CN110266171B - Vibration motor - Google Patents
Vibration motor Download PDFInfo
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- CN110266171B CN110266171B CN201910439272.4A CN201910439272A CN110266171B CN 110266171 B CN110266171 B CN 110266171B CN 201910439272 A CN201910439272 A CN 201910439272A CN 110266171 B CN110266171 B CN 110266171B
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- vibration
- cover plate
- magnetic steel
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- elastic
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/34—Reciprocating, oscillating or vibrating parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/18—Machines moving with multiple degrees of freedom
Abstract
The invention provides a vibration motor, which comprises a base, a vibration unit, an elastic piece and a coil assembly, wherein the vibration unit is arranged on the base; the vibration unit comprises a mass block and magnetic steel; the vibration unit comprises a mass block supported on the elastic part and magnetic steel which is fixed on the mass block and is arranged opposite to the coil assembly; the magnetizing direction of the magnetic steel is the thickness direction; the coil component is provided with a vibration unit, the vibration unit is supported by the elastic piece to vibrate along a direction perpendicular to a magnetizing direction, and the vibration unit is enabled to vibrate along any one direction of a first vibration direction perpendicular to the magnetizing direction, a second vibration direction perpendicular to the magnetizing direction and perpendicular to the first vibration direction and a third vibration direction on the plane where the first vibration direction and the second vibration direction are located by adjusting the driving signal. Compared with the related art, the vibration motor disclosed by the invention realizes multidirectional vibration and has an excellent vibration effect.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of motors, and more particularly, to a vibration motor for a portable consumer electronic product.
[ background of the invention ]
With the development of electronic technology, portable consumer electronic products are more and more sought after by people, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment devices, and the like, generally use vibration motors to perform system feedback, such as incoming call prompt, information prompt, navigation prompt, vibration feedback of game consoles, and the like. Such a wide application requires a vibration motor having high performance, good stability and long service life.
The linear vibration motor of the related art includes a base having an accommodating space, a vibration unit located in the accommodating space, an elastic member fixing and suspending the vibration unit in the accommodating space, and a coil fixed to the base, and the vibration unit is driven to perform reciprocating linear motion to generate vibration by interaction between a magnetic field generated by energizing the coil and a magnetic field generated by the vibration unit.
However, in the related art linear vibration motor, the linear vibration unit can perform linear vibration only in one direction, and the vibration effect is single.
Therefore, it is necessary to provide a new vibration motor to solve the above problems.
[ summary of the invention ]
The invention aims to provide a vibration motor, which can realize bidirectional vibration and has excellent vibration effect.
In order to solve the above technical problems, the present invention provides a vibration motor, which includes a base having an accommodating space, a vibration assembly disposed in the accommodating space, and a coil assembly fixed to the base and driving the vibration assembly to vibrate, wherein the vibration assembly includes an elastic member fixed to the base and a vibration unit suspended in the accommodating space via the elastic member, and the vibration unit includes a mass block supported by the elastic member and magnetic steel fixed to the mass block and disposed opposite to the coil assembly; the magnetizing direction of the magnetic steel is the thickness direction; applying a driving signal to the coil assembly, wherein the elastic member supports the vibration unit to vibrate along a first vibration direction perpendicular to a magnetizing direction or along a second vibration direction perpendicular to the magnetizing direction and the first vibration direction or along a third vibration direction which is located on a plane of the first vibration direction and the second vibration direction and does not coincide with the first vibration direction and the second vibration direction, the vibration assembly has a first natural resonance frequency at which the vibration unit vibrates along the first vibration direction and a second natural resonance frequency at which the vibration unit vibrates along the second vibration direction, and the vibration unit vibrates along any one of the first vibration direction, the second vibration direction and the third vibration direction by adjusting the driving signal.
Preferably, when the frequency of the driving signal corresponds to the first natural resonant frequency, the vibration unit vibrates in the first vibration direction, and the first vibration direction is a straight line.
Preferably, when the frequency of the driving signal corresponds to the second natural resonant frequency, the vibration unit vibrates in the second vibration direction, and the second vibration direction is a straight line.
Preferably, when the frequency of the driving signal corresponds to both the first natural resonance frequency and the second natural resonance frequency, the vibration unit vibrates in the third vibration direction, and the third vibration direction is nonlinear.
