Vibration motor

Abstract

The invention discloses a vibration motor, which comprises a shell, a vibrator vibrating along a first direction, a stator and a metal elastic piece, the stator comprises a coil; the vibrator comprises magnetic steel and two clamping plates; the magnetic steel and the stator are arranged at an interval along the second direction; the two clamping plates are respectively stacked and fixed on two opposite sides of the magnetic steel; the metal elastic piece comprises two flat-plate-shaped elastic pieces which are arranged at intervals in the first direction, the planes where the two elastic pieces are located are parallel to each other and are both perpendicular to the first direction, and each elastic piece is connected with the shell and one clamping plate so that the vibrator can be suspended in the shell. And the elastic sheets and the magnetic steel are arranged at intervals along a third direction. Compared with the prior art, the metal elastic piece of the vibration motor has the advantages that the occupation of the internal vibration space of the vibration motor is reduced under the same structural strength, so that the vibration motor conforms to the miniaturization development trend, and the vibration motor is applied to electronic equipment with smaller installation space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motors, in particular to a vibration motor. BACKGROUND

[0002] The touch key is a key for realizing touch control by sensing a pressing signal, specifically, for realizing accurate detection by sensing the position and force of pressing, so as to achieve the effect of precise control, and is commonly applied to the side key of a mobile phone.

[0003] The touch key mainly comprises a key for force pressing and a vibration motor connected with the key; wherein the vibration motor is a core component, and mainly comprises a shell, a vibrator accommodated in the shell, a stator for driving the vibrator to vibrate, and a metal elastic piece for elastically suspending the vibrator in the shell; the vibrator comprises a magnetic steel, and the stator comprises a coil. The working principle of the touch key is that when the key is pressed, the vibrator will produce displacement in the pressing direction, so as to realize corresponding control by detecting the displacement and the position of the sound-producing displacement.

[0004] The metal elastic piece mainly comprises a first fixed part fixed to the shell, a second fixed part fixed to the vibrator, and an elastic part connected with the first fixed part and the second fixed part and having elastic deformation performance. The elastic part in the related art is in an S shape, a C shape or other bending structure. Such a design will occupy the space of the vibration motor due to the bending part under the condition that the metal elastic piece maintains the same structural strength, so that the volume of the vibration motor is increased, and the vibration motor cannot be applied to electronic devices with small installation space.

[0005] Therefore, it is necessary to provide a new vibration motor to solve the above problems. SUMMARY

[0006] The present application aims to provide a new vibration motor to solve the problem that the vibration motor of the touch key in the related art adopts a metal elastic piece with a bending structure to elastically support the vibrator, so that the volume of the vibration motor is increased under the condition that the metal elastic piece maintains the same structural strength, and the vibration motor cannot be applied to electronic devices with small installation space.

[0007] The present application provides a vibrating motor, which comprises a housing, a vibrator accommodated in the housing, a stator supported on the housing and driving the vibrator to vibrate in a first direction, and a metal elastic piece elastically suspending the vibrator in the housing; the stator comprises a coil fixed to the housing, and the winding axis of the coil is parallel to a second direction, which is perpendicular to the first direction; the vibrator comprises a magnetic steel spaced apart from the stator along the second direction, and two clamping plates respectively stacked and fixed to opposite sides of the magnetic steel along the first direction; the metal elastic piece comprises two elastic pieces in the form of flat plates spaced apart along the first direction, and the planes where the two elastic pieces are located are parallel to each other and perpendicular to the first direction; each of the elastic pieces is connected to the housing and one of the clamping plates to suspend the vibrator in the housing; each of the elastic pieces is spaced apart from the magnetic steel along a third direction, which is perpendicular to the first direction and the second direction.

[0008] Preferably, each of the elastic pieces comprises a first fixed arm fixed to the housing, an elastic arm extending from the first fixed arm towards the vibrator along the third direction and fixed to the corresponding clamping plate, and a second fixed arm and a third fixed arm extending from both ends of the first fixed arm along the second direction and spaced apart from the elastic arm along the third direction, and the second fixed arm and the third fixed arm of each of the elastic pieces are fixed to the housing.

[0009] Preferably, the elastic arm is fixed to the surface of one of the clamping plates facing the other clamping plate.

