T-shaped voice coil motor and fast reflector

Abstract

The utility model provides a T-shaped voice coil motor and a fast reflector. The T-shaped voice coil motor comprises a T-shaped base, two magnetic steel assemblies, third magnetic steel and a rotor coil. The T-shaped base comprises a transverse base and a longitudinal base, and the longitudinal base is vertically arranged in the middle of the first surface of the transverse base; the two magnetic steel assemblies comprise first magnetic steel, back iron and second magnetic steel which are sequentially stacked from bottom to top, the magnetizing directions of the first magnetic steel and the second magnetic steel are opposite, and the first magnetic steel is fixed to the two ends of the first surface of the transverse base respectively; the third magnetic steel is fixed on the longitudinal base, and the magnetizing directions of the third magnetic steel and the second magnetic steel are opposite; the mover coil is wound around the longitudinal base, and gaps are formed between the mover coil and the longitudinal base and between the mover coil and the third magnetic steel. According to the T-shaped voice coil motor and the fast reflecting mirror provided by the utility model, the T-shaped voice coil motor has the advantages of small size and large thrust, is applied to the fast reflecting mirror, and can obtain a larger rotation angle range and a higher working bandwidth.

Description

Technical Field

[0001] The utility model belongs to the field of integrated circuit equipment manufacturing and relates to a T-shaped voice coil motor and a fast reflecting mirror. Background Art

[0002] The voice coil motor is a special form of direct drive motor with the advantages of simple structure, small size, high acceleration and fast response. The working principle of the voice coil motor is to place the coil in a magnetic field to generate a force, and the magnitude of the force is proportional to the current flowing through the coil. Since high-speed and high-precision motion control is required in the semiconductor manufacturing and packaging process, the advantages of the voice coil motor can just meet these needs. At the same time, with the rapid development of voice coil motor technology, voice coil motors are also widely used in precision positioning systems such as disk and laser disc positioning.

[0003] like Figure 1 As shown, an E-shaped voice coil motor 1 in the prior art includes an E-shaped base 10, a left magnetic steel 11a, a right magnetic steel 11b and a moving coil 12. Figure 2 As shown, the magnetic lines of force of the E-shaped voice coil motor 1 have two paths. The first path: flows from the left magnetic steel 11a into the movable coil 12, then flows from the movable coil 12 into the E-shaped base 10, and finally flows from the E-shaped base 10 into the left magnetic steel 11a, forming a closed loop. The second path: flows from the right magnetic steel 11b into the movable coil 12, then flows from the movable coil 12 into the E-shaped base 10, and finally flows from the E-shaped base 10 into the right magnetic steel 11b, forming a closed loop. The E-shaped voice coil motor 1 of this structure has the disadvantages of severe magnetic leakage, low coil utilization, high power consumption and difficulty in magnetic steel processing.

[0004] A fast reflector is a component that works between a light source (or receiver) and a target and is used to adjust and stabilize the optical system's line of sight or beam pointing. By using a voice coil motor to precisely control the reflector's deflection direction, the beam's deflection angle can be precisely controlled, thereby achieving a "deflection-tilt" rapid adjustment of the reflector's azimuth angle, which can be used for applications such as line of sight stabilization or scanning compensation in the optoelectronic field. Due to the advantages of compact structure, fast response speed, and high pointing accuracy, the fast reflector can be widely used in astronomical telescopes, laser communications, image stabilization systems, adaptive systems, tracking and aiming, and laser emission optical systems. At the same time, the basic technical requirements for a fast reflector to have the above advantages are: small size, light weight, small moment of inertia, large servo bandwidth (the larger the bandwidth, the stronger the ability to suppress high-frequency interference) and high structural resonance frequency (a high resonance frequency can ensure that the system has sufficient servo bandwidth).

[0005] Fast mirrors have made great progress in the field of optics over the years. However, large-aperture fast mirrors need to achieve a high working bandwidth, but they have a large moment of inertia, so they require a motor with a large thrust. At the same time, alternative motors used in fast mirrors, such as stepper motors or brushless servo motors, have the disadvantage of being too large.

[0006] Therefore, in order to make up for the shortcomings of the current voice coil motors used in fast reflectors, such as large size, small thrust, and great processing difficulty, it is necessary to further improve the structure of the voice coil motors.

[0007] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the utility model and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the utility model. Utility Model Content

[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a T-shaped voice coil motor and a fast reflector to solve the problem that the voice coil motor in the prior art has large size, small thrust, and great processing difficulty, which limits the application of the fast reflector.