Preferably, when the vibration unit vibrates in the third vibration direction, the shape of the non-straight line changes in accordance with a change in the driving signal.
Preferably, the magnetic steel comprises a first magnetic steel and a second magnetic steel which are fixedly connected with each other, and the magnetizing directions of the first magnetic steel and the second magnetic steel are opposite.
Preferably, the base has the first lateral wall that relative interval set up and connects the second lateral wall of first lateral wall, the elastic component is including being fixed in the first fixed arm of second lateral wall, by the both ends of first fixed arm are faced respectively first lateral wall just encircle the first elastic arm that the vibration unit extended, by first elastic arm is kept away from the one end orientation of first fixed arm the quality piece just encircles the second elastic arm that the vibration unit buckled and extended and by the second elastic arm is kept away from the second elastic arm the second fixed arm that the one end of first elastic arm extended, the second fixed arm is fixed in the quality piece.
Preferably, the mass block comprises a pair of first mass blocks which are oppositely arranged, the first mass blocks are arranged along the first side wall at intervals, and the second fixing arm is fixedly connected with the first mass blocks.
Preferably, the mass block further comprises a pair of second mass blocks connected with the first mass block and arranged at intervals oppositely, a through hole is formed by the first mass block and the second mass block in a surrounding mode, and the first magnetic steel and the second magnetic steel are contained in the through hole.
Preferably, the first fixing arm, the first elastic arm, the second elastic arm and the second fixing arm are surrounded to form the elastic part with an open end, the number of the elastic parts is two, and the open ends of the two elastic parts are oppositely arranged.
Preferably, the first fixing arm, the first elastic arm, the second elastic arm and the second fixing arm are surrounded to form the elastic part with an open end, the number of the elastic parts is two, and the open ends of the two elastic parts are oppositely arranged.
Preferably, the two elastic pieces are arranged at intervals along the magnetizing direction.
Preferably, the joint surface of the first magnetic steel and the second magnetic steel is parallel to the magnetizing direction.
Preferably, the joint surface and the first vibration direction form an included angle α, and the following conditional expression is satisfied: alpha is more than or equal to 0 degree and less than or equal to 90 degrees.
Preferably, the base includes a housing, and an upper cover plate and a lower cover plate respectively covering the housing, the upper cover plate and the lower cover plate together enclose the accommodating space, the elastic member is fixed to the housing, and the coil assembly is fixed to the upper cover plate and/or the lower cover plate.
Preferably, the coil assembly comprises an iron core fixed on the upper cover plate and/or the lower cover plate and a coil wound on the iron core, and the iron core is positioned along the magnetizing direction and the orthographic projection of the magnetic steel simultaneously falls into the first magnetic steel and the second magnetic steel.
Preferably, the number of the coil assemblies is two, and the two coil assemblies are respectively fixed to the upper cover plate and the lower cover plate.
Preferably, the vibration motor further includes a flexible printed circuit board fixed to the lower cover plate and electrically connected to the coil assembly.
Preferably, the lower cover plate includes a fixing plate extending from the edge to a position far away from the accommodating space, the flexible printed circuit board includes an outer connecting portion electrically connected to an external circuit and an inner connecting portion electrically connected to the coil assembly, and the outer connecting portion is attached to and fixed to the fixing plate.
Preferably, the coil assembly includes a first coil assembly fixed to the lower cover plate and a second coil assembly fixed to the upper cover plate, the inner connecting portion includes a first connecting member electrically connected to the first coil assembly and a second connecting member electrically connected to the second coil assembly, the first connecting member is attached to the lower cover plate, the second connecting member includes a first extending portion extending perpendicularly from one end of the outer connecting portion close to the accommodating space toward the upper cover plate and a second extending portion extending perpendicularly from one end of the first extending portion away from the outer connecting portion toward the accommodating space, and the second extending portion is electrically connected to the second coil assembly.
Preferably, the first extension is spaced apart from the base.
