CN111431371A

CN111431371A - Flat vibration motor and manufacturing method thereof

Info

Publication number: CN111431371A
Application number: CN202010356189.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Sichuan Awa Seimitsu Electric Co ltd
Current assignee: Sichuan Awa Seimitsu Electric Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-07-17

Abstract

The invention belongs to the technical field of miniature vibration motors, and particularly relates to a flat vibration motor and a manufacturing method thereof, wherein the flat vibration motor comprises an upper shell and a lower shell, the upper shell and the lower shell are buckled to form an accommodating space, a stator assembly and a rotor assembly are arranged in the accommodating space, the stator assembly comprises a flexible circuit board and a coil, the rotor assembly comprises an elastic piece, a magnet and a plastic package piece, bosses are respectively arranged at the central positions of the upper shell and the lower shell towards the accommodating space, grooves are formed in the middles of the bosses, the rotor assembly is fixed in the accommodating space through the matching of the elastic piece and the grooves of the upper shell and the lower shell, the number of the magnets corresponds to the number of the coils, the invention drives the rotor to swing by changing the current direction of a stator coil, and realizes motor resonance by combining the inherent resilience force of the elastic piece, and the flat, The starting response is fast and the vibration sense is strong.

Description

Flat vibration motor and manufacturing method thereof

Technical Field

The invention belongs to the technical field of miniature vibration motors, and particularly relates to a flat vibration motor and a manufacturing method thereof.

Background

With the development of communication technology, more and more electronic products enter people's lives, especially portable consumer electronic products, such as mobile phones, handheld game consoles or handheld multimedia entertainment devices, and in these portable consumer electronic products, a miniature vibration motor is generally used for vibration feedback, such as incoming call prompt of mobile phones, vibration feedback of game consoles, and the like.

The conventional flat motor mostly adopts a brush contact type to change the current direction, which results in short service life, low reliability and high risk of spark generation, while the flat vibration motor does not have the defect of spark generation due to commutation, and the brushless flat vibration motor is gradually adopted by more and more electronic products instead of the brush flat motor.

Disclosure of Invention

The invention aims to provide a flat vibration motor with long service life, high reliability and quick start response and a manufacturing method thereof.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

the utility model provides a flat vibrating motor, flat vibrating motor includes upper housing and lower casing, and upper housing and lower casing lock form accommodation space, be equipped with stator module and rotor subassembly in the accommodation space, stator module includes flexible circuit board and coil, the rotor subassembly includes elastic component, magnet and plastic-sealed piece, and the central point of upper housing and lower casing puts respectively to accommodation space sets up the boss, sets up the recess in the middle of the boss, and the rotor subassembly passes through the cooperation of elastic component and the recess of upper housing and lower casing to be fixed in accommodation space, and the quantity of magnet corresponds the setting with the quantity of coil.

Furthermore, the elastic part comprises an upper end, a middle part and a lower end, the upper end of the elastic part is inserted into the groove of the upper casing, the lower end of the elastic part is inserted into the groove of the lower casing, the middle part of the elastic part is fixedly combined with the plastic package part, and the length of the lower end of the elastic part is greater than that of the upper end of the elastic part.

Furthermore, the diameters of the two ends of the plastic package part are larger than that of the middle part, the two ends are oval, a first through hole is formed in the center of the middle part, the two oval ends are symmetrically arranged through the first through hole, magnets are arranged in the two ends of the plastic package part, and the middle part of the elastic part is arranged in the first through hole of the plastic package part.

Furthermore, the plastic package part is provided with a magnetic conductive sheet facing to the surface of one side of the stator assembly in a laminating manner, the shape of the magnetic conductive sheet is arranged corresponding to the plastic package part, the middle part of the magnetic conductive sheet is provided with a second through hole, blind grooves are arranged at the two ends of the magnetic conductive sheet, the blind grooves fix the magnet, and the stator assembly is arranged at the other side of the magnetic conductive sheet at intervals.

Furthermore, the upper casing is cylindrical with an opening at one end, a first boss is arranged at the center of the inner surface of the top wall of the upper casing, a first groove is formed in the first boss, a notch is formed in the edge of the opening end of the upper casing, and a first mark position is arranged at the position, corresponding to the edge of the outer surface of the top wall of the upper casing, of the notch.

Furthermore, the lower casing is in a circular plate shape, a second boss is arranged at the center of the lower casing, a second groove is formed in the second boss, and a second marking position is arranged at the edge of the lower casing.

