Double-shaft fast reflecting mirror

Abstract

The utility model discloses a double-shaft fast reflecting mirror, which comprises a base, a flexible hinge, a mirror bracket, a reflecting lens, four driving assemblies and two groups of sensors, the driving assembly is a voice coil motor comprising motor stators and motor rotors, the four motor stators are symmetrically fixed on the base in a cross shape, and the four motor rotors are symmetrically fixed on the lower surfaces of four support lugs of the mirror frame in a cross shape; each sensor is a photoelectric displacement sensor comprising an anti-radiation sensing module and a shading plate, the anti-radiation sensing modules of the two groups of sensors are vertically fixed on the base, and an included angle of 45 degrees is formed between the anti-radiation sensing modules of the two groups of sensors and an adjacent motor stator; the shading plates of the two groups of sensors are fixed on the mirror bracket in a mutually perpendicular manner, and form an included angle of 45 degrees with the adjacent motor rotors; when the shading plate is inserted into the anti-radiation sensing module to move, the light sensing area can be changed, so that the deflection angle can be measured. According to the utility model, the cost is reduced, excellent radiation resistance is obtained, and the use requirement of a space radiation environment can be met.

Description

Technical Field

[0001] This utility model belongs to the field of fast-control mirrors, specifically relating to a dual-axis fast-reflection mirror. Background Technology

[0002] A fast-reflecting mirror (FRMirror) is a device used to adjust the beam between the beam transmitter and receiver. It is a key component for adjusting and stabilizing the beam direction in a communication link and has broad application prospects in the field of laser communication. It can also be used in inter-satellite, satellite-to-ground, and ground-to-ground applications. In the field of laser communication, especially for onboard payloads, products are required to be small in size, lightweight, and radiation resistant.

[0003] CN108873320A discloses a two-dimensional fast-control mirror, which uses a specially structured voice coil actuator as the driving component and a capacitive displacement sensor as the feedback component to measure the deflection angle of the reflector. However, it is not suitable for the orbital space environment for the following reasons: (1) the capacitive displacement sensor has a slow response speed and a complex back-end circuit, and the voice coil actuator has a complex structure, resulting in a large volume and weight of the entire fast-control mirror; (2) the back-end circuit of the capacitive displacement sensor cannot achieve radiation protection measures under the conditions of low cost and small volume; therefore, this two-dimensional fast-control mirror does not meet the conditions for orbital application. In addition, since a large number of fast-control mirrors are needed for inter-satellite networking, price is also an important consideration. Utility Model Content

[0004] The purpose of this invention is to provide a biaxial fast-reflecting mirror that achieves excellent radiation resistance while reducing costs, thus meeting the requirements for use in space radiation environments.

[0005] The dual-axis fast-reflecting mirror of this invention includes a base, a flexible hinge, a mirror frame, a reflective lens, four identical drive components, and two identical sets of sensors. The lower end of the flexible hinge is fixed to the center of the base, and the upper end of the flexible hinge is fixedly connected to the mirror frame. The reflective lens is fixedly mounted on the mirror frame.

[0006] The driving component is a voice coil motor, which includes a stator and a mover. Four stators are symmetrically fixed to the base in a cross shape, and four movers are symmetrically fixed to the lower surface of the four lugs of the frame in a cross shape, each corresponding to one of the four stators. When the voice coil motor is energized, the movers drive the frame to deflect.

[0007] The sensor is a photoelectric displacement sensor, which includes a radiation-resistant sensing module and a light-shielding plate. The radiation-resistant sensing modules of the two sets of sensors are fixed perpendicularly to each other on the base, and at a 45° angle to the adjacent motor stator. The light-shielding plates of the two sets of sensors are fixed perpendicularly to each other on the frame, and at a 45° angle to the adjacent motor mover. The light-shielding plate is inserted into the radiation-resistant sensing module. When the frame deflects, causing the light-shielding plate to deflect (i.e., when the light-shielding plate moves relative to the radiation-resistant sensing module), it changes the photosensitive area of ​​the radiation-resistant sensing module, thereby achieving the measurement of the deflection angle (i.e., deflection angular displacement).

[0008] Preferably, the dual-axis fast-reflecting mirror further includes a protective cover and a bottom cover. The protective cover has a light-transmitting hole at its center corresponding to the reflecting mirror. The protective cover is fixedly connected to the base, covering the flexible hinge, mirror frame, reflecting mirror, four identical drive components, and two identical sets of displacement sensors for their protection. The bottom cover is fixedly connected to the bottom surface of the base.

