A mirror galvanometer

Abstract

The utility model relates to a swing mirror motor, include: base, stator subassembly is fixed on the first side surface of base, rotor subassembly is set up in the outside of stator subassembly, and can rotate along the circumferential direction of stator subassembly, FPCB is fixed on the second side surface of base, and is used for with stator subassembly electricity is connected, and the rotating shaft is worn in stator subassembly, and the first end of rotating shaft is connected with rotor subassembly, and the second end is close to FPCB, wherein, the region of opposite FPCB with rotating shaft is encapsulated magnetic angle encoder chip, and the second end of rotating shaft is provided with magnet. The swing mirror motor of the application is small in size, simple in assembly, low in manufacturing cost and high in assembly yield.

Description

Technical Field

[0001] This utility model relates to the field of oscillating mirror scanning, and in particular to an oscillating mirror motor. Background Technology

[0002] A oscillating mirror motor is a special type of motor that utilizes the principle of oscillation to achieve motion. It is widely used in optics, communications, medical applications, laser processing, and other fields, enabling rapid and precise motion control. In general, oscillating mirror motors have significant application value in multiple fields, including optical signal conditioning, laser beam control, optical imaging, and signal processing.

[0003] In lidar systems, mirror motors are widely used to scan the direction and position of the laser beam. By controlling the oscillation of the mirror, the mirror motor enables rapid and precise scanning of the laser beam, thereby achieving three-dimensional perception and measurement of the surrounding environment. With the continuous advancement of lidar technology, the performance requirements for it are increasing, especially in terms of size, response speed, and reliability. However, current mirror motors are still relatively large, and their output torque and rotational accuracy need improvement, which limits their application in some special working conditions and significantly impacts the overall performance of lidar systems. Therefore, there is an urgent need in this field for a smaller, higher-performance mirror motor to meet the growing market demand and technological challenges. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model proposes a mirror motor. By encapsulating a magnetic angle encoder chip on the FPCB to control the rotation of the reflector, the size of the motor can be effectively reduced, the motor structure can be simplified, the assembly difficulty and manufacturing cost of the motor can be reduced, and the assembly yield of the motor can be improved.

[0005] The mirror motor includes: a base; a stator assembly fixed to a first side surface of the base; a rotor assembly sleeved on the outside of the stator assembly and rotatable along the circumferential direction of the stator assembly; an FPCB fixed to a second side surface of the base and used for electrical connection with the stator assembly; and a rotating shaft passing through the stator assembly, the first end of the rotating shaft being connected to the rotor assembly, and the second end being close to the FPCB; wherein a magnetic angle encoder chip is encapsulated in the region of the FPCB opposite to the rotating shaft, and a magnet is provided at the second end of the rotating shaft.

[0006] As described above, the second side surface of the base of the pendulum motor includes a recess for accommodating the FPCB.

[0007] As described above, the base of the pendulum motor includes a first connecting hole and a second connecting hole. The first connecting hole is located in the recess and connects the first side surface and the second side surface of the base, and is used to accommodate the magnetic angle encoder chip. The second connecting hole is located in the recess and connects the first side surface and the second side surface of the base, and is used to accommodate the FPCB and the stator assembly for electrical connection.

[0008] As described above, in the pendulum mirror motor, the stator assembly includes a stator base and an iron core winding. The stator base is connected to the base, and the iron core winding is disposed on the stator base and electrically connected to the FPCB.

[0009] As described above, in the pendulum mirror motor, the stator base near the base includes an edge with multiple connection holes.

[0010] As described above, the stator housing of the pendulum motor includes one or more bearings for fixed connection with the rotating shaft.

[0011] As described above, in the pendulum mirror motor, the rotor assembly includes a housing and a magnetic ring. The housing has an opening that is fitted onto the stator assembly, and the magnetic ring is fixed to the inner wall of the opening.

[0012] As described above, in the pendulum mirror motor, the rotor assembly includes a reflector disposed on the housing, the reflector being parallel to the axis of the opening.

