Patent Application
20200227993
The invention relates to the technical field of electronic products. More specifically, the invention relates to a linear vibration motor.
With the development of communication technologies, portable electronic devices, such as a mobile phone, a tablet computer, an intelligent wearable device, a multimedia entertainment device, and the like, have become necessities for people. In these electronic devices, a micro linear vibration motor is generally used for system feedback, such as vibration feedback by clicking on a touch screen.
A linear vibration motor is a component that converts electric energy into mechanical vibration using an electromagnetic force principle, A conventional linear vibration motor is usually installed in a mobile communication terminal, a portable terminal, or the like, the motor is usually installed in an edge portion of a device, and generates vibration in a direction perpendicular to an object receiving vibration.
Conventional linear vibration motors generally include a housing having a receiving cavity in which located are a stator assembly, a vibrator assembly, and a resilient support member configured to suspend the vibrator assembly within the receiving cavity. The stator assembly may be a magnet or coil fixedly connected to the housing, and the vibration assembly corresponding thereto may be a coil or a magnet that vibrates up and down via the support of the resilient support member. The conventional magnets used as the stator assembly or the vibrator assembly are of a cylindrical solid core structure, and the coil surrounds the periphery of the magnet, After the coil is energized, the coil is subjected to an ampere force to generate an electromagnetic force, and interacts with a magnetic field generated by the magnet, so that the vibrator assembly moves upward and downward, thereby obtaining the effect of vibration of the whole linear vibration motor.
However, the conventional linear vibration motor has the following disadvantages:
1. The magnetic force line of the magnet is inefficiently utilized, which affects the overall tactile sensation.
2. The conventional motor assembly process is complicated, causing a large BOM cost and a waste of processing cost.
3. The conventional linear vibration motor is only applicable to vibration experience at a single frequency point, and does not meet the requirements for application of tactile feedback for multi-frequency point vibration.
4. The conventional magnets are usually adhesively fixed to the housing. When the motor is in operation, the magnets are simultaneously affected by the repulsion force of the vibration assembly and the self-gravity force. With the passage of time, the bonding strength between the magnets and the housing decreases, and separation of the bonding surfaces between the magnets and the housing tends to occur.
In practice, prior art bonding methods have not been able to meet the needs of practical work.
Accordingly, there is a need to provide a new linear vibration motor to solve the problems in the prior art described above.
It is an object of the present invention to provide a linear vibration motor in which the magnetism of a magnet can be maximized, the utilization efficiency of a magnetic force line of a coil magnet is increased, and the electromagnetic driving force of the motor is increased, thereby improving the tactile experience of the motor.
Another object of the present invention is to provide a linear vibration motor, which solves the problem of easy separation between a magnet and a housing due to an adhesive surface between the magnet and the housing for a long time by means of an improvement in a fixing structure between the magnet and the housing, and facilitates positioning and installation between the magnet and the housing by means of the improvement.
To achieve the above object, the present invention adopts the following technical solution:
A linear vibration motor, which comprises: a stator assembly comprising a housing having a receiving cavity, and a magnet located within the receiving cavity and jointly fixed to an inside surface of the housing, wherein the magnet comprises a hollow portion; a vibrator assembly comprising a coil and a mass, wherein the hollow portion extends in the vibration direction of the vibrator assembly, and when the vibrator assembly vibrates, the coil vibrates with the vibrator assembly and is inserted into the hollow portion of the magnet; a resilient support member configured to suspend the vibrator assembly within the receiving cavity of the housing, wherein the housing includes a fixing portion corresponding to the magnet, and the top surface of the magnet is jointly fixed to the bottom surface of the fixing portion.
Preferably, the fixing portion is formed by stamping the housing into the receiving cavity.
Preferably, the fixing portion is formed of an upper magnetic conductive plate jointly fixed to the inner side wall surface of the housing.
Preferably, at least a part of the top surface of the magnet is jointly fixed to at least a part of the bottom surface of the fixing portion.
Preferably, the magnet is jointly fixed to the outer edge of the bottom surface of the fixing portion through the top surface of the magnet.
Preferably, the magnet is jointly fixed to the inner edge of the bottom surface of the fixing portion through the top surface of the magnet.
Preferably, the fixing portion is jointly fixed to a central position of the top surface of the magnet through the bottom surface of the fixing portion.
Preferably; the magnet is jointly fixed to a central position of the bottom surface of the fixing portion through the top surface of the magnet.
