirror assembly is configured to receive an incident light beam and reflect it into an outgoing light beam in the same direction as the Y-axis. The outgoing light beam passes through the light transmission channel of the support base and is received by the imaging device.

[0019] Furthermore, the light transmission channel is arranged along the Y-axis of the support base.

[0020] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0021] The two-dimensional reflector system of this invention utilizes a four-bar linkage consisting of a support base, a reflector assembly, a transmission link, and a transmission ring, coordinated with an azimuth drive mechanism and a linear drive mechanism for coordinated control, achieving two-dimensional oscillation of the reflector assembly. The azimuth drive mechanism is responsible for the overall 360-degree azimuth rotation of the support base and the assembly mounted thereon around the Y-axis, thereby enabling arbitrary 360° one-dimensional angle adjustment of the reflector assembly. The pitch oscillation of the reflector assembly is achieved by the linear drive mechanism driving the transmission ring linearly, which is then indirectly driven by the transmission link. This design allows only the reflector assembly and its directly related transmission components to oscillate at high speed, without needing to drive the entire heavy device. Since this system only drives relatively lightweight components such as the reflector assembly, transmission link, and transmission ring to oscillate, and importantly, when achieving pitch oscillation, the system uses a linear drive mechanism to drive the transmission ring in linear reciprocating motion, converting the linear motion into rotational oscillation of the reflector assembly around the X-axis via the transmission link. This four-bar linkage transmission mechanism avoids the complex gear or belt drives found in existing mechanical shaft systems, resulting in a more compact structure and a reduced number of components. Therefore, this system effectively reduces the overall weight and rotational inertia of moving parts, thereby significantly improving the deflection speed of the mirror assembly. Simultaneously, due to the reduced inertia, the system achieves faster deflection speeds and lower inertia, maintaining greater stability during high-speed motion and reducing the impact of vibration on image quality. This collaborative working method enables the system to efficiently complete large-scale, high-precision two-dimensional scanning tasks; furthermore, the mechanism design simplifies the assembly process and reduces maintenance complexity and cost. This system achieves high-speed, high-precision, and high-stability two-dimensional beam control through lightweight moving parts and ingenious mechanical transmission design, overcoming the problems of large size, heavy weight, slow deflection speed, and insufficient imaging stability in existing technologies. Attached Figure Description

[0022] Figure 1This is a three-dimensional schematic diagram of a two-dimensional reflector system according to an embodiment of the present invention;

[0023] Figure 2 This is one of the cross-sectional views of the two-dimensional mirror system according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a two-dimensional reflector system according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the optical path of an optical imaging system according to an embodiment of the present invention;

[0026] In the diagram: 11. Support base; 110. Hinge lug; 111. Light transmission channel; 12. Reflector assembly; 13. Transmission link; 14. Transmission ring; 2. Orientation drive mechanism; 3. Linear drive mechanism; 4. Bearing; 5. Moving base; 51. Connecting part; 6. Shooting equipment. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0028] The terms used to express position and direction in this invention are illustrated with reference to the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0029] like Figures 1 to 3 As shown, the present invention provides a two-dimensional reflector system, comprising:

[0030] The four-bar linkage includes a support base 11, a reflector assembly 12, a transmission link 13, and a transmission ring 14. The support base 11 has a Y-axis extending vertically. The reflector assembly 12 is oscillatingly mounted on the support base 11 and constrained to rotate about an X-axis perpendicular to the Y-axis. The first end of the transmission link 13 is hinged to the reflector assembly 12 at a position offset from the X-axis. The inner wall of the transmission ring 14 mates with the outer wall of the support base 11 and is hinged to the second end of the transmission link 13.

[0031] The orientation drive mechanism 2 has its output end connected to the support base 11;

[0032] The linear drive mechanism 3 has its output end connected to the transmission ring 14;

[0033] The control module is communicatively connected to the orientation drive mechanism 2 and the linear drive mechanism 3, and is used to receive instructions and coordinate the actions of the two.

