Low-noise large-amplitude vibration table with simple structure

Abstract

The application relates to a low-noise large-amplitude vibration table with simple structure, which solves the problems of complex structure, large noise, small amplitude and small load of the existing vibration table. The vibration table comprises a base, a circuit board arranged on the base, a product mounting seat movably arranged on the base and used for mounting a product to be tested, and a voice coil motor driving mechanism for driving the mounting seat to vibrate. The voice coil motor driving mechanism comprises a coil and a magnet. The coil is electrically connected with the circuit board. The included angle between the winding shaft of the coil and the vertical direction of the supporting shaft is less than 10 degrees. When the coil is electrified, the voice coil motor driving mechanism drives the coil mounting seat to rotate along the supporting shaft. When the coil is de-energized, the reset elastic member drives the coil mounting seat to reset. The product on the product mounting seat is driven to vibrate by at least one movable structure. Therefore, the overall structure is simple. The coil mounting seat rotates along the supporting shaft to drive the product on the product mounting seat to vibrate. The amplitude is large, the noise is small, and the load can be relatively heavy.

Description

Technical Field

[0001] This invention relates to a low-noise, large-amplitude vibration table with a simple structure. Background Technology

[0002] In recent years, cameras and gimbals with image stabilization have become increasingly popular, and their applications are constantly expanding, including smartphones, smart glasses, action cameras, law enforcement recorders, and dashcams. During the production process, these target products (e.g., cameras and gimbals) require the use of a vibration table for image stabilization calibration and quality testing. Furthermore, when promoting these target products, it is necessary to place them on a vibration table, which drives the product to vibrate, demonstrating the image stabilization function and stable shooting results.

[0003] Traditional vibration tables can be divided into two categories. The first type (referencing patents: CN201348717Y, CN201438257U, CN204389872U, CN106303506B, CN107116020B) connects the actuator and the movable structure via ball bearings, belts, or gears, causing the target product on the movable structure to vibrate. This type offers greater design flexibility and lower design complexity, but requires a larger number of components. Because the first type of vibration table connects the actuator and the movable structure via ball bearings, belts, or gears, these components generate additional noise and energy loss during operation, affecting the accuracy of anti-vibration testing and calibration, and causing vibration interference to nearby equipment. Furthermore, this type of vibration table requires more components, resulting in higher prices and maintenance costs.

[0004] The second type (CN203950213U) employs a direct-drive (Direct Drive) vibration table structure. This structure requires fewer components and effectively avoids unnecessary high-frequency vibrations caused by additional components connecting the movable structure and the voice coil motor (e.g., balls, bearings, belts, or gears). This improves the accuracy of anti-vibration testing and calibration, and reduces vibration interference to nearby equipment. Because the winding axis and rotation axis of the second type of vibration table are not parallel, the distance between the coil and the magnet changes during movement. This results in an increased distance between the coil and the magnet, lower magnetic thrust, and lower maximum vibration amplitude, increasing the table's power consumption and limiting the maximum load and maximum vibration amplitude. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of existing vibration tables, such as complex structure, high noise, small amplitude, and low load capacity.

[0006] The technical solution adopted to solve the technical problem proposed in this invention is as follows: The low-noise, large-amplitude vibration table of this invention has a simple structure and includes a base, a circuit board on the base, a product mounting seat movably mounted on the base for mounting the product to be tested, and a voice coil motor driving mechanism for driving the vibration of the mounting seat. The voice coil motor driving mechanism includes a coil and a magnet. The coil is electrically connected to the circuit board. The base is provided with a support shaft and a coil mounting seat rotatably connected to the support shaft for mounting the coil. The coil mounting seat is provided with a coil mounting seat bushing that cooperates with the support shaft. The coil mounting seat and the coil form a movable structure. The product mounting seat is mounted on the coil mounting seat. The angle between the winding axis of the coil and the vertical direction of the support shaft is less than 10 degrees. The magnet is fixedly mounted on the base corresponding to the coil. When the coil is energized, the voice coil motor driving mechanism drives the coil mounting seat to rotate along the support shaft. The base is also provided with a reset elastic element for driving the coil mounting seat to reset when the coil is de-energized. At least one movable structure and a reset elastic element are provided. At least one magnet is provided for each coil of the movable structure.

[0007] The technical solutions that further define the present invention include:

[0008] Each movable structure is equipped with a sensor for detecting the vibration of the movable structure.

[0009] At least two movable structures are arranged parallel to each other, with a first sensor provided on the middle of the corresponding coil on at least one upper coil mounting base, and a first sensor provided on the middle of the corresponding coil on at least one lower coil mounting base.