[0009] Preferably, each sensor group consists of a photoelectric displacement sensor. Two radiation-resistant sensing modules of the two sensor groups are fixed to the base at a 90° interval and at a 45° angle to the adjacent motor stator. Two light-shielding plates of the two sensor groups are fixed to the mirror frame at a 90° interval and at a 45° angle to the adjacent motor mover. This dual-axis fast-reflecting mirror with two photoelectric displacement sensors is designed for applications with lower accuracy requirements and narrower temperature variation ranges.

[0010] Preferably, one sensor set consists of two photoelectric displacement sensors. The four radiation-resistant sensing modules of the two sensor sets are symmetrically fixed to the base in a cross shape, and are spaced at a 45° angle from the adjacent motor stator. The four light-shielding plates of the two sensor sets are symmetrically fixed to the mirror frame in a cross shape, and are spaced at a 45° angle from the adjacent motor mover. The dual-axis fast-reflecting mirror with four photoelectric displacement sensors is designed for applications requiring high precision and with a wide temperature range.

[0011] Preferably, the radiation-resistant sensing module includes a shielding plate, a receiver, a transmitter, a shaping cover, a reflector, and a PCB substrate. The receiver and transmitter are soldered onto the PCB substrate. The shielding plate and the shaping cover are both made of metal. The shielding plate and the shaping cover are fixedly connected to form a radiation-resistant shielding cavity, and the shaping cover and the reflector are fixedly connected to form a reflective cavity. The shaping cover has a limiting hole and a shaping hole. The PCB substrate is fixedly connected inside the radiation-resistant shielding cavity. The transmitter passes through the limiting hole, and its light-emitting surface extends into the reflective cavity. The receiver is directly opposite the shaping hole. The shielding plate has a light-transmitting hole. The shielding plate is inserted into the reflective cavity and can move relative to the reflective cavity. The reflected light can pass through the shaping hole and reach part of the photosensitive surface of the receiver through the light-transmitting hole. The radiation-resistant shielding cavity formed by the fixed connection of the shielding plate and the shaping cover can protect the transmitter and receiver from radiation, thus giving the photoelectric displacement sensor radiation resistance. It is suitable for use in dual-axis fast-reflecting mirrors in space radiation environments and can improve the reliability of the dual-axis fast-reflecting mirror. The reflective cavity formed by the fixed connection between the shaping cover and the reflector can obtain better light quality while blocking external light, thereby improving the performance of the photoelectric displacement sensor.

[0012] Preferably, the shielding plate is made of tantalum metal and the shaping cover is made of aluminum alloy, which has low cost and good radiation resistance.

[0013] Preferably, the inner surface of the reflector is a diffuse reflective surface, and the reflective cavity is a diffuse reflective cavity, so that the reflected light is soft and uniform, which can improve the sensor performance.

[0014] Preferably, there are two receivers, arranged symmetrically vertically; two transmitters, symmetrically located on the left and right sides of the receivers; two shaping holes, symmetrically arranged vertically; and two limiting holes, symmetrically located on the left and right sides of the shaping holes. This symmetrical arrangement ensures more uniform light distribution.

[0015] Preferably, the mounting hole at the upper end of the light-shielding plate for fixing the light-shielding plate to the lens frame is an elliptical hole. The mounting position of the light-shielding plate on the lens frame can be adjusted through the elliptical hole (reflecting the position and area of ​​the light-shielding plate overlapping the light-transmitting hole and the shaping hole in the reflective cavity in the initial state), thus changing the preset deflection angle of the fast-reflecting mirror.

[0016] Preferably, both the shaping aperture and the light-transmitting aperture are square, with the width of the light-transmitting aperture in the vertical direction greater than d1 and less than d2. Here, d1 represents the distance between the lower edge of the upper shaping aperture and the upper edge of the lower shaping aperture (i.e., the vertical width of the gap between the two shaping apertures), and d2 represents the distance between the upper edge of the upper shaping aperture and the lower edge of the lower shaping aperture. Since both the shaping aperture and the light-transmitting aperture are square, the lower edge of the upper shaping aperture and the upper edge of the lower shaping aperture are parallel to each other, with the zero point centered, avoiding an increase in signal nonlinearity. When the light-shielding plate moves under the drive of the frame, the area of ​​the photosensitive surface of the two receivers receiving the light signal changes, and the angle of deflection of the light-shielding plate is calculated based on this change in area.

