阅读说明：本技术 一种宽频振动马达及电子设备 (Broadband vibration motor and electronic equipment ) 是由 陈娟 曹洪斌 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种宽频振动马达及电子设备,该宽频振动马达包括：外壳,包括内腔(10)；磁性件(3),活动设于所述内腔(10)内,所述磁性件(3)包括至少两个磁体部(30)和位于相邻两个所述磁体部(30)之间的无磁部(31)；线圈(2),用于驱动所述磁性件(3)振动,所述线圈(2)与所述外壳相连,并环绕于所述磁性件(3)外部；以及复位件(4),复位件(4)优选为磁铁,用于驱动所述磁性件(3)复位。本发明的宽频振动马达中,磁性件为一体式的零件,其装配更为方便,且尺寸精度更高,在与宽频振动马达的其他零部件连接时,装配精度也更高,线性马达的性能和使用可靠性也更好。(The invention discloses a broadband vibration motor and electronic equipment, the broadband vibration motor includes: a housing comprising an inner cavity (10); the magnetic part (3) is movably arranged in the inner cavity (10), and the magnetic part (3) comprises at least two magnet parts (30) and a non-magnetic part (31) positioned between every two adjacent magnet parts (30); the coil (2) is used for driving the magnetic part (3) to vibrate, and the coil (2) is connected with the shell and surrounds the outside of the magnetic part (3); and the resetting piece (4), preferably a magnet, is used for driving the magnetic piece (3) to reset. In the broadband vibration motor, the magnetic part is an integrated part, so that the broadband vibration motor is more convenient to assemble and higher in dimensional accuracy, and when the broadband vibration motor is connected with other parts of the broadband vibration motor, the assembly accuracy is higher, and the performance and the use reliability of the linear motor are better.)

1. A broadband vibration motor, comprising:

a housing comprising an inner cavity (10);

the magnetic part (3) is movably arranged in the inner cavity (10), and the magnetic part (3) comprises at least two magnet parts (30) and a non-magnetic part (31) positioned between every two adjacent magnet parts (30);

the coil (2) is used for driving the magnetic part (3) to vibrate, and the coil (2) is connected with the shell and surrounds the outside of the magnetic part (3); and

the resetting piece (4) is used for driving the magnetic piece (3) to reset.

2. The broadband vibration motor according to claim 1, wherein the magnetic poles of the magnet portions (30) and the non-magnetic portions (31) are arranged along the vibration axis of the magnetic member (3), and the polarities of the adjacent two magnetic poles of the adjacent two magnet portions (30) are the same.

3. The broadband vibration motor according to claim 1, wherein the coil (2) is disposed around the periphery of the non-magnetic portion (31), and the thickness of the coil (2) is greater than or equal to the thickness of the non-magnetic portion (31).

4. The broadband vibration motor according to claim 1, further comprising a guide sleeve (6) fixed opposite to the housing, wherein the guide sleeve (6) is provided with a guide hole (60), and the magnetic member (3) is slidably fitted in the guide hole (60).

5. The broadband vibration motor according to claim 4, wherein a lubricating oil is filled between the magnetic member (3) and the guide sleeve (6).

6. The broadband vibration motor of claim 5, wherein the kinematic viscosity of the lubricating oil at-15 ℃ is 680-900mm²(S) kinematic viscosity at 23 ℃ of 60 to 65.5mm²S, kinematic viscosity at 40 ℃ of 30 to 35mm²/S。

7. The broadband vibration motor of claim 1, wherein the coil (2) is disposed within the inner cavity (10) or around the outside of the housing.

8. The broadband vibration motor according to any one of claims 1 to 7, wherein the reset member (4) is a magnet, at least one reset member (4) is correspondingly disposed at each of two ends of the magnetic member (3) in the vibration direction, and the reset member (4) drives the magnetic member (3) to reset by a repulsive force with the magnetic member (3).

9. The broadband vibration motor of claim 8, wherein the housing further comprises end caps (5) sealing both ends of the inner cavity (10), and the reset member (4) is connected to the end caps (5).