[0010] At least two sets of movable structures are arranged parallel to each other. Each set of movable structures includes two symmetrically arranged movable structures. An extension arm is provided on the same side of the middle part of each set of movable structures. A second sensor is provided on the base corresponding to both sides of the extension arm. The reset elastic element includes springs provided on both sides of each extension arm, which connect the side of the extension arm to the base. The springs are arranged perpendicular to the extension arm.

[0011] The movable structure is provided in at least two parts, wherein the two movable structures rotate in opposite directions around the support axis when vibrating.

[0012] The at least one coil is connected to the circuit board via at least one reset elastic element.

[0013] The distance between the center of gravity of each movable structure and the support axis is less than 20% of the minimum dimensions of the vibration table (length, width, height).

[0014] The coil mounting base and the support shaft are rotatably connected by a bearing.

[0015] The vibration table also includes a display mounted on a base, and the display is connected to a circuit board.

[0016] The product mounting base is a round shaft located on the coil mounting base bushing, and the round shaft has mounting holes.

[0017] The beneficial effects of the present invention through the above technical solution are as follows: The base of the low-noise, large-amplitude vibration table of the present invention has a support shaft and a coil mounting seat for mounting coils, which is rotatably connected to the support shaft. The coil mounting seat and the coil form a movable structure. The product mounting seat is mounted on the coil mounting seat. The angle between the winding axis of the coil and the vertical direction of the support shaft is less than 10 degrees. At least one movable structure and a reset elastic element are provided. At least one magnet is provided for the coil corresponding to each movable structure. The magnet is fixedly mounted on the base corresponding to the coil. When the coil is energized, the voice coil motor drive mechanism drives the coil mounting seat to rotate along the support shaft. When the coil is de-energized, the reset elastic element drives the coil mounting seat to reset. The product on the product mounting seat is driven to vibrate through at least one movable structure. Thus, the overall structure is simple. The rotation of the coil mounting seat along the support shaft drives the product on the product mounting seat to vibrate. The amplitude is large, the noise is low, and it can bear a relatively heavy load. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a low-noise, large-amplitude vibration table with a simple structure according to the present invention.

[0019] Figure 2 This is a three-dimensional structural diagram of the internal structure of the outer shell of a simple, low-noise, large-amplitude vibration table according to an embodiment of the present invention.

[0020] Figure 3 This is a cross-sectional structural diagram of a simple, low-noise, large-amplitude vibration table according to an embodiment of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the internal structure of the outer shell of a second embodiment of the low-noise, large-amplitude vibration table of the present invention.

[0022] Figure 5 This is a cross-sectional structural diagram of a second embodiment of the present invention, which is a simple, low-noise, large-amplitude vibration table.

[0023] Figure 6 This is an exploded structural diagram of a second embodiment of the present invention, which is a simple, low-noise, large-amplitude vibration table.

[0024] Figure 7 This is a three-dimensional structural diagram of the internal structure of the outer shell of a third embodiment of a low-noise, large-amplitude vibration table of the present invention, which has a simple structure.

[0025] Figure 8This is a cross-sectional structural diagram of a third embodiment of the present invention, which is a simple low-noise, large-amplitude vibration table.

[0026] Figure 9 This is an exploded structural diagram of a third embodiment of the present invention, which is a simple, low-noise, large-amplitude vibration table. Detailed Implementation

[0027] The structure of the present invention will be further described below with reference to the accompanying drawings.

[0028] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Reference Figures 1 to 9 A simple low-noise, high-amplitude vibration table includes a base 10, a circuit board 20 mounted on the base, a product mounting seat 30 movably mounted on the base for mounting the product to be tested, and a voice coil motor drive mechanism 40 for driving the vibration of the mounting seat. The base has a housing 13. The voice coil motor drive mechanism includes a coil 41 and a magnet 42. The coil is electrically connected to the circuit board. The base 10 has a support shaft 11 and a coil mounting seat 12 rotatably connected to the support shaft for mounting the coil. The coil mounting seat 12 has a coil mounting seat bushing 121 that cooperates with the support shaft. The coil mounting seat and the coil form a movable structure 50. The product mounting seat is mounted on the coil mounting seat. The angle between the winding axis of the coil and the vertical direction of the support shaft is less than 10 degrees. The magnet is fixedly mounted on the base corresponding to the coil. When the coil is energized, the voice coil motor drive mechanism drives the coil mounting seat to rotate along the support shaft. The base also has a reset elastic element 60 for driving the coil mounting seat to reset when the coil is de-energized. There is at least one movable structure and a reset elastic element. There is at least one magnet corresponding to the coil of each movable structure. When the coil is energized, the voice coil motor drive mechanism drives the coil mounting base to rotate along the support shaft, causing the product on the mounting base to vibrate. When the coil is de-energized, the reset elastic element drives the coil mounting base to reset. The product on the mounting base is driven to vibrate through at least one movable structure. The overall structure is simple. The coil mounting base rotates along the support shaft to drive the product on the mounting base to vibrate. The amplitude is large, the noise is low, and it can also bear heavy loads.

