Electromagnetic drive and support structure of a two-dimensional fast reflection mirror

Abstract

The invention discloses an electromagnetic drive and support structure of a two-dimensional fast reflector, including a reflector, a reflector bracket, a rigid support assembly, a voice coil motor, a base and a shell; the reflector is supported by the reflector bracket on the rigid bearing assembly; the reflector bracket rotates around a first axis relative to the rigid bearing assembly; the rigid bearing assembly is supported on the shell; the rigid bearing assembly rotates around a second axis relative to the shell; the shell is fixed on the base; the voice coil motor is fixed between the shell and the base. The invention can realize two-dimensional co-pivot rotation, reaching a mirror deflection angle of more than ±20°; can resist large impact vibration; and can also save the axial height of the fast reflector device, making the structure of the device more compact.

Description

Technical Field

[0001] The invention relates to the technical field of photoelectric scanning and tracking, and in particular to an electromagnetic drive and support structure of a two-dimensional fast reflection mirror. Background Art

[0002] A fast reflector is a component that works between a light source or receiver and a target to adjust and stabilize the optical system's line of sight or beam pointing. It uses a voice coil motor to precisely control the reflector's deflection direction and thus the beam's deflection angle, and is used to achieve rapid adjustment of the reflector's "deflection-tilt" azimuth angle. It can be used for applications such as line of sight stabilization or scanning compensation in the optoelectronics field. Due to its compact structure, fast response speed, high working bandwidth, and high pointing accuracy, it is widely used in astronomical telescopes, adaptive optics, image motion compensation, free-space optical communications, precision tracking, and other fields, and has become a key device for stabilizing beams and correcting beam propagation directions in optical systems.

[0003] Traditional 2D fast reflectors generally include four voice coil motors, with two voice coil motors forming a push-pull pair to form a rotation axis, providing smooth and uniform torque for the reflector.

[0004] A part of the existing fast reflector adopts a moving iron voice coil motor based on the reluctance principle. Compared with the traditional moving magnet and moving coil voice coil motors, this type of voice coil motor can achieve a larger angle of deflection without considering the gap between the coil and the magnetic cylinder, thereby increasing the magnetic field strength generated by the coil; and avoiding the cable dragging and coil heat dissipation problems of the moving coil voice coil motor. However, the existing moving iron voice coil motor based on the reluctance principle has the following two problems: one is that the permanent magnet is directly installed on the lower surface of the reflector bracket, which has the same problem as the moving magnet voice coil motor, that is, the mass of the mover is increased, which will still significantly reduce the rotation angle of the motor; the second is that the coil is placed in the space below the permanent magnet. Due to the need to achieve a large angle of deflection and install the position sensor, sufficient space needs to be reserved in the axial direction for work, which will significantly increase the height of the device and the space utilization rate is not high. Summary of the invention

[0005] The object of the present invention is to provide an electromagnetic drive and support structure for a two-dimensional rapid reflection mirror, which is used to solve at least one of the above-mentioned technical problems. It can realize two-dimensional co-pivot rotation and achieve a mirror deflection angle of more than ±20°; it can withstand large impact vibrations; and it can also save the axial height of the rapid reflection mirror device, making the structure of the device more compact.

[0006] The embodiment of the present invention is achieved as follows:

[0007] An electromagnetic drive and support structure of a two-dimensional fast reflector comprises a reflector, a reflector bracket, a rigid support component, a voice coil motor, a base and a shell.

[0008] The reflector is supported by the reflector bracket on the rigid bearing assembly.

[0009] The reflector mount rotates relative to the rigid bearing assembly about a first axis.

[0010] The rigid bearing assembly is supported on the housing.

[0011] The rigid bearing assembly rotates relative to the housing about a second axis.

[0012] The shell is fixed on the base.

[0013] The voice coil motor is fixed between the shell and the base.

[0014] The technical effect is that the moving-iron voice coil driving device using the magnetic resistance principle can achieve a larger mirror rotation angle range and save the axial height of the fast-reflecting mirror device, making the structure of the device more compact and convenient for installation.

[0015] In a preferred embodiment of the present invention, the rigid support assembly of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror comprises a bearing ring, a bearing bracket and a rigid shaft.

[0016] There are two groups of bearing rings and two groups of corresponding rigid shafts.

[0017] A first set of the rigid shafts are supported between the bearing support and the reflector support by a first set of the bearing rings.

