WO2022134206A1

WO2022134206A1 - Linear motor

Info

Publication number: WO2022134206A1
Application number: PCT/CN2021/070098
Authority: WO
Inventors: 邵焱; 周晓荣; 凌芳华
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-12-22
Filing date: 2021-01-04
Publication date: 2022-06-30
Also published as: CN214337763U

Abstract

Provided by the present utility model is a linear motor, which comprises a cover plate, a stator assembly and a vibrator assembly fixed on the cover plate, and a housing the inner part of which covers the stator assembly and the vibrator assembly. The stator assembly comprises an FPC board fixed on the cover plate, and a coil bonded on the FPC board. The FPC board is provided with a glue injection hole, and the coil is bonded to the FPC board and the cover plate by means of the glue injection hole, so that the coil, the FPC board and the cover plate may be fixed at the same time, which helps to enhance the bonding strength of the coil, the FPC board and the cover plate.

Description

a linear motor

technical field

The utility model relates to the technical field of double resonance, in particular to a linear motor.

Background technique

With the rapid development of electronic products, especially in mobile terminal devices such as mobile phones and tablet computers, these electronic devices basically use vibration generating devices to prevent noise from electronic devices from interfering with others. The traditional vibration generating device adopts the rotor motor based on eccentric rotation, which realizes the mechanical vibration through the rotation of the eccentric vibrator. Since the eccentric vibrator rotates, the commutator and the brush will produce mechanical friction and electric sparks, etc., which will affect the mechanical vibration. The rotational speed of the eccentric vibrator further affects the vibration effect of the device. Therefore, the current vibration generating devices mostly use linear motors with better performance.

Linear motors, also known as linear motors, linear motors, push rod motors, etc., the most commonly used types of linear motors are flat, U-slot and tubular, which is a technology that converts electrical energy into linear motion mechanical energy. The repulsive force of the magnet makes the moving element levitate, and at the same time, the moving element is directly driven by the magnetic force, without the need for transmission through a transmission mechanism such as a gear set like a rotary motor. Therefore, the linear motor can make the moving element driven by it. The reciprocating motion of high acceleration and deceleration, through this characteristic, linear motors can be used in different manufacturing and processing technical fields, and be used as a driving power source or as a technical content to provide positioning.

At present, with the rapid development and fierce competition of industries such as semiconductors, electronics, optoelectronics, medical equipment and automation control, the requirements for the linear motion performance of motors in various fields are also increasing day by day. Motors are expected to have high speed, low noise and high positioning accuracy. Therefore, linear motors have been used to replace mechanical movement methods such as traditional servo motors in many applications. Flexible circuit board is Flexible Printed Circuit, referred to as FPC board, which is a kind of printed circuit board with high reliability and excellent flexibility made of polyimide or polyester film. With the characteristics of high linear density, light weight, thin thickness and good bendability, the FPC board, as one of the important components of the linear motor, has an important influence on the performance of the linear motor. The coil of the prior art is only glued with the FPC board, the glue injection area is small, and the amount of glue is insufficient. In experiments such as mechanical drop, the voice coil FPC board is easily separated, or the FPC board and the cover plate are separated.

Therefore, it is necessary to provide a linear motor that enhances the bonding strength between the FPC board, the coil, and the cover plate.

technical problem

The purpose of the present utility model is to provide a linear motor, which is intended to enhance the bonding strength among the FPC board, the coil and the cover plate.

technical solutions

The technical solution of the present invention is as follows: a linear motor, which includes a cover plate, a stator assembly fixed on the cover plate, a vibrator assembly, and a casing that covers the stator assembly and the vibrator assembly inside it, the stator assembly The assembly includes an FPC board fixed on the cover plate, and a coil glued to the FPC board, the FPC board is provided with a glue injection hole, and the coil is glued to the FPC board and the cover plate through the glue injection hole. .