10. An electronic device comprising the broadband vibration motor of any one of claims 1 to 10.

Technical Field

The invention relates to the technical field of vibration motors, in particular to a broadband vibration motor and electronic equipment.

Background

The broadband vibration motor is widely applied to electronic products such as mobile phones, tablet computers, wearable equipment and navigators, and can generate feedback for users through vibration of the broadband vibration motor, for example, vibration feedback is generated when a screen of a mobile phone is touched for dialing, so that people can perceive the feedback, and the electronic equipment is convenient to use by people.

The existing broadband vibration motor generally comprises a shell, and a vibrator, a coil, a reset elastic sheet and the like which are all arranged in the shell. The vibrator is generally formed by connecting a plurality of magnets, and two adjacent magnets are connected through a magnetizer. The coil can drive the oscillator after the circular telegram and vibrate along the vibration axis, and the shell fragment that resets sets up the both ends at the casing, and is located the both sides of oscillator vibration axis respectively, and the shell fragment that resets is connected between oscillator and casing, can reset through the elasticity drive oscillator between with the oscillator.

At present, the broadband vibration motor has the following defects: firstly, in order to improve the magnetic force of the oscillator, the oscillator is arranged to comprise a plurality of magnets, and two adjacent magnets are separated by a magnetizer, so that the number of parts is increased, the assembly is more difficult, the assembly precision is poor, the oscillator is easy to contact with a coil during vibration, and the use reliability of the broadband vibration motor is influenced; second, two adjacent magnets of wide band vibrating motor need homopolar relative setting, because the existence of homopolar repulsion, lead to the oscillator to hardly assemble, the assembly is accomplished the back precision and is difficult to guarantee, in addition, for the convenience of the connection of magnet, the thickness of magnetizer can not the undersize, lead to the volume increase of oscillator or with available magnet volume under the volume to diminish, and then lead to wide band vibrating motor's volume to be difficult to further reduce or the vibration volume is difficult to promote.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

Disclosure of Invention

The invention aims to provide a broadband vibration motor and an electronic device, wherein the broadband vibration motor is more convenient to assemble and easy to ensure the assembly precision.

To achieve the above object, in one aspect, the present invention provides a broadband vibration motor, including:

a housing including an interior cavity;

the magnetic part is movably arranged in the inner cavity and comprises at least two magnetic parts and a non-magnetic part positioned between every two adjacent magnetic parts;

the coil is used for driving the magnetic part to vibrate, is connected with the shell and surrounds the outside of the magnetic part; and

the resetting piece is used for driving the magnetic piece to reset.

Further, the magnetic poles of the magnet parts and the non-magnetic parts are arranged along the vibration axis of the magnetic part, and the polarities of the two adjacent magnetic poles of the two adjacent magnet parts are the same.

Further, the coil encircles and sets up in the periphery of no magnetism portion, the thickness of coil more than or equal to the thickness of no magnetism portion.

Further, the broadband vibration motor further comprises a guide sleeve fixed relative to the shell, the guide sleeve is provided with a guide hole, and the magnetic part is connected in the guide hole in a sliding fit mode.

Further, lubricating oil is filled between the magnetic part and the guide sleeve.

Further, the kinematic viscosity of the lubricating oil at-15 ℃ is 680-900mm²(S) kinematic viscosity at 23 ℃ of 60 to 65.5mm²S, kinematic viscosity at 40 ℃ of 30 to 35mm²/S。

Further, the coil is arranged in the inner cavity or wound outside the shell.

Further, the piece that resets is magnet, the both ends of magnetic part vibration direction all correspond and are provided with at least one the piece that resets, reset the piece through with repulsion drive between the magnetic part resets.

Further, the shell further comprises end covers for sealing two ends of the inner cavity, and the resetting piece is connected with the end covers.

In another aspect, the present invention further provides an electronic device including the broadband vibration motor as described in any one of the above.