[0017] Preferably, in the initial state (i.e., the static state), the left and right edges of the light-transmitting aperture are perpendicular to the upper and lower edges of the shaping aperture, the centerline of the light-transmitting aperture is collinear with the corresponding rotation axis of the flexible hinge, and the centerlines of the light-transmitting aperture, the upper shaping aperture, and the lower shaping aperture are parallel to each other and lie in the same plane. In the initial state, the photosensitive areas of the two receivers (i.e., the areas of the photosensitive surfaces of the receivers that can receive reflected light) are equal, thus simplifying angle calculation and achieving optimal measurement results.

[0018] This utility model has the following effects:

[0019] (1) A photoelectric displacement sensor is used as a feedback component to measure the deflection angle of the reflector. The high-speed transmission capability of light makes its response speed extremely high. After integration, the response speed and response bandwidth of the dual-axis fast reflector are greatly improved. The back-end circuit of the photoelectric displacement sensor is simple, and a voice coil motor with a motor stator and a motor mover is used as the driving component, thereby reducing the volume and weight of the dual-axis fast reflector and thus reducing the cost.

[0020] (2) The photoelectric displacement sensor includes a radiation-resistant sensing module and a light shield. The radiation-resistant shielding cavity of the radiation-resistant sensing module effectively shields the radiation from the transmitter, receiver and PCB substrate inside, thus enabling the fast reflector to obtain excellent radiation resistance and meet the requirements of the space radiation environment. Attached Figure Description

[0021] Figure 1 This is an exploded isometric view of the biaxial fast-reflection mirror in the embodiment.

[0022] Figure 2 This is a top view of the dual-axis fast-reflecting mirror in the embodiment (without a protective cover).

[0023] Figure 3 This is a cross-sectional view of the biaxial fast-reflecting mirror in the embodiment.

[0024] Figure 4 This is an exploded view of the radiation-resistant sensing module in the embodiment.

[0025] Figure 5 This is a cross-sectional view showing the correspondence between the radiation-resistant sensing module and part of the light-shielding plate in the embodiment. Detailed Implementation

[0026] To gain a more detailed understanding of the features and technical content of the embodiments of this utility model, the implementation of the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to limit the invention.

[0028] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0029] like Figures 1 to 5 As shown, the dual-axis fast-reflecting mirror in this embodiment includes a base 1, a flexible hinge 2, a mirror frame 3, a reflective lens 4, a protective cover 9, a bottom cover 10, four identical drive components (for driving the reflective lens 4 to deflect), and two identical sets of sensors. The bottom cover 10 is fixedly connected to the bottom surface of the base 1. The lower end of the flexible hinge 2 is fixedly fixed to the center of the base 1, and the upper end of the flexible hinge 2 is fixedly connected to the mirror frame 3. The reflective lens 4 is fixedly mounted on the mirror frame 3. The center of the protective cover 9 has a light-transmitting hole 91 corresponding to the reflective lens 4. The protective cover 9 is fixedly connected to the base 1, covering the flexible hinge 2, the mirror frame 3, the reflective lens 4, the four identical drive components, and the two identical sets of displacement sensors. In some embodiments, the bottom cover 10 is fixedly connected to the bottom surface of the base 1 by screws. The lower end of the flexible hinge 2 is fixedly fixed to the center of the base 1 by screws, and the upper end of the flexible hinge 2 is fixedly connected to the mirror frame 3 by screws. The reflective lens 4 is bonded and fixed inside the retainer of the mirror frame 3 with epoxy resin adhesive. The protective cover 9 is fixedly connected to the base 1 by screws.

[0030] The driving assembly is a voice coil motor, which includes a motor stator 5 and a motor mover 6. The four motor stators 5 of the four driving assemblies are symmetrically fixed to the base 1 in a cross shape, and the four motor movers 6 of the four driving assemblies are symmetrically fixed to the lower surfaces of the four lugs of the eyeglass frame 3 in a cross shape, each corresponding to one of the four motor stators 5. In some embodiments, the four motor stators 5 are symmetrically bonded to the base 1 in a cross shape, and the four motor movers 6 of the four driving assemblies are symmetrically bonded to the lower surfaces of the four lugs of the eyeglass frame 3 in a cross shape.