[0013] As described above, the mirror motor also includes a shaft connection hole on the housing, the axis of which coincides with the axis of the opening and is connected to the opening for fixed connection with the shaft.

[0014] As described above, the rotating mirror motor includes an adhesive layer between the rotating shaft connection hole and the rotating shaft.

[0015] This application reduces the size of the motor by using a magnetic angle encoder chip in conjunction with a magnet on the shaft to control the rotation of the reflector. It eliminates the need for a special positioning structure, simplifies assembly, reduces manufacturing costs, and improves INL characteristics and assembly yield. Attached Figure Description

[0016] The preferred embodiments of this utility model will now be described in further detail with reference to the accompanying drawings, wherein:

[0017] Figure 1 This is a schematic diagram of a swing mirror motor structure according to an embodiment of this application;

[0018] Figure 2 An exploded view of a pendulum mirror motor according to an embodiment of this application; and

[0019] Figure 3This is a schematic diagram of an FPCB structure according to an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the following detailed description, reference can be made to the accompanying drawings, which form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to implement the technical solutions of the present application. It should be understood that other embodiments may also be utilized, or structural, logical, or electrical changes may be made to the embodiments of the present application.

[0022] In the description of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Currently, the swing mirror motor controls the swing of the reflector by setting a photoelectric encoder chip on the external mirror frame, thus separating it from the flexible printed circuit board (FPCB) of the swing mirror motor. This results in complex control circuitry and increased motor size. Furthermore, a special structure needs to be machined on the mirror frame to fix the photoelectric encoder chip (i.e., circumferential error prevention of the photoelectric encoder chip) to prevent the zero-position angle of the photoelectric encoder chip from deviating. As a result, the swing mirror motor has a complex structure, is difficult to assemble, and has a low yield and reliability.

[0024] This application proposes a novel pendulum mirror motor. By replacing the photoelectric encoder chip with a magnetic angle encoder chip and integrating the magnetic angle encoder chip on the FPCB inside the pendulum motor, and placing a magnet at the tail end of the shaft near the FPCB, the mirror can be controlled. The structure is simple, and no special positioning structure is required outside the pendulum motor, which can reduce assembly difficulty, reduce the size of the motor, and improve yield and reliability.

[0025] The technical solution of this application will be further illustrated below through specific implementation methods. Those skilled in the art should understand that the following description is merely for the convenience of understanding the technical solution of this application and should not be used to limit the scope of protection of this application.

[0026] Figure 1 This is a schematic diagram of a swing mirror motor structure according to an embodiment of this application. Figure 2 This is an exploded view of a pendulum mirror motor according to an embodiment of this application.

[0027] like Figure 1 and combined Figure 2 As shown, the mirror motor (hereinafter referred to as "motor") 100 includes: a stator assembly 110, a rotor assembly 120, an FPCB 130, a base 140, and a rotating shaft 150. The stator assembly 110 is fixed to a first side surface of the base 140; the rotor assembly 120 is sleeved on the stator assembly 110 and can rotate along the circumference of the stator assembly; the FPCB 130 is fixed to a second side surface of the base 140; the rotating shaft 150 passes through the stator assembly 110, with its first end connected to the rotor assembly 120 and its second end extending towards the FPCB 130.

[0028] like Figure 2 As shown, in some embodiments, the stator assembly 110 includes a stator base 111 and a core winding 112. The core winding 112 is sleeved on the stator base 111, which is used to connect to the base 140. In some embodiments, the stator base 111 may include an edge 1111, which can be used to limit the position of the core winding 112 and can be connected to the base 140. In some embodiments, the stator base 111 includes a plurality of first connecting holes 1112, which can be disposed on the edge and connected to the base 140. In some embodiments, the stator assembly 110 may further include one or more bearings (not shown) which can be disposed in the stator base and can be used to fix and connect the rotating shaft 150, facilitating the rotation of the rotating shaft 150 within the stator assembly.