Compared with the prior art, the invention has the following beneficial effects:

1. in the invention, the magnetic part is an integrated part formed by magnetizing, the processing precision is easier to ensure through the traditional processing technology, compared with the vibrator formed by connecting a plurality of magnets and magnetizers, the step of assembling the vibrator is omitted, the assembly is more convenient, the size precision is higher, the assembly precision is higher when the vibrator is connected with other parts of the broadband vibration motor, and the use reliability of the linear motor is better.

2. In the invention, the thickness of the non-magnetic part can be smaller than that of the magnetizer of the transmission vibrator, and correspondingly, the thickness of the magnetic part can be larger, thereby improving the magnetic force of the magnetic part, reducing the volume of the magnetic part and facilitating the miniaturization of the broadband vibration motor.

Drawings

Fig. 1 is a schematic structural diagram of a broadband vibration motor according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a housing according to an embodiment of the present invention.

Fig. 3 is a schematic view showing the positions of the magnetic member, the coil and the reset member of fig. 1.

Fig. 4 is a schematic structural view of a guide sleeve according to an embodiment of the present invention.

Fig. 5 is a schematic view of a magnetic member according to an embodiment of the present invention.

Fig. 6 is a schematic view of a magnetic member according to an embodiment of the present invention, in which a magnet portion and a non-magnetic portion of the magnetic member are not symmetrical with respect to a geometric symmetry plane.

Fig. 7 is a schematic view of a magnetizing method for magnetizing a magnetic member according to the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. 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 application.

The terms "comprising" and "having," as well as any variations thereof, in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As shown in fig. 1 to 7, the broadband vibration motor of the present invention includes a housing, a coil 2 connected to the housing, a magnetic member 3 movably coupled in the housing, and a reset member 4 for resetting the magnetic member 3.

The housing comprises a housing 1, the housing 1 is tubular and has an inner cavity 10, the outer contour shape of the housing 1 is not limited, for example, the housing can be circular or rectangular, the cross-sectional shape of the inner cavity 10 formed by the housing 1 is also not limited, for example, the housing 1 with the rectangular outer contour shape can be provided with the circular inner cavity 10, and preferably, the cross-sectional shape of the inner cavity 10 is consistent with the outer contour shape of the housing 1. The housing 1 may be one piece integrally formed, or may be formed by connecting a plurality of pieces. In the present embodiment, referring to fig. 2, the housing 1 has a square tube shape, and has an inner cavity 10, and the cross section of the inner cavity 10 is rectangular. The housing 1 is formed by connecting a plurality of parts, and specifically, the housing 1 includes a frame 11 and a cover plate 12, the frame 11 is substantially U-shaped and has an open end, and the cover plate 12 is connected to the open end and seals the open end, so that the whole body (i.e., the housing 1) after the frame 11 and the cover plate 12 are connected is in a square tube shape.

The coil 2 is fixedly connected with the housing 1 in an unlimited manner, and may be, for example, glued, bolted, or directly wound outside the casing. The coil 2 is connected to an external control system which is capable of controlling one or more of the parameters of magnitude, direction and frequency of the current and voltage passed to the coil 2, thereby controlling the magnitude and direction of the magnetic field generated by the coil 2. The magnetic member 3 is inserted into the coil 2, and can vibrate back and forth along the vibration axis when receiving the acting force of the magnetic field generated by the coil 2. The coil 2 may be installed inside the housing 1 or outside the housing 1 as long as the magnetic force generated by the coil can drive the magnetic member 3 to vibrate. In this embodiment, the coil 2 is fixedly connected inside the casing 1, and specifically, the coil 2 is fixedly connected on the inner wall of the casing 1. The broadband vibration motor further comprises a flexible circuit board 13 connected to the cover plate 12, one end of the flexible circuit board 13 is located in the shell 1 and is electrically connected with the outgoing line of the coil 2, and the other end of the flexible circuit board 13 extends to the outside of the shell 1 so as to be connected with an external control system. In this embodiment, the number of the coils 2 is two, and the coils are respectively disposed on two sides of the flexible circuit board 13.