[0031] The sensor is a photoelectric displacement sensor, which includes a radiation-resistant sensing module 7 and a light-shielding plate 8. In some embodiments (such as scenarios with low accuracy requirements and narrow temperature variation ranges), a group of sensors consists of a single photoelectric displacement sensor (see...). Figure 1 The system consists of two radiation-resistant sensor modules 7 of two sets of sensors, fixed at a 90° interval to the base 1 and at a 45° angle to the adjacent motor stator 5. Two light-shielding plates 8 of the two sets of sensors are fixed at a 90° interval to the frame 3 and at a 45° angle to the adjacent motor mover 6. In some embodiments, the two radiation-resistant sensor modules 7 are fixed to the base 1 at a 90° interval by screws. An elliptical hole 82 is provided at the upper end of the light-shielding plate 8. A second clearance groove 763 for avoiding screw tightening operations is provided at the upper edge of the corresponding PCB substrate 76. A first clearance groove 745 for avoiding screw tightening operations is provided at the upper edge of the shaping cover 74. Metal screws pass through the elliptical hole 82 to fix the light-shielding plate 8 to the frame 3.

[0032] In some embodiments (such as scenarios requiring high accuracy and a wide temperature range), a set of sensors consists of two photoelectric displacement sensors. The four radiation-resistant sensing modules 7 of the two sets of sensors are symmetrically fixed to the base 1 in a cross shape, and are spaced at a 45° angle from the adjacent motor stator 5. The four light-shielding plates 8 of the two sets of sensors are symmetrically fixed to the lens frame 3 in a cross shape, and are spaced at a 45° angle from the adjacent motor mover 6.

[0033] In some embodiments, the radiation-resistant sensing module 7 includes a shielding plate 71, a receiver 72, a transmitter 73, a shaping cover 74, a reflector 75, and a PCB substrate 76. There are two receivers 72 and two transmitters 73, both soldered onto the PCB substrate 76. The two receivers 72 are arranged symmetrically vertically, and the two transmitters 73 are symmetrically located on the left and right sides of the receivers 72. The shielding plate 71 and the shaping cover 74 are both made of metal. The shielding plate 71 and the shaping cover 74 are fixedly connected to form a radiation-resistant shielding cavity, and the shaping cover 74 and the reflector 75 are fixedly connected to form a reflective cavity. The shaping cover 74 has two limiting holes 741 (round holes that can fit with the transmitter 73 with a clearance) and two shaping holes 742. The two shaping holes 742 are arranged symmetrically vertically, and the two limiting holes 741 are symmetrically located on the left and right sides of the shaping holes 742. A PCB substrate 76 is fixedly connected within a radiation-shielding cavity. Two emitters 73 pass through two limiting holes 741, with their light-emitting surfaces extending into the reflective cavity. Two receivers 72 are directly opposite the two shaping holes 742. A light-transmitting hole 81 is provided in the lower middle part of a light-shielding plate 8. The light-shielding plate 8 is inserted into the reflective cavity and can move relative to it. The reflected light passes through the two shaping holes 742 and reaches part of the photosensitive surface of the two receivers 72 through the light-transmitting hole 81. The radiation-shielding cavity formed by the fixed connection of the shielding plate 71 and the shaping cover 74 protects the emitters 73 and receivers 72 from radiation. The reflective cavity formed by the fixed connection of the shaping cover 74 and the reflector 75 provides better light quality while blocking external light.

[0034] In some embodiments, the shaping aperture 742 is a square aperture, and the light-transmitting aperture 81 is a square aperture. The width of the light-transmitting aperture 81 in the vertical direction is greater than d1 and less than d2. Here, d1 represents the distance between the lower edge of the upper shaping aperture 742 and the upper edge of the lower shaping aperture 742 (i.e., the vertical width of the gap between the two shaping apertures 742), and d2 represents the distance between the upper edge of the upper shaping aperture 742 and the lower edge of the lower shaping aperture 742. Since both the shaping aperture 742 and the light-transmitting aperture 81 are square apertures, the lower edge of the upper shaping aperture 742 and the upper edge of the lower shaping aperture 742 are parallel to each other, with the zero point centered, avoiding an increase in signal nonlinearity. When the light-shielding plate 8 moves, the area of ​​the photosensitive surface of the two receivers 72 that receives the light signal changes. The angle of deflection of the light-shielding plate is calculated based on this area change to achieve the measurement of the deflection angle (i.e., deflection angular displacement) of the reflecting mirror.

[0035] In some embodiments, the shielding plate 71 and the shaping cover 74 are fixedly connected by adhesive.