[0018] The second set of rigid shafts is supported between the bearing support and the housing by a second set of bearing rings.

[0019] In a preferred embodiment of the present invention, the mirror bracket of the electromagnetic drive and support structure of the two-dimensional fast mirror is provided with a first group of rigid shaft mounting holes, and the bearing bracket is correspondingly provided with a second group of rigid shaft mounting holes.

[0020] A first set of the bearing rings are supported within the first set of rigid shaft mounting holes.

[0021] One end of the first group of rigid shafts is supported in the first group of bearing rings, and the other end is supported in the second group of rigid shaft mounting holes, so that the reflector bracket rotates around the first axis.

[0022] In a preferred embodiment of the present invention, a third group of rigid shaft mounting holes is provided on the bearing bracket of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror, and a fourth group of rigid shaft mounting holes is correspondingly provided on the shell.

[0023] A second set of said bearing rings are supported within said third set of rigid shaft mounting holes.

[0024] One end of the second group of rigid shafts is supported in the second group of bearing rings, and the other end is supported in the fourth group of rigid shaft mounting holes, so that the bearing bracket rotates around the second shaft.

[0025] The technical effect is that the rigid support component with frame design enables the fast reflector to have a larger rotation angle range, and greatly improves the anti-impact and vibration performance. The elastic structure design avoids the influence of the lateral clearance of the bearing on the pointing accuracy of the system.

[0026] In a preferred embodiment of the present invention, the bearing ring of the electromagnetic drive and support structure of the above-mentioned two-dimensional fast reflection mirror is made of brass and / or bronze and / or plastic and / or Teflon and / or glass and / or silicon nitride and / or zirconium oxide and / or aluminum oxide and / or silicon carbide and / or chromium materials, and other metals may also be used.

[0027] In a preferred embodiment of the present invention, a first group of spring sheets is provided between one end of the first group of rigid shafts of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror and the reflection mirror bracket.

[0028] In a preferred embodiment of the present invention, a second group of spring sheets is provided between one end of the second group of rigid shafts of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror and the bearing bracket.

[0029] The technical effect is that the mechanical clearance can be reduced.

[0030] In a preferred embodiment of the present invention, the voice coil motor of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror includes a coil assembly and a magnet assembly.

[0031] There are four coil assemblies, two in a group, which are symmetrically fixed on the base in pairs around the central axis.

[0032] The magnet assembly is mounted on the base and located at the central axis.

[0033] The technical effect is that the existing two coils are replaced by four coils arranged in groups of two and relatively placed outside the rigid support component, which can save the axial height of the fast reflection mirror device and make the structure of the device more compact.

[0034] In a preferred embodiment of the present invention, the magnet assembly of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror includes a permanent magnet and a magnetic conductor.

[0035] The permanent magnet is fixed on the base and is located at the central axis.

[0036] The magnetic conductor is fixed on the permanent magnet.

[0037] The permanent magnet is made of but not limited to N48SH neodymium iron boron material, and samarium cobalt SmCo33EN5300, NSOM and other materials can also be used.

[0038] The magnetic conductor is made of but not limited to DT4 electrical soft iron material, and can also be made of Fe-Ni soft magnetic alloy, magnetically conductive stainless steel material, electrical steel, ferrite, NiZnCu ferrite and other materials.

[0039] The technical effect is that the permanent magnet fixed on the lower surface of the reflector bracket is separated and fixed on the base, which can reduce the weight of the mover and increase the angular range of the mirror.

[0040] In a preferred embodiment of the present invention, a coil groove is provided on the base of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror.

[0041] Each of the coil assemblies includes a coil and an iron core.

[0042] The coil comprises a coil frame and a plurality of turns of enameled wire wound on the coil frame.

[0043] The coil is mounted on the coil slot.

[0044] The iron core is placed in the coil frame.

[0045] The technical effect is that the iron core is placed in the inner hole of the coil frame, and the fan-shaped part of the iron core reduces the air gap with the bearing bracket as much as possible without affecting the mirror deflection, so as to enhance the output of the motor.

