Complete structure of vibration motor

Abstract

The utility model discloses a whole structure of a vibration motor, which comprises an upper shell and a lower shell, an FPCB (flexible printed circuit board) and a coil are fixed on the lower shell, a mass block is arranged in the upper shell, a magnet is arranged on the mass block, two elastic sheets are arranged on the mass block in a central symmetry manner, and thickening plates are integrally arranged on the inner sides of the elastic sheets. The elastic sheet is welded on the periphery of the mass block through the thickening plate; a protruding plate is arranged on the upper side of the movable end of the elastic piece and abuts against the top of the inner side of the upper shell. According to the utility model, the elastic sheet is directly welded on the mass block through the integrally arranged thickened part, so that the step of welding the elastic sheet and the supporting sheet is omitted, the production process is simplified, and the problem of poor welding caused by a gap and position deviation between the elastic sheet and the supporting sheet in the welding process is avoided; the elastic piece is provided with the protruding plate which abuts against the upper shell, it is guaranteed that the gap between the inner surface of the upper shell and the upper surface of the mass block is enough, the problem of poor noise generated in the product vibration process is avoided, and the product performance yield is improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, and in particular to the overall structure of a vibration motor. Background Technology

[0002] With the development of smart products, linear motors are increasingly being used in various fields such as VR / AR, e-cigarettes, and smart wearables. Meanwhile, to save costs and internal space, electronic devices require increasingly smaller linear motors. However, the small size and limited internal space of miniaturized linear motors result in lower assembly yields. Furthermore, traditional structural designs, with their numerous components, lead to higher material costs. Therefore, optimizing and reducing the number of components in existing traditional linear motor structures, while simultaneously improving the assembly yield of miniaturized motors and achieving automated production, are pressing issues that need to be addressed in the development of miniaturized motors.

[0003] In the existing transverse linear motor oscillator structure, the spring plate is an important component, playing a role in supporting the oscillator and providing restoring force. During the assembly of the oscillator assembly, in order to improve the pull-out force between the spring plate and other components, the spring plate is generally welded to the support plate first and then welded to other components. However, during the welding process between the spring plate and the support plate, gaps and positional deviations between the two often lead to a large number of welding defects during production, making the manufacturing process difficult and increasing the material cost of the product. Secondly, during the assembly of the oscillator assembly with the upper housing, poor flatness of the assembly fixture often results in a small gap between the inner surface of the upper housing and the upper surface of the mass block after the product is assembled, leading to noise problems during product vibration.

[0004] In addition, the magnetic circuit structure of existing linear motors mostly adopts the method of "mass block with a central through hole structure + magnetic sheet". However, during the assembly process of this magnetic circuit component, the different materials of the magnetic sheet and the mass block or the poor gap between them often lead to a high rate of welding defects. This process not only increases the difficulty of the process, but also seriously reduces the yield of the process. Furthermore, the mass block with a central through hole structure design has a large mass weight loss in micro products, which reduces the product's vibration.

[0005] Secondly, the damping materials of existing transverse linear motors are mostly foam or elastic colloids. The damping material is often attached between the spring and the housing or mass block. As a buffer damping material, foam will increase the natural coefficient and stress of the spring under the same vibration displacement conditions, thereby reducing the fatigue life of the spring and affecting the natural frequency of the product. Therefore, how to minimize the impact of damping material on spring life and product performance by changing the internal structure of the product is an urgent problem to be solved.