Compared with the prior art, the vibration unit comprises a mass block supported on the elastic part and magnetic steels respectively arranged opposite to the coil assemblies; the vibration unit comprises a mass block supported on the elastic part and magnetic steel which is fixed on the mass block and is arranged opposite to the coil assembly; the magnetic steel is magnetized along the thickness direction; the vibration unit is along the perpendicular to the first vibration direction of the direction of magnetizing of magnet steel, along perpendicular to direction of magnetizing and perpendicular to the second vibration direction of first vibration direction, along being located first vibration direction with arbitrary direction vibration in the planar third vibration direction in second vibration direction place makes vibrating motor can follow a plurality of directions and realize the vibration, has optimized the vibration effect.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a perspective view illustrating a vibration motor according to the present invention;
fig. 2 is an exploded view of a partial perspective structure of the vibration motor of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 4 is an exploded perspective view of the outer housing and the vibration unit of the present invention;
FIG. 5 is an assembly view of the partial structure of the outer housing and the vibration unit of the present invention;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a perspective view of the flexible circuit board of the present invention;
fig. 8 is a schematic view showing the vibration direction of the vibration motor of the present invention;
FIG. 9 is a cross-sectional view taken along line B-B of FIG. 1;
fig. 10 is an assembly view of a part of the structure of a vibration motor according to another embodiment of the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-10, the present invention provides a vibration motor 100, which includes a base 1, a vibration unit 2, an elastic member 3, a coil assembly 4 and a flexible circuit board 5, wherein the vibration unit 2 and the elastic member 3 form a vibration assembly 6.
The base 1 has a receiving space 10 for receiving the vibration assembly 6 and the coil assembly 4.
The base 1 may be an integral structure or a separate structure. For example, in the present embodiment, the base 1 is a separate structure, and includes an outer housing 11, and an upper cover plate 12 and a lower cover plate 13 that are respectively covered on the outer housing 11, and the outer housing 11, the upper cover plate 12, and the lower cover plate 13 together enclose the accommodating space 10. Specifically, the outer casing 11 includes a first sidewall 111 disposed at an interval and a second sidewall 112 connected to the first sidewall 111 and disposed at an interval.
Further, the lower cover plate 13 includes a fixing plate 131 extending from an edge to a position far away from the accommodating space 10, and the fixing plate 131 is used for providing fixing support for the flexible printed circuit board 5.
The vibration unit 2 is accommodated in the accommodating space 10.
In the present embodiment, the vibration unit 2 includes a mass 21 supported by the elastic member 3, and a magnetic steel 22 fixed to the mass 21 and disposed opposite to the coil block 4; the magnetic steel 22 includes a first magnetic steel 221 and a second magnetic steel 222 which are magnetized along the magnetizing direction M, respectively, and the magnetizing directions of the first magnetic steel 221 and the second magnetic steel 222 are opposite, for example, as shown in fig. 3, the magnetic pole of the upper cover plate 12 close to the first magnetic steel 221 is an N pole, which is close to the magnetic pole of the lower cover plate 13 is an S pole, and the magnetic pole of the upper cover plate 12 close to the second magnetic steel 222 is an S pole, which is close to the magnetic pole of the lower cover plate 13 is an N pole.
It should be noted that the first magnetic steel 221 and the second magnetic steel 222 may be an integral structure or a separate structure, for example, in the present embodiment, the first magnetic steel 221 and the second magnetic steel 222 are separate structures, and the first magnetic steel 221 and the second magnetic steel 222 are abutted to each other and respectively fixedly received in the receiving hole 210.
Further, the magnetizing directions of the first magnetic steel 221 and the second magnetic steel 222 are both along the thickness direction, the bonding surface 220 of the first magnetic steel 221 and the second magnetic steel 222 is parallel to the magnetizing direction, and the magnetizing direction is defined as M;
in order to explain the vibration principle of the vibration unit 2 more clearly, it should be noted that, referring to fig. 6 and 8, the vibration motor 100 can vibrate along a first vibration direction D1 perpendicular to a magnetization direction M of the magnetic steel, along a second vibration direction D2 perpendicular to the magnetization direction M and to the first vibration direction D1, or along a third vibration direction D3 located on a plane where the first vibration direction D1 and the second vibration direction D2 are located, defining the first vibration direction D1 along a Y-axis direction, the second vibration direction D2 is along the X-axis direction, and the first vibration direction D1 and the second vibration direction D2 are perpendicular to each other on the horizontal plane, it should be noted that, the third vibration direction D3 is located in the same plane, i.e. horizontal plane, as the first vibration direction D1 and the second vibration direction D2; the magnetizing direction M of the vibration motor 100 is along the Z-axis direction, and the magnetizing direction M is perpendicular to the first vibration direction D1, the second vibration direction D2, and the third vibration direction D3, that is, the magnetizing direction M is perpendicular to the horizontal plane where the first vibration direction D1, the second vibration direction D2, and the third vibration direction D3 are located.
Furthermore, the structural forms of the first magnetic steel 221 and the second magnetic steel 222 are not limited. The first magnetic steel 221 and the second magnetic steel 222 may be in one of a right triangle, a right trapezoid, or a fan shape, for example, in this embodiment, the first magnetic steel 221 and the second magnetic steel 222 are both in a right triangle, and the bonding surface 220 is located at a position of a hypotenuse of the first magnetic steel 221 and the second magnetic steel 222 in a right triangle. And the joint surface 220 forms an included angle alpha with the direction of the first vibration D1, and the alpha is more than or equal to 0 degree and less than or equal to 90 degrees.
The elastic piece 3 suspends the vibration unit 2 in the accommodating space 10, and provides a vibration condition for the vibration unit 2; specifically, the elastic member 3 is fixed to the outer case 11.
In this embodiment, as shown in fig. 9, the elastic member 3 includes two elastic members 3 stacked at an interval along the magnetization direction M, each of the elastic members 3 includes a first fixing arm 31 fixed to the second side wall 112, a first elastic arm 32 extending from both ends of the first fixing arm 31 toward the first side wall 111 and around the vibration unit 2, a second elastic arm 33 extending from one end of the first elastic arm 32 away from the first fixing arm 31 toward the mass block 21 and bending around the vibration unit 2, and a second fixing arm 34 extending from one end of the second elastic arm 33 away from the first elastic arm 33, and the second fixing arm 34 is fixed to the mass block 21; referring to fig. 6, the second elastic arm 32 and the third elastic arm 33 are both spaced from the mass 21 and the outer housing 11; the first fixing arm 31, the first elastic arm 32, the second elastic arm 33 and the second fixing arm 34 are enclosed to form the elastic member 3 with an open end, and the open ends of the two elastic members 3 are opposite to each other, as shown in fig. 4 and 5, it can be understood that one first fixing arm 31 of the elastic member 3 is fixed on each second side wall 112, and the heights of the two first fixing arms 31 along the magnetizing direction M are different. It should be noted that the mass block 21 includes a pair of first mass blocks 211 oppositely disposed, the first mass blocks 211 are disposed at intervals along the first side wall 111, and the second fixing arm 34 is fixedly connected to the first mass blocks 211; in this embodiment, the mass block 21 is annular, and further includes a pair of second mass blocks 212 connected to the first mass block 211 and disposed at an opposite interval, wherein the second mass blocks 212 are parallel to the second sidewall 112; the first mass block 211 and the second mass block 212 enclose a through hole 210, and the first magnetic steel 221 and the second magnetic steel 222 are accommodated in the through hole 210; in other embodiments, as shown in fig. 10, the mass may comprise only the first mass 211 ', as long as the magnetic steel can be fixed to the mass 211 ' and connected to the elastic element 3 '.
The two first elastic arms 32 and the two second elastic arms 33 are arranged in a suspended manner, the first elastic arms 32 and the second elastic arms 33 have elasticity, and in the vibration process, vibration can be provided for the vibration unit 2 to provide vibration elasticity and supporting force, so that the vibration unit 2 makes reciprocating elastic motion under the combined action of the elasticity and the electromagnetic driving force.
The coil assembly 4 is fixed on the base 1 to drive the vibration unit 2 to vibrate.
In this embodiment, the coil assembly 4 includes an iron core fixed to the upper cover plate 12 and/or the lower cover plate 13 and a coil wound around the iron core, and the iron core falls into the first magnetic steel 221 and the second magnetic steel 222 simultaneously along an orthographic projection of the magnetic steel 22 in the magnetizing direction M. When the coil is energized, the core is polarized in a magnetizing direction M.
It should be noted that the number and the position of the coil assemblies 4 are not limited, and the coil assemblies can be specifically arranged according to the requirements of actual design.