[0034] The orientation drive mechanism 2 is used to drive the support base 11 and the reflector assembly 12, transmission link 13 and transmission ring 14 mounted thereon to rotate 360 ​​degrees around the Y-axis. The linear drive mechanism 3 is used to drive the transmission ring 14 to reciprocate linearly along a direction parallel to the Y-axis, thereby driving the reflector assembly 12 to rotate and swing around the X-axis.

[0035] In this embodiment, the transmission link 13 can be a rigid rod, one end of which is connected to the side or bottom of the reflector assembly 12 via a ball joint hinge or pin hinge, ensuring effective force transmission when the reflector assembly 12 swings. A certain distance exists between this connection point and the X-axis to create a lever arm, thereby driving the reflector assembly 12 to rotate when the transmission link 13 moves. The transmission ring 14 can be an annular component fitted outside the support base 11, with its inner wall and the outer wall of the support base 11 using a sliding or rolling fit, allowing the transmission ring 14 to move along the Y-axis. The second end of the transmission link 13 is connected to the transmission ring 14 via a hinge, for example, via a pin, so that the linear movement of the transmission ring 14 can be converted into the swinging of the transmission link 13. The orientation drive mechanism 2 drives the four-bar linkage to rotate 360 ​​degrees around the Y-axis, achieving horizontal scanning of the target area. When the linear drive mechanism 3 operates, its output end drives the transmission ring 14 to reciprocate linearly in a direction parallel to the Y-axis. This linear movement, connected by the transmission link 13, drives the reflector assembly 12 to rotate and swing around the X-axis, achieving vertical scanning of the target area. The control module communicates with the orientation drive mechanism 2 and the linear drive mechanism 3. This control module can be a microcontroller or embedded system, receiving external commands, such as those from an operator or host computer, via wired or wireless means. Based on the received commands, the control module precisely controls the actions of the orientation drive mechanism 2 and the linear drive mechanism 3, including their start, stop, speed, and position, thereby coordinating them to achieve precise two-dimensional control of the reflector assembly 12, ensuring that the reflector points in the preset direction.

[0036] This two-dimensional mirror system has two rotational axes (Y-axis and X-axis). The mirror assembly 12 rotates around the Y-axis and X-axis primarily through a four-bar linkage, an orientation drive mechanism 2, and a linear drive mechanism 3. The specific motion process is as follows:

[0037] When the four-bar linkage deflects around the Y-axis, the control module issues a rotation command. At this time, the components of the four-bar linkage remain relatively stationary. The orientation drive mechanism 2 drives the support base 11 to rotate to the designated position. Since the reflector assembly 12 is one of the components of the four-bar linkage, the reflector assembly 12 synchronously rotates 360° around the Y-axis of the support base 11, thereby realizing the one-dimensional angle arbitrarily adjustable 360° of the reflector assembly 12.

[0038] When oscillating around the X-axis: When the linear drive mechanism 3 receives the instruction from the control module to perform up-and-down reciprocating motion, it drives the transmission ring 14 to perform reciprocating linear motion in the vertical direction, causing the four-bar linkage to move, and then driving the reflector assembly 12 to rotate and oscillate around the X-axis. By controlling the stroke accuracy of the linear drive mechanism 3, the horizontal deflection accuracy can be adjusted.

[0039] Composite motion: Through the coordinated control of the linear drive mechanism 3 and the azimuth drive mechanism 2 by the control module, the reflector assembly 12 can rotate simultaneously along the Y-axis and the X-axis, thereby realizing high-speed and precise pointing tracking of the two-dimensional tilting mirror.

[0040] The specific application scenario of the two-dimensional reflector system in this embodiment is as follows: When a rapid scan of a specific area is required, the control module receives a scan command. First, the orientation drive mechanism 2 is activated, and its output end is connected to the support base 11, driving the four-bar linkage (the entire support base 11 and the reflector assembly 12, transmission link 13, and transmission ring 14 mounted on it) to rotate 360 ​​degrees around the Y-axis. For example, when a horizontal scan from east to west is required, the orientation drive mechanism 2 will drive the support base 11 to rotate at a preset speed and angle, causing the horizontal orientation of the reflector assembly 12 to change. At the same time, or after the orientation rotation is completed, the linear drive mechanism 3 is activated by the control module. The output end of the linear drive mechanism 3 is connected to the transmission ring 14, driving the transmission ring 14 to reciprocate linearly along a direction parallel to the Y-axis. For example, when a vertical pitch scan is required, the linear drive mechanism 3 will drive the transmission ring 14 to move up or down. Because the transmission ring 14 is hinged to the second end of the transmission link 13, and the first end of the transmission link 13 is hinged to the reflector assembly 12 at a position offset from the X-axis, the linear movement of the transmission ring 14 will drive the reflector assembly 12 to rotate and swing around the X-axis through the swing of the transmission link 13. For example, when the transmission ring 14 moves upward, the transmission link 13 will push or pull the connection point of the reflector assembly 12 upward, causing the reflector assembly 12 to deflect upward or downward around the X-axis. Through the coordinated control of the positioning drive mechanism 2 and the linear drive mechanism 3 by the control module, the reflector assembly 12 can achieve rapid and precise two-dimensional orientation adjustment. For example, when it is necessary to quickly switch from one target point to another, the control module will simultaneously calculate and instruct the two drive mechanisms to operate with the optimal path and speed.

[0041] This embodiment introduces a four-bar linkage consisting of a support base 11, a reflector assembly 12, a transmission link 13, and a transmission ring 14, and coordinates it with an azimuth drive mechanism 2 and a linear drive mechanism 3 for coordinated control, thereby achieving two-dimensional oscillation of the reflector assembly 12. The azimuth drive mechanism 2 is responsible for the overall 360-degree azimuth rotation of the support base 11 and the components mounted on it around the Y-axis, thus enabling arbitrary 360° one-dimensional angle adjustment of the reflector assembly 12. The pitch oscillation of the reflector assembly 12 is achieved by the linear drive mechanism 3 driving the transmission ring 14 linearly, which is then indirectly driven by the transmission link 13. This design allows only the reflector assembly 12 and its directly related transmission components to oscillate at high speed, without needing to drive the entire heavy device. Since this system only drives relatively lightweight components such as the reflector assembly 12, transmission link 13, and transmission ring 14 to oscillate, and importantly, when achieving pitch oscillation, the system uses the linear drive mechanism 3 to drive the transmission ring 14 in linear reciprocating motion, and the transmission link 13 converts the linear motion into the rotational oscillation of the reflector assembly 12. This four-bar linkage transmission mechanism avoids the complex gear or belt drives found in existing mechanical shaft systems, resulting in a more compact structure and fewer components. Consequently, the system effectively reduces the overall weight and moment of inertia of the moving parts, significantly improving the deflection speed of the mirror assembly 12. Simultaneously, the reduced moment of inertia allows for faster deflection speeds and lower inertia, maintaining greater stability at high speeds and minimizing the impact of vibration on image quality. This collaborative working method enables the system to efficiently complete large-scale, high-precision two-dimensional scanning tasks. Furthermore, the mechanism design simplifies the assembly process and reduces maintenance complexity and costs. This high-speed, high-precision, and high-stability two-dimensional beam control, achieved through lightweight moving parts and ingenious mechanical transmission design, overcomes the problems of large size, heavy weight, slow deflection speed, and insufficient imaging stability found in existing technologies.

[0042] In a preferred embodiment, the system further includes a bearing 4 and a movable seat 5. The inner ring of the bearing 4 is fixedly fitted to the outer wall of the transmission ring 14, and the outer ring of the bearing 4 is fixedly fitted to the movable seat 5. The movable seat 5 is connected to the output end of the linear drive mechanism 3.

[0043] In this embodiment, the connection between the linear drive mechanism 3 and the transmission ring 14 is optimized by setting the bearing 4 and the movable seat 5. Specifically, the output end of the linear drive mechanism 3 is first connected to the movable seat 5, transmitting the thrust or pull force generated by the linear drive mechanism 3 to the movable seat 5. The movable seat 5, as an intermediate load-bearing component, has a stable structure and can withstand the driving force from the linear drive mechanism 3. The outer ring of the bearing 4 is fixedly fitted to the movable seat 5, so that the linear movement of the movable seat 5 can directly drive the outer ring of the bearing 4 to move vertically. Since the inner ring of the bearing 4 is fixedly fitted to the outer wall of the transmission ring 14, when the bearing 4 moves linearly under the drive of the movable seat 5, its inner ring will move synchronously, thereby smoothly and accurately transmitting the motion of the linear drive mechanism 3 to the transmission ring 14. The bearing 4 plays a key guiding and friction-reducing role in this process. It allows relative movement between the inner and outer rings, while ensuring the synchronicity of movement and the stability of transmission through the fixed fit between its inner and outer rings and the transmission ring 14 and the movable seat 5. This indirect connection method effectively avoids problems such as excessive friction, difficulty in centering, and radial load effects that may result from direct connection between the output end of the linear drive mechanism 3 and the transmission ring 14, ensuring the smoothness, stability, and high precision of the transmission ring 14 when it reciprocates linearly along the Y-axis.

[0044] Specifically, the inner ring of the bearing 4 is interference-fitted with the outer wall of the transmission ring 14. This interference fit ensures a gapless, high-rigidity connection between the bearing 4 and the transmission ring 14. When the linear drive mechanism 3 drives the moving seat 5 to reciprocate linearly along a direction parallel to the Y-axis, the movement of the moving seat 5 is precisely transmitted to the bearing 4 through its fixed fit with the outer ring of the bearing 4. Because of the interference fit between the inner ring of the bearing 4 and the outer wall of the transmission ring 14, the inner ring of the bearing 4 can transmit this linear motion to the transmission ring 14 without loss or lag, thereby driving the transmission ring 14 to move precisely in a reciprocating linear direction along the Y-axis. This tight fit avoids the slight gaps or looseness that may exist in traditional fixing methods, ensuring the continuity and accuracy of motion transmission, and thus guaranteeing the accuracy and stability of the rotating and oscillating motion of the reflector assembly 12 around the X-axis.

[0045] In a preferred embodiment, the movable seat 5 has an annular through hole and two oppositely arranged connecting parts 51. The outer ring of the bearing 4 is fixedly fitted with the inner wall of the annular through hole, and the two connecting parts 51 are respectively connected to a linear drive mechanism 3.

[0046] In this embodiment, by designing the movable seat 5 with an annular through hole and fixing the outer ring of the bearing 4 to the inner wall of the annular through hole, the stable installation and concentricity of the bearing 4 inside the movable seat 5 are ensured, providing a reliable foundation for the smooth rotation and linear movement of the transmission ring 14. Furthermore, the movable seat 5 is provided with two oppositely arranged connecting parts 51, and each of these connecting parts 51 is connected to a linear drive mechanism 3. When the control module issues a command, the two linear drive mechanisms 3 operate synchronously or in coordination, jointly driving the movable seat 5 to reciprocate linearly along a direction parallel to the Y-axis. Since the driving force is applied through the two oppositely arranged connecting parts 51, the torque experienced by the movable seat 5 during movement is effectively balanced, thereby significantly reducing the possibility of the movable seat 5 tilting, jamming, or swaying. This balanced drive mechanism ensures the smooth and precise linear movement of the movable seat 5, and then, through the bearing 4 and the transmission ring 14, this high-precision linear movement is converted into a high-precision rotational oscillation of the reflector assembly 12 around the X-axis. In this way, this application effectively solves the problem of unstable movement of the moving seat 5 that may be caused by a single driving point, and greatly improves the accuracy of the swing angle of the reflector assembly 12 and the overall stability of the system.

[0047] In a preferred embodiment, the linear drive mechanism 3 is a miniature electric push rod.

[0048] In this embodiment, the miniature electric actuator is an electric drive device that converts the rotational motion of an electric motor into the linear reciprocating motion of a actuator. It features fast response (able to quickly respond to control signals) and low noise (compared to pneumatic or hydraulic systems, the electric actuator operates with lower noise). Because the electric actuator can provide a stable linear push-pull force, it can provide a stable and controllable driving force for the movement of the transmission ring 14, allowing for precise control of the displacement of the transmission ring 14. This, in turn, precisely drives the reflector assembly 12 to swing around the X-axis via the transmission link 13. This effectively solves the problems of insufficient precision, slow response, or unstable driving that may exist in the general linear drive mechanism 3, ensuring the stability and reliability of the two-dimensional reflector system in various application scenarios.

[0049] In a preferred embodiment, the orientation drive mechanism 2 is an electric rotary table, and the support base 11 is connected to the rotating part of the electric rotary table.

[0050] In this embodiment, the electric rotary table is a device that achieves precise angular positioning and continuous rotation through motor drive. It typically includes a rotating platform, a drive motor (such as a stepper motor or servo motor), a reduction mechanism (such as a worm gear or gear set), and an encoder or limit switch for position feedback and control. The electric rotary table can be driven by a stepper motor, controlling the rotation angle by precisely controlling the number of pulses from the stepper motor. Alternatively, a servo motor can be used, combined with a high-resolution encoder to achieve closed-loop control, providing higher rotational speed, acceleration, and positioning accuracy, suitable for scenarios with high dynamic response requirements. The rotating part is the rotatable portion of the electric rotary table, typically a circular platform or flange. The support base 11 is connected to this rotating part, meaning that the support base 11 will rotate together with the rotating part of the electric rotary table. The support base 11 and the rotating part of the electric rotary table can be fixed by bolt connection to ensure a strong connection and coaxiality. Alternatively, a tapered fit or key connection can be used to achieve quick assembly / disassembly and precise positioning of the support base 11 and the rotating part while ensuring coaxiality.

[0051] The two-dimensional reflector system of this application constructs a stable and precisely controllable azimuth rotation mechanism by defining the azimuth drive mechanism 2 as an electric rotary table and connecting the support base 11 to the rotating part of the electric rotary table. The electric rotary table utilizes its internal motor, reduction mechanism, and position feedback system to precisely drive its rotating part to rotate 360 ​​degrees. Since the support base 11 is directly fixedly connected to the rotating part of the electric rotary table, when the rotating part of the electric rotary table rotates, the support base 11, along with the reflector assembly 12, transmission link 13, and transmission ring 14 mounted on it, will synchronously rotate precisely around the Y-axis as a whole. This configuration ensures high-precision positioning and motion control of the entire reflector system in the azimuth dimension, thus providing a stable rotating base for the reflector assembly 12, enabling it to accurately receive and reflect light, and working in conjunction with the linear drive mechanism 3 to achieve the oscillation of the reflector assembly 12 on the X-axis, ultimately achieving the purpose of two-dimensional precise pointing control of light.

[0052] In a preferred embodiment, the two opposite sides of the reflector assembly 12 are respectively hinged to the support base 11 via rotation axes, and the two rotation axes are coaxially arranged, with their axes forming the X-axis.

[0053] In this embodiment, the two opposite sides of the reflector assembly 12 are hinged to the support base 11 via rotating shafts. This means that the reflector assembly 12 and the support base 11 are connected through two independent but mutually cooperating rotating connection points. This two-point hinge method can provide more stable support for the reflector assembly 12, effectively distribute the load acting on the hinge point, and significantly reduce the shaking or stress concentration that may be caused by a single-point hinge. The method of achieving this hinge can include, but is not limited to: providing protruding pins on both sides of the reflector assembly 12, these pins being precisely inserted into pre-set shaft holes on the support base 11 to form a rotating pair; or, providing protruding pins on the support base 11, with cooperating shaft holes on both sides of the reflector assembly 12, the pins passing through the shaft holes to complete the hinge. The two rotating shafts are coaxial, meaning that the geometric axes of the two rotating shafts precisely coincide in space. This coaxiality is crucial for ensuring that the mirror assembly 12 rotates purely around a single, defined, and stable X-axis, effectively avoiding deviations in the swing trajectory, mechanical interference, or unnecessary stress caused by non-parallel or non-collinear axes. Achieving coaxiality can be accomplished by ensuring geometric accuracy through high-precision machining of the shaft holes or pin mounting positions on the support 11, or by using specialized calibration tools or fixtures for precise alignment during assembly. By defining the axes of these two coaxial rotation axes as the X-axis, the swing of the mirror assembly 12 is ensured to occur around a preset, fixed axis that is strictly perpendicular to the Y-axis of the support 11, providing a solid foundation for precise control of the mirror assembly 12's attitude.