[0029] like Figure 2As shown, in some embodiments, the rotor assembly 120 may include a housing 121 and a magnetic ring 122. The magnetic ring 122 is disposed within the housing 121 and can cooperate with the iron core winding 112, causing the housing 121 to rotate. In some embodiments, the housing 121 is generally cubic, with a cylindrical hole 1211 formed on one surface and extending inwards to fit onto the stator assembly; the magnetic ring 122 is fixed to the inner wall of the cylindrical hole 1211. In some embodiments, the rotor assembly 120 may further include a reflector 123, which may be disposed on one surface of the housing 121. In some embodiments, the housing surface on which the reflector is disposed is parallel to the axis of the cylindrical hole. In some embodiments, the housing 121 may further include a shaft connection hole 1212, which may be disposed on one surface of the housing and communicates with the cylindrical hole 1211. In some embodiments, the surface on which the shaft connection hole is disposed is opposite to the surface on which the cylindrical hole is disposed. In some embodiments, the shaft connection hole 1212 is connected to the first end of the shaft, and its diameter may be slightly smaller than the diameter of the first end of the shaft, with the two connected by an interference fit. In some embodiments, an adhesive layer may also be included between the shaft connection hole 1212 and the first end of the shaft, and the two can be connected by adhesive.

[0030] Figure 3 This is a schematic diagram of an FPCB structure according to an embodiment of this application. (Reference) Figure 3 As shown, in some embodiments, the FPCB 130 may include a substrate 131 and a plurality of connecting posts 132 disposed on the substrate 131, the connecting posts 132 being used for electrical connection with the core winding of the stator assembly. In some embodiments, the FPCB 130 may further include a connection port 133 disposed on the substrate 131, which can be used for connecting the FPCB to an external power supply or external communication. In some embodiments, the FPCB may further include a plurality of second connecting holes 134 disposed on the substrate 131, which can be used for connecting the FPCB to a base. In some embodiments, the second connecting holes 134 may correspond to the positions of the first connecting holes 1112.

[0031] In some embodiments, the FPCB may further include a magnetic angle encoder chip 135, which can be packaged on a substrate 131 and used to control lens rotation. In some embodiments, the magnetic angle encoder chip is disposed in the region of the substrate 131 opposite to the rotating shaft. In some embodiments, a magnet 151 is disposed on the second end of the rotating shaft 150, which can be used to generate a magnetic field parallel to the surface of the magnetic angle encoder chip. When the rotating shaft rotates, the magnet causes a change in the magnetic field parallel to the magnetic angle encoder chip, and the magnetic angle encoder chip can respond to the changed magnetic field, thereby controlling the lens. During use, the magnetic angle encoder chip only responds to changes in the direction of the magnetic field parallel to the chip surface. The requirements for the machining error of the magnet itself and the installation distance error between the magnet and the magnetic angle encoder chip are relatively low, which reduces the assembly difficulty of the motor and the manufacturing cost of parts, and improves the yield rate of the motor.

[0032] In some embodiments, the magnetic angle encoder chip can be a high-resolution, high-precision magnetic angle encoder chip employing advanced anisotropic magnetoresistive (AMR) technology. It can provide an automatic nonlinear calibration mode for the client, with no data interaction and automatic compensation calculation. This is beneficial for compensating for various nonlinearities caused by imperfections in the magnets and deviations in component assembly, thereby significantly improving the INL (Integral Non-Linearity) characteristics of the motor. Furthermore, it supports incremental ABZ, incremental UVW, PWM absolute value, and 4-wire SPI bus outputs, facilitating user programming and customization. In some embodiments, these angle encoder chips can be packaged on a substrate using SMT, allowing the magnetic angle encoder chip to be integrated on the FPCB, forming a single unit and reducing the size of the motor.