As an alternative embodiment, the coil assemblies 4 include two coil assemblies 4, two of the coil assemblies 4 are a first coil assembly 41 fixed to the lower cover plate 13 and a second coil assembly 42 fixed to the upper cover plate 12, the first coil assembly 41 includes a first iron core 411 and a first coil 412 wound around the first iron core 411, the second coil assembly 42 includes a second iron core 421 and a second coil 422 wound around the second iron core 421, the magnetizing directions of the first coil 412 and the second coil 422 are the same, for example, as shown in fig. 3, when the first coil 412 is energized, the first iron core 411 is polarized, the top magnetic pole of the first iron core 411 is an N pole, and the bottom magnetic poles are both S poles; the second coil 422 is energized to polarize the second iron core 421, and the top magnetic pole of the second iron core 421 is an N pole, and the bottom magnetic poles are S poles. The flexible circuit board 5 is fixed to the lower cover plate 13 and electrically connected to the coil assembly 4, so as to supply power to the coil assembly 4.
In this embodiment, the flexible wiring board 5 includes an external connection portion 51 electrically connected to an external circuit and an internal connection portion 52 electrically connected to the coil block 4, and the external connection portion 51 is attached and fixed to the fixing plate 131.
Further, the inner connecting portion 52 includes a first connecting member 521 electrically connected to the first coil 412 and a second connecting member 522 electrically connected to the second coil 422, the first connecting member 521 is attached to the lower cover plate 13, the second connecting member 522 includes a first extending portion 5221 extending vertically from one end of the outer connecting portion 51 close to the accommodating space 10 toward the upper cover plate 12 and a second extending portion 5222 extending from one end of the first extending portion 5221 away from the outer connecting portion 51 toward the accommodating space 10, and the second extending portion 5222 is electrically connected to the second coil assembly 42; further, the first extension 5221 is spaced apart from the base 1.
In the above structure, the same flexible circuit board 5 is respectively connected to the first coil 412 and the second coil 422, so that the energizing directions of the first coil 412 and the second coil 422 are the same, and the polarization directions of the first iron core 411 and the second iron core 421 are the same.
The specific structure of the vibration motor 100 is described above, and please refer to fig. 3 and fig. 5-6, which will be described below in conjunction with the specific structure of the vibration motor 100 to explain the vibration principle:
when the motor is powered in the forward direction (fig. 3 is a schematic diagram of the vibration motor when the motor is powered in the forward direction), the two coil assemblies 4 are magnetized, the two coil assemblies 4, the first magnetic steel 221 and the second magnetic steel 222 form a magnetic loop together, one side of the second iron core 421 close to the magnetic steel 22 is polarized to be an S pole, under the action of a magnetic field, the N pole of the first magnetic steel 221 is attracted by the S pole, and the S pole of the second magnetic steel 222 is repelled by the S pole, so that the first magnetic steel 221 and the second magnetic steel 222 generate a driving force perpendicular to the joint surface 220 towards the left on the side close to the upper cover plate 12; one side of the first iron core 411 close to the magnetic steel 22 is polarized to be an N pole, and under the action of a magnetic field, the S pole of the first magnetic steel 221 is attracted by the N pole, and the N pole of the second magnetic steel 222 is repelled by the N pole, so that the first magnetic steel 221 and the second magnetic steel 222 generate a leftward driving force perpendicular to the joint surface 220 at one side close to the lower cover plate 13. In this case, an electromagnetic driving force to the left perpendicular to the joint surface 220 is generated as a whole.
On the contrary, when the reverse current is applied, the magnetizing direction of the coil assembly 4 is reversed, that is, the top pole of the first iron core 411 is N-pole and the bottom pole is S-pole, and the top pole of the second iron core 421 is N-pole and the bottom pole is S-pole, so that the magnetic steel 22 generates an electromagnetic driving force perpendicular to the junction surface 220 and rightward as a whole.
Under the action of the electromagnetic driving force, the two elastic pieces 3 respectively have the tendency of moving along the direction of the electromagnetic driving force, and under the combined action of the electromagnetic driving force and the elastic force, the vibration unit 2 is enabled to vibrate.
The vibration assembly 6 composed of the elastic member 3 and the vibration unit 2 has a first natural vibration frequency that causes the vibration unit 2 to vibrate in the first vibration direction and a second natural vibration frequency that causes the vibration unit to vibrate in the second vibration direction. In general, the first natural vibration frequency and the second natural vibration frequency are set according to a vibration frequency range of the vibration motor.