Furthermore, the flexible circuit board is provided with a third through hole and an external power supply part, a boss of the lower shell penetrates through the third through hole to fix the flexible circuit board on the lower shell, the external power supply part extends out of the notch of the upper shell, and the coil is arranged on the flexible circuit board and located on the periphery of the third through hole.

A manufacturing method of a flat vibration motor, comprising the steps of:

step one, assembling a rotor assembly:

a1, fixing the magnet and the elastic piece by adopting a positioning mould;

a2, integrally placing the rotor assembly in an injection mold to form a plastic package and integrally forming the rotor assembly;

step two, assembling the stator assembly:

the flexible circuit board is attached to the lower shell, and the coil is attached to the flexible circuit board to form a stator assembly;

step three, assembling a motor:

the lower end of the elastic part of the rotor component is inserted into the groove of the lower shell, the upper shell is fastened and fixed on the lower shell, and the upper end of the elastic part is inserted into the groove of the upper shell, so that the flat vibration motor is assembled.

Further, the rotor assembly assembles:

a1, fixing the magnet, the elastic part and the magnetic conductive sheet by adopting a positioning mould;

a2, placing the whole into an injection mould to form a plastic package and integrally forming the rotor component.

The flat vibration motor and the manufacturing method thereof provided by the invention have the following beneficial effects:

1. the structure of flat vibrating motor has been creatively designed in principle, and rotor subassembly and stator module cooperation design have cancelled the flat motor brush, adopt coil and outside alternating current drive, and the elastic component is fixed to be inserted in the constant head tank of upper casing and lower casing, and is different with the flat motor that adopts bearing pivoted, and flat vibrating motor life-span is longer, start-up response is faster.

2. The flat vibration motor has simple structure and process, less adopted parts and greatly reduced rejection rate, and particularly, the elastic piece is matched with the stator coil current direction to drive the rotor to swing through the inherent resilience force of the elastic piece so as to enable the motor to resonate and generate stronger vibration sense.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

Fig. 1 is a schematic perspective view of a flat vibration motor.

Fig. 2 is a schematic perspective view of the upper housing.

Fig. 3 is a schematic view of an exploded structure of a flat vibration motor.

Fig. 4 is a schematic sectional view of the flat vibration motor.

Fig. 5 is a structural schematic view of a stator assembly incorporating a lower case.

Fig. 6 is a schematic structural view of the elastic member.

Fig. 7 is a perspective view of the flat vibration motor with the upper housing removed.

Fig. 8 is a schematic perspective view of the flat vibration motor without the upper housing and the magnetic conductive sheet.

Fig. 9 is a schematic cross-sectional view of a single coil flat vibration motor.

Fig. 10 is a perspective view of a single coil flat vibration motor with an upper case removed.

Reference numerals: 100-an upper shell, 200-a lower shell, 300-a magnet, 400-a plastic package part, 500-an elastic part, 600-a magnetic conductive sheet, 700-a coil, 800-a flexible circuit board, 101-a first boss, 102-a first groove, 103-a notch, 104-a first mark position, 401-a first through hole, 601-a second through hole, 602-a blind groove, 801-a third through hole, 201-a second boss, 202-a second groove, 203-a second mark position, 501-an upper end of the elastic part, 502-a middle part of the elastic part, 503-a lower end of the elastic part.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1

Referring to fig. 1 to 7, a flat vibration motor includes an upper casing 100 and a lower casing 200, the lower end of the upper casing 100 is open, the upper casing 100 and the lower casing 200 are fastened to form an accommodation space, a stator assembly and a rotor assembly are disposed in the accommodation space, and the rotor assembly is disposed above the stator assembly at intervals.

Stator module includes flexible circuit board 800 and coil 700, and the rotor subassembly includes elastic component 500, magnet 300, magnetic conduction board 600 and plastic-enclosed piece 400, and the central point of upper casing 100 and lower casing 200 puts respectively to accommodation space and sets up the boss, sets up the recess in the middle of the boss, and the rotor subassembly passes through the cooperation of elastic component 500 and the recess of upper casing 100 and lower casing 200 to be fixed in accommodation space, and the quantity of magnet 300 corresponds the setting with the quantity of coil 700. The elastic member 500 fixedly supports the rotor assembly and is respectively fixed in the grooves of the upper casing 100 and the lower casing 200, and the structure of the flat vibration motor is innovatively designed, and the flat vibration motor drives the rotor assembly to swing according to the inherent resilience of the elastic member and the current direction of the stator coil to make the motor generate resonance.