[0009] To achieve the above-mentioned purpose and other related purposes, the utility model provides a T-shaped voice coil motor, the T-shaped voice coil motor comprising: a T-shaped base, the T-shaped base comprising a transverse base and a longitudinal base, the longitudinal base being vertically arranged at a middle position of a first surface of the transverse base;

[0010] Two magnetic steel assemblies, the magnetic steel assemblies comprising a first magnetic steel, a back iron and a second magnetic steel stacked in sequence from bottom to top, the magnetization direction of the first magnetic steel is opposite to the magnetization direction of the second magnetic steel, and the first magnetic steels of the two magnetic steel assemblies are respectively fixed to the two ends of the first surface of the transverse base;

[0011] a third magnetic steel, the third magnetic steel being fixed on the longitudinal base, and the magnetization direction of the third magnetic steel being opposite to the magnetization direction of the second magnetic steel;

[0012] The movable coil is wound around the longitudinal base, and gaps are arranged between the movable coil, the longitudinal base and the third magnetic steel.

[0013] Optionally, the shapes of the first magnetic steel, the back iron, the second magnetic steel and the third magnetic steel are respectively set to be a cube, a prism or a pyramid.

[0014] Optionally, in the vertical direction of the longitudinal base, the size of the back iron is 1 / 3 to 2 / 3 of the size of the first magnetic steel.

[0015] Optionally, in the vertical direction of the longitudinal base, the size of the second magnetic steel is 3 / 5 to 4 / 5 of the size of the first magnetic steel.

[0016] Optionally, in the vertical direction of the longitudinal base, the size of the third magnetic steel is 3 / 5 to 4 / 5 of the size of the first magnetic steel.

[0017] Optionally, the upper end of the third magnetic steel is flush with the upper end of the second magnetic steel.

[0018] Optionally, the first magnetic steel, the back iron, the second magnetic steel, the third magnetic steel and the T-shaped base are all fixed by bonding.

[0019] The utility model also provides a fast reflector, which comprises: a reflector device and the T-shaped voice coil motor;

[0020] The reflector device is connected to the moving coil of the T-shaped voice coil motor, and the T-shaped voice coil motor is arranged on the periphery of the reflector device.

[0021] Optionally, the fast reflector further comprises a base, and the reflector device and the T-shaped voice coil motor are both arranged on the base.

[0022] Optionally, the number of the T-shaped voice coil motors is set to 4, and the four T-shaped voice coil motors are arranged in pairs around the reflector device.

[0023] As described above, the utility model provides a T-shaped voice coil motor and a fast reflector, which have the following beneficial effects:

[0024] 1. The T-shaped voice coil motor of the utility model has a small size and four magnetic lines of force paths, so it has the advantages of large thrust, low loss, compact magnetic circuit and high coil utilization rate; at the same time, the magnetic steel in the T-shaped voice coil motor is axially magnetized, with low processing difficulty and low cost.

[0025] 2. The T-shaped voice coil motor of the utility model is applied to a fast reflector, and can obtain a larger rotation angle range and a higher working bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure shows an axonometric view of the three-dimensional structure of an E-shaped voice coil motor in the prior art.

[0027] Figure 2 Shown is a magnetic field line diagram of an E-shaped voice coil motor in the prior art.

[0028] Figure 3 Shown is an exploded view of the three-dimensional structure of the T-shaped voice coil motor of the present invention.

[0029] Figure 4 The figure shows the magnetizing direction diagram of the T-shaped voice coil motor of the present invention.

[0030] Figure 5 Shown is an axonometric view of the three-dimensional structure of the T-shaped voice coil motor of the present invention.

[0031] Figure 6 Shown is an axonometric view of a T-shaped base voice coil motor of the present invention, in which the magnetic steel is in a prism shape.

[0032] Figure 7 Shown is a top view of the T-shaped voice coil motor of the present invention.

[0033] Figure 8 Shown is a dimensional drawing of a T-shaped voice coil motor of the present invention.

[0034] Fig. 9 Shown is a magnetic line diagram of the T-shaped voice coil motor of the present invention.

[0035] Fig.10 It shows a comparison diagram of thrust constants of the T-shaped voice coil motor of the present invention and the E-shaped voice coil motor in the prior art.

[0036] Fig.11 Shown is a schematic structural diagram of the fast reflector of the utility model.