The magnetic element 3 is movably coupled in the housing 1 and is capable of oscillating back and forth along an oscillation axis, preferably, the axis of the housing 1 coincides with the oscillation axis, and further preferably, the axis of the magnetic element 3 also coincides with the oscillation axis. The reset pieces 4 are used for driving the magnetic pieces 3 to reset, the number of the reset pieces is at least two, and the reset pieces are respectively positioned at two ends of the magnetic pieces 3 in the vibration axis direction. The restoring member 4 may be, for example, a magnet or an elastic member (e.g., a spring or a leaf spring), and the restoring member 4 generates a force for restoring the magnetic member 3 by a magnetic force or an elastic force, but of course, the restoring member 4 is not limited to a magnet or a spring or a leaf spring, and the restoring force generated by the restoring member is not limited to a magnetic force or an elastic force. Because the both sides of magnetic member 3 moving direction all are provided with the piece 4 that resets, the piece 4 that resets of both sides all can exert certain effort to magnetic member 3 to make magnetic member 3 automatic get back to the normal position, it is obvious that the normal position is the position when magnetic member 3 is in stress balance. The magnetic element 3 is able to respond more sensitively and quickly after receiving the driving force of the coil 2 and to return to its original position under the restoring force of the restoring element 4 after the driving force is lost.

As a preferred embodiment, in the present embodiment, the reset element 4 is a magnet, and at least one reset element 4 is correspondingly disposed at both ends of the magnetic element 3 in the vibration direction. Preferably, the reset pieces 4 are connected to the end covers 5, each end cover 5 is provided with one reset piece 4, and the reset pieces 4 on the two end covers 5 drive the magnetic pieces 3 to reset through magnetic force. The magnetic member 3 includes at least two magnet portions 30 and a non-magnetic portion 31 located between adjacent two magnet portions 30. The two reset pieces 4 apply opposite force to the ends of the magnetic pieces 3 adjacent to the reset pieces so that the magnetic pieces 3 are not biased to one side. In this embodiment, referring to fig. 3, the magnetic member 3 includes three magnetic portions 30 and two non-magnetic portions 31, two adjacent magnetic poles of the reset member 4 and the magnetic member 3 on the left side are both N poles, two adjacent magnetic poles of the reset member 4 and the magnetic member 3 on the right side are both S poles, and the two reset members 4 both apply a repulsive force to the magnetic member 3 to drive the magnetic member 3 to reset. The magnetic part 3 is driven to reset by the magnetic force of the magnet, so that the defects of performance reduction or fatigue fracture and the like of the elastic part due to long-term use can be effectively avoided.

In order to enable the magnetic member 3 to vibrate along the vibration axis direction with higher precision, the broadband vibration motor further comprises a guide sleeve 6 sleeved outside the magnetic member 3, and the guide sleeve 6 is fixed relative to the housing 1, and the number of the guide sleeve 6 is not limited to one. The magnetic member 3 is slidably fitted in the guide hole 60 of the guide sleeve 6, and obviously, by improving the dimensional accuracy of the guide hole 60, the fitting accuracy with the magnetic member 3 can be improved, so that the magnetic member 3 can be better guided to vibrate. The guide sleeve 6 may be a separate component connected to the housing 1 or may be a part of the housing 1 protruding into the inner cavity 10.

Preferably, as shown in fig. 1 and 3, in this embodiment, the guiding sleeve 6 is a separate component, which is disposed in the inner cavity 10 and is fixedly connected to the inner wall of the housing 1. The number of the guide sleeves 6 is two, and the guide sleeves 6 are respectively sleeved on two ends of the magnetic member 3, but of course, in other embodiments, the number of the guide sleeves 6 may also be three or more. In order to improve the position accuracy of the guide sleeve 6, as shown in fig. 2 and 4, the guide sleeve 6 is provided with a convex positioning boss 61, the housing 1 is provided with a positioning hole 14 matched with the positioning boss 61, the position accuracy of the guide sleeve 6 in the housing 1 can be improved through the matching of the positioning hole 14 and the positioning boss 61, the connection strength of the guide sleeve 6 and the housing 1 is improved, the guide sleeve 6 is prevented from loosening and shifting in the vibration process of the magnetic part 1, and the reliable operation of the broadband vibration motor is further ensured.