[0006] Furthermore, the flexible circuit boards of existing linear motors mostly adopt a "planar" structure design. Due to the influence of external solder pads, this structure occupies a large amount of overall structural space, which seriously affects the battery life of the entire machine. Utility Model Content

[0007] The purpose of this utility model is to avoid the shortcomings of the prior art and provide a complete structure for a vibration motor, thereby effectively solving the shortcomings of the prior art.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a complete structure of a vibration motor, including an upper shell and a lower shell, with an FPCB and a coil fixed on the lower shell, a mass block disposed in the upper shell, a magnet disposed on the mass block, and two spring pieces centrally symmetrically disposed on the mass block, the movable ends of the two spring pieces abutting against the inner side of the upper shell, the spring pieces being C-shaped, a thickened plate integrally disposed on the inner side of the spring pieces, the spring pieces being welded to the outer periphery of the mass block through the thickened plate; a protruding plate is disposed on the upper side of the movable end of the spring piece, the protruding plate abutting against the top of the inner side of the upper shell.

[0009] Furthermore, a positioning plate is provided on the mass block in conjunction with the spring sheet, and the thickened plate abuts against the positioning plate.

[0010] Furthermore, a groove is provided at the bottom of the mass block, and the magnet is fixed in the groove.

[0011] Furthermore, a buffer pad is provided between the mass block and the spring sheet.

[0012] Furthermore, the mass block is provided with a groove in conjunction with the buffer pad, and the inner side of the groove is parallel to the vibrating arm of the spring.

[0013] Furthermore, one end of the FPCB is fixed to the inner side of the lower housing, and the other end extends out of the outer side of the lower housing. The FPCB located on the outer side of the lower housing is bent 180° and then attached to the bottom of the lower housing.

[0014] The above-mentioned technical solution of this utility model has the following beneficial effects: The spring sheet of this utility model is directly welded to the mass block through an integrally set thickened part, which eliminates the step of welding the spring sheet and the support sheet, simplifies the production process, and avoids welding defects caused by gaps and positional deviations between the spring sheet and the support sheet during the welding process; a convex plate is set on the spring sheet to abut against the upper shell, ensuring that the gap between the inner surface of the upper shell and the upper surface of the mass block is sufficient, avoiding noise problems generated during product vibration, and improving product performance and yield. Attached Figure Description

[0015] Figure 1 This is a three-dimensional explosion diagram of an embodiment of the present invention;

[0016] Figure 2This is a three-dimensional schematic diagram of the connection between the spring and the mass block in an embodiment of this utility model;

[0017] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0018] Figure 4 This is a three-dimensional schematic diagram of the bottom of the mass block in an embodiment of the present invention;

[0019] Figure 5 This is a three-dimensional schematic diagram of the bonding position between the FPCB and the lower housing in an embodiment of the present invention;

[0020] Figure 6 This is a cross-sectional schematic diagram showing the magnet arrangement direction in an embodiment of this utility model. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the present invention.

[0022] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "rear end," "front end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] like Figure 1-6As shown, the overall structure of a vibration motor in this embodiment includes an upper housing 1 and a lower housing 2. An FPCB 3 and a coil 4 are fixed on the lower housing 2. A mass block 5 is disposed in the upper housing 1, and a magnet 6 is disposed on the mass block 5. Two spring pieces 7 are centrally symmetrically disposed on the mass block 5, with their movable ends abutting against the inner side of the upper housing 1. The spring pieces 7 are C-shaped, and a thickened plate 8 is integrally disposed on the inner side of each spring piece 7. The spring pieces 7 are welded to the outer periphery of the mass block 5 through the thickened plate 8. A protruding plate 9 is disposed on the upper side of the movable end of each spring piece 7. The protruding plate 9 abuts against the inner top of the upper housing 1; the spring piece 7 is directly welded to the mass block 5 through an integrally set thickened part, eliminating the step of welding the spring piece 7 to the support piece, simplifying the production process, and avoiding welding defects caused by gaps and positional deviations between the spring piece 7 and the support piece during the welding process; the protruding plate 9 on the spring piece 7 abuts against the upper housing 1, ensuring that the gap between the inner surface of the upper housing 1 and the upper surface of the mass block 5 is sufficient, avoiding noise problems generated during product vibration, and improving product performance yield;

[0024] Preferably, a positioning plate 10 is provided on the mass block 5 in conjunction with the spring piece 7, and a thickened plate 8 abuts against the positioning plate 10; this facilitates positioning when the spring piece 7 is welded to the mass block 5.

