CN112737263A

CN112737263A - Miniature vibrating device

Info

Publication number: CN112737263A
Application number: CN202011518290.0A
Authority: CN
Inventors: 王海童; 赵磊
Original assignee: Bluecom Co ltd
Current assignee: Bluecom Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-04-30

Abstract

The invention relates to a miniature vibration device, which comprises an upper shell, a lower shell, a printed circuit board, a coil, a mass block and an elastic sheet, wherein the lower shell comprises a plane and a positioning boss, and the central part of the plane protrudes to the upper part; the printed circuit board penetrates through the positioning boss and is combined with the plane of the lower shell, the coil is arranged on the upper portion of the printed circuit board, the center of the coil penetrates through the positioning boss, the mass block is arranged on the upper portion of the coil, magnets are arranged in the mass block, the number of the elastic pieces is two, the two elastic pieces are symmetrically arranged on two sides of the mass block, the upper ends of the elastic pieces are connected with the mass block, and the lower ends of the elastic pieces are arranged on the lower shell; the upper shell and the lower shell are matched with each other to form a closed cavity, and the mass block is suspended in the closed cavity through the elastic sheet. The invention has novel structure, convenient installation, small volume and good vibration sense experience.

Description

Miniature vibrating device

Technical Field

The invention belongs to the technical field of electromagnetism and vibration mechanics, relates to a miniaturized linear motor, and particularly relates to a miniature vibration device.

Background

In the linear motor in the current market, the X-direction linear motor is generally applied to the current complete machine product because the vibration body feeling is good and the complete machine space utilization rate is relatively high. However, in order to achieve good vibration feeling experience, most of the X-direction linear motors in the current market are generally large in design size, occupy large use space of the whole machine, and reduce the space utilization rate of the whole machine, and especially for intelligent wearable electronic whole machine products, the requirement for miniaturization design of the linear motors is higher; the X-direction linear motor is long in stroke, displacement is limited by sticking foam or magnetic fluid to reduce braking time, and vibration is reduced; meanwhile, in the vibration process, due to the large assembly difficulty, low assembly precision and poor centering effect, polarization is easy to occur in the vibration process, so that the risk of poor products is caused; in addition, in the welding process of the elastic sheet and the shell as well as the elastic sheet and the mass block, gaps are formed in the welding of the elastic sheet, the shell and the mass block due to the large positioning difficulty of the elastic sheet, and the risk of noise and falling of the reliable elastic sheet is caused in the vibration process of a product.

No patent documents relevant to the present application were found by search.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides the miniature vibration device which is novel in structure, convenient and fast to install, small in size and good in vibration sense experience.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

a miniature vibration device comprises an upper shell, a lower shell, a printed circuit board, a coil, a mass block and an elastic sheet, wherein the lower shell comprises a plane and a positioning boss with the central part of the plane protruding to the upper part; the printed circuit board penetrates through the positioning boss and is combined with the plane of the lower shell, the coil is arranged on the upper portion of the printed circuit board, the center of the coil penetrates through the positioning boss, the mass block is arranged on the upper portion of the coil, magnets are arranged in the mass block, the number of the elastic pieces is two, the two elastic pieces are symmetrically arranged on two sides of the mass block, the upper ends of the elastic pieces are connected with the mass block, and the lower ends of the elastic pieces are arranged on the lower shell; the upper shell and the lower shell are matched with each other to form a closed cavity, and the mass block is suspended in the closed cavity through the elastic sheet.

And both sides of the upper surface of the mass block are also provided with positioning grooves matched with the two ends of the elastic sheet.

And the connecting surface of the elastic sheet and the mass block and the connecting surface of the elastic sheet and the lower shell are both provided with a support, and the supports are both combined with the elastic sheet.

Moreover, the width of the central part of the elastic sheet is narrower than the width of the two sides of the tail.

And, the quality piece upper portion still is provided with the flat board, and the flat board is mainly located magnet upper portion.

And the inner side of the upper shell is provided with a damping device in a left-right limiting manner, and the damping device is made of foam.

Moreover, the elastic sheet is of a C-shaped structure which is integrally manufactured.

The invention has the advantages and positive effects that:

the upper shell and the lower shell are made of magnetic materials, the positioning boss is arranged in the middle of the lower shell, the centering effect on a printed circuit board and a coil can be realized, the polarization problem caused by poor centering effect is solved, meanwhile, the utilization rate of a magnetic field is increased (which is equivalent to the fact that an iron core is additionally arranged in the coil), the driving force is improved, the coil positioning boss structure generates eddy current, the energy consumption is increased at the moment of power failure of the coil, and the braking time of a performance motor is reduced; ensure that the magnetic leakage volume reduces, promote the magnetic circuit utilization ratio, promote product property ability.

The elastic sheet adopts a C-shaped structure and a Z-direction assembly design, so that the integral height of a product is reduced while a sufficient vibration space is ensured, the space utilization rate of the whole machine is improved, and the assembly process flow is simplified;

the positioning groove for the elastic sheet is arranged at the position of the mass block, so that the mass block and the elastic sheet are automatically positioned, and meanwhile, the welding process flow is improved, so that the product is more firmly welded.

Drawings

FIG. 1 is an exploded view of the overall structure of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is an internal structural view of the present invention;

FIG. 4 is a schematic view of the construction of the lower case of the present invention;

FIG. 5 is a structural view of the elastic sheet of the present invention;

fig. 6 is a view showing the construction of a stator according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments, which are illustrative only and not limiting, and the scope of the present invention is not limited thereby.

A miniature vibration device comprises an upper shell 1, a lower shell 10, a Flexible Printed Circuit Board (FPCB)9, a Coil (CO) 8, a mass block 2 and an elastic sheet 6, wherein the lower shell comprises a plane and a positioning boss 10-1 with the central part of the plane protruding to the upper part; the flexible printed circuit board penetrates through the positioning boss and is combined with the plane of the lower shell, the coil is arranged on the upper portion of the flexible printed circuit board, the center of the coil penetrates through the positioning boss and is vertically combined with the plane of the lower shell, the mass block is arranged on the upper portion of the coil, and a magnet combining portion is arranged in the mass block and used for fixing the magnet 4, so that the mass block has weight, and vibration is amplified by using the weight; the number of the elastic pieces is two, the elastic pieces are all integrally made C-shaped structures, the upper ends of the elastic pieces are connected with the mass block, and the lower ends of the elastic pieces are arranged on the lower shell;

the inner part of the upper shell is hollow and forms the outer contour of the vibrating device, the upper shell and the lower shell are matched with each other to form a closed cavity, the mass block is suspended in the closed cavity through the elastic sheet, the flexible printed circuit board receives a power supply from the outside and supplies the power supply to the coil, and the coil generates an electric field after receiving the power supply supplied by the flexible printed circuit board, so that the generated electric field and the magnetic field of the magnet are acted, and stable horizontal vibration is generated through the matching of the elastic sheet;

further, the width of the central part of the elastic sheet is narrower than the width of the two sides of the tail, so that the vibration frequency is reduced, and the vibration sensation is improved, wherein the improvement of the vibration sensation means that the higher the frequency is, the more the vibration frequency is, and the lower the frequency is, the less the vibration frequency is, so that the vibration frequency per minute is reduced; since the number of vibrations per minute is reduced, it becomes easier for a user (operator) to sense the vibrations; therefore, the elastic sheet can disperse the stress concentration phenomenon, thereby protecting the elastic sheet from being damaged;

furthermore, positioning grooves matched with the two ends of the elastic sheet are formed in the two sides of the mass block, so that the mass block and the elastic sheet can be positioned autonomously, the welding process is improved, and the product is welded more firmly;

furthermore, in order to prevent the deformation and damage of the elastic sheet, supporting objects 5 are arranged at the connecting surface of the elastic sheet and the mass block and the connecting surface of the elastic sheet and the lower shell, and the supporting objects are combined with the elastic sheet and used for supporting the connection of the elastic sheet and the mass block and the connection of the elastic sheet and the lower shell to fix the elastic sheet and the mass block;

furthermore, a flat Plate (Plate)3 is arranged on the upper part of the mass block, is mainly positioned on the upper part of the magnet, blocks a magnetic field generated by the magnet to form a closed loop of the magnetic field, and has a magnetic field shielding function;

furthermore, a damping device (Damper)7 is arranged at the left and right limiting positions at the inner side of the upper shell, the damping device adopts foam to play a damping role, and the impact of the mass block on the elastic sheet can be absorbed by the damping device and simultaneously the noise is removed;

in the specific implementation of the invention, the upper and lower shells are made of magnetic conductive materials, and the middle part of the lower shell is provided with the positioning boss, so that the centering effect on the printed circuit board and the coil can be realized, the polarization problem caused by poor centering effect can be solved, meanwhile, the utilization rate of a magnetic field is increased (which is equivalent to the fact that an iron core is added in the coil), the driving force is improved, the positioning boss structure generates eddy current, the energy consumption is increased at the moment of power failure of the coil, and the braking time of a performance motor is reduced; ensure that the magnetic leakage volume reduces, promote the magnetic circuit utilization ratio, promote product property ability.

In the specific implementation of the invention, the elastic sheet adopts a C-shaped structure and a Z-direction assembly design, so that the integral height of a product is reduced, the space utilization rate of the whole machine is improved and the assembly process flow is simplified while enough vibration space is ensured.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.

Claims

1. A miniature vibration device, characterized in that: the lower shell comprises a plane and a positioning boss, wherein the center part of the plane protrudes to the upper part; the printed circuit board penetrates through the positioning boss and is combined with the plane of the lower shell, the coil is arranged on the upper portion of the printed circuit board, the center of the coil penetrates through the positioning boss, the mass block is arranged on the upper portion of the coil, magnets are arranged in the mass block, the number of the elastic pieces is two, the two elastic pieces are symmetrically arranged on two sides of the mass block, the upper ends of the elastic pieces are connected with the mass block, and the lower ends of the elastic pieces are arranged on the lower shell; the upper shell and the lower shell are matched with each other to form a closed cavity, and the mass block is suspended in the closed cavity through the elastic sheet.

2. The micro-vibration device of claim 1, wherein: and positioning grooves matched with the two ends of the elastic sheet are also formed in the two sides of the upper surface of the mass block.

3. The micro-vibration device of claim 1, wherein: supporting objects are arranged at the connecting surface of the elastic sheet and the mass block and the connecting surface of the elastic sheet and the lower shell, and the supporting objects are combined with the elastic sheet.

4. The micro-vibration device of claim 1, wherein: the width of the central part of the elastic sheet is narrower than the width of the two sides of the tail.

5. The micro-vibration device of claim 1, wherein: the upper part of the mass block is also provided with a flat plate, and the flat plate is mainly positioned on the upper part of the magnet.

6. The micro-vibration device of claim 1, wherein: the inner side of the upper shell is provided with a damping device in a left-right limiting mode, and the damping device is made of foam.

7. The micro-vibration device of claim 1, wherein: the elastic sheet is of an integrally made C-shaped structure.