The plastic package part 400 and the elastic part 500 of the rotor assembly are vertically and fixedly arranged in a crossed manner, and the magnets 300 are arranged at two ends of the plastic package part 400; the surface of one side, facing the stator assembly, of the plastic package part 400 is provided with the magnetic conductive sheet 600 in an attaching mode, the shape of the magnetic conductive sheet 600 corresponds to that of the plastic package part 400, and the magnetic conductive sheet 600 has a magnetic conductive effect and can prevent magnetic leakage; the plastic package part 400 provides mechanical assembly positioning for positioning the magnet 300 and positioning the magnetic conductive sheet 600, the plastic package part 400 provides process production reliability and operation simplicity for parts of the rotor assembly, and the integral integrity and the stability in the resonance process of the rotor assembly are guaranteed.

Elastic component 500 adopts the metal material that has the resilience force, it includes the upper end, middle part and lower extreme, elastic component upper end 501 inserts the recess of upper housing 100, the recess of casing under elastic component lower extreme 503 inserts, elastic component middle part 502 and plastic-sealed piece 400 fixed combination, elastic component middle part 502 is integrated into one piece's inflation portion or depressed part, the sectional area at elastic component middle part is greater than or less than, the sectional area of lower extreme, it is bigger to ensure and mould plastics the combination area, can prevent elastic component 500 from becoming flexible from top to bottom, realize better fixed and supporting role to the rotor subassembly, improve the uniformity that elastic component 500 and rotor subassembly wholly actuated, stability for motor resonance provides basic guarantee. The length of the lower end 503 of the elastic member is greater than that of the upper end 501 of the elastic member, and the length of the lower end of the elastic member 500 is greater mainly to provide a space for arranging the stator assembly at intervals. The elastic member 500 provides a resilience force for the swing of the rotor assembly, and the elastic member 500 drives the rotor assembly to swing by changing the current direction of the stator coil through the inherent resilience force so that the motor resonates to generate strong vibration sense.

The horizontal both ends diameter of plastic-sealed piece 400 after injection moulding is greater than the middle part diameter, and both ends are the ellipse, and the plastic-sealed piece 400 both ends that the diameter is big form the breach with the little plastic-sealed piece 400 middle part of diameter, and plastic-sealed piece 400 both ends have the magnet fixed slot, and plastic-sealed piece 400 both ends provide the location for magnet 300, and plastic-sealed piece 400 is the composite construction spare of rotor subassembly, can ensure the rotor subassembly uniformity. The center of the middle of the plastic package 400 is provided with a first through hole 401, the shape of the first through hole 410 is consistent with the shape of the middle of the elastic member 500, and the two ends of the oval shape are symmetrically arranged with the first through hole 401. The second through hole 601 is arranged at the center of the magnetic conductive sheet 600 tightly attached to the lower surface of the plastic package part 400, the first through hole 401 is communicated with the second through hole 601, and the elastic part 500 simultaneously penetrates through the first through hole 401 and the second through hole 601. The elastic part middle part 502 is arranged in the first through hole 401 of the plastic package part 400, the second through hole 601 is stopped at the expansion part of the elastic part middle part 502, the elastic part middle part 502 plays a role in axially positioning the magnetic conductive sheet and the plastic package part, and the position of the elastic part middle part 502 is set to determine the distance between the rotor assembly and the stator assembly.

Blind grooves 602 are formed in two ends of the surface of one side, facing the plastic package part, of the magnetic conductive sheet 600, the magnets 300 are fixed in the blind grooves 602, the blind grooves 602 in the two ends are symmetrically arranged with the second through hole 601 as the center, and stator assemblies are arranged on the other side of the magnetic conductive sheet 600 at intervals.

Upper casing 100 is one end open-ended cylindricly, the internal surface central point of upper casing 100 roof puts and is equipped with first boss 101 towards accommodation space, the central authorities of first boss 101 are equipped with first recess 102, the installation of elastic component upper end 501 is convenient for to first recess 102, upper casing 100 opening end edge sets up breach 103, upper casing opening one end is provided with breach 103 promptly, the surface border position that breach 103 corresponds the upper casing roof is equipped with first mark position 104, first mark position 104 is used for preventing slow-witted, improve automated production equipment's the degree of recognition.