As a preferred embodiment, lubricating oil is sprayed or smeared on the outer peripheral surface of the magnetic member 3, and the lubricating oil is filled between the magnetic member 3 and the inner wall of the guide sleeve 6, so that the magnetic member 3 moves in a thin film formed by the lubricating oil, thereby adjusting the damping received during the operation of the magnetic member, increasing the corresponding frequency bandwidth of the magnetic member, improving the broadband performance of the broadband vibration motor, and having better use experience when the broadband vibration motor is mounted on products such as mobile phones and game pads. The lubricating oil is preferably mixed lubricating oil, and the damping received by the magnetic member 3 can be adjusted by changing the type of the filled lubricating oil.

As a preferred embodiment, the lubricating oil has a kinematic viscosity at-15 ℃ of 680-900mm²(S) kinematic viscosity at 23 ℃ of 60 to 65.5mm²S, kinematic viscosity at 40 ℃ of 30 to 35mm²and/S. It is further preferred that the lubricating oil has a solids content of 99-99.5 wt.% after standing at 100 ℃ and 110 ℃ for 3.5-4.5 h. It is further preferred that the preparation stock comprises at least 90-99 parts by weight of mineral oil, based on parts by weight of the preparation stock. Further preferably, the mineral oil is a hydrocarbon selected from one or more of a linear hydrocarbon, a branched hydrocarbon, a substituted or unsubstituted cycloalkane, or an aromatic hydrocarbon. Further preferably, the lubricating oil further comprises an organometallic compound having a friction coefficient of 0.04 to 0.12. Further preferably, the organometallic compound is an organozinc compound and/or an organomolybdenum compound. Further preferably, the organic molybdenum compound is selected from one or more of molybdenum dialkyl dithiophosphate, oxygen molybdenum dialkyl dithiophosphate containing nitrogen, molybdenum dialkyl dithiocarbamate, molybdenum amine complex, molybdenum naphthenate or molybdenum alkyl salicylate. Further preferably, the lubricating oil further comprises organic acid esters, and the weight ratio of the organic acid esters to the mineral oil is 1: (60-100). It is further preferred that the viscosity of the organic acid esters at 100 ℃ is < 1500mm²/S。

The lubricating oil is used as a vibration conduction medium of the magnetic part 3, so that the lubricating damping performance can be improved, the lubricating damping effect is stable, no noise exists, the reliability is high, particularly, the lubricating oil has excellent lubricating damping effect under certain viscosity at a certain temperature, the interaction force generated when the lubricating regulator slides between the lubricating regulator and the inner wall is in a stable state, and no sudden change force is generated in the moving process of the magnetic part 3, so that the lubricating damping effect is stable, no noise is generated, and a stable broadband vibration effect is achieved.

The shell further comprises end covers 5 connected to two ends of the shell 1, the end covers 5 are used for sealing two ends of the inner cavity 10, the inner cavity 10 of the shell 1 is in a closed state, external foreign matters are prevented from entering the inner cavity 10, and reliable operation of the broadband vibration motor is facilitated.

In the present invention, the magnetic member 3 is formed by integrally magnetizing a magnetic material, such as ferrite, neodymium iron boron, alnico, and samarium cobalt. As shown in fig. 5 and 6, the magnetic member 3 includes at least two magnet portions 30 and a non-magnetic portion 31 between two adjacent magnet portions 30, and it is understood that the magnet portions 30 and the non-magnetic portion 31 are part of the magnetic member 3 and are not separate components. Each magnet part 30 comprises two magnetic poles which are respectively an N pole and an S pole, and the polarities of the two adjacent magnetic poles of the two adjacent magnet parts 30 are the same, so that magnetic lines of force can concentrate to approximately vertically penetrate through the coil 2, and after the coil 2 is electrified, a larger driving force can be generated, and the driving force and the sensitivity of the broadband vibration motor are improved. The plurality of magnet portions 30 are disposed along the vibration axis of the magnetic member 3, and the non-magnetic portion 31 separates two adjacent magnet portions 30, that is, the magnetic poles of the magnet portions 30 and the non-magnetic portion 31 are both disposed along the vibration axis of the magnetic member 3.