Further, the surface abutting the FPC board and the coil is a first surface, the surface abutting the FPC board and the cover plate is a second surface, and the glue injection hole is from the first surface A through hole formed through the second surface.

Further, the FPC board includes a side wall surface for connecting the first surface and the second surface, and the through hole is an opening formed by being recessed inward from the side wall surface.

Further, there are two glue injection holes, the two glue injection holes are arranged adjacently, and the opening directions of the two glue injection holes are opposite.

Further, the vibrator assembly includes a mass block provided with an accommodating cavity, a magnetic steel accommodated in the accommodating cavity, and a first spring bracket and a second spring bracket surrounding the mass block. Magnetic steels are arranged on both sides of the coil, the mass block includes a surface facing the FPC board as a third surface, and a fourth surface opposite to the third surface, the third surface and the fourth surface are respectively It is connected with the first spring bracket and the second spring bracket.

Further, the first spring support includes a first support connected with the third surface, a second support formed by extending from the first support to the fourth surface, and the second spring support includes a connection with the fourth surface. The connected third bracket, the fourth bracket formed by extending from the third bracket to the third surface, the second bracket and the fourth bracket are provided with auxiliary parts.

beneficial effect

The beneficial effects of the present invention are as follows: the linear motor of the present invention includes a cover plate, a stator assembly and a vibrator assembly fixed on the cover plate, and a casing that covers the stator assembly and the vibrator assembly inside the cover, so that the The stator assembly includes an FPC board fixed on the cover plate, and a coil glued on the FPC board, the FPC board is provided with a glue injection hole, and the coil is glued to the FPC board through the glue injection hole. The cover plate can fix the coil, the FPC plate and the cover plate at the same time, which is beneficial to enhance the bonding strength of the coil, the FPC plate and the cover plate.

Description of drawings

1 is a schematic structural diagram of a linear motor according to an embodiment of the present invention;

2 is a schematic diagram of an exploded structure of a linear motor according to an embodiment of the present invention;

FIG. 3 is a state diagram of gluing the coil, the FPC board and the cover plate according to the embodiment of the present invention.

Embodiments of the present invention

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Please refer to FIG. 1 to FIG. 3 , which is a linear motor provided by the present invention, which includes a cover plate 1 , a stator assembly 2 fixed on the cover plate 1 , a vibrator assembly 3 , and the stator assembly 1 and the vibrator assembly 3 are covered and arranged in The inner casing 4 and the stator assembly 2 include an FPC board 21 fixed on the cover plate 1 , and a coil 22 glued to the FPC board 21 . The FPC board 21 is provided with a glue injection hole 211 , and the coil 22 is glued to the FPC through the glue injection hole 211 Plate 21 , cover plate 1 .

The glue injection hole 211 is used for glue injection and glue overflow, and can provide an accommodation area for glue. The coil 22, the FPC board 21, and the cover plate 1 are fixed at the same time, providing the amount of glue that can be accommodated, which is beneficial to strengthen the coil 22, FPC The bonding strength of the plate 21 and the cover plate 1 reduces the probability that the coil 22 and the FPC plate 21 or the FPC plate 21 and the cover plate 1 are separated during the mechanical drop experiments. A through hole 41 is provided on one side of the casing 4 for the purpose of The FPC board 21 passes through.

Further, the surface where the FPC board 21 abuts against the coil 22 is the first surface 212 , the surface where the FPC board 21 abuts against the cover 1 is the second surface, and the glue injection hole 211 penetrates from the first surface 212 to the second surface For the formed through hole, the FPC board 21 includes a side wall surface 213 for connecting the first surface 212 and the second surface, and the through hole is an opening formed by inwardly recessed from the side wall surface 213 .

The use of half holes in this embodiment can better provide a accommodating area and provide the amount of glue to be accommodated, which is beneficial to enhance the bonding strength of the coil 22 , the FPC board 21 , and the cover plate 1 . Meanwhile, the U-shaped structure shown in the figure is included but not limited to the U-shaped structure shown in the figure.

Further, there are two glue injection holes 211 , the two glue injection holes 211 are arranged adjacent to each other, and the opening directions of the two glue injection holes 211 are opposite.

In this embodiment, the glue injection holes 211 are not limited to two, and can be increased as needed. The opposite opening direction can make better use of space for glue injection, and at the same time, it can avoid unevenness caused by glue injection and overflow.

Further, the vibrator assembly 3 includes a mass block 31 provided with an accommodating cavity 311 , a magnetic steel 32 accommodated in the accommodating cavity 311 , and a first spring support 5 and a second spring support 6 surrounding the mass block 31 , The magnetic steel 32 is arranged on both sides of the coil 22. The mass block 31 includes a surface facing the FPC board 21 as a third surface, and a fourth surface 312 opposite to the third surface. The third surface and the fourth surface 312 are respectively connected to the first spring. The bracket 5 and the second spring bracket 6 are connected.

The mass block 31 of this embodiment provides a counterweight to provide a vibration amount; it is used to fix the magnetic steel 32 to ensure the horizontal reciprocating driving force, and the coil 22 and the magnetic steel 32 are accommodated in the accommodating cavity 311, so that the vibrator is The structure of the assembly 3 is more compact, and the limited space can be used more effectively, and a mass block 31 with a heavier weight can be configured in the limited space to improve the vibration sense.

Further, the first spring bracket 5 includes a first bracket 51 connected to the third surface, a second bracket 52 extending from the first bracket 51 to the fourth surface 312 , and the second spring bracket 6 includes a connection to the fourth surface 312 The third bracket 61, the fourth bracket 62 extending from the third bracket 61 to the third surface, the second bracket 52 and the fourth bracket 62 are provided with auxiliary parts 7.

In this embodiment, the firmness of the vibrator assembly 3 is enhanced by the first spring bracket 5 and the second spring bracket 6 to ensure the consistency of the product frequency. There is a certain gap to ensure that the movement spaces on both sides of the first spring bracket 5 and the second spring bracket 6 are consistent, wherein the auxiliary member 7 may be a welding piece or a buffer member.

The above are only the embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these belong to The scope of protection of the utility model.

Claims

A linear motor includes a cover plate, a stator assembly fixed on the cover plate, a vibrator assembly, and a casing that covers the stator assembly and the vibrator assembly in the interior thereof, the stator assembly includes a stator assembly fixed on the cover plate. The FPC board and the coil glued to the FPC board are characterized in that the FPC board is provided with a glue injection hole, and the coil is glued to the FPC board and the cover plate through the glue injection hole.
The linear motor according to claim 1, wherein the surface of the FPC board in contact with the coil is the first surface, the surface of the FPC board in contact with the cover plate is the second surface, and the The glue injection hole is a through hole formed from the first surface to the second surface direction.
The linear motor of claim 2, wherein the FPC board includes a sidewall surface for connecting the first surface and the second surface, and the through hole is formed by concave inward from the sidewall surface open.
The linear motor according to claim 3, wherein there are two glue injection holes, the two glue injection holes are arranged adjacently, and the opening directions of the two glue injection holes are opposite.
The linear motor according to claim 4, wherein the vibrator assembly comprises a mass block provided with an accommodating cavity, a magnetic steel accommodated in the accommodating cavity, and a first mass block surrounding the mass block. A spring support and a second spring support, the magnetic steel is arranged on both sides of the coil, the mass block includes a surface facing the FPC board as a third surface, and a fourth surface opposite to the third surface , the third surface and the fourth surface are respectively connected with the first spring support and the second spring support.
The linear motor of claim 5, wherein the first spring bracket comprises a first bracket connected to the third surface, a second bracket extending from the first bracket to the fourth surface, The second spring bracket includes a third bracket connected to the fourth surface, a fourth bracket extending from the third bracket to the third surface, and auxiliary parts are provided on the second bracket and the fourth bracket.