When the frequency of the driving signal corresponds to the first natural resonant frequency, at this time, the mode of the vibration assembly 6 in the first vibration direction D1 is excited, and the elastic element 3 drives the vibration unit 2 to vibrate back and forth in the first vibration direction D1. In this embodiment, the vibration unit 2 linearly reciprocates in the first vibration direction D1. It should be emphasized that the frequency of the driving signal corresponding to the first natural frequency means that a frequency signal included in the driving signal is equal to or close to the first natural frequency, so that a mode corresponding to the first natural frequency can be excited.
When the frequency of the driving signal corresponds to the second natural resonant frequency, the mode of the vibration assembly 6 along the second vibration direction D2 is excited, and the elastic element 3 drives the vibration unit 2 to vibrate back and forth along the second vibration direction D2. In this embodiment, the vibration unit 2 linearly reciprocates along the second vibration direction D2. It should be emphasized that the frequency of the driving signal corresponding to the second natural frequency is that a frequency signal included in the driving signal is equal to or close to the second natural frequency, so that a mode corresponding to the second natural frequency can be excited.
When the driving signal corresponds to the first natural resonant frequency and the second natural resonant frequency simultaneously, the modes of the vibration assembly 6 along the first vibration direction D1 and the second vibration direction D2 are excited simultaneously, and at this time, under the effect of the resultant force, the elastic element 3 drives the vibration unit 2 to vibrate along the third vibration direction D3, which can be regarded as oblique vibration with reference to fig. 8, and the third vibration direction D3 is located in any direction between the X axis and the Y axis and is determined mainly by the driving signal. In this embodiment, the vibration unit 2 moves non-linearly along the third vibration direction D3, and the curve shown in fig. 8 is only a schematic diagram and does not represent the movement locus of the third vibration direction D3. Specifically, when the vibration unit 2 is driven to vibrate in the third vibration direction D3 by the driving signal received by the vibration motor 100, the shape of the non-straight line changes with the change of the driving signal, and is not limited to a certain non-straight line. Specifically, it can be understood that the non-linear shape, i.e. the motion trajectory of the vibration unit 2 along the third vibration direction D3, is determined by the ratio of the first vibration frequency and the second vibration frequency in the driving signal, when the component of the first vibration frequency is higher than the component of the second vibration frequency, the third vibration direction D3 is closer to the first vibration direction D1, and when the component of the first vibration frequency is lower than the component of the second vibration frequency, the third vibration direction D3 is closer to the second vibration direction D2; it should be noted that the driving signal is not limited to be embodied in the form of a frequency.
It should be emphasized here that the frequency of the driving signal corresponds to the first natural frequency, which means that a frequency signal included in the driving signal is equal to or close to the first natural frequency, so that a mode corresponding to the first natural frequency can be excited.
The vibration unit 2 can realize the vibration in any one direction of the first vibration direction D1, the second vibration direction D2 and the third vibration direction D3, so that the vibration motor 100 can vibrate in multiple directions, and the vibration motor 100 can realize multiple vibration effects, thereby achieving the purpose of optimizing the vibration performance.
It should be noted that, under the condition of power-on, the direction and the magnitude of the electromagnetic driving force generated by the coil assembly 4 and the magnetic steel 22 are related to the included angle α, in practical applications, the adjustment of the direction and the magnitude of the electromagnetic driving force can be realized by adjusting the included angle α, and the resultant force of the electromagnetic driving force and the elastic force generated by the elastic member 3 is also changed, so as to achieve the purpose of adjusting the vibration effect of the vibration unit 2, and it should be noted that, when the included angle α is 0 degree or 90 degrees, the vibration unit 2 vibrates in the first vibration direction D1 or the second vibration direction D2, and vibrates in a single direction. As shown in fig. 10, in another embodiment of the present invention, an angle α ' between the joint surface 220 ' between the first magnetic steel 221 ' and the second magnetic steel 222 ' and the first vibration direction D1 ' is 90 degrees, and at this time, the vibration unit 2 ' vibrates unidirectionally along the first vibration direction D1 '.