[0033] like Figure 2As shown, in some embodiments, the first side surface of the base 140 includes a recess 141 extending from the first side surface to the second side surface of the base for accommodating the FPCB. In some embodiments, the thickness of the recess 141 is the same as or slightly larger than the thickness of the FPCB, allowing the FPCB to be completely contained within the recess and thus protecting it. In some embodiments, the base 140 may further include a first connecting hole 142 and a second connecting hole 143. The first connecting hole 142 and the second connecting hole 143 are disposed in the recess 141 and communicate with the second side surface of the base. The first connecting hole 142 corresponds to the magnet at the second end of the rotating shaft and is used to accommodate a magnetic angle encoder chip, allowing the magnetic angle encoder chip to cooperate with the magnet to control the rotation of the reflector. The second connecting hole 143 is used for electrical connection between the connecting post of the FPCB and the core winding of the stator assembly, and can be used to supply power to the stator assembly. In some embodiments, the base 140 may further include a plurality of third connecting holes 144, which can be used to connect the base to the FPCB and / or the stator assembly. In some embodiments, the positions of the plurality of third connecting holes 144 correspond to the positions of the second connecting hole 134 and the first connecting hole 1112, thereby allowing the FPCB, base, and stator assembly to be connected using the same connector (connecting bolt 101). For example, the first connecting hole 1112 can be a threaded hole, and the connecting bolt passes through the second connecting hole 134 and the third connecting hole 144 and can be tightened into the first connecting hole 1112, thereby assembling the FPCB, base, and stator assembly. This helps reduce the number of openings on the base, increases the strength of the base, and simplifies the assembly process.

[0034] The mirror-swinging motor of this application uses a magnetic angle encoder chip in conjunction with a magnet located at the tail end of the rotating shaft to control the rotation of the mirror. Since the magnetic angle encoder chip is cheaper than traditional photoelectric encoder chips (approximately 20% lower cost per unit), and eliminates the need for special positioning structures on the frame, it reduces component manufacturing costs by approximately 3%. This results in a lower overall cost for the mirror-swinging motor. Furthermore, integrating the magnetic angle encoder chip inside the motor reduces its size, assembly difficulty, and component manufacturing costs, ultimately improving assembly yield.

[0035] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims

1. A pendulum mirror motor, characterized in that, include: Base; A stator assembly, which is fixed to a first side surface of the base; A rotor assembly is fitted around the stator assembly and can rotate along the circumference of the stator assembly. The FPCB is fixed to the second side surface of the base and is used for electrical connection with the stator assembly; as well as A rotating shaft passes through the stator assembly, with its first end connected to the rotor assembly and its second end close to the FPCB; The FPCB is encapsulated in the region opposite to the rotating shaft, and a magnet is provided at the second end of the rotating shaft.

2. The pendulum mirror motor according to claim 1, characterized in that, The second side surface of the base includes a recess for accommodating the FPCB.

3. The pendulum mirror motor according to claim 2, characterized in that, The base includes a first connecting hole and a second connecting hole. The first connecting hole is located in the recess and connects the first side surface and the second side surface of the base, and is used to accommodate the magnetic angle encoder chip. The second connecting hole is located in the recess and connects the first side surface and the second side surface of the base, and is used to accommodate the FPCB and the stator assembly for electrical connection.

4. The pendulum mirror motor according to claim 1, characterized in that, The stator assembly includes a stator base and an iron core winding. The stator base is connected to the base, and the iron core winding is disposed on the stator base and electrically connected to the FPCB.

5. The pendulum mirror motor according to claim 4, characterized in that, The stator base includes an edge near the base, which has multiple connection holes.

6. The pendulum mirror motor according to claim 4, characterized in that, The stator housing includes one or more bearings for fixed connection with the rotating shaft.

7. The pendulum mirror motor according to claim 1, characterized in that, The rotor assembly includes a housing and a magnetic ring. The housing has an opening that is fitted onto the stator assembly, and the magnetic ring is fixed to the inner wall of the opening.

8. The pendulum mirror motor according to claim 7, characterized in that, The rotor assembly includes a reflector disposed on the housing, the reflector being parallel to the axis of the opening.

9. The pendulum mirror motor according to claim 7, characterized in that, The outer casing also includes a pivot connection hole, the axis of which coincides with the axis of the opening and is connected to the opening for fixed connection with the pivot.

10. The pendulum mirror motor according to claim 9, characterized in that, An adhesive layer is included between the shaft connection hole and the shaft.

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