A novel linear vibration motor and its implementation method

Abstract

The present invention discloses a novel linear vibration motor, which comprises a lower bracket. An FPC board is arranged on the upper surface of the lower bracket. A coil is arranged above the FPC board. A wire core is arranged inside the coil. A shrapnel is arranged inside the wire core. Counterweights are respectively arranged at both ends of the shrapnel. A casing is arranged above the lower bracket. Two symmetric first magnetic steels are arranged at one end inside the casing. Two symmetric second magnetic steels are arranged at the other end inside the casing. The present invention also discloses a method for realizing the novel linear vibration motor. When the coil is powered on, an electric field is generated to polarize the shrapnel, which interacts with the driving magnetic fields generated by the first magnetic steel and the second magnetic steel, so that alternating forces are applied to both ends of the shrapnel to generate vibrations, thereby driving the counterweights to generate small-angle swing vibrations and generating a vibration sensation.

Description

Technical Field

[0001] The present invention belongs to the technical field of linear vibration motors, and particularly relates to a novel linear vibration motor and a method for realizing the same. Background Art

[0002] Micro vibration motors are indispensable components in electronic products such as mobile phones, tablet computers, and electronic toys, which provide tactile feedback for users. With the increasing competition in the smart phone market, mobile phone manufacturers pay more and more attention to the tactile experience of users, and linear vibration motors different from traditional rotor motors have emerged on the market.

[0003] Compared with traditional rotor motors, linear motors have great advantages in vibration characteristics, response time, service life, and noise, and they can provide multiple vibration modes, providing users with rich, diverse, delicate, and realistic tactile feedback.

[0004] Currently, the mainstream linear vibration motors on the market adopt a coil and magnet structure, driving the motor to reciprocate through the force between the energized coil and the magnet, and providing the restoring force for the reciprocating motion of the motor through a leaf spring. However, most of the current leaf springs are welded between the mass block and the housing, resulting in problems that are not convenient for assembly. Summary of the Invention

[0005] The purpose of the present invention is to provide a novel linear vibration motor to solve the problems raised in the above background art. A novel linear vibration motor provided by the present invention has the characteristics of simple structure, convenient production, and convenient assembly.

[0006] Another purpose of the present invention is to provide a method for realizing a novel linear vibration motor.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A novel linear vibration motor includes a lower bracket. An FPC board is provided on the upper surface of the lower bracket. A coil is provided above the FPC board. A wire core is provided inside the coil. A leaf spring is provided inside the wire core. Counterweight blocks are respectively provided at both ends of the leaf spring. A housing is provided above the lower bracket. Two symmetric first magnets are provided at one end inside the housing. Two symmetric second magnets are provided at the other end inside the housing.

[0008] In order to facilitate the quick connection between the leaf spring and the counterweight block, and at the same time ensure the stability of the connection between the counterweight block and the leaf spring, further, a slot is provided on the counterweight block, and the end of the leaf spring is embedded in the slot.

[0009] In order to facilitate the quick assembly of the leaf spring and the wire core, and the assembly process is simple, further, a through groove is provided inside the wire core, and one end of the leaf spring passes through the through groove and is fixedly connected to the wire core.

[0010] To ensure the balance of vibration, further, both ends of the elastic piece are symmetrically arranged with respect to the wire core.

[0011] To generate an electric field when the coil is energized to polarize the elastic piece, interact with the driving magnetic fields generated by the first magnet and the second magnet, so that both ends of the elastic piece are subjected to an alternating force to generate vibration, thereby driving the counterweight to generate a small-angle swinging vibration and generating a vibration sensation. Further, the magnetic pole directions of the two first magnets are the same, and the magnetic pole directions of the two second magnets are the same. The magnetic pole direction of the first magnet is opposite to the magnetic pole direction of the second magnet.

[0012] To facilitate the production of the elastic piece, further, the elastic piece is of a flat plate structure.

[0013] To enable the elastic piece to be polarized when the coil is energized, further, the elastic piece is a magnetic conductive component.

[0014] To facilitate the quick positioning between the elastic piece and the wire core, further, a marking line corresponding to the side of the wire core is provided on the elastic piece.