[0030] The circuit board in this embodiment includes a power supply circuit (which may include a voltage regulator) and a drive circuit (which may include a microcontroller and an H-bridge), which can provide different control currents or voltages to drive the coil and the movable structure to vibrate with different waveforms.

[0031] In this embodiment, the distance between the center of gravity of each movable structure and the support axis is less than 20% of the minimum dimensions of the vibration table (length, width, height). During movement, the inertia force generated by the movable structure is small, resulting in less vibration interference to surrounding equipment.

[0032] In this embodiment, the coil mounting base and the support shaft are rotatably connected by a bearing 80. This ensures a stable and smooth rotatable connection between the coil mounting base and the support shaft, reducing friction.

[0033] In this embodiment, the vibration table also includes a display 90 mounted on a base, which is connected to a circuit board. The display can show the status of the vibration table, such as amplitude, waveform, and frequency.

[0034] In this embodiment, the product mounting base 30 is a round shaft located on the coil mounting base sleeve, and the round shaft has a mounting hole 31. The product to be tested can be mounted on the mounting hole.

[0035] In this embodiment, a sensor 70 for detecting the vibration of the movable structure is provided for each movable structure. The sensor can be installed on the movable structure or on the base. The sensor can be a non-contact optical distance sensor, which can sense the displacement change of the movable structure relative to the stationary structure. By sensing the displacement, the vibration of the movable structure relative to the stationary structure can be calculated. Other types of sensors can also be used.

[0036] In this first embodiment, the movable structure is a movable structure 51, the reset elastic element is a flexible circuit board 61, and the coil is connected to the circuit board through the flexible circuit board. In a specific implementation, the reset elastic element can also be an electrical wire. In a specific implementation, at least one coil is connected to the circuit board through at least one reset elastic element.

[0037] In this second embodiment, there are two movable structures, namely movable structure 52 and movable structure 53, which are arranged parallel to each other vertically. The magnet corresponding to the coil of each movable structure is composed of two opposing magnet units. The magnet 421 corresponding to movable structure 52 is mounted on the magnet mounting plate 14 above the corresponding coil, and the magnet mounting plate is fixedly mounted on the base. The magnet 422 corresponding to movable structure 53 is mounted on the base below the corresponding coil. A first sensor 71 is provided on the coil mounting base of movable structure 52 corresponding to the middle of the corresponding coil, and a first sensor 72 is provided on the coil mounting base of movable structure 53 corresponding to the middle of the corresponding coil. By changing the direction and magnitude of the current in the coils of movable structure 52 and movable structure 53, the torque applied to movable structure 52 and movable structure 53 can be changed respectively, driving movable structure 52 and movable structure 53 to rotate around the axis of the support shaft. Movable structures 52 and 53 can also move in opposite directions, which can cancel each other out the inertial torque caused by the movement of the movable structures, reducing vibration interference to surrounding equipment. First sensors 71 and 72 can respectively sense the vibration of movable structures 52 and 53 relative to their respective magnets. The drive circuit on the circuit board can achieve closed-loop control of movable structures 52 and 53 by reading the signals from first sensors 71 and 72, as well as the current in the coils of movable structures 52 and 53, thereby improving vibration control accuracy and reducing external force interference. In specific implementations, at least two movable structures can be set as needed, with the rotation directions around the support shaft being opposite during vibration. In specific implementations, at least two movable structures can be set parallel vertically, with a first sensor located at the center of the corresponding coil on at least one upper coil mounting base, and a first sensor located at the center of the corresponding coil on at least one lower coil mounting base. The reset elastic element is a flexible circuit board 62, and the coil is connected to the circuit board through the flexible circuit board. In specific implementations, the reset elastic element can also be an electrical wire. In practice, at least one coil is connected to the circuit board via at least one reset elastic element.