Preferably, the top surface of the magnet further comprises a portion which, together with the side wall of the fixing portion and the inner side wall of the housing, forms an adhesive-containing groove.
Preferably, the bottom surface of the magnet is jointly fixed to a lower magnetic conductive plate.
1. According to the linear vibration motor provided by the present invention, by improving the magnet structure and the arrangement of the magnet and the coil, the magnetism of the magnet can be maximized, the utilization efficiency of the magnetic force line of the coil and magnet can be improved, the electromagnetic driving force of the motor can be improved, the effective frequency width of the motor can be increased due to the increase of the driving force, the application of the dual-frequency or multi-frequency resonance frequency can be facilitated, the requirement of vibration feeling provided by the motor at multiple frequency points can be met, and the tactile experience of the motor can be improved.
2. According to the linear vibration motor provided in the present invention, by the fixing portion which is formed by stamping the housing into the receiving cavity or formed of an upper magnetic conductive plate jointly fixed to the inner side wall surface of the housing, when a magnet is fixedly adhered to the fixed portion, an adhesive-containing groove is formed between the side wall of the fixed portion and the inner surface of the first housing, and an excessive amount of the adhesive can be applied to the adhesive-containing groove in a certain range, and excess adhesive is extruded to overflow the adhesive-containing groove, so that the bonding area and the adhesive containing amount between the magnet and the housing are increased by the improvement, so that the connection between the magnet and the housing is more firm and stable, and the positioning and mounting between the magnet and the housing are facilitated by the improvement, thereby facilitating the connection and fixing between the magnet and the housing.
The invention will now be described in further detail with reference to the accompanying drawings,
In the following description, for purposes of illustration, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
The term ‘mass’, as used in the description of the following detailed description may also be referred to as ‘clump weight’, each referring to one of the components that vibrates as a vibrator assembly in cooperation with a magnet or coil within the motor housing. In addition, the present invention is mainly used for the improvement of the linear vibration motor used in the description, and may also be referred to as a Y-direction vibration motor. However, in the following description of the embodiments for convenience of description, a linear vibration motor is specifically described as an example.
In order that the present invention may be more clearly described, the present invention will be further described with reference to the preferred embodiments and the accompanying drawings. However, it is needed to clarify that the phrase ‘top surface’, ‘upper surface’, ‘bottom surface’, ‘lower surface’, ‘top’, ‘bottom’, etc. in the description are not limitations to this invention, but examples with reference to drawings. The skilled in the art may appreciate that the above descriptions and the phrases should be understood according to the real function of the parts described by the phrases in the motor when the motor's position is changed.
The present invention provides an improved linear vibration motor, in which the arrangement of the magnet 2 provided with a hollow portion and the coil 3 is provided so as to maximize the magnetism of the magnet 2, improve the utilization efficiency of the magnetic force lines of the coil and the magnet, improve the electromagnetic driving force of the motor, increase the effective frequency width of the motor due to the increase of the driving force, facilitate the application of the dual-frequency or multi-frequency resonance frequency, meet the requirement of vibration of the motor at multiple frequency points, and improve the tactile experience of the motor; by providing a fixing portion 10 protruding inwardly on the inner surface of the first housing 11, the side wall of the fixing portion 10, together with the inner surface of the first housing 11, forms an adhesive-containing groove when the magnet 2 is fixedly adhered to the fixing portion 10. When adhesive is applied, excessive adhesive can be applied to the fixing portion 10 in a certain range, and excessive adhesive can be extruded to overflow the adhesive-containing groove, thereby increasing the bonding area and the adhesive containing amount, so that the fixing surface of the magnet 2 is more firm and stable. The present invention effectively solves the problems of insecure fixing of the magnet 2 and easy separation of the bonding surfaces after a long period of time, and the improvement enables the magnet 2 to provide a positioning function when fixed to the housing, thereby facilitating the connection and fixing between the magnet 2 and the housing.
Specifically, as shown in
A linear vibration motor according to the present embodiment includes a stator assembly comprising a housing 1 having a receiving cavity, a magnet 2 located in the receiving cavity and jointly fixed to the housing 1, wherein the magnet 2 comprises a hollow portion 21 extending in a vibration direction of the vibrator assembly; The magnet 2 of the present invention may be of a segmented or continuous annular structure, and the present invention is not limited thereto.
The linear vibration motor further includes a vibrator assembly comprising a coil 3 disposed coaxially with the magnet 2 and a mass 4 disposed coaxially with the coil 3 around the periphery of the coil 3; when the vibrator assembly vibrates, the coil 3 vibrates with the vibrator assembly and is inserted into the hollow portion 21 of the magnet 2.