[0025] Preferably, the bottom of the mass block 5 is provided with a groove 11, and the magnet 6 is fixed in the groove 11; the prior art is to attach a magnetic conductive sheet (not shown in the figure) to a hollow mass block 5, which has a lower mass and is not as obvious as the vibration in this application;

[0026] In this embodiment, three magnets 6 are arranged in the mass block 5. The two magnets 6 on both sides are placed in opposite directions, and the middle magnet 6 is placed horizontally. The N pole of the middle magnet 6 faces the side of the magnet 6 with the N pole facing down. The three magnets 6 form a Heilbeck magnetic circuit. The function of the magnetic conductive sheet is the same as that of the magnet 6 in the middle part of this application. This application sets the three magnets 6 in parallel as a Heilbeck magnetic circuit, which can improve the utilization rate of the magnetic field lines of the product, reduce the impact of removing the magnetic conductive sheet structure on the overall performance of the product, improve the overall flatness, and optimize the vibration effect. In other embodiments, the magnet 6 can also be set as a multi-magnetic circuit structure.

[0027] Preferably, a buffer pad 12 is provided between the mass block 5 and the spring piece 7. In this embodiment, the buffer pad 12 is a foam pad, which can buffer the resetting of the spring piece 7.

[0028] Preferably, the mass block 5 is provided with a groove 13 in conjunction with the buffer pad 12. The inner side of the groove 13 is parallel to the vibrating arm of the spring 7. The buffer pad 12 is disposed in the groove 13. When the spring 7 deforms and causes the mass block 5 to vibrate, it can ensure that the buffer pad 12 as a whole contacts the vibrating arm of the spring 7 for buffering. This avoids the buffer pad 12 contacting the vibrating arm of the spring 7 only by its edge, thus preventing continuous stress concentration on the spring 7 and extending the fatigue life of the spring 7.

[0029] Preferably, one end of the FPCB3 is fixed to the inside of the lower housing 2, and the other end extends out of the outside of the lower housing 2. The FPCB3 located on the outside of the lower housing 2 is bent 180° and attached to the bottom of the lower housing 2; this saves internal structural space in the overall application and improves the utilization rate of the internal structure of the whole machine.

[0030] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A complete structure of a vibration motor, comprising an upper shell and a lower shell, an FPCB and a coil are fixed on the lower shell, a mass is arranged in the upper shell, a magnet is arranged on the mass, two elastic sheets are arranged symmetrically on the mass, and the movable ends of the two elastic sheets abut against the inner side of the upper shell, characterized in that: The elastic sheet is C-shaped, and a thickened plate is integrally arranged on the inner side of the elastic sheet, and the elastic sheet is welded to the outer periphery of the mass block through the thickened plate; a convex plate is arranged on the upper side of the movable end of the elastic sheet, and the convex plate abuts against the inner top of the upper shell.

2. The whole structure of a vibration motor according to claim 1, characterized in that: A positioning plate is arranged on the mass block matched with the elastic sheet, and the thickened plate abuts against the positioning plate.

3. The whole structure of the vibration motor according to claim 1, characterized in that: The bottom of the mass block is provided with a groove, and the magnet is fixed in the groove.

4. The whole structure of a vibration motor according to claim 1, characterized in that: A buffer pad is arranged between the mass block and the elastic sheet.

5. The whole structure of a vibration motor according to claim 4, characterized in that: An inclined groove is arranged on the mass block matched with the buffer pad, and the inner side of the inclined groove is parallel to the vibration arm of the elastic sheet.

6. The whole structure of a vibration motor according to claim 1, characterized in that: One end of the FPCB is fixed to the inner side of the lower shell, and the other end extends out of the lower shell, and the FPCB located outside the lower shell is bent by 180° and attached to the bottom of the lower shell.

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