[0015] In the present invention, further, a method for implementing a novel linear vibration motor includes the following steps:

[0016] (1). The lower bracket and the housing form a closed cavity;

[0017] (2). Two first magnets and two second magnets provide a driving magnetic field for the motor;

[0018] (3). When the coil is energized, an electric field is generated to polarize the elastic piece, interact with the driving magnetic field, so that both ends of the elastic piece are subjected to an alternating force to generate vibration, thereby driving the counterweight to generate vibration and generating a vibration sensation;

[0019] (4). The elastic piece provides elastic force for the vibration of the motor, so that the motor vibrates reciprocally.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. When the coil of the present invention is energized, an electric field is generated to polarize the elastic piece, interact with the driving magnetic fields generated by the first magnet and the second magnet, so that both ends of the elastic piece are subjected to an alternating force to generate vibration, thereby driving the counterweight to generate a small-angle swinging vibration and generating a vibration sensation;

[0022] 2. A clamping groove is provided on the counterweight of the present invention, and the end of the elastic piece is embedded in the clamping groove, and the elastic piece is welded to the counterweight, which is convenient for the quick connection between the elastic piece and the counterweight, and at the same time ensures the stability of the connection between the counterweight and the elastic piece;

[0023] 3. A through groove is provided inside the wire core of the present invention, and one end of the elastic piece passes through the through groove and is fixedly connected to the wire core, which is convenient for the quick assembly of the elastic piece and the wire core, and the assembly process is simple;

[0024] 4. The shrapnel of the present invention has a flat plate structure, which is convenient for the production of the shrapnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic explosion structure diagram of the present invention;

[0026] Figure 2 is a schematic structure diagram of the counterweight of the present invention;

[0027] Figure 3 is a schematic structure diagram of the wire core of the present invention;

[0028] Figure 4 is a schematic structure diagram of the present invention;

[0029] Figure 5 for the present invention Figure 4 is a schematic cross-sectional structure diagram taken along the A-A direction in the present invention;

[0030] Figure 6 is a schematic electromagnetic drive structure diagram of the present invention;

[0031] Figure 7 is a schematic structure diagram of the shrapnel in Embodiment 2 of the present invention.

[0032] In the figure: 1. Housing; 2. Counterweight; 21. Card slot; 3. Shrapnel; 31. Marking line; 4. First permanent magnet; 5. FPC board; 6. Lower bracket; 7. Second permanent magnet; 8. Wire core; 81. Through groove; 9. Coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] Please refer to Figure 1-6, the present invention provides the following technical solution: a novel linear vibration motor, including a lower bracket 6, an FPC board 5 is bonded to the upper surface of the lower bracket 6, a coil 9 is provided above the FPC board 5, the coil 9 is bonded to the FPC board 5, and the end of the coil 9 is welded to the FPC board 5. A core 8 is bonded inside the coil 9. The core 8 can be a magnetic material or a non-magnetic material. In this embodiment, it is preferably made of stainless steel magnetic material. A shrapnel 3 is provided inside the core 8. Counterweights 2 are provided at both ends of the shrapnel 3. An outer casing 1 is provided above the lower bracket 6. Two symmetrically arranged first magnetic steels 4 are provided at one end inside the outer casing 1. Two symmetrically arranged second magnetic steels 7 are provided at the other end inside the outer casing 1. The first magnetic steels 4 and the second magnetic steels 7 are respectively bonded to the inner wall of the outer casing 1.

[0036] By adopting the above technical solution, when the coil 9 is energized, an electric field is generated to polarize the shrapnel 3, which interacts with the driving magnetic fields generated by the first magnetic steels 4 and the second magnetic steels 7, so that alternating forces are applied to both ends of the shrapnel 3 to generate vibration, thereby driving the counterweights to generate a small-angle swing vibration and generating a vibration sensation.

[0037] Specifically, a card slot 21 is provided on the counterweight 2, and the end of the shrapnel 3 is embedded in the card slot 21, and the shrapnel 3 is welded to the counterweight 2.

[0038] By adopting the above technical solution, it is convenient for the quick connection between the shrapnel 3 and the counterweight 2, and at the same time, the stability of the connection between the counterweight 2 and the shrapnel 3 is ensured.

[0039] Specifically, a through slot 81 is provided inside the core 8. One end of the shrapnel 3 passes through the through slot 81 and is fixedly connected to the core 8, and the shrapnel 3 is bonded to the core 8 with glue.

[0040] By adopting the above technical solution, it is convenient for the quick assembly of the shrapnel 3 and the core 8, and the assembly process is simple.

[0041] Specifically, both ends of the shrapnel 3 are symmetrically arranged with respect to the core 8.

[0042] By adopting the above technical solution, the balance of vibration is ensured.

[0043] Specifically, the magnetic pole directions of the two first magnetic steels 4 are the same, and the magnetic pole directions of the two second magnetic steels 7 are the same. The magnetic pole direction of the first magnetic steel 4 is opposite to the magnetic pole direction of the second magnetic steel 7.

[0044] By adopting the above technical solution, when the coil 9 is energized, an electric field is generated to polarize the shrapnel 3, which interacts with the driving magnetic fields generated by the first magnetic steels 4 and the second magnetic steels 7, so that alternating forces are applied to both ends of the shrapnel 3 to generate vibration, thereby driving the counterweights to generate a small-angle swing vibration and generating a vibration sensation.

[0045] Specifically, the shrapnel 3 is of a flat plate structure.