As a preferred embodiment, as shown in fig. 3, the coil 2 is located corresponding to the non-magnetic portion 31, that is, the coil 2 is disposed around the periphery of the non-magnetic portion 31. Preferably, the two coils 2 are symmetrically arranged on the magnetic member 3 to make the force application more symmetrical. The thickness H of the coil 2 may be the same as the thickness D of the nonmagnetic portion 31, or may be larger than the thickness D of the nonmagnetic portion 31. Preferably, the thickness H of the coil 2 is greater than the thickness D of the non-magnetic portion 31, so that the magnetic lines of force derived from the non-magnetic portion 31 can pass through the coil 2, thereby generating the maximum possible lorentz force to drive, so that the response of the magnetic member 3 is more sensitive, and preferably, the coil 2 is symmetrically arranged on the non-magnetic portion 31, and the widths B of the areas of the two magnetic portions 30 covered by the coil 2 are the same, so that the symmetry is better.

The magnetic member 3 includes at least one nonmagnetic portion 31 and two magnet portions 30, of course, the number thereof is not limited thereto, and for example, as shown in fig. 3, it may have two nonmagnetic portions 31 and three magnet portions 30, and so on for the case where there are more nonmagnetic portions 31. In the case where there are a plurality of nonmagnetic portions 31, the thicknesses of the plurality of nonmagnetic portions 31 may be the same or different. In a preferred embodiment, the thickness of the non-magnetic portion 31 is more than 0.3mm, and the maximum value is smaller than the minimum value of the thickness of any one of the magnet portions 10, if the thickness of the non-magnetic portion 31 is too small, the boundary between the magnet portion 30 and the non-magnetic portion 31 is not clear, and the performance of the magnetic member 3 is affected, and if the thickness of the non-magnetic portion 31 is too large, the magnet portion 30 is correspondingly small, and the magnetic flux and the value B are affected.

The cross-sectional shape of the magnetic member 3 is not limited, and for example, the cross-sectional shape may be triangular, circular, rectangular, etc., and preferably, the shape of the guide hole 60 of the guide sleeve 6 is consistent with the outer contour of the magnetic member 3 to ensure the guiding precision. The magnet part 30 and the non-magnetic part 31 formed on the magnetic member 3 may be symmetrical or asymmetrical with respect to the geometric symmetry plane 32 of the magnetic member 3, as shown in fig. 6 in a case of asymmetry.