The linear vibration motor further includes a resilient support member 5 configured to suspend the vibrator assembly in the receiving cavity of the housing 1.
The housing includes a fixing portion 10 disposed coaxially with the magnet, and a top surface of the magnet 2 is jointly fixed to a bottom surface of the fixing portion 10. In the present invention, the fixing portion 10 may be of a segmented or continuous annular structure, and the present invention is not limited thereto.
Further, the housing 1 includes a first housing 11 having an opening at the bottom, and a second housing 12 jointly fixed to the opening; The first housing 11 and the second housing 12 constitute a housing 1 having a receiving cavity. It should be noted that in the present invention, the first housing 11 and the second housing 12 are each made of a material having a magnetic permeability, so that the magnetic force lines of the magnet are closed, and the magnetic action of the magnet 2 is maximized so as to lift the electromagnetic driving force of the motor. As a specific embodiment of the present invention, as shown in
According to the present invention, a magnet 2 having an annular structure, which is jointly fixed to the inner side surface of the top wall of the first housing 11, is used as a stator assembly, and a part of the coil 3 serving as the vibrator assembly is vibrationally inserted into a hollow portion 21 of the magnet 2. The magnet 2 having an annular structure serving as a stator and a configuration of the magnet 2 and the coil 3 serving as the vibrator are arranged in such a manner that, compared with a cylindrical solid core structure magnet used in a conventional vibration motor, a magnetic force line of a conventional cylindrical solid core magnet is radially distributed outwardly from a central axis, and the magnetic force line of the annular structure magnet of the present invention is collected on a central axis, so that a magnetic field strength of a coil provided on the central axis of the annular structure magnet is higher than that of a coil sleeved on the periphery of the cylindrical solid core magnet; Moreover, the coil of the present invention is arranged in the inner space of the ring-shaped structure magnet, and the diameter size of the coil is small, so that the number of effective turns of the coil is significantly higher than the number of effective turns of the large-diameter coil arranged on the periphery of the cylindrical solid core magnet. Therefore, the linear vibration motor provided by the present invention can maximize the magnetism of the magnet, improve the utilization efficiency of the magnetic force line of the coil and magnet, improve the electromagnetic driving force of the motor, increase the effective frequency width of the motor due to the increase of the driving force, facilitate the application of the dual-frequency or multi-frequency resonance frequency, meet the requirement of vibration sense provided by the motor at multiple frequency points, improve the tactile experience of the motor, and improve the overall comprehensive performance of the linear vibration motor.
In addition, the present invention provides an improvement in a fixing manner in which the housing includes a fixing portion 10 provided in correspondence with the magnet, and a top surface of the magnet 2 is jointly fixed to a bottom surface of the fixing portion 10.
In order to explain in more detail how the fixing portion 10 is formed, as shown in
Further,
Further, when a part of the bottom surface of the fixing portion is jointed to a part of the top surface of the magnet, the present invention provides two preferred embodiments for specific description: 1. the top surface 102 of the magnet 2 is fixed in conjunction with the outer edge of the bottom surface 101 of the fixing portion 10; 2. The top surface of the magnet is jointly fixed to the inner edge of the bottom surface of the fixing portion. In order to clearly explain the two cases, the preferred embodiments 1 and 2 are respectively shown in
In addition, when a part of the fixing portion bottom surface 101 is jointed to the whole magnet top surface 102, the present invention exemplifies a case, as shown in
Further, when the whole fixing portion bottom surface 101 is jointed to the part of the magnet top surface 102, two preferred embodiments of the present invention are exemplified for the sake of specific description. As shown in
Further, when the whole fixed portion bottom surface 101 is jointed to the whole magnet top surface 102, as shown in
In addition, while the fixing portion 10 is formed, a lower magnetic conductive plate 13 is fixed on the bottom surface of the magnet. The magnetic induction line in the space formed by the first housing 11 and the horizontal plane of the lower magnetic conductive plate 13 is uniform and stable as shown in
Obviously, the above-described embodiments of the present invention are merely illustrative of the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art, based on the above description, will be able to make other variations or variations, which are not intended to be exhaustive of all the embodiments, and the obvious variations or variations which may arise from the technical solutions of the present invention still fall within the scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201721005133.3 | Aug 2017 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2017/112170 | 11/21/2017 | WO | 00 |