[0046] By adopting the above technical solution, it is convenient to produce the elastic piece 3.

[0047] Specifically, the elastic piece 3 is a magnetic conductive member, and preferably made of stainless steel magnetic conductive material in this embodiment.

[0048] By adopting the above technical solution, the elastic piece 3 can be polarized when the coil 9 is energized.

[0049] Embodiment 2

[0050] Please refer to Figure 7 , the difference between this embodiment and Embodiment 1 is that: specifically, a marking line 31 corresponding to the side of the wire core 8 is provided on the elastic piece 3.

[0051] By adopting the above technical solution, it is convenient for quick positioning between the elastic piece 3 and the wire core 8.

[0052] Embodiment 3

[0053] Furthermore, a method for realizing a novel linear vibration motor of the present invention includes the following steps:

[0054] (1). The lower bracket 6 and the housing 1 form a closed cavity;

[0055] (2). Two first magnetic steels 4 and two second magnetic steels 7 provide a driving magnetic field for the motor;

[0056] (3). When the coil is energized, an electric field is generated to polarize the elastic piece 3, which interacts with the driving magnetic field, so that alternating forces are applied to both ends of the elastic piece 3 to generate vibration, thereby driving the counterweight 2 to generate vibration and producing a vibration sensation;

[0057] (4). The elastic piece 3 provides elastic force for the vibration of the motor, enabling the motor to vibrate reciprocally.

[0058] In summary, when the coil 9 of the present invention is energized, an electric field is generated to polarize the elastic piece 3, which interacts with the driving magnetic fields generated by the first magnetic steel 4 and the second magnetic steel 7, so that alternating forces are applied to both ends of the elastic piece 3 to generate vibration, thereby driving the counterweight to generate a small-angle swinging vibration and producing a vibration sensation; a card slot 21 is provided on the counterweight 2 of the present invention, and the end of the elastic piece 3 is embedded in the card slot 21, and the elastic piece 3 is welded to the counterweight 2, which is convenient for the quick connection between the elastic piece 3 and the counterweight 2 and ensures the stability of the connection between the counterweight 2 and the elastic piece 3; a through groove 81 is provided inside the wire core 8 of the present invention, and one end of the elastic piece 3 passes through the through groove 81 and is fixedly connected to the wire core 8, which is convenient for the quick assembly of the elastic piece 3 and the wire core 8 and has a simple assembly process; the elastic piece 3 of the present invention is in a flat plate structure, which is convenient for the production of the elastic piece 3.

[0059] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel linear vibration motor, comprising a lower bracket, characterized in that: The upper surface of the lower bracket is provided with an FPC board. Above the FPC board, there is a coil. Inside the coil, there is a wire core. Inside the wire core, there is a shrapnel. Counterweights are respectively arranged at both ends of the shrapnel. Above the lower bracket, there is a housing. At one end inside the housing, there are two symmetrically arranged first permanent magnets. At the other end inside the housing, there are two symmetrically arranged second permanent magnets.

2. The novel linear vibration motor according to claim 1, wherein: A clamping groove is arranged on the counterweight, and the end of the shrapnel is embedded in the clamping groove.

3. A novel linear vibration motor according to claim 1, characterized in that: A through groove is arranged inside the wire core, and one end of the shrapnel passes through the through groove and is fixedly connected to the wire core.

4. A novel linear vibration motor according to claim 3, wherein: Both ends of the shrapnel are symmetrically arranged with respect to the wire core.

5. A novel linear vibration motor according to claim 1, characterized in that: The magnetic pole directions of the two first permanent magnets are the same, and the magnetic pole directions of the two second permanent magnets are the same.

6. A novel linear vibration motor according to claim 5, characterized in that: The magnetic pole direction of the first permanent magnet is opposite to the magnetic pole direction of the second permanent magnet.

7. A novel linear vibration motor according to claim 1, characterized in that: The shrapnel is of a flat plate structure.

8. A novel linear vibration motor according to claim 1, wherein: The shrapnel is a magnetic conductive component.

9. A novel linear vibration motor according to claim 1, characterized in that: Marking lines corresponding to the side of the wire core are arranged on the shrapnel.

10. A method for implementing a novel linear vibration motor according to any one of claims 1-9, characterized in that, It includes the following steps: (1). The lower bracket and the housing form a closed cavity. (2). The two first permanent magnets and the two second permanent magnets provide a driving magnetic field for the motor. (3). When the coil is energized, an electric field is generated to polarize the shrapnel. The shrapnel interacts with the driving magnetic field, so that alternating forces are applied to both ends of the shrapnel to generate vibration, thereby driving the counterweight to generate vibration and producing a vibration sensation. (4). The shrapnel provides elastic force for the vibration of the motor, causing the motor to vibrate reciprocally.

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