[0010] Preferably, the metal elastic piece further comprises a connecting arm fixed to the housing; the connecting arm comprises a first connecting portion, a second connecting portion and a third connecting portion, the first connecting portion is fixedly connected to the first fixed arm of the two elastic pieces, the second connecting portion is fixedly connected to the second fixed arm of the two elastic pieces, the third connecting portion is fixedly connected to the third fixed arm of the two elastic pieces, and both ends of the first connecting portion along the second direction are fixedly connected to the second connecting portion and the third connecting portion, respectively.

[0011] Preferably, the housing comprises two side plates spaced apart along the second direction and an end cover connecting the end portions of the two side plates along the third direction, the end cover is in the form of a U-shaped, the end cover comprises a bottom wall fixed with the first fixed arm, and two side walls bent and extended from the bottom wall and spaced apart along the second direction, and the second fixed arm and the third fixed arm are fixed to one of the two side walls, respectively.

[0012] Preferably, the length of the second connecting part in the third direction is less than the length of the second fixed arm, and the length of the third connecting part is less than the length of the third fixed arm.

[0013] Preferably, the stator further comprises an iron core and a pole core, the coil is arranged on the outer circumferential side of the iron core, the pole core comprises a main body part clamped and fixed between the iron core and the side plate, and two bending parts respectively bent and extended from the main body part along the opposite sides of the first direction to the direction close to the vibrator, and the coil is arranged between the two bending parts.

[0014] Preferably, the stator further comprises a baffle arranged on the side close to the vibrator of the coil and spaced from the vibrator, and the baffle is fixed to the side close to the vibrator of the two bending parts of the pole core.

[0015] Preferably, the magnetic steel and the clamping plate are provided with a first avoiding groove recessed in the direction away from the baffle corresponding to the position of the baffle, and the iron core is provided with a second avoiding groove recessed in the direction away from the baffle corresponding to the position of the baffle.

[0016] Preferably, the vibration motor further comprises a flexible circuit board electrically connected with the coil, and the flexible circuit board is fixed to the main body part and extends out of the shell.

[0017] Compared with the related art, the vibration motor of the present application reduces the occupation of the vibration space by designing the elastic sheet into a flat plate and making the plane where the elastic sheet is located perpendicular to the vibration direction of the vibrator, while maintaining the same structural strength, so that the vibration motor conforms to the development trend of miniaturization, so as to make the vibration motor applied to electronic devices with smaller installation space. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings. Figure 1 A perspective view of the vibration motor provided for embodiment one of the present application; Figure 2 A partial structure exploded view of the vibration motor provided for embodiment one of the present application; Figure 3 A sectional view along line A-A in Figure 1 Figure 4 An enlarged view of part B in Figure 1 Figure 5 ​​A perspective view of the vibration motor according to the first embodiment of the present application is shown in Fig. 1. Figure 6 A perspective view of the vibration motor according to the first embodiment of the present application is shown in Fig. 1. Figure 7 A perspective view of the vibration motor according to the first embodiment of the present application is shown in Fig. 1. Figure 6 A sectional view along the line C-C in the vibration motor according to the first embodiment of the present application is shown in Fig. 2. Figure 8 A partial structural exploded view of the vibration motor according to the second embodiment of the present application is shown in Fig. 6. Figure 9 A perspective view of the metal elastic member in the vibration motor according to the second embodiment of the present application is shown in Fig. 7. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0020] Embodiment 1 As shown in Fig. 1, the present embodiment provides a vibration motor 100 applied to a side key of a mobile phone. Figures 1-7 As shown in Fig. 1, the present embodiment provides a vibration motor 100 applied to a side key of a mobile phone. Figure 1 As shown in Fig. 1, the vibration motor 100 comprises a housing 1, a vibrator 3 accommodated in the housing 1, a stator 2 supported on the housing 1 and driving the vibrator 3 to vibrate along a first direction Z, and a metal elastic member 4 elastically suspending the vibrator 3 in the housing 1.

[0021] As shown in Fig. 1, the present embodiment provides a vibration motor 100 applied to a side key of a mobile phone. Figures 2-3 As shown in Fig. 1, the present embodiment provides a vibration motor 100 applied to a side key of a mobile phone.

[0022] As shown in Fig. 1, the present embodiment provides a vibration motor 100 applied to a side key of a mobile phone. Figures 2-4As shown, the stator 2 includes a coil 21 fixed to the side plate 11, an iron core 22, and a pole core 23. The coil 21 is wound around the outer periphery of the iron core 22 along a winding axis parallel to the second direction Y. The pole core 23 includes a main body 231 sandwiched between the iron core 22 and the side plate 11, and two bent portions 232 extending from the main body 231 along opposite sides of the first direction Z toward the vibrator 3. The coil 21 is positioned between the two bent portions 232 to prevent the coil 21 from sliding off the pole core 23 and improve the stability of the coil 21. The main body 231 is sandwiched between the two side walls 122 of the end caps 12 located on the same side. Furthermore, the stator 2 includes a baffle 24 positioned on the side of the coil 21 near the vibrator 3 and spaced from the vibrator 3. The baffle 24 is fixed to the two bent portions 232 of the pole core 23 on the side near the vibrator 3 to further prevent the coil 21 from sliding off the side near the vibrator 3 and improve the stability of the coil 21. In this embodiment, the blocking piece 24 is provided at the middle position of the bent portion 232 along the third direction X. It is understood that the stator 2 includes two stators 2, which are provided on both sides of the vibrator 3 along the second direction Y, and the winding axes of the two coils 21 of the two stators 2 coincide with each other along the second direction.

[0023] The vibrator 3 includes a magnetic steel 31 spaced apart from the stator 2 along the second direction Y and two clamping plates 32 stacked and fixed on opposite sides of the magnetic steel 31 along the first direction Z. In this embodiment, along the third direction X, the lengths of the two clamping plates 32 are the same and both are greater than the length of the magnetic steel 31. Figure 2 The magnet 31 and the clamping plate 32 are provided with a first avoidance groove 33 which is recessed in a direction away from the baffle 24 at a position corresponding to the baffle 24; Figure 5 As shown, the iron core 22 is provided with a second avoidance groove 221 recessed in a direction away from the baffle 24 at a position corresponding to the baffle 24 to prevent the vibrator 3 from colliding with the baffle 24 when vibrating along the first direction Z, thereby ensuring that the vibrator 3 has stable vibration performance.

[0024] like Figures 2-7 As shown, the metal elastic member 4 includes two flat-plate springs 41 spaced apart along a first direction Z. The planes on which the two springs 41 lie are parallel to each other and perpendicular to the first direction Z. Each spring 41 is connected to the bottom wall 121 of the end cap 12 and one of the clamping plates 32 to suspend the vibrator 3 within the housing 1. Each spring 41 is spaced apart from the magnet 31 along a third direction X. Furthermore, each spring 41 is fixed to the surface of one of the corresponding clamping plates 32 that faces the other clamping plate 32.

[0025] like Figures 4-7As shown, further, each elastic sheet 41 includes a first fixed arm 411 fixed to the bottom wall 121, an elastic arm 412 extending from the first fixed arm 411 toward the vibrator 3 along the third direction X and fixed to the clamping plate 32 corresponding thereto, and a second fixed arm 413 and a third fixed arm 414 extending from the first fixed arm 411 along the two ends of the second direction Y respectively along the third direction X and spaced apart from the elastic arm 412 in parallel, the second fixed arm 413 and the third fixed arm 414 of each elastic sheet 41 being fixed to the shell 1 respectively; specifically, the second fixed arm 413 and the third fixed arm 414 are fixed to one of the two side walls 122 of the same end cover 12 respectively. The elastic arm 412 is fixed to the surface of the clamping plate 32 corresponding thereto facing the other clamping plate 32, so as to arrange the elastic sheet 41 between the two clamping plates 32, avoiding occupying the vibration space of the vibrator 3.

[0026] The vibration motor 100 further includes a flexible circuit board 5 electrically connected with the coil 21; wherein the flexible circuit board 5 is fixed to the side of the main body part 231 close to the coil 21 and extends to the outside of the end cover 12 to be electrically connected with the external circuit. It can be understood that the flexible circuit board 5 includes two, respectively electrically connected with the coil 21 in one stator 2 to realize power supply.

[0027] Compared with the related art, the vibration motor of the embodiment can reduce the occupation of the vibration space of the vibrator in the vibration motor while keeping the same structural strength of the metal elastic member, i.e. without increasing the volume of the vibration motor, to meet the development trend of miniaturization, so as to apply the vibration motor to electronic devices with smaller installation space.

[0028] Embodiment two Different from embodiment one, in combination with Figures 8-9 As shown, the metal elastic member 4 further includes a connecting arm 42 fixed to the end cover 12, the connecting arm 42 connecting the two elastic sheets 41 into one body; the connecting arm 42 includes a first connecting part 421, a second connecting part 422 and a third connecting part 423, the first connecting part 421 being fixedly connected to the first fixed arms 411 of the two elastic sheets 41, the second connecting part 422 being fixedly connected to the two second fixed arms 413 of the two elastic sheets 41, and the third connecting part 423 being fixedly connected to the two third fixed arms 414 of the two elastic sheets 41, the two ends of the first connecting part 421 along the second direction Y being fixedly connected to the second connecting part 422 and the third connecting part 423 respectively. By designing the connecting arm 42, the structural strength of the metal elastic member 4 is improved, and the vibrator 3 has stable vibration performance.

[0029] In the present embodiment, along the third direction X, the lengths of the second fixed arm 413 and the third fixed arm 414 are less than the length of the elastic arm 412.

[0030] The above merely describes the embodiments of the present application, and it should be pointed out that, for those skilled in the art, improvements can be made without departing from the inventive concept, and these all belong to the protection scope of the present application.

Claims

1. A vibration motor comprising a housing, a vibrator housed in the housing, a stator supported to the housing and driving the vibrator to vibrate in a first direction, and a metal elastic member elastically suspending the vibrator in the housing, characterized in that, The stator comprises coils fixed to the shell, winding axes of the coils being parallel to a second direction, the second direction being perpendicular to the first direction; the vibrator comprises magnetic steels arranged in the second direction away from the stator, and two clamping plates respectively arranged on opposite sides of the magnetic steels in the first direction; the metal elastic member comprises two flat elastic sheets arranged in the first direction, planes of the two elastic sheets being parallel to each other and perpendicular to the first direction, each of the elastic sheets being connected to the shell and one of the clamping plates to suspend the vibrator in the shell, each of the elastic sheets being arranged away from the magnetic steels in a third direction, the third direction being perpendicular to the first direction and the second direction.

2. The vibrating motor of claim 1, wherein Each of the elastic sheets comprises a first fixed arm fixed to the shell, an elastic arm extending from the first fixed arm toward the vibrator in the third direction and fixed to the corresponding clamping plate, and a second fixed arm and a third fixed arm extending from both ends of the first fixed arm in the second direction in the third direction and spaced apart from the elastic arm, the second fixed arm and the third fixed arm of each of the elastic sheets being fixed to the shell.

3. The vibrating motor of claim 2, wherein The elastic arm is fixed to a surface of one of the clamping plates facing the other clamping plate.

4. The vibrating motor of claim 3, wherein The metal elastic member further comprises a connecting arm fixed to the shell; the connecting arm comprises a first connecting portion, a second connecting portion and a third connecting portion, the first connecting portion being fixedly connected to the first fixed arms of the two elastic sheets, the second connecting portion being fixedly connected to the second fixed arms of the two elastic sheets, and the third connecting portion being fixedly connected to the third fixed arms of the two elastic sheets, both ends of the first connecting portion in the second direction being fixedly connected to the second connecting portion and the third connecting portion, respectively.

5. The vibrating motor of claim 4, wherein the rotor is a cylindrical rotor. The shell comprises two side plates arranged opposite to each other in the second direction, and an end cover connecting end portions of the two side plates in the third direction, the end cover being U-shaped, the end cover comprising a bottom wall fixed to the first fixed arms, and two side walls bent from the bottom wall and arranged away from each other in the second direction, the second fixed arms and the third fixed arms being fixed to one of the two side walls, respectively.

6. The vibrating motor of claim 4, wherein In the third direction, the length of the second connecting portion is less than the length of the second fixed arms, and the length of the third connecting portion is less than the length of the third fixed arms.

7. The vibrating motor of claim 5, wherein The stator further comprises a core and a pole core, the coils being arranged on an outer circumferential side of the core, the pole core comprising a main body portion clamped and fixed between the core and the side plates, and two bent portions bent and extended from opposite sides of the main body portion in the first direction toward the vibrator, the coils being arranged between the two bent portions.

8. The vibrating motor of claim 7, wherein The stator further comprises a baffle arranged on a side of the coils close to the vibrator and spaced apart from the vibrator, the baffle being fixed to a side of the two bent portions of the pole core close to the vibrator.

9. The vibration motor according to claim 8, wherein The magnetic steel and the clamping plate are provided with a first avoiding groove recessed in a direction away from the baffle plate at a position corresponding to the baffle plate, and the iron core is provided with a second avoiding groove recessed in a direction away from the baffle plate at a position corresponding to the baffle plate.

10. The vibrating motor of claim 7, wherein The vibration motor further comprises a flexible circuit board electrically connected with the coil, the flexible circuit board being fixed to the main body portion and extending out of the housing.

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