[0046] The beneficial effects of the embodiments of the present invention are:

[0047] The electromagnetic drive and support structure of the two-dimensional fast reflector of the present invention adopts a moving iron voice coil drive device based on the magnetic resistance principle, separates the permanent magnet fixed to the lower surface of the reflector bracket from the reflector bracket, and fixes it on the base, which can reduce the weight of the mover and increase the angular range of the mirror. The structure adopts a structure in which four coils are arranged in groups of two and are relatively placed on the outside of the rigid support component, which saves the axial height of the fast reflector device and makes the structure of the device more compact. The rigid support component with a frame design enables the fast reflector to have a larger angular range and greatly improves the impact and vibration resistance. In addition, the elastic structure design is adopted to avoid the influence of the lateral clearance of the bearing on the pointing accuracy of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 It is a schematic diagram of the exploded structure of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror of the present invention;

[0050] Figure 2 A schematic diagram of a cross-sectional structure of one side of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror of the present invention;

[0051] Figure 3 for Figure 2 A schematic diagram of the side cross-sectional structure obtained by rotating 45° clockwise around the Z axis;

[0052] Figure 4 It is a schematic diagram of a top view cross-sectional structure of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror of the present invention;

[0053] Figure 5 The figure is a schematic diagram of the magnetic pole distribution and magnetic circuit structure of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror of the present invention.

[0054] In the figure: 1-shell; 2-reflector; 3-reflector bracket; 4-spring sheet; 5-bearing ring; 6-rigid shaft; 7-bearing bracket; 8-magnetic conductor; 9-permanent magnet; 10-iron core; 11-coil; 12-base; 13-first axis; 14 second axis. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0056] Please refer to Figures 1 to 4 An embodiment of the present invention provides an electromagnetic drive and support structure of a two-dimensional fast reflector, which includes a reflector 2, a reflector bracket 3, a rigid support component, a voice coil motor, a base 12 and a shell 1.

[0057] The reflector 2 is supported on the rigid bearing assembly by the reflector bracket 3 .

[0058] The reflector support 3 rotates around a first axis 13 relative to the rigid bearing assembly.

[0059] The rigid bearing assembly is supported on the housing 1 .

[0060] The rigid bearing assembly rotates relative to the housing 1 about a second axis 14 .

[0061] The housing 1 is fixed on the base 12 .

[0062] The voice coil motor is fixed between the housing 1 and the base 12 .

[0063] The technical effect is that the moving-iron voice coil driving device using the magnetic resistance principle can achieve a larger mirror rotation angle range and save the axial height of the fast-reflecting mirror device, making the structure of the device more compact and convenient for installation.

[0064] In a preferred embodiment of the present invention, the rigid support component of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror includes a bearing ring 5 , a bearing bracket 7 and a rigid shaft 6 .

[0065] There are two groups of bearing rings 5 ​​and two groups of corresponding rigid shafts 6 .

[0066] The first set of rigid shafts 6 are supported between the bearing bracket 7 and the reflector bracket 3 via the first set of bearing rings 5 ​​.

[0067] The second set of rigid shafts 6 are supported between the bearing bracket 7 and the housing 1 by means of the second set of bearing rings 5 ​​.

[0068] In a preferred embodiment of the present invention, the mirror bracket 3 of the electromagnetic drive and support structure of the two-dimensional fast mirror is provided with a first group of rigid shaft mounting holes, and the bearing bracket 7 is correspondingly provided with a second group of rigid shaft mounting holes.

[0069] The first set of bearing rings 5 ​​are supported in the first set of rigid shaft mounting holes.

[0070] One end of the first group of rigid shafts 6 is supported in the first group of bearing rings 5 ​​, and the other end is supported in the second group of rigid shaft mounting holes, so that the reflector bracket 3 rotates around the first axis 13 .

[0071] In a preferred embodiment of the present invention, a third group of rigid shaft mounting holes is provided on the bearing bracket 7 of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror, and a fourth group of rigid shaft mounting holes is correspondingly provided on the housing 1.

[0072] The second set of bearing rings 5 ​​are supported in the third set of rigid shaft mounting holes.

[0073] One end of the second group of rigid shafts 6 is supported in the second group of bearing rings 5 ​​, and the other end is supported in the fourth group of rigid shaft mounting holes, so that the bearing bracket 7 rotates around the second shaft 14 .

[0074] The technical effect is that the rigid support component with frame design enables the fast reflector to have a larger rotation angle range, and greatly improves the anti-impact and vibration performance. The elastic structure design avoids the influence of the lateral clearance of the bearing on the pointing accuracy of the system.