The lower case 200 is a circular plate, a second boss 201 is disposed at the center of the lower case 200 facing the accommodating space, a second groove 202 is disposed at the center of the second boss 201, the second groove 202 is conveniently fixed with the lower end 503 of the elastic member and the lower case 200, a second mark 203 is disposed at the edge of the lower case 200, the second mark 203 is visible from the two side surfaces of the lower case 200, the second mark 203 on the inner surface of the lower case 200 indicates the mounting of the flexible circuit board 800, and the second mark 203 on the outer surface is used for indicating the notch 103 of the upper case 100. The first flag bit 104 is set corresponding to the second flag bit 203.

The first groove 102 and the second groove 202 fix the axial and circumferential degrees of freedom of the elastic member 500, and provide a good supporting point for the resilience of the elastic member 500 and the swing of the rotor assembly.

The flexible circuit board 800 of the stator assembly is provided with a third through hole 801 and an external power supply part (not labeled), the second label position 203 indicates the extending direction of the external power supply part, the second boss 201 of the lower case 200 penetrates through the third through hole 801 to fix the flexible circuit board on the lower case 200, and the coil 700 is arranged on the flexible circuit board 800 and located on the periphery of the third through hole 801. When the upper and lower housings are assembled, the external power supply extends out of the notch 103 of the upper housing 100. The flexible circuit board 800 is provided with a bonding pad (not labeled) for electrical connection between the inside and the outside.

In this embodiment, coil 700 is two hollow ellipses, is located the third through hole both sides respectively, and two coils 700 bond or glue and on flexible circuit board 800, correspond the magnet 300 of rotor subassembly, and when the access power, magnetic field force takes place for coil and magnet, rotor subassembly horizontal hunting, in addition the resilience force of elastic component 500 for flat vibrating motor produces resonance, and the drive power and the sense of vibration experience of reinforcing motor.

According to the flat vibration motor, the rotating bearing of the traditional flat motor is omitted, so that the frictional mechanical noise caused by mutual contact between the rotor shaft and the bearing and between the shaft and the upper and lower casings in the motion is reduced, the service life of the flat vibration motor is prolonged, the reliability is high, the starting response is fast, the vibration sense is strong, meanwhile, the structure and the process of the flat vibration motor are simple, fewer adopted parts are needed, the rejection rate is greatly reduced, and the cost of the flat vibration motor is lower.

Example 2

Referring to fig. 8, under the solution of embodiment 1, the magnetic conductive plate 600 is eliminated.

Example 3

Referring to fig. 9 and 10, in the present embodiment, one coil 700 is disposed at one side of the third through hole 801 of the flexible circuit board 800, and one magnet 300 is disposed corresponding to the coil 700. The plastic package piece under this embodiment is eccentric settings, realizes more intense vibration. The second mark position 203 of the lower chassis 200 may be provided as a protrusion extending from an edge of the lower chassis and also function to support the external power supply portion of the flexible circuit board 800. In this embodiment, the magnetic conductive sheet 600 may be disposed or may not be disposed.

It is noted that in other embodiments, the coils 700 may be an even number, with the magnets of the rotor assembly being arranged to correspond to the number of coils.

In the above embodiments 1 to 3, the N/S of the magnet 300 corresponds to the N/S of the coil 700, and the change of the alternating current direction in the coil 700 changes the N/S of the coil 700, i.e. the rotor is driven to swing by changing the current direction of the coil, and at the same time, the motor resonates and realizes a stronger vibration sensing experience in combination with the inherent resilience of the elastic member.

Referring to fig. 1 to 10, the swing of the rotor of the single and double coil embodiments of the flat vibration motor can be driven by changing the current direction of the coil, and the manufacturing method of the flat vibration motor includes the following steps:

step one, assembling a rotor assembly:

a1, fixing the magnet 300 and the elastic piece 500 by adopting a positioning mould;

step two, assembling the stator assembly:

the flexible circuit board 800 is attached to the lower case, and the coil 700 is attached to the flexible circuit board 800 to form a stator assembly;

step three, assembling a motor:

the lower end of the elastic member 500 of the rotor assembly is inserted into the groove of the lower case 200 to fasten the upper case 100 to the lower case 200, and the upper end of the elastic member 500 is inserted into the groove of the upper case 100 to complete the assembly of the flat vibration motor.