[0054] By setting coaxial rotation axes on opposite sides of the reflector assembly 12, and making the axes of these rotation axes together form the X-axis, a stable and precise rotational swing center is provided for the reflector assembly 12. When the transmission link 13 acts on the reflector assembly 12, the torque it applies can be efficiently and accurately converted into rotational motion of the reflector assembly 12 around the X-axis. This double-sided coaxial hinge structure design greatly enhances the mechanical stability of the reflector assembly 12 during swinging, effectively suppressing swaying and deviation that may be caused by single-point support or axis deviation. Therefore, the swinging motion of the reflector assembly 12 can be smoother and more precise, ensuring the stability and pointing accuracy of the optical path, thus providing a reliable attitude control basis for the entire two-dimensional reflector system.

[0055] In a preferred embodiment, the reflector assembly 12 includes a frame for mounting a reflector lens. The frame has two oppositely arranged sides. The support base 11 is provided with upwardly extending hinge lugs 110 at positions corresponding to the two sides. The hinge lugs 110 are provided with shaft holes, and the sides are provided with mating hinge holes. The rotating shaft passes through the shaft hole and the hinge hole.

[0056] In this embodiment, a reflective lens is mounted in the frame, with the center of the reflective lens coinciding with the X-axis of the four-bar linkage, enabling the reflective lens to swing synchronously with the frame. The reflective mirror assembly 12 is oscillatingly mounted on the support base 11 by precisely inserting the rotation axis through the shaft hole of the hinge lug 110 and the hinge hole on the side of the frame. This design ensures that the reflective mirror assembly 12 can precisely rotate and oscillate around the X-axis with the rotation axis as the center, under the stable support of the hinge lug 110. The frame, as the carrier of the reflector, forms a reliable hinge joint with the hinge lug 110 of the support base 11 via the rotation axis, effectively limiting the radial and axial movement of the reflective mirror assembly 12 during oscillation, thereby avoiding problems such as unstable oscillation or decreased accuracy caused by loose connections or unreasonable structures. When the azimuth drive mechanism 2 drives the support base 11 to rotate as a whole, and the linear drive mechanism 3 drives the transmission ring 14 to move in the vertical direction, the transmission link 13 converts the linear motion into the rotational swing of the reflector assembly 12. The aforementioned hinge structure ensures the smoothness and high precision of this swing process, enabling the two-dimensional reflector system to accurately perform the reflection of the incident beam and the guidance of the outgoing beam.

[0057] In summary, the two-dimensional reflector system of the present invention has the following beneficial effects:

[0058] (1) Lightweight and High-Speed ​​Response: Through a four-bar linkage mechanism, combined with an electric rotary table and a miniature electric push rod, only the reflector assembly 12, transmission link 13, and transmission ring 14 are driven. Compared to the overall driving method of traditional gimbal cameras, according to the moment of inertia formula: J=mr², the moment of inertia of this invention under the same torque conditions is about 10% of that of the gimbal camera mode. According to the rotational law M=Jβ, M is the net external torque, and β is the angular acceleration. When the net external torque M is constant, the moment of inertia J is inversely proportional to the angular acceleration β. In summary, the angular acceleration of this invention is about 100 times that of the traditional gimbal mode, which can meet the requirements of high-speed tracking.

[0059] (2) Compact structure: The four-bar linkage integrates vertical and horizontal rotation functions, eliminating the need for two separate mechanical shaft systems, reducing the overall volume by 70%-90%, making it suitable for scenarios with limited installation space.

[0060] (3) Precise and stable: By precisely controlling the linear reciprocating motion of the transmission ring 14 and the rotation angle of the support seat 11, the vibration amplitude of the reflector assembly 12 when it deflects at high speed along the Y-axis and X-axis can be controlled within ±0.01°, and the imaging stability is significantly improved.

[0061] (4) Easy maintenance: The mechanism has fewer parts and simpler connection methods, reducing assembly and maintenance costs by more than 30%.

[0062] refer to Figure 4 The present invention also provides an optical imaging system, including the above-described two-dimensional mirror system, and further including an imaging device 6. The imaging device 6 is disposed below the two-dimensional mirror system. The support base 11 has a light transmission channel 111 for light to pass through. The reflective surface of the mirror assembly 12 is located above the light transmission channel 111. The reflective surface of the mirror assembly 12 is configured to receive the incident light beam and reflect it into an outgoing light beam in the same direction as the Y-axis. The outgoing light beam passes through the light transmission channel 111 of the support base 11 and is received by the imaging device 6.

[0063] In this embodiment, based on the aforementioned two-dimensional reflector system, the imaging device 6 is positioned below the two-dimensional reflector system, and a light transmission channel 111 is cleverly provided on the support base 11. The reflective surface of the reflector assembly 12 is located above its internal light transmission channel 111 and is configured to receive the incident light beam and reflect it into an outgoing light beam in the same direction as the Y-axis. These outgoing light beams then pass through the light transmission channel 111 of the support base 11 and are finally received by the imaging device 6 located below. This integrated design enables the two-dimensional reflector system to not only achieve precise two-dimensional control of the direction of the reflected light beam, but also to efficiently guide external horizontal light to the internal imaging device 6 for acquisition, forming a compact and fully functional optical imaging system. This system can achieve high-definition and 360° full-field scanning, enabling the simultaneous operation of several or even dozens of gimbal cameras.

[0064] It should be noted that the imaging device 6 is a device used to capture optical information and convert it into electrical signals or digital data. Specifically, the imaging device 6 can be a digital camera, such as an SLR camera, mirrorless camera, or industrial camera, used to capture still images or videos; or it can be a photodetector array, such as a CMOS sensor or CCD sensor, used for high-sensitivity or specific wavelength light signal acquisition; or it can be a spectrometer used to analyze the spectral information of incident light. The imaging device 6 is positioned below the two-dimensional reflector system to determine its relative position to the two-dimensional reflector system, ensuring that the light beam reflected by the reflector assembly 12 can be received by the imaging device 6. The imaging device 6 can be fixed to the base below the two-dimensional reflector system via a bracket or base, ensuring that its optical axis is aligned with the light transmission channel 111 of the support 11; or, the imaging device 6 can be directly integrated into the base structure of the two-dimensional reflector system, forming a compact whole.

[0065] As a preferred embodiment, the light transmission channel 111 is arranged along the Y-axis direction of the support base 11.

[0066] In this embodiment, by setting the light transmission channel 111 along the Y-axis of the support base 11, it is ensured that light can be stably and efficiently transmitted from the reflector assembly 12 to the imaging device 6. Specifically, when the reflector assembly 12 reflects the horizontal incident light into downward emitted light, the emitted light passes directly through the light transmission channel 111 set along its Y-axis inside the support base 11 and is transmitted to the imaging device 6. Since the Y-axis of the support base 11 is the central axis for the azimuth rotation of the entire two-dimensional reflector system, setting the light transmission channel 111 along this axis ensures that the propagation path of the emitted light beam is aligned with the rotation central axis of the system. Thus, regardless of how the azimuth drive mechanism 2 drives the support base 11 and the reflector assembly 12, transmission link 13, and transmission ring 14 mounted on it to rotate 360 ​​degrees around the Y-axis, the final emission position of the emitted light beam has the smallest lateral offset relative to the imaging device 6, which can even be ignored. By optimizing the optical path layout, the potential problems of optical path obstruction and spatial interference encountered when integrating the imaging device 6 below the two-dimensional mirror system are effectively solved, ensuring the effective transmission and reception of optical signals. Furthermore, this alignment with the Y-axis greatly simplifies the optical coupling between the imaging device 6 and the two-dimensional mirror system, ensuring that the imaging device 6 can continuously and stably receive the reflected beam during azimuth scanning, thereby enabling continuous observation or imaging of the target area.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the invention without departing from the principles and spirit of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A two-dimensional mirror system, characterized in that, include: The four-bar linkage includes a support base (11), a reflector assembly (12), a transmission link (13), and a transmission ring (14); the support base (11) has a Y-axis extending in the vertical direction, the reflector assembly (12) is oscillatingly mounted on the support base (11), and the reflector assembly (12) is constrained to rotate about an X-axis perpendicular to the Y-axis; the first end of the transmission link (13) is hinged to the reflector assembly (12) at a position offset from the X-axis; the inner wall of the transmission ring (14) cooperates with the outer wall of the support base (11) and is hinged to the second end of the transmission link (13); Orientation drive mechanism (2), the output end of which is connected to support base (11); A linear drive mechanism (3) has its output end connected to a transmission ring (14); The control module is communicatively connected to the azimuth drive mechanism (2) and the linear drive mechanism (3) and is used to receive instructions and coordinate the actions of the two. The azimuth drive mechanism (2) is used to drive the support base (11) and the reflector assembly (12), transmission link (13) and transmission ring (14) mounted thereon to rotate 360 ​​degrees around the Y-axis. The linear drive mechanism (3) is used to drive the transmission ring (14) to reciprocate linearly along a direction parallel to the Y-axis, thereby driving the reflector assembly (12) to rotate and swing around the X-axis. It also includes a bearing (4) and a movable seat (5), the inner ring of the bearing (4) is fixedly fitted with the outer wall of the transmission ring (14), the outer ring of the bearing (4) is fixedly fitted with the movable seat (5), and the movable seat (5) is connected to the output end of the linear drive mechanism (3); The inner ring of the bearing (4) is interference-fitted with the outer wall of the transmission ring (14); The movable seat (5) has an annular through hole and two oppositely arranged connecting parts (51). The outer ring of the bearing (4) is fixedly fitted with the inner wall of the annular through hole. The two connecting parts (51) are respectively connected to a linear drive mechanism (3).

2. The two-dimensional mirror system according to claim 1, characterized in that, The linear drive mechanism (3) is a miniature electric push rod.

3. The two-dimensional mirror system according to claim 1, characterized in that, The orientation drive mechanism (2) is an electric rotary table, and the support base (11) is connected to the rotating part of the electric rotary table.

4. The two-dimensional mirror system according to claim 1, characterized in that, The two sides of the reflector assembly (12) are respectively hinged to the support base (11) through rotating shafts. The two rotating shafts are coaxially arranged, and their axes together form the X-axis.

5. The two-dimensional mirror system according to claim 4, characterized in that, The mirror assembly (12) includes a frame for mounting mirror lenses. The frame has two opposite sides. The support base (11) is provided with upwardly extending hinge lugs (110) corresponding to the two sides. The hinge lugs (110) are provided with shaft holes. The sides are provided with mating hinge holes. The rotating shaft passes through the shaft hole and the hinge hole.

6. An optical imaging system, characterized in that, The two-dimensional reflector system according to any one of claims 1 to 5 further includes an imaging device (6), which is disposed below the two-dimensional reflector system. The support base (11) has a light transmission channel (111) for light to pass through. The reflective surface of the reflector assembly (12) is located above the light transmission channel (111). The reflective surface of the reflector assembly (12) is configured to receive an incident light beam and reflect it into an outgoing light beam in the same direction as the Y-axis. The outgoing light beam passes through the light transmission channel (111) of the support base (11) and is received by the imaging device (6).

7. The optical imaging system according to claim 6, characterized in that, The light transmission channel (111) is arranged along the Y-axis of the support base (11).

Images