[0038] In this third embodiment, two sets of movable structures are provided, arranged vertically and parallel to each other. The upper set of movable structures includes symmetrically arranged movable structures 54 and 55, while the lower set includes symmetrically arranged movable structures 56 and 57. The magnet corresponding to the coil of each movable structure consists of two opposing magnet units. The magnets 423 and 424 corresponding to movable structures 54 and 55 are respectively mounted on the magnet mounting plate 14 above the corresponding coil, and the magnet mounting plate is fixedly mounted on the base. The magnets 425 and 426 corresponding to movable structures 56 and 57 are respectively mounted on the base below the corresponding coil. An extension arm 541 is provided in the middle of the upper set of movable structures, and an extension arm 561 is provided in the middle of the lower set of movable structures. Second sensors 73 and 74 are respectively provided on both sides of the base corresponding to the two extension arms. The second sensor 73 and the second sensor 74 can respectively sense the displacement changes of the two sets of movable structures relative to the stationary base, thereby calculating the vibration of the movable structure relative to the stationary structure and realizing closed-loop control. The reset elastic element includes springs located on both sides of each extension arm, connecting the side of the extension arm to the base, and the springs are perpendicular to the extension arm. In specific implementation, at least two sets of movable structures can be arranged vertically in parallel. Each set of movable structures includes two symmetrically arranged movable structures. An extension arm is provided on the same side of the middle of each set of movable structures, and a second sensor is provided on both sides of the base corresponding to the extension arm. The reset elastic element includes springs 63 located on both sides of each extension arm, connecting the side of the extension arm to the base, and the springs are perpendicular to the extension arm. Two springs 631 are provided on both sides of the extension arm 541. When the power is off, the two springs 631 pull the movable structure 54 and movable structure 55 to reset. Two springs 632 are provided on both sides of the extension arm 561. When the power is off, the two springs 632 pull the movable structure 56 and movable structure 57 to reset. The reset elastic element also includes a flexible circuit board 64, through which the coil is connected to the circuit board. In a specific implementation, the reset elastic element can also be a wire. In a specific implementation, at least one coil is connected to the circuit board through at least one reset elastic element.

[0039] Although specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of the present invention. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of the present invention.

Claims

1. A simple, low-noise, large-amplitude vibration table, comprising a base, a circuit board mounted on the base, a product mounting seat movably mounted on the base for mounting the product to be tested, and a voice coil motor drive mechanism for driving the mounting seat to vibrate, wherein the voice coil motor drive mechanism comprises a coil and a magnet, the coil being electrically connected to the circuit board, characterized in that: The base is provided with a support shaft and a coil mounting seat rotatably connected to the support shaft for mounting the coil. The coil mounting seat is provided with a coil mounting seat bushing that cooperates with the support shaft. The coil mounting seat and the coil form a movable structure. The product mounting seat is mounted on the coil mounting seat. The angle between the winding axis of the coil and the vertical direction of the support shaft is less than 10 degrees. The magnet is fixedly mounted on the base corresponding to the coil. When the coil is energized, the voice coil motor drive mechanism drives the coil mounting seat to rotate along the support shaft. The base is also provided with a reset elastic element for driving the coil mounting seat to reset when the coil is de-energized. There is at least one movable structure and a reset elastic element. There is at least one magnet for each coil of the movable structure. There is a sensor for detecting the vibration of the movable structure for each movable structure. There are at least two movable structures. At least two movable structures are arranged vertically in parallel. When the two vertically parallel movable structures vibrate, their rotation directions around the support shaft are opposite, which can cancel out the inertial torque caused by the movement of the movable structure and reduce vibration interference to surrounding equipment.

2. The low-noise, large-amplitude vibration table with a simple structure as described in claim 1, characterized in that: At least one upper coil mounting base has a first sensor for detecting the vibration of the corresponding movable structure located at the center of the corresponding coil. At least one lower coil mounting base has a first sensor for detecting the vibration of the corresponding movable structure located at the center of the corresponding coil.

3. The low-noise, large-amplitude vibration table with a simple structure as described in claim 1, characterized in that: At least two sets of movable structures are arranged parallel to each other. Each set of movable structures includes two symmetrically arranged movable structures. An extension arm is provided on the same side of the middle part of each set of movable structures. A second sensor for detecting the vibration of the corresponding movable structure is provided on both sides of the base corresponding to the extension arm. The reset elastic element includes springs provided on both sides of each extension arm, which connect the side of the extension arm to the base. The springs are arranged perpendicular to the extension arm.

4. The low-noise, large-amplitude vibration table with a simple structure as described in claim 1, characterized in that: The at least one coil is connected to the circuit board via at least one reset elastic element.

5. The low-noise, large-amplitude vibration table with a simple structure as described in claim 1, characterized in that: The distance between the center of gravity of each movable structure and the support axis is less than 20% of the minimum dimensions of the vibration table (length, width, height).

6. The low-noise, large-amplitude vibration table with a simple structure as described in claim 1, characterized in that: The coil mounting base and the support shaft are rotatably connected by a bearing.

7. The low-noise, large-amplitude vibration table with a simple structure as described in claim 1, characterized in that: The vibration table also includes a display mounted on a base, and the display is connected to a circuit board.

8. The low-noise, large-amplitude vibration table with a simple structure as described in claim 1, characterized in that: The product mounting base is a round shaft located on the coil mounting base bushing, and the round shaft has mounting holes.

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