Micro super wide-angle fast reflecting mirror based on light sensing and electromagnetic driving

Abstract

The application discloses a micro super-large-angle fast reflector based on light sensing and electromagnetic driving, which comprises a main base, a working mirror body, an electromagnetic driving assembly and a point light source sensor, the working mirror body is fixedly installed in the interior of a permanent magnet mirror seat, a two-dimensional rotary assembly comprises an inner ring seat, an outer ring seat and needle hinges, the inner ring seat is rotatably installed with the permanent magnet mirror seat through the needle hinges installed in the Y-axis direction, the outer ring seat is rotatably installed with the inner ring seat through the needle hinges installed along the X-axis direction, the electromagnetic driving assembly comprises the permanent magnet mirror seat and a motor coil, the motor coil is a cross-over winding coil, the inner side of the permanent magnet mirror seat close to the interior of the base is provided with a protruding reflecting surface, and the point light source sensor comprises a photosensitive element and an LED emitting light source which are fixedly installed on a sensor circuit board; in the application, the miniaturization design of the fast reflector is realized, the fast and accurate driving of the working mirror body of the fast reflector is realized, and the super-large-angle function of the working mirror body of the fast reflector can be realized.

Description

Technical Field

[0001] This invention relates to the field of rapid control mirror technology, and in particular to a miniature ultra-large angle rapid reflector based on light sensing and electromagnetic drive. Background Technology

[0002] A fast-control mirror is an important component that works between a light source or receiver and a target to adjust and stabilize the line of sight or beam pointing of an optical system. It has the advantages of small size, compact structure, high precision, and high bandwidth, and has been widely used in important fields such as space laser communication, astronomical telescopes, optical stabilization, line-of-sight stabilization, precision acquisition, aiming and tracking, deep space exploration, high-precision laser processing equipment, and carrier laser systems.

[0003] Due to the high frequency response requirements of fast reflector systems and their use in optical paths, which imposes stringent size constraints, existing angle sensors have low space utilization, and traditional actuators in confined spaces have limited output capacity, failing to meet higher bandwidth requirements. In the field of optoelectronic system stabilization, the demands for lightweight, high-power, and high-frequency response are steadily increasing, necessitating improvements in fast reflector response frequency, control precision, and system size reduction. Simultaneously, with the widespread application of fast reflectors, the requirements for their rotation angle range are becoming increasingly stringent, evolving from 0.5° and 1° to 3° and 5°. Furthermore, in environments where primary image stabilization systems are not used, there is a growing demand for ultra-large angle fast reflector systems.

[0004] In summary, realizing a fast reflector system that is small in size, has high bandwidth, and has an extremely large angular travel range has become a necessary research direction. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing angle sensors have low space utilization and the traditional actuators in small spaces have low output limits, making it impossible to achieve higher bandwidth requirements and the rotation angle stroke of the fast reflector is small. The present invention provides a miniature ultra-large angle fast reflector based on light sensing and electromagnetic drive, including a main base, a two-dimensional rotation assembly, a working mirror body, an electromagnetic drive assembly, and a point light source sensor. The working mirror body is fixedly installed inside the permanent magnet mirror base. The two-dimensional rotation assembly includes an inner ring seat, an outer ring seat, and a pin-type hinge. The inner ring seat is rotatably installed with the permanent magnet mirror base through the pin-type hinge installed in the Y-axis direction, and the outer ring seat is rotatably installed with the inner ring seat through the pin-type hinge installed in the X-axis direction. The outer ring seat is fixed on the main base. The electromagnetic drive assembly includes a permanent magnet mirror base and a motor coil. The motor coil is a coil wound in a cross-shaped winding manner. The permanent magnet mirror base has a protruding reflective surface on the inner side near the base. The point light source sensor includes a photosensitive element and an LED emitting light source fixedly installed on the sensor circuit board. The photosensitive element is located on the outer periphery of the point light source.

[0006] Optionally, the permanent magnet mirror mount is located at one end of the main base, and an end cap is fixedly installed at the other end of the main base. The sensor circuit board and motor coil are located inside the base.

[0007] Optionally, the photosensitive element and LED emission light source are located on one side close to the working mirror body, the sensor circuit board is located between the permanent magnet mirror base and the motor coil, and the drive circuit board connected to the motor coil is fixedly mounted on the rear cover.

[0008] Optionally, the inner ring seat is located inside the outer ring seat and is coaxially arranged, and four pin-type hinges are arranged symmetrically in pairs along the vertical X-axis and Y-axis directions respectively.

[0009] Optionally, the pin hinge includes a stator and a rotor.

[0010] Optionally, the stator of the pin hinge has a matching thread on its outer periphery.

[0011] Optionally, a baffle is provided at the stator end of the pin hinge.

[0012] Through the above design scheme, the present invention can bring the following beneficial effects:

[0013] 1. The needle-type hinge used in this invention forms a two-dimensional rotational axis system with the inner and outer ring seats. The needle-type hinge provides good support in both the radial and axial directions. The smooth treatment of the rotor end face of the needle-type hinge can significantly reduce the frictional rotational torque, facilitating an increase in the overall bandwidth.

[0014] 2. This invention uses an integrated electromagnetic drive component, which can provide high output efficiency within a very small space, enabling rapid and precise driving of the working mirror body. This achieves miniaturization of the fast-reflecting mirror design while significantly improving the product's design bandwidth.

[0015] 3. Through the rational layout of the point light source sensor components, this invention can achieve information feedback function at an ultra-large angle. The rotation angle range of the working mirror can reach more than 20°, realizing the possibility of designing an ultra-large angle fast reflector. This ensures that the point light source sensor can sense the position information of the actual working mirror, avoids excessive errors, and ensures the control accuracy of the entire system.

[0016] 4. This invention achieves ultra-large rotation angle of the working mirror body of the fast reflector with a relatively low precision sacrifice, which can be adapted to various types of optical path stabilization effects, providing more possibilities in optical path design and saving space in large optical system design. Attached Figure Description

[0017] Figure 1 This is a two-dimensional cross-sectional schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a three-dimensional schematic diagram of the structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the principle of a point light source sensor;

[0020] Figure 4 This is a schematic diagram of the layout of a point light source sensor;

[0021] Figure 5 This is a schematic diagram of the electromagnetic drive component.

[0022] Figure 6 This is a schematic diagram of a needle-type hinge structure.

[0023] In the attached diagram, 1.1 main base, 1.2 outer ring seat, 1.3 pin hinge, 1.4 inner ring seat, 1.5 working mirror body, 1.6 permanent magnet mirror seat, 1.7 photosensitive element, 1.8 LED emitting light source, 1.9 motor coil, 1.10 drive circuit board, 1.11 back cover, 1.12 sensor circuit board, 1.31 stator, 1.32 rotor, 1.33 adapter thread, and 1.34 baffle. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] like Figures 1-2 As shown, in this invention, the permanent magnet mirror mount 1.6 is used to fix the working mirror body 1.5. The permanent magnet mirror mount 1.6 and the working mirror body 1.5 are mounted on the main base 1.1 via a two-dimensional rotary assembly. The two-dimensional rotary assembly includes an inner ring seat 1.4, an outer ring seat 1.2, and a pin-type hinge 1.3, as shown. Figure 2 As shown, the inner ring seat 1.4 is located inside the outer ring seat 1.2 and is coaxially arranged. Four pin-type hinges 1.3 are symmetrically arranged in pairs along the vertical X-axis and Y-axis directions. The inner ring seat 1.4 is rotatably mounted to the permanent magnet mirror seat 1.6 via the pin-type hinges 1.3 mounted along the Y-axis. The outer ring seat 1.2 is rotatably mounted to the inner ring seat 1.4 via the pin-type hinges 1.3 mounted along the X-axis. The four pin-type hinges 1.3 are distributed around the working mirror body 1.5. The working mirror body 1.5 can rotate around the pin-type hinges 1.3 in two directions: azimuth rotation around the X-axis and pitch rotation around the Y-axis. Specifically, as shown... Figure 6As shown, the pin hinge 1.3 includes a stator 1.31 and a rotor 1.32. The inner ring seat 1.4 is fixedly installed with the stator 1.31 of the pin hinge 1.3 in the Y direction via an adapter thread 1.33. The rotor 1.32 of the pin hinge 1.3 in the Y direction is inserted into the mounting hole of the permanent magnet mirror seat 1.6, allowing the permanent magnet mirror seat 1.6 to rotate around the pin hinge 1.3 in the Y direction. The outer ring seat 1.2 is fixedly installed with the stator 1.31 of the pin hinge 1.3 in the X direction via an adapter thread 1.33. The rotor 1.32 of the pin-type hinge 1.3 in the X direction is inserted into the mounting hole of the inner ring seat 1.4, so that the inner ring seat 1.4 and the permanent magnet mirror seat 1.6 can rotate together around the pin-type hinge 1.3 in the X direction. The end face of the rotor 1.32 of the pin-type hinge 1.3 is smoothed to reduce the frictional rotation torque and facilitate the improvement of the overall bandwidth. A baffle 1.34 is provided at the end of the stator 1.31 of the pin-type hinge 1.3 to limit the installation position of the pin-type hinge 1.3.

[0026] like Figure 1 As shown, the drive circuit board 1.10 is fastened to the rear cover 1.11 with screws, and the rear cover 1.11 is fastened to the main base 1.1 with screws. The drive circuit board 1.10 is connected to the motor cable of the motor coil 1.9, and the motor coil 1.9 is fastened to the main base 1.1 with screws. The motor coil 1.9 and the permanent magnet mirror mount 1.6 form an electromagnetic drive assembly, as shown. Figure 5 As shown, the motor coil 1.9 is a coil wound in a cross-shaped winding pattern, and the permanent magnet mirror base 1.6 is made of permanent magnet steel. The motor coil 1.9 generates a magnetic field effect through the energization of its two windings, producing X and Y magnetic fields when the motor coil 1.9 is energized. Figure 5 As shown, the X and Y magnetic fields act on the permanent magnet mirror base 1.6. The pin-shaped hinges 1.3 set along the X-axis and Y-axis are perpendicular to the magnetic poles of the X and Y magnetic fields and parallel to the magnetic field lines on the side closest to the permanent magnet mirror base 1.6. The X and Y magnetic fields drive the permanent magnet mirror base 1.6 to deflect around the X and Y axes, thereby realizing the driving function of the electromagnetic drive component for the working mirror body 1.5. The electromagnetic drive component makes the present invention compact, achieving a large output effect with a very small volume, enabling the permanent magnet mirror base 1.6 and the working mirror surface to rotate quickly and accurately. The motor coil 1.9 can realize the forward and reverse deflection control of the working mirror body 1.5 through forward and reverse current control. Then, through the algorithm closed-loop control circuit, the effective driving of the fast reflector is finally realized.

[0027] A point light source sensor is mounted on the sensor circuit board 1.12. The point light source sensor transmits light from an LED emitting light source 1.8 to the reflective surface of the permanent magnet mirror mount 1.6. The reflected light then enters the photosensitive element 1.7 surrounding the LED emitting light source 1.8. The angle of rotation of the working mirror body 1.5 is determined by the change in the light spot distribution. Since the permanent magnet mirror mount 1.6 is directly fixed to the working mirror body 1.5, the rotation angle of the working mirror body 1.5 can be measured by measuring the rotation angle of the permanent magnet mirror mount 1.6. Therefore, the reflective surface of the permanent magnet mirror mount 1.6 can be used as the measuring surface of the point light source sensor. Specifically, the point light source sensor... Figure 4 As shown, the central element is an LED light source 1.8, surrounded by four photosensitive elements 1.7. The light beam emitted from the LED light source 1.8 illuminates the convex reflective surface on the back of the permanent magnet mirror mount 1.6. After reflection, the beam illuminates the photosensitive elements 1.7 around the point light source assembly, forming a light spot acquisition model. When the permanent magnet mirror mount 1.6 and the working mirror body 1.5 rotate as a unit, the light spot model acquired by the four photosensitive elements 1.7 changes, thus acquiring the deflection angle information. By rationally setting and arranging the point light source sensors, an ultra-large angle information feedback function can be achieved. The rotation angle range of the working mirror body 1.5 can reach more than 20°, realizing the possibility of designing an ultra-large angle fast reflector. This ensures that the point light source sensors can sense the actual position information of the working mirror body 1.5, avoiding excessive errors and ensuring the control accuracy of the entire system. The specific calculation principle is as follows... Figure 3 As shown, the LED emitting light source 1.8 emits a beam with a fixed emission angle. The beam is incident along the emission angle β in the solid line direction shown in the figure. After reflection along the solid line, it illuminates the inner edge of the photosensitive element 1.7. This is the closest distance position between the designed reflective surface and the point light source assembly. When the permanent magnet mirror base 1.6 and the working mirror body 1.5 are deflected as a unit, the beam is incident along the emission angle β in the solid line direction shown in the figure. After reflection along the dashed line direction, it illuminates the outer edge of the photosensitive element 1.7. This is the position where the fast reflector can rotate to its maximum angle. The rotation angle of the permanent magnet mirror base 1.6 and the working mirror body 1.5 is measured by the angle γ. Through reasonable design and reasonable selection of the point light source assembly, the rotation angle stroke of the fast reflector designed in this scheme can reach more than 25°.