[0036] In some embodiments, the PCB substrate 76 is square, with notches 761 extending front-to-back at both upper corners and first through holes 762 extending front-to-back at both lower corners. The shaping cover 74 has second through holes 743 extending front-to-back at both upper corners and first blind holes with threads extending front-to-back at both lower corners. The shaping cover 74 has third through holes 744 extending vertically at both lower supports. The reflector 75 has locking screw holes 751 on its left and right connecting posts, and a second blind hole with threads extending vertically at its bottom. Two screws 11 are screwed through two first through holes 762 and two first blind holes respectively. Two screws 11 are screwed through two notches 761, through two second through holes 743 and two locking screw holes 751 respectively. Two screws 11 are screwed through two third through holes 744 and two second blind holes respectively, thereby realizing the fixed connection between the PCB substrate 76 and the shaping cover 74 and the shaping cover 74 and the reflector 75.

[0037] In some embodiments, the shielding plate 71 is made of tantalum metal and the shaping cover 74 is made of aluminum alloy, which is low in cost and has good radiation resistance.

[0038] In some embodiments, the inner surface of the reflector 75 is a diffuse reflective surface, and the reflective cavity is a diffuse reflective cavity, thereby making the reflected light soft and uniform and improving the sensor performance.

[0039] In the initial state (i.e., the static state), the left and right edges of the light-transmitting aperture 81 are perpendicular to the upper and lower edges of the shaping aperture 742. The center lines of the two light-transmitting apertures 81 are collinear with the corresponding two rotation axes of the flexible hinge 2. The center lines of the light-transmitting aperture 81, the upper shaping aperture 742, and the lower shaping aperture 742 are all parallel to each other and lie in the same plane. In the initial state, the photosensitive areas of the two receivers 72 (i.e., the areas of the photosensitive surfaces of the receivers 72 that can receive reflected light) are equal.

[0040] The working process of this utility model is as follows:

[0041] When the reflective lens 4 needs to deflect around a rotation axis, the motor movers 6 of the two voice coil motors located on one side of the rotation axis are controlled to move upward, pushing the connection of the lens frame 3 connected to it to produce an upward displacement. The motor movers 6 of the two voice coil motors located on the other side of the rotation axis are controlled to move downward, pushing the connection of the lens frame 3 connected to it to produce a downward displacement. The center of the lens frame 3 is fixed to the upper end face of the flexible hinge 2. The stiffness of the flexible hinge 2 in the vertical direction is very high, and the stiffness in other motion directions is very low. This causes the lens frame 3 to drive the reflective lens 4 to rotate around the center of motion of the flexible hinge 2 (i.e., deflect around the rotation axis). During the deflection of the reflective lens 4, the light shield 8 corresponding to the light-transmitting hole 81 collinear with the rotation axis deflects around the fixed point. The photosensitive area of ​​one receiver 72 of the corresponding photoelectric displacement sensor increases, and the photosensitive area of ​​the other receiver 72 decreases by the same amount. The changing photosensitive area signal is calculated (the calculation method belongs to the prior art) to obtain the deflection angle of the light shield 8. The deflection angle of the light shield 8 is the amount of change in the deflection angle of the reflective lens 4. The change in the deflection angle of the reflector 4 is fed back to the control system, thereby controlling and correcting the driving force of the four voice coil motors, and realizing closed-loop control of the deflection angle of the reflector 4 around the rotation axis.

[0042] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A dual-axis fast-reflecting mirror, comprising a base (1), a flexible hinge (2), a mirror frame (3), a reflecting mirror (4), four identical drive components, and two identical sets of sensors, wherein the lower end of the flexible hinge (2) is fixed to the center of the base (1), and the upper end is fixedly connected to the mirror frame (3), and the reflecting mirror (4) is fixedly mounted on the mirror frame (3); characterized in that: The driving component is a voice coil motor, which includes a motor stator (5) and a motor mover (6); the four motor stators (5) are fixed on the base (1) in a cross shape, and the four motor movers (6) are fixed on the lower surface of the four lugs of the frame (3) in a cross shape, and correspond to the four motor stators (5) respectively. The sensor is a photoelectric displacement sensor, which includes an anti-radiation sensing module (7) and a light shield (8). The anti-radiation sensing modules (7) of the two sets of sensors are fixed perpendicularly to each other on the base (1) and are spaced at a 45° angle from the adjacent motor stator (5). The light shields (8) of the two sets of sensors are fixed perpendicularly to each other on the frame (3) and are spaced at a 45° angle from the adjacent motor mover (6). The light shield (8) is inserted into the anti-radiation sensing module (7) and can change the photosensitive area of ​​the anti-radiation sensing module (7) when it moves relative to the anti-radiation sensing module (7).