[0037] Component number description

[0038] 1 E-shaped voice coil motor

[0039] 10 E-shaped base

[0040] 11a Left magnetic steel

[0041] 11b Right magnetic steel

[0042] 12 Mover coil

[0043] 2 T-shaped voice coil motor

[0044] 20 T-shaped base

[0045] 200 Horizontal base

[0046] 201 Vertical base

[0047] 21 Magnetic steel assembly

[0048] 210 First Magnetic Steel

[0049] 211 Back Iron

[0050] 212 Second Magnetic Steel

[0051] 22 Third magnetic steel

[0052] 23. Mover coil

[0053] 3 Fast reflector

[0054] 30 Reflector device

[0055] 300 Reflector

[0056] 301 Switching Module

[0057] 31 Base DETAILED DESCRIPTION

[0058] The following is a description of the implementation of the present invention by means of specific examples. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0059] See also Figures 3 to 11 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings attached to this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any structural decoration, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0060] like Figure 3 As shown, this embodiment provides a T-shaped voice coil motor 2, including: a T-shaped base 20, two magnetic steel assemblies 21, a third magnetic steel 22 and a mover coil 23.

[0061] The T-shaped base 20 includes a transverse base 200 and a longitudinal base 201 , and the longitudinal base 201 is vertically arranged at the middle position of the first surface of the transverse base 200 .

[0062] Specifically, in this embodiment, the vertical direction of the longitudinal base 201 is the first direction (Z direction), the length direction of the transverse base 200 (the direction in which the two magnetic steel components are arranged relative to each other) is the second direction (X direction), and the width direction of the transverse base 200 is the third direction (Y direction). The first direction (Z direction), the second direction (X direction) and the third direction (Y direction) are perpendicular to each other.

[0063] like Figure 3 As shown, the magnetic steel assembly 21 includes a first magnetic steel 210, a back iron 211 and a second magnetic steel 212 which are stacked in sequence from bottom to top, wherein the magnetizing direction of the first magnetic steel 210 is opposite to the magnetizing direction of the second magnetic steel 212, and the first magnetic steel 210 of the two magnetic steel assemblies 21 are respectively fixed to the left and right ends of the upper surface of the transverse base 200.

[0064] Furthermore, the third magnetic steel 22 is fixed on the longitudinal base 201 , and the magnetization direction of the third magnetic steel 22 is opposite to the magnetization direction of the second magnetic steel 212 .

[0065] Specifically, in this embodiment, the upper end of the third magnetic steel 22 is flush with the upper end of each second magnetic steel 212. As an example, Figure 5 As shown, the upper end of the third magnetic steel 22 is flush with the upper ends of the two second magnetic steels 212 on its left and right sides.

[0066] As an example, Figure 4 As shown, when the magnetizing direction of the first magnetic steel 210 is set to be upward along the first direction (Z direction), the magnetizing direction of the second magnetic steel 212 is set to be downward along the first direction (Z direction), and correspondingly, the magnetizing direction of the third magnetic steel 22 is set to be upward along the first direction (Z direction). In some optional embodiments, when the magnetizing direction of the first magnetic steel 210 is set to be downward along the first direction (Z direction), the magnetizing direction of the second magnetic steel 212 is set to be upward along the first direction (Z direction), and correspondingly, the magnetizing direction of the third magnetic steel 22 is set to be downward along the first direction (Z direction).

[0067] like Figure 3 As shown, the mover coil 23 is wound around the longitudinal base 201, and there are gaps between the mover coil 23 and the longitudinal base 201 and the third magnetic steel 22. It can be understood that there should also be gaps between the mover coil 23 and the two magnetic steel assemblies 21 to provide space for the movement of the mover coil 23.

[0068] Specifically, in this embodiment, Figure 7 As shown, when a gap H is provided between the movable coil 23 and the longitudinal base 201, and a gap H is also provided between the movable coil 23 and the third magnetic steel 22, when current is passed to generate electromagnetic force, the movable coil 23 can move up and down along the first direction (Z direction) through the electromagnetic force.

[0069] More specifically, the shapes of the first magnetic steel 210, the back iron 211, the second magnetic steel 212 and the third magnetic steel 22 can be set to be a cube, a prism or a prism. As an example, the two first magnetic steels 210 have the same shape and size; the two back irons 211 have the same shape and size; and the two second magnetic steels 212 have the same shape and size.

[0070] As an example, Figure 5 As shown, the first magnetic steel 210 , the back iron 211 , the second magnetic steel 212 and the third magnetic steel 22 are all in the shape of a cuboid, and the side boundaries of the first magnetic steel 210 , the back iron 211 and the second magnetic steel 212 are all aligned.

[0071] As another example, Figure 6 As shown, the shapes of the first magnetic steel 210 and the second magnetic steel 212 are both prisms, and the prisms of the first magnetic steel 210 and the second magnetic steel 212 are opposite, wherein the size of the upper bottom surface of the prism-shaped first magnetic steel 210 is smaller than the size of the lower bottom surface, and the size of the upper bottom surface of the prism-shaped second magnetic steel 212 is larger than the size of the lower bottom surface. The shapes of the third magnetic steel 22 and the back iron 211 are rectangular parallelepiped. The structure of the magnetic steel assembly 21 is set as follows: the back iron 211 is set above the first magnetic steel 210 and completely overlaps with the upper bottom surface of the first magnetic steel 210, and the second magnetic steel 212 is set above the back iron 211, and the lower bottom surface of the second magnetic steel 212 completely overlaps with the back iron 211. In actual use, the shapes of the first magnetic steel 210, the back iron 211, the second magnetic steel 212 and the third magnetic steel 22 can be set to hexahedrons of any specifications, not limited to this embodiment.

[0072] More specifically, in this embodiment, the first magnetic steel 210, the second magnetic steel 212 and the third magnetic steel 22 are all made of rare earth permanent magnets with high magnetic energy product, including but not limited to neodymium iron boron permanent magnets or samarium cobalt permanent magnets. The back iron 211 is made of high magnetic permeability material, thereby achieving the purpose of enhancing the magnetic field of the T-shaped voice coil motor. In actual use, any material that can enhance the magnetic field is suitable for the back iron of the utility model, not limited to this embodiment.

[0073] More specifically, in this embodiment, the first magnetic steel 210, the back iron 211, the second magnetic steel 212, the third magnetic steel 22 and the T-shaped base 20 are fixed by bonding, such as glue, double-sided tape, etc. In actual use, any method that can fix the first magnetic steel 210, the back iron 211, the second magnetic steel 212, the third magnetic steel 22 and the T-shaped base 20 to each other is applicable to the utility model, and is not limited to this embodiment.

[0074] More specifically, in this embodiment, if Figure 8As shown, in the first direction (Z direction), the size of the T-shaped voice coil motor 2 is H1, the size of the first magnetic steel 210 is H2, the size of the back iron 211 is H3, the size of the second magnetic steel 212 is H4, and the size of the moving coil 23 is H5. The size H3 of the back iron 211 is 1 / 3 to 2 / 3 of the size H2 of the first magnetic steel 210, the size H4 of the second magnetic steel 212 is 3 / 5 to 4 / 5 of the size H2 of the first magnetic steel 210, and the size of the third magnetic steel 22 in the first direction (Z direction) (not shown in the figure) is 3 / 5 to 4 / 5 of the size H2 of the first magnetic steel 210. As an example, the size H2 of the first magnetic steel 210 is set to 1 cm, the size H3 of the back iron 211 is set to 0.65 cm, 0.7 cm, 0.75 cm, 0.85 cm, the size H4 of the second magnetic steel 212 is set to 0.65 cm, 0.7 cm, 0.75 cm, 0.85 cm, and the size of the third magnetic steel 22 in the first direction (Z direction) is set to 0.35 cm, 0.4 cm, 0.45 cm, 0.5 cm, 0.6 cm. In actual use, the size H4 of the second magnetic steel 212, the size H3 of the back iron 211, and the size of the third magnetic steel 22 in the first direction (Z direction) can be set according to the size H2 set for the first magnetic steel 210, and will not be described in detail here.

[0075] As an example, Figure 8 As shown, in the second direction (X direction), the size of the transverse base 200 is L1, the size of the first magnetic steel 210 is L2, and the size of the moving coil is L3. Figure 7 As shown, in the third direction (Y direction), the size of the lateral base 200 is M1. The overall size of the T-shaped voice coil motor 2 is 2cm*1cm*1cm (L1*H1*M1). Figure 8 As shown, when H2:H4:H5=1-1.25:1:1, H1:H2=2-2.5:1, L1:L2=4-5:1, the output thrust of the T-shaped voice coil motor 2 is maximum, and the thrust fluctuation is small.