Compared with the prior art, in the vibration motor, the vibration unit comprises the mass block supported on the elastic part and the magnetic steels respectively arranged opposite to the coil assemblies; the vibration unit comprises a mass block supported on the elastic part and magnetic steel which is fixed on the mass block and is arranged opposite to the coil assembly; the magnetic steel is magnetized along the thickness direction; the vibration unit is along the perpendicular to the first vibration direction of the direction of magnetizing of magnet steel, along perpendicular to direction of magnetizing and perpendicular to the second vibration direction of first vibration direction, along being located first vibration direction with any one direction vibration in the planar third vibration direction in second vibration direction place makes vibrating motor can follow a plurality of directions and realize the vibration, has optimized the vibration effect.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (16)
1. A vibration motor comprises a base with an accommodating space, a vibration assembly arranged in the accommodating space and a coil assembly which is fixed on the base and drives the vibration assembly to vibrate, wherein the vibration assembly comprises an elastic piece fixed on the base and a vibration unit suspended in the accommodating space through the elastic piece; the magnetizing direction of the magnetic steel is the thickness direction; the magnetic steel comprises a first magnetic steel and a second magnetic steel which are fixedly connected with each other, and the magnetizing directions of the first magnetic steel and the second magnetic steel are opposite; applying a driving signal to the coil assembly, wherein the elastic member supports the vibration unit to vibrate along a first vibration direction perpendicular to a magnetizing direction or along a second vibration direction perpendicular to the magnetizing direction and the first vibration direction or along a third vibration direction which is located on a plane of the first vibration direction and the second vibration direction and is not overlapped with the first vibration direction and the second vibration direction, the vibration assembly has a first natural resonance frequency which enables the vibration unit to vibrate along the first vibration direction and a second natural resonance frequency which enables the vibration unit to vibrate along the second vibration direction, the vibration unit is enabled to vibrate along any one of the first vibration direction, the second vibration direction and the third vibration direction by adjusting the driving signal, and a joint surface of the first magnetic steel and the second magnetic steel is parallel to the magnetizing direction, the joint surface and the first vibration direction form an included angle alpha and satisfy the following conditional expression: alpha is more than or equal to 0 degree and less than or equal to 90 degrees; the base includes the shell body and covers respectively and locates the upper cover plate and the lower cover plate of shell body, the shell body the upper cover plate with the lower cover plate encloses jointly accommodating space, coil pack is fixed in the upper cover plate and/or the lower cover plate, coil pack is including being fixed in the upper cover plate and/or the iron core of lower cover plate with around locating the coil of iron core, the iron core is in along the direction of magnetizing the orthographic projection of magnet steel falls into simultaneously first magnet steel with the second magnet steel.
2. The vibration motor according to claim 1, wherein the vibration unit vibrates in the first vibration direction when the frequency of the drive signal corresponds to the first natural resonance frequency, the first vibration direction being a straight line.
3. The vibration motor according to claim 1, wherein when the frequency of the drive signal corresponds to the second natural resonance frequency, the vibration unit vibrates in the second vibration direction, which is a straight line.
4. The vibration motor according to claim 1, wherein when the frequency of the drive signal corresponds to both the first natural resonance frequency and the second natural resonance frequency, the vibration unit vibrates in the third vibration direction, which is nonlinear.
5. The vibration motor according to claim 4, wherein the shape of the non-straight line changes with a change in the drive signal when the vibration unit vibrates in the third vibration direction.
6. The vibration motor of claim 1, wherein the base has a first sidewall and a second sidewall connected to the first sidewall, the first sidewall being fixed to the second sidewall, the elastic member includes a first elastic arm extending from both ends of the first elastic arm toward the first sidewall and around the vibration unit, a second elastic arm extending from an end of the first elastic arm away from the first fixed arm toward the mass and bending around the vibration unit, and a second elastic arm extending from an end of the second elastic arm away from the first elastic arm, the second elastic arm being fixed to the mass.
7. The vibration motor of claim 6 wherein said mass comprises a pair of oppositely disposed first masses, said first masses being spaced apart along said first side wall, said second fixed arm being fixedly connected to said first masses.
8. The vibration motor of claim 7, wherein the mass further comprises a pair of second masses connected to the first mass and disposed at an opposite interval, the first mass and the second mass enclose a through hole, and the first magnetic steel and the second magnetic steel are received in the through hole.
9. The vibration motor according to claim 6, wherein said first fixing arm, said first elastic arm, said second elastic arm and said second fixing arm are enclosed as said elastic member having an open end, and said elastic members are two, and said open ends of said two elastic members are disposed opposite to each other.