2. The biaxial fast-reflecting mirror according to claim 1, characterized in that: The dual-axis fast-reflecting mirror also includes a protective cover (9) and a bottom cover (10); the center of the protective cover (9) is provided with a light-transmitting hole (91) corresponding to the reflective lens (4), the protective cover (9) is fixedly connected to the base (1), and covers the flexible hinge (2), the mirror frame (3), the reflective lens (4), the same four drive components and the same two sets of displacement sensors; the bottom cover (10) is fixedly connected to the bottom surface of the base (1).

3. The biaxial fast-reflecting mirror according to claim 2, characterized in that: A set of sensors consists of a photoelectric displacement sensor. The two radiation-resistant sensing modules (7) of the two sets of sensors are fixed on the base (1) at a 90° interval and at a 45° angle to the adjacent motor stator (5). The two light-shielding plates (8) of the two sets of sensors are fixedly connected to the frame (3) at a 90° interval and at a 45° angle to the adjacent motor mover (6).

4. The biaxial fast-reflecting mirror according to claim 2, characterized in that: A set of sensors consists of two photoelectric displacement sensors. The four radiation-resistant sensing modules (7) of the two sets of sensors are fixed on the base (1) in a cross shape and are spaced at a 45° angle from the adjacent motor stator (5). The four light-shielding plates (8) of the two sets of sensors are fixed on the frame (3) in a cross shape and are spaced at a 45° angle from the adjacent motor mover (6).

5. The biaxial fast-reflecting mirror according to claim 3 or 4, characterized in that: The radiation-resistant sensing module (7) includes a shielding plate (71), a receiver (72), a transmitter (73), a shaping cover (74), a reflector (75), and a PCB substrate (76). The receiver (72) and the transmitter (73) are soldered onto the PCB substrate (76). The shielding plate (71) and the shaping cover (74) are both made of metal. The shielding plate (71) and the shaping cover (74) are fixedly connected to form a radiation-resistant shielding cavity, and the shaping cover (74) and the reflector (75) are fixedly connected to form a reflective cavity. The shaping cover (74) has an opening on it. The PCB substrate (76) is fixedly connected to the radiation shielding cavity, with a limiting hole (741) and a shaping hole (742). The emitter (73) passes through the limiting hole (741) and its light-emitting surface extends into the reflective light cavity. The receiver (72) is directly opposite the shaping hole (742). The light shield (8) has a light-transmitting hole (81) and is inserted into the reflective light cavity. It can move relative to the reflective light cavity. The reflected light can pass through the shaping hole (742) and reach part of the photosensitive surface of the receiver (72) through the light-transmitting hole (81).

6. The biaxial fast-reflecting mirror according to claim 5, characterized in that: The shielding plate (71) is made of tantalum metal, and the shaping cover (74) is made of aluminum alloy.

7. The biaxial fast-reflecting mirror according to claim 5, characterized in that: The inner surface of the reflector (75) is a diffuse reflective surface, and the reflective cavity is a diffuse reflective cavity.

8. The biaxial fast-reflecting mirror according to claim 5, characterized in that: There are two receivers (72), which are arranged symmetrically vertically; there are two transmitters (73), which are symmetrically located on the left and right sides of the receivers (72); there are two shaping holes (742), which are arranged symmetrically vertically; there are two limiting holes (741), which are symmetrically located on the left and right sides of the shaping holes (742).

9. The biaxial fast-reflecting mirror according to claim 8, characterized in that: The mounting hole (82) for fixing the light shield (8) to the frame (3) is an elliptical hole at the upper end of the light shield (8). The shaping hole (742) is a square hole, and the light-transmitting hole (81) is a square hole. The width of the light-transmitting hole (81) in the vertical direction is greater than d1 and less than d2. Wherein, d1 represents the distance between the lower edge of the upper shaping hole (742) and the upper edge of the lower shaping hole (742), and d2 represents the distance between the upper edge of the upper shaping hole (742) and the lower edge of the lower shaping hole (742).

10. The biaxial fast-reflecting mirror according to claim 9, characterized in that: In the initial state, the left and right edges of the light-transmitting hole (81) are perpendicular to the upper and lower edges of the shaping hole (742), the center line of the light-transmitting hole (81) is collinear with the corresponding rotation axis of the flexible hinge (2), and the center line of the light-transmitting hole (81), the center line of the upper shaping hole (742), and the center line of the lower shaping hole (742) are parallel to each other and are in the same plane.

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