[0076] More specifically, in this embodiment, if Fig. 9As shown, the T-shaped voice coil motor 2 has four magnetic force line paths. The first path: flows from the first magnetic steel 210 on the left into the back iron 211 on the left, then flows from the back iron 211 on the left into the mover coil 23, flows from the mover coil 23 into the longitudinal base 201, flows from the longitudinal base 201 into the transverse base 200, and flows from the transverse base 200 into the first magnetic steel 210 on the left, forming a closed loop. The second path: flows from the second magnetic steel 212 on the left into the back iron 211 on the left, then flows from the back iron 211 on the left into the mover coil 23, flows from the mover coil 23 into the third magnetic steel 22, and flows from the third magnetic steel 22 into the second magnetic steel 212 on the left, forming a closed loop. The third path: from the first magnetic steel 210 on the right side, it flows into the back iron 211 on the right side, and then from the back iron 211 on the right side, it flows into the mover coil 23, from the mover coil 23, it flows into the longitudinal base 201, from the longitudinal base 201, it flows into the transverse base 200, and from the transverse base 200, it flows into the first magnetic steel 210 on the right side, forming a closed loop. The fourth path: from the second magnetic steel 212 on the right side, it flows into the back iron 211 on the right side, and then from the back iron 211 on the right side, it flows into the mover coil 23, from the mover coil 23, it flows into the third magnetic steel 22, and from the third magnetic steel 22, it flows into the second magnetic steel 212 on the right side, forming a closed loop.

[0077] More specifically, in this embodiment, the T-shaped voice coil motor 2 has two more back irons 211, two second magnetic steels 212 and a third magnetic steel 22 in structure than the E-shaped voice coil motor 1 in the prior art. Figure 2 Magnetic line diagram of E-shaped voice coil motor 1 in the prior art and Fig. 9 From the magnetic force line diagram of the T-shaped voice coil motor 2, it can be seen that the T-shaped voice coil motor 2 of the present invention has two more magnetic circuits than the E-shaped voice coil motor 1, and has a more compact structure, thereby making the magnetic field more compact, and thus less leakage magnetic flux.

[0078] More specifically, in combination with Figure 5 and Fig.10 As shown, when the first magnetic steel 210, the second magnetic steel 212, and the back iron 211 in the T-shaped voice coil motor 2 are all set to a rectangular parallelepiped shape, the thrust constant of the T-shaped voice coil motor 2 is about 1.2N / A. Under the same working conditions (variables such as materials, dimensions, and environments are the same), the thrust constant of the E-shaped voice coil motor 1 in the prior art is about 0.8N / A. By comparing the thrust constants, it can be concluded that the T-shaped voice coil motor 2 has a greater thrust than the E-shaped voice coil motor 1 in the prior art, and has the advantages of low power consumption and low temperature rise.

[0079] The magnetization direction of the magnetic steel of the T-shaped voice coil motor 2 of the utility model is axial magnetization, so the processing difficulty is small and the cost is low. At the same time, the T-shaped voice coil motor 2 has four magnetic force line paths, so that the magnetic circuit is more compact and the coil utilization rate is high, thereby achieving the purpose of greater thrust and less loss.

[0080] like Fig.11 As shown, the utility model also provides a fast reflector 3, which includes: a reflector device 30 and at least two T-shaped voice coil motors 2. The reflector device 30 is connected to the moving coil 23 of the T-shaped voice coil motor 2, and the T-shaped voice coil motor 2 is arranged on the periphery of the reflector device 30.

[0081] Specifically, in this embodiment, the fast reflector 3 further includes a base 31 , and the reflector device 30 and the T-shaped voice coil motor 2 are both disposed on the base 31 .

[0082] More specifically, in this embodiment, the reflector device 30 is connected to the mover coil 23 of the T-shaped voice coil motor 2, and the reflector device 30 is driven to move according to the up and down movement of the mover coil 23. Fig.11 As shown, the number of T-shaped voice coil motors 2 is set to 4, and the four T-shaped voice coil motors 2 are arranged in pairs around the reflector device 30. The reflector device 30 includes a reflector 300 and an adapter module 301. As an example, the adapter module 301 is set as a reflector bracket, and the reflector 300 is arranged above the reflector bracket, and the reflector bracket is connected to the mover coil 23 of the T-shaped voice coil motor 2. The mover coil 23 of the T-shaped voice coil motor 2 moves up and down to drive the reflector bracket to move, thereby driving the reflector 300 to move. In actual use, any device based on the mover coil 23 of the T-shaped voice coil motor 2 to drive the reflector 300 to move is suitable for the adapter module 301 of the utility model, and is not limited to this embodiment.

[0083] More specifically, in this embodiment, the T-shaped voice coil motor 2 is arranged on the periphery of the reflector device 30 by screws, and the reflector device 30 and the T-shaped voice coil motor 2 are both arranged on the base 31 by screws. In this embodiment, any device that can fix the reflector device 30, the T-shaped voice coil motor 2 and the base 31, such as bolts, screws, pins, adhesives, etc., is applicable to the present utility model, and is not limited to this embodiment.

[0084] As an implementation of the utility model, Fig.11 As shown, when a positive current is passed through the moving coil 23 of one of the T-shaped voice coil motors 2, a magnetic field from outside to inside will be generated between the magnetic steels, and an upward thrust will be generated on the moving coil 23. The reflector bracket moves along with the movement of the moving coil 23, thereby driving the reflector 300 to move upward. The magnitude of the force can be changed by changing the magnitude of the input current. When a reverse current is input to the moving coil 23, the direction of the magnetic flux lines generated is opposite, and a downward thrust is generated on the moving coil 23. Similarly, when current is passed through the four T-shaped voice coil motors 2, different combinations of changing the direction of the current will cause the reflector 300 to deflect in different directions, and changing the magnitude of the current can control the reflector 300 to deflect at different angles.

[0085] In summary, the T-shaped voice coil motor of the utility model has the advantages of small size, large thrust, small thrust fluctuation, low processing difficulty, compact magnetic circuit, low loss, high coil utilization rate and low cost. The T-shaped voice coil motor is applied to fast reflectors to obtain a larger angular range and a higher working bandwidth. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0086] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A T-shaped voice coil motor, characterized in that: include: A T-shaped base (20), the T-shaped base (20) comprising a transverse base (200) and a longitudinal base (201), the longitudinal base (201) being vertically arranged at a middle position of a first surface of the transverse base (200); Two magnetic steel assemblies (21), the magnetic steel assemblies (21) comprising a first magnetic steel (210), a back iron (211) and a second magnetic steel (212) stacked in sequence from bottom to top, the magnetization direction of the first magnetic steel (210) being opposite to the magnetization direction of the second magnetic steel (212), and the first magnetic steel (210) of the two magnetic steel assemblies (21) being respectively fixed to two ends of a first surface of the transverse base (200); a third magnetic steel (22), the third magnetic steel (22) being fixed on the longitudinal base (201), the magnetization direction of the third magnetic steel (22) being opposite to the magnetization direction of the second magnetic steel (212); A movable coil (23), wherein the movable coil (23) is wound around the longitudinal base (201), and gaps are provided between the movable coil (23), the longitudinal base and the third magnetic steel (22).

2. The T-shaped voice coil motor according to claim 1, characterized in that: The shapes of the first magnetic steel (210), the back iron (211), the second magnetic steel (212) and the third magnetic steel (22) are respectively set to be a cube, a prism or a pyramid.

3. The T-shaped voice coil motor according to claim 1 or 2, characterized in that: In the vertical direction of the longitudinal base (201), the size of the back iron (211) is 1 / 3 to 2 / 3 of the size of the first magnetic steel (210).

4. The T-shaped voice coil motor according to claim 1 or 2, characterized in that: In the vertical direction of the longitudinal base (201), the size of the second magnetic steel (212) is 3 / 5 to 4 / 5 of the size of the first magnetic steel (210).

5. The T-shaped voice coil motor according to claim 1 or 2, characterized in that: In the vertical direction of the longitudinal base (201), the size of the third magnetic steel (22) is 3 / 5 to 4 / 5 of the size of the first magnetic steel (210).

6. The T-shaped voice coil motor according to claim 1, characterized in that: The upper end of the third magnetic steel (22) is flush with the upper end of the second magnetic steel (212).

7. The T-shaped voice coil motor according to claim 1, characterized in that: The first magnetic steel (210), the back iron (211), the second magnetic steel (212), the third magnetic steel (22) and the T-shaped base (20) are all fixed by bonding.

8. A fast reflector, characterized in that: include: A reflector device (30) and at least two T-shaped voice coil motors (2) according to any one of claims 1 to 7; The reflector device (30) is connected to the moving coil (23) of the T-shaped voice coil motor (2), and the T-shaped voice coil motor (2) is arranged on the periphery of the reflector device (30).

9. The fast reflection mirror according to claim 8, characterized in that It also comprises a base (31), on which the reflector device (30) and the T-shaped voice coil motor (2) are both arranged.

10. The fast reflection mirror according to claim 8, characterized in that The number of the T-shaped voice coil motors (2) is set to four, and the four T-shaped voice coil motors (2) are arranged opposite to each other in pairs around the reflector device (30).

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