[0075] In a preferred embodiment of the present invention, the bearing ring 5 of the electromagnetic drive and support structure of the above-mentioned two-dimensional fast reflection mirror is made of brass and / or bronze and / or plastic and / or Teflon and / or glass and / or silicon nitride and / or zirconium oxide and / or aluminum oxide and / or silicon carbide and / or chromium materials, and other metals may also be used.

[0076] In a preferred embodiment of the present invention, a first group of spring sheets 4 is provided between one end of the first group of rigid shafts 6 of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror and the reflection mirror bracket 3 .

[0077] In a preferred embodiment of the present invention, a second group of spring sheets 4 is provided between one end of the second group of rigid shafts 6 and the bearing bracket 7 of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror.

[0078] The technical effect is that the mechanical clearance can be reduced.

[0079] In a preferred embodiment of the present invention, the voice coil motor of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror includes a coil assembly and a magnet assembly.

[0080] There are four coil assemblies, two in a group, which are symmetrically fixed on the base 12 around the central axis.

[0081] The magnet assembly is mounted on the base 12 and is located at the central axis.

[0082] The technical effect is that the existing two coils are replaced by four coils arranged in groups of two and relatively placed outside the rigid support component, which can save the axial height of the fast reflection mirror device and make the structure of the device more compact.

[0083] In a preferred embodiment of the present invention, the magnet assembly of the electromagnetic drive and support structure of the above-mentioned two-dimensional fast reflection mirror includes a permanent magnet 9 and a magnetic conductor 8.

[0084] The permanent magnet 9 is fixed on the base 12 and is located at the central axis.

[0085] The magnetic conductor 8 is fixed on the permanent magnet 9 .

[0086] The permanent magnet 9 is made of but not limited to N48SH neodymium iron boron material, and may also be made of samarium cobalt SmCo33EN5300, NSOM and other materials.

[0087] The magnetic conductor 8 is made of but not limited to DT4 electrical soft iron material, and can also be made of Fe-Ni soft magnetic alloy, magnetically conductive stainless steel material, electrical steel, ferrite, NiZnCu ferrite and other materials.

[0088] The technical effect is that the permanent magnet 9 fixed to the lower surface of the reflector bracket 3 is separated and fixed to the base 12, which can reduce the weight of the mover and increase the angular range of the mirror.

[0089] In a preferred embodiment of the present invention, a coil groove is provided on the base 12 of the electromagnetic drive and support structure of the two-dimensional fast reflection mirror.

[0090] Each of the coil assemblies includes a coil 11 and an iron core 10 .

[0091] The coil 11 includes a coil frame and a plurality of turns of enameled wire wound on the coil frame.

[0092] The coil 11 is installed on the coil slot.

[0093] The iron core 10 is placed in the coil frame.

[0094] The technical effect is that the iron core 10 is placed in the inner hole of the coil frame, and the fan-shaped part of the iron core 10 reduces the air gap with the bearing bracket 7 as much as possible without affecting the mirror deflection, so as to enhance the output of the motor.

[0095] Please refer to Figure 5 , Figure 5 The present invention provides a schematic diagram of the magnetic pole distribution and magnetic circuit of the electromagnetic drive and support structure of the two-dimensional fast reflector, which is a schematic diagram of a set of motor magnetic circuits in one dimension of the device. In the figure, the upper side of the permanent magnet 9 is the S pole and the lower side is the N pole. The magnetic field inside the magnet flows from the S pole to the N pole, and returns to the S pole of the permanent magnet 9 through the base 12, the reflector bracket 3, the central iron core 10 and the magnetic conductor 8, forming two loops on the left and the right. When the coil 11 is not powered, the position of the reflector can be kept stable. When the current of the left coil 11 flows in from the right side and flows out from the left side; when the current of the right coil 11 flows in from the left side and flows out from the right side, the coil magnetic field will form a counterclockwise loop. According to the principle of minimum magnetic resistance, the reflector bracket 3 will rotate toward the position with the minimum magnetic resistance, so that the reflector 2 deflects counterclockwise along the X axis. If the direction of the current flowing into the coils 11 on both sides is changed at the same time, the magnetic circuit direction of the magnetic field generated by the coil will be opposite, and the reflector 2 will deflect clockwise around the X axis.