10. The vibration motor of claim 1, wherein the two elastic members are spaced apart from each other in a magnetizing direction.
11. The vibration motor of claim 1, wherein the elastic member is fixed to the outer case.
12. The vibration motor according to claim 1, wherein the coil assembly includes two coil assemblies, and the two coil assemblies are fixed to the upper cover plate and the lower cover plate, respectively.
13. The vibration motor according to claim 1, further comprising a flexible wiring board fixed to the lower cover plate and electrically connected to the coil block.
14. The vibration motor of claim 13, wherein the lower cover plate comprises a fixing plate extending from an edge to a position far away from the receiving space, the flexible printed circuit board comprises an outer connecting portion electrically connected with an external circuit and an inner connecting portion electrically connected with the coil assembly, and the outer connecting portion is attached and fixed to the fixing plate.
15. The vibration motor according to claim 14, wherein the coil assembly includes a first coil assembly fixed to the lower cover plate and a second coil assembly fixed to the upper cover plate, the inner connecting portion includes a first connecting member electrically connected to the first coil assembly and a second connecting member electrically connected to the second coil assembly, the first connecting member is attached to the lower cover plate, the second connecting member includes a first extending portion extending vertically from an end of the outer connecting portion close to the accommodating space toward the upper cover plate and a second extending portion extending from an end of the first extending portion away from the outer connecting portion toward the accommodating space, and the second extending portion is electrically connected to the second coil assembly.
16. The vibration motor of claim 15 wherein the first extension is spaced from the base.
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| CN201910439272.4A CN110266171B (en) | 2019-05-24 | 2019-05-24 | Vibration motor |
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| CN201910439272.4A CN110266171B (en) | 2019-05-24 | 2019-05-24 | Vibration motor |
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| CN110266171B true CN110266171B (en) | 2021-11-12 |
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| WO2021134246A1 (en) * | 2019-12-30 | 2021-07-08 | 瑞声声学科技(深圳)有限公司 | Linear vibration motor |
| WO2021134319A1 (en) * | 2019-12-30 | 2021-07-08 | 瑞声声学科技(深圳)有限公司 | Linear vibration motor |
| WO2021134361A1 (en) * | 2019-12-30 | 2021-07-08 | 瑞声声学科技(深圳)有限公司 | Vibration electric motor |
| WO2021134243A1 (en) * | 2019-12-30 | 2021-07-08 | 瑞声声学科技(深圳)有限公司 | Linear vibration motor |
| CN111211661B (en) * | 2020-02-25 | 2021-06-11 | 瑞声光电科技(常州)有限公司 | Linear vibration motor |
| CN111313647B (en) * | 2020-03-02 | 2022-07-05 | 瑞声科技(新加坡)有限公司 | Linear motor |
| CN211981716U (en) * | 2020-04-20 | 2020-11-20 | 瑞声科技（南京）有限公司 | Vibration motor |
| CN111463987B (en) * | 2020-05-11 | 2021-09-14 | 浙江省东阳市东磁诚基电子有限公司 | Multidirectional vibration motor and implementation method thereof |
| CN111641315B (en) * | 2020-06-30 | 2022-01-28 | 歌尔股份有限公司 | Vibration device and electronic apparatus |
| CN111682731A (en) * | 2020-06-30 | 2020-09-18 | 歌尔股份有限公司 | Vibration device and electronic apparatus |
| CN111641322B (en) * | 2020-06-30 | 2022-03-25 | 歌尔股份有限公司 | Vibration device and electronic apparatus |
| WO2022006839A1 (en) * | 2020-07-10 | 2022-01-13 | 瑞声声学科技(深圳)有限公司 | Linear motor |
| WO2022006837A1 (en) * | 2020-07-10 | 2022-01-13 | 瑞声声学科技(深圳)有限公司 | Linear motor |
| CN214281180U (en) * | 2020-12-22 | 2021-09-24 | 瑞声光电科技(常州)有限公司 | Vibration motor |
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| CN113991914B (en) * | 2021-09-30 | 2023-01-24 | 歌尔股份有限公司 | Vibration motor |
| CN113839539B (en) * | 2021-10-25 | 2022-12-20 | 汉得利（常州）电子股份有限公司 | Multi-direction touch actuator |
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