The magnetic member 3 may be formed by magnetizing, for convenience of description, the magnetic member 3 to be magnetized is referred to as a to-be-magnetized member 3a, the to-be-magnetized member 3a becomes the magnetic member 3 after being magnetized, and the to-be-magnetized magnetic member 3 may be, for example, a non-magnetic blank or a magnetic member 3 which needs to be magnetized again after the magnetism is weakened. As shown in fig. 7, the to-be-magnetized member 3a (an object shown by a dotted line in the figure) is inserted into the flux sleeve 7 and the polyurethane sleeve 70, the position of the polyurethane sleeve 70 corresponds to the position that needs to be magnetized, i.e., the magnet portion 30, and the flux sleeve 7 is disposed at the position that does not need to be magnetized, i.e., is sleeved on the position corresponding to the non-magnetic portion 31. The polyurethane sleeve 70 may extend beyond the end of the member to be magnetized 3a, and a magnetic block 73 for sealing the polyurethane sleeve 70 may be disposed at the end of the polyurethane sleeve 70 to enhance the magnetizing effect. Then, the to-be-magnetized piece 3a is placed between a plurality of magnetizing coils, in the figure, two groups of magnetizing coils, namely a first coil group 71 and a second coil group 72, which are respectively arranged at corresponding positions of the two polyurethane sleeves 70 are shown, and the first coil group 71 and the second coil group 72 both include one or more magnetizing coils. The current directions of the magnetizing coils in each coil group are the same, and the polarity of the magnetized magnet portion 30 can be changed by changing the current directions, for example, when the current directions of the first coil group 71 and the second coil group 72 are opposite, the first coil group 71 and the second coil group 72 generate magnetic fields with opposite polarities. The magnetic fields generated by the magnetizing coils are opposite in direction, and the polarities of the two adjacent magnet parts 31 formed by magnetizing the magnetizing coils are also opposite. The magnetic conductive sleeve 7 is made of a high-permeability material such as a silicon steel sheet, and can lead out and conduct magnetic lines of force of an electromagnetic field generated by the coil assembly, so that a region for shielding the magnetic field is formed in the magnetic conductive sleeve 7, the polyurethane sleeve 70 can allow the magnetic lines of force of the magnetic field to pass through, therefore, the part 3a to be magnetized is only magnetized at a position corresponding to the polyurethane sleeve 70 to form the magnet part 30, the position corresponding to the magnetic conductive sleeve 7 cannot be magnetized to form the non-magnetic part 31, and finally, the part 3a to be magnetized forms the magnetic part 3 shown in fig. 5, obviously, the polarity of the magnet part 30 can be changed by changing the current direction in the coil.

Obviously, because magnetic part 3 is the single spare part that magnetizes the formation, compare in the mode that adopts a plurality of magnet to link to each other, it has higher dimensional accuracy to further improve the assembly precision of magnetic part 3 in uide bushing 6, be difficult for colliding with parts such as uide bushing 6, coil 2 when making magnetic part 3 vibrate, guaranteed reliability and the stationarity of operation, avoid assembly error to lead to the loss of magnetic circuit simultaneously. Further, the gap between the magnetic member 3 and the coil 2 can be made smaller, thereby improving the driving force of the coil 2 to the magnetic member 3. In addition, when a plurality of magnets are connected, the magnets are connected into a mode that the homopolar poles of the two magnets are close to each other, due to the existence of repulsive force, the connection difficulty is very high, the size precision of the connected magnets is further reduced, the magnetic part 3 is manufactured in a magnetizing mode, the processing is more convenient, the accessory cost and the labor cost in the assembling process can be reduced, and the production efficiency is improved.

Further, the transition between each magnet portion 30 and the non-magnet portion 31 of the magnetic member 3 is smooth, so that the surface magnetic field of the magnetic member 3 forms a relatively complete sine wave state distribution.

The invention also provides an electronic device which comprises the broadband vibration motor and can generate vibration feedback in the process of human-computer interaction. The electronic device may be, for example, a cell phone, a tablet, a wearable device, a navigator, a smart hardware device, a gamepad, a VR device, and so on.

The invention has the following advantages:

1. in the invention, the magnetic part is an integrated part formed by magnetizing, the processing precision is easier to ensure through the traditional processing technology, compared with the vibrator formed by connecting a plurality of magnets and magnetizers, the step of assembling the vibrator is omitted, the assembly is more convenient, the size precision is higher, when the vibrator is connected with other parts of the broadband vibration motor, the assembly precision is higher, and the performance and the use reliability of the linear motor are also better.

2. In the invention, the thickness of the non-magnetic part can be smaller than that of the magnetizer of the transmission vibrator, and correspondingly, the thickness of the magnetic part can be larger, thereby improving the magnetic force of the magnetic part, reducing the volume of the magnetic part and facilitating the miniaturization of the broadband vibration motor.

3. The broadband vibration motor has the advantages of wide frequency band, fast response, strong vibration sense and the like, and can provide abundant tactile experience for users when being installed on an electronic product, for example, when being applied to VR equipment, the broadband vibration motor can simulate tactile output of various scenes more accurately, so that the users can experience better immersion, fine and rich tactile interaction.

The above is only one embodiment of the present invention, and any other modifications based on the concept of the present invention are considered as the protection scope of the present invention.