[0096] The embodiment of the present invention aims to protect an electromagnetic drive and support structure of a two-dimensional fast reflection mirror, and has the following effects:

[0097] 1. The electromagnetic drive and support structure of the two-dimensional fast reflector provided by the present invention adopts a moving iron voice coil drive device based on the magnetic resistance principle, separates the permanent magnet (9) fixed to the lower surface of the reflector bracket (2) from the reflector bracket (2), and fixes it on a base (12), thereby reducing the weight of the mover and increasing the angular range of the mirror surface.

[0098] 2. The structure in which four coils are arranged in pairs and placed relatively on the outside of the rigid support assembly saves the axial height of the fast reflection mirror device and makes the structure of the device more compact.

[0099] 3. The rigid support assembly with frame design enables the fast reflector to have a larger rotation angle range and greatly improves the anti-impact and vibration performance. The elastic structure design avoids the influence of the lateral clearance of the bearing on the pointing accuracy of the system.

[0100] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. An electromagnetic drive and support structure for a two-dimensional fast reflection mirror, characterized in that: It comprises a reflector (2), a reflector bracket (3), a rigid support component, a voice coil motor, a base (12) and a housing (1); The reflector (2) is supported on the rigid support assembly by the reflector bracket (3); The reflector bracket (3) rotates around a first axis (13) relative to the rigid support assembly; The rigid support assembly is supported on the shell (1); The rigid support assembly rotates relative to the housing (1) around a second axis (14); The shell (1) is fixed on the base (12); The voice coil motor is fixed between the housing (1) and the base (12); The rigid support assembly comprises a bearing ring (5), a bearing bracket (7) and a rigid shaft (6); There are two groups of bearing rings (5), and there are also two groups of corresponding rigid shafts (6); The first group of rigid shafts (6) are supported between the bearing bracket (7) and the reflector bracket (3) through the first group of bearing rings (5); The second group of rigid shafts (6) are supported between the bearing bracket (7) and the housing (1) through the second group of bearing rings (5); The voice coil motor comprises a coil assembly and a magnet assembly; The coil assemblies are grouped in pairs and fixed on the base (12) symmetrically around the central axis. The base (12) is provided with a coil slot. Each coil assembly comprises a coil (11) and an iron core (10). The coil (11) comprises a coil frame and a plurality of turns of enameled wire wound on the coil frame. The coil (11) is mounted on the coil slot, and the iron core (10) is placed in the coil frame. The magnet assembly is mounted on the base (12) and is located at the central axis. The magnet assembly comprises a permanent magnet (9) and a magnet conductor (8). The permanent magnet (9) is fixed on the base (12) and is located at the central axis. The magnet conductor (8) is fixed on the permanent magnet (9).

2. The electromagnetic drive and support structure of the two-dimensional fast reflection mirror according to claim 1, characterized in that: The reflector bracket (3) is provided with a first group of rigid shaft mounting holes, and the bearing bracket (7) is correspondingly provided with a second group of rigid shaft mounting holes; The first group of bearing rings (5) are supported in the first group of rigid shaft mounting holes; One end of the first group of rigid shafts (6) is supported in the first group of bearing rings (5), and the other end is supported in the second group of rigid shaft mounting holes, so that the reflector bracket (3) rotates around the first shaft (13).

3. The electromagnetic drive and support structure of the two-dimensional fast reflection mirror according to claim 1, characterized in that: The bearing bracket (7) is provided with a third group of rigid shaft mounting holes, and the housing (1) is correspondingly provided with a fourth group of rigid shaft mounting holes; The second group of bearing rings (5) are supported in the third group of rigid shaft mounting holes; One end of the second group of rigid shafts (6) is supported in the second group of bearing rings (5), and the other end is supported in the fourth group of rigid shaft mounting holes, so that the bearing bracket (7) rotates around the second shaft (14).

4. The electromagnetic drive and support structure of the two-dimensional fast reflection mirror according to claim 1, characterized in that: The bearing ring (5) is made of brass and / or bronze and / or plastic and / or Teflon and / or glass and / or silicon nitride and / or zirconium oxide and / or aluminum oxide and / or silicon carbide and / or chromium.

5. The electromagnetic drive and support structure of the two-dimensional fast reflection mirror according to claim 2, characterized in that: A first group of spring sheets (4) is provided between one end of the first group of rigid shafts (6) and the reflector bracket (3).

6. The electromagnetic drive and support structure of the two-dimensional fast reflection mirror according to claim 3, characterized in that: A second group of spring sheets (4) is provided between one end of the second group of rigid shafts (6) and the bearing bracket (7).

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