[0028] When installing the permanent magnet mirror mount 1.6, insert the pin hinge 1.3 into the inner ring seat 1.4 and the permanent magnet mirror mount 1.6 respectively. Tighten the stator 1.31 of the pin hinge 1.3 so that the inner side of the outer ring seat 1.2 or the inner ring seat 1.4 is against the end face of the limiting baffle 1.34. Use a flange and fastening screws to fix the outer ring seat 1.2 onto the main base 1.1, and use epoxy adhesive to bond the working mirror body 1.5 to the inside of the permanent magnet mirror mount 1.6, thus completing the permanent magnet mirror mount 1.6 and the working mirror body 1. Assembly work .5: Secure the sensor circuit board 1.12, which contains the point light source sensor, to the main base 1.1 with screws. Fix the motor coil 1.9 between the sensor circuit board 1.12 and the drive circuit board 1.10 using a flange and fastening screws. Fix the end cap to the end of the main base 1.1. The permanent magnet mirror mount 1.6 and the working mirror body 1.5 are driven by the electromagnetic drive assembly formed by the motor coil 1.9 and the permanent magnet mirror mount 1.6. This is achieved through external rapid... The reflector controller enables communication and power supply functions, thereby completing the closed-loop control of the entire fast reflector system. The motor coil 1.9 is energized via the drive circuit board 1.10, generating X and Y magnetic fields through the two windings. These magnetic fields act on the permanent magnet mount 1.6, and the forward and reverse currents control the deflection of the permanent magnet mount 1.6 around the X and Y axes, thus enabling the electromagnetic drive assembly to drive the working mirror body 1.5. A beam of light emitted from the LED light source 1.8 illuminates the convex reflective surface on the back of the permanent magnet mount 1.6. After reflection, the beam illuminates the photosensitive elements 1.7 around the point light source assembly, forming a light spot acquisition model. When the permanent magnet mount 1.6 and the working mirror body 1.5 deflect together, the light spot model acquired by the four photosensitive elements 1.7 changes, thus acquiring deflection angle information. This allows for ultra-large angle information feedback, with the working mirror body 1.5's rotation angle range reaching over 20°.

Claims

1. A micro electro-magnetic driven ultra-wide angle fast steering mirror based on optical sensing, characterized in that, The application relates to a two-dimensional rotary sensor, which comprises a main base, a two-dimensional rotary assembly, a working mirror body, an electromagnetic driving assembly and a point light source sensor. The working mirror body is fixedly installed in the interior of the permanent magnetic mirror base; the two-dimensional rotary assembly comprises an inner ring base, an outer ring base and needle hinges; the inner ring base is rotatably installed with the permanent magnetic mirror base through the needle hinges installed in the Y-axis direction; the outer ring base is rotatably installed with the inner ring base through the needle hinges installed in the X-axis direction; the needle hinges comprise stators and rotors; the inner ring base is fixedly installed with the stators of the needle hinges in the Y-axis direction through adaptive threads; the rotor of the needle hinge in the Y-axis direction is inserted into the installation hole of the permanent magnetic mirror base, so that the permanent magnetic mirror base can rotate around the needle hinge in the Y-axis direction; the outer ring base is fixedly installed with the stators of the needle hinges in the X-axis direction through adaptive threads; the rotor of the needle hinge in the X-axis direction is inserted into the installation hole of the inner ring base, so that the inner ring base and the permanent magnetic mirror base can rotate together around the needle hinge in the X-axis direction; the end surface of the rotor of the needle hinge is finely processed; The outer ring base is fixed on the main base; the electromagnetic driving assembly comprises the permanent magnetic mirror base and motor coils; the motor coils are cross-wound coils; the motor coils generate magnetic field effects through two winding power supply paths; X and Y magnetic fields are generated under the condition that the motor coils are powered; the needle hinges arranged in the X-axis direction and the needle hinges arranged in the Y-axis direction are perpendicular to the magnetic pole directions of the X and Y magnetic fields and parallel to the magnetic induction directions close to the permanent magnetic mirror base; the X and Y magnetic fields drive the permanent magnetic mirror base to deflect around the X and Y axes; 2. A micro super-large-angle fast steering mirror based on light sensing and electromagnetic driving according to claim 1, characterized in that, The permanent magnetic mirror base is provided with a convex reflecting surface close to the inner side of the base interior; the point light source sensor comprises a light sensing element and an LED light emitting source fixedly installed on a sensor circuit board; the light sensing element is arranged at the outer periphery of the point light source.

3. The micro super-large-angle fast steering mirror based on photo-sensing and electromagnetic driving according to claim 2, characterized in that, The permanent magnetic mirror base is arranged at one end of the main base; an end cover is fixedly arranged at the other end of the main base; the sensor circuit board and the motor coils are arranged in the base.

4. The micro electro-magnetic driven fast steering mirror with ultra wide angle based on optical sensing according to claim 1, wherein, The light sensing element and the LED light emitting source are arranged on the side close to the working mirror body; the sensor circuit board is arranged between the permanent magnetic mirror base and the motor coils; a driving circuit board connected with the motor coils is fixedly installed on the rear cover.

5. The micro electro-magnetic driven ultra-wide angle fast steering mirror based on photo-sensing according to claim 4, wherein, The inner ring base is coaxially arranged in the inner side of the outer ring base; the needle hinges are arranged in four and symmetrically arranged in pairs along the perpendicular X and Y axes. The end portion of the stator of the needle hinge is provided with a baffle.

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