In the first and third embodiments, the magnet 300 and the elastic member 500 of the rotor assembly are fixed, and then the magnet 300 and the elastic member 500 are integrally injection-molded to form a plastic package, so as to integrally form the rotor assembly, in this embodiment, the rotor assembly is not provided with the magnetic conductive sheet 600, as shown in fig. 8, and finally, the rotor assembly is subjected to performance testing.

Further, the magnetic conductive sheet 600 is added on the basis of the first embodiment in the first step to form the rotor assembly of the second embodiment:

In the second embodiment, the rotor assembly is additionally provided with the magnetic conductive plate 600, the magnet 300, the elastic member 500 and the magnetic conductive plate 600 of the rotor assembly are fixed, then the magnet 300, the elastic member 500 and the magnetic conductive plate 600 are integrally placed in the injection mold, the rotor assembly is integrally injected, as shown in fig. 7, and finally the rotor assembly is subjected to performance detection.

In addition, the balancing weight can adopt the alloy material that the quality is big, makes its vibration volume big, and the motor is shaken the sense and is strong, also can adopt other materials commonly used to replace.

The above embodiments are only for the purpose of helping understanding the method of the present invention and the core idea thereof, and are not intended to limit the present invention, and various modifications and variations of the present invention may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The flat vibration motor is characterized by comprising an upper shell and a lower shell, wherein the upper shell and the lower shell are buckled to form an accommodating space, a stator assembly and a rotor assembly are arranged in the accommodating space, the stator assembly comprises a flexible circuit board and a coil, the rotor assembly comprises an elastic piece, a magnet and a plastic package piece, bosses are respectively arranged at the central positions of the upper shell and the lower shell in the accommodating space, a groove is formed in the middle of each boss, the rotor assembly is fixed in the accommodating space through the cooperation of the elastic piece and the grooves of the upper shell and the lower shell, and the number of the magnets corresponds to the number of the coils.

2. A flat vibration motor as claimed in claim 1, wherein: the elastic piece comprises an upper end, a middle part and a lower end, the upper end of the elastic piece is inserted into the groove of the upper casing, the lower end of the elastic piece is inserted into the groove of the lower casing, the middle part of the elastic piece is fixedly combined with the plastic package piece, and the length of the lower end of the elastic piece is greater than that of the upper end of the elastic piece.

3. A flat vibration motor as claimed in claim 1, wherein: the diameter of the two ends of the plastic package part is larger than that of the middle part of the plastic package part, the two ends of the plastic package part are in an oval shape, a first through hole is formed in the center of the middle part of the plastic package part, the two oval ends of the plastic package part are symmetrically arranged through the first through hole, magnets are arranged in the two ends of the plastic package part, and the first through hole of the plastic package part is arranged in the middle of the.

4. A flat vibration motor as claimed in claim 1, wherein: the plastic package part is provided with magnetic conductive sheets towards the surface of one side of the stator assembly in a laminating manner, the shapes of the magnetic conductive sheets are arranged corresponding to the plastic package part, the middle parts of the magnetic conductive sheets are provided with second through holes, blind grooves are formed in the two ends of the magnetic conductive sheets, the blind grooves fix magnets, and the stator assembly is arranged on the other side of the magnetic conductive sheets at intervals.

5. A flat vibration motor as claimed in claim 1, wherein: the upper casing is cylindrical with an opening at one end, a first boss is arranged at the center of the inner surface of the top wall of the upper casing and provided with a first groove, a notch is arranged at the edge of the opening end of the upper casing, and a first marking position is arranged at the edge of the outer surface of the top wall of the upper casing corresponding to the notch.

6. A flat vibration motor as claimed in claim 1, wherein: the lower casing is in a circular plate shape, a second boss is arranged at the center of the lower casing and provided with a second groove, and a second marking position is arranged at the edge of the lower casing.

7. A flat vibration motor as claimed in claim 1, wherein: the flexible circuit board is provided with a third through hole and an external power supply part, a boss of the lower shell penetrates through the third through hole to fix the flexible circuit board on the lower shell, the external power supply part extends out of the notch of the upper shell, and the coil is arranged on the flexible circuit board and located on the periphery of the third through hole.

8. A method of manufacturing a flat vibration motor, comprising the steps of:

step one, assembling a rotor assembly:

a1, fixing the magnet and the elastic piece by adopting a positioning mould;

step two, assembling the stator assembly:

step three, assembling a motor:

9. A method of manufacturing a flat vibration motor according to claim 8, wherein: step one, assembling a rotor assembly: