Vibration exciter

Abstract

The present application provides a vibration exciter. [Solution] The present invention includes a housing having an accommodation space, a vibration unit suspended in the accommodation space, an elastic unit connected to the vibration unit and accommodated in the accommodation space, and a drive unit fixed to the housing and for driving the vibration of the vibration unit, the vibration unit including an annular mass block, a covering member covering the outside of the mass block and enclosing the inside to form a mounting cavity, a pole core connected to the covering member and positioned inside the mounting cavity, and a magnet steel fixed to the pole core on the side farther from the mass block, the drive unit being accommodated and left in the mounting cavity. The vibration exciter of the present application can effectively reduce production costs and improve the fixing stability between the mass block and parts such as machines and magnet steel.

Description

[Technical Field]

[0001] The present invention relates to the technical field of vocalization devices, and in particular to vibration exciters. [Background technology]

[0002] With the development of electronic technology, portable consumer electronic products such as mobile phones, portable game consoles, navigation devices, and handheld multimedia devices are becoming increasingly popular. These electronic products are inseparable from the application of sound generating devices, and these sound generating devices are often associated with vibration exciters. In related technologies, the mass block that provides vibration on the vibration exciter is often fixed to components such as pole cores and magnetic steel by welding, which results in a large welding contact surface, high requirements for mass block molding, and high process costs. Summary of the Invention [Problem to be solved by the invention]

[0003] An object of the present application is to provide a vibration exciter that can solve the technical problem of high process costs for vibration exciters in related art. [Means for solving the problem]

[0004] The technical solution of the present application is as follows: a vibration exciter, comprising: a housing having an accommodation space; a vibration unit suspended in the accommodation space; an elastic unit connected to the vibration unit and accommodated in the accommodation space; and a drive unit fixed to the housing and for driving the vibration unit to vibrate, wherein the vibration unit comprises an annular mass block; a covering member covering the outside of the mass block and enclosing the inside to form a mounting cavity; a pole core connected to the covering member and positioned inside the mounting cavity; and a magnetic steel fixed to the side of the pole core remote from the mass block, and the drive unit is left accommodated in the mounting cavity.

[0005] Furthermore, elastic units are provided on opposite sides of the mass block, and the elastic units include a spring holder suspended within the accommodation space and a first fixed block fixed between one end of the spring holder and the housing side wall, and a second fixed block is provided between the other end of the spring holder and the mass block.

[0006] Furthermore, the covering member includes a first covering portion covering the mass block and a second covering portion connected to the outside of the first covering portion, and the second covering portion is covered on the outside of the second fixed block and the outside of the corresponding end of the spring holder.

[0007] Furthermore, the second fixing block is fixed to the outside of the mass block and protrudes to the outside of the covering member, and the outer end surface of the second fixing block is welded and fixed to the elastic unit.

[0008] Furthermore, the mounting cavity has at least two sub-cavities that are formed inside the covering member, arranged in sequence, and communicate with each other, one pole core is fixed between two adjacent sub-cavities, magnetic steel is fixed to each side inner wall of each sub-cavity, and a drive unit is provided inside each sub-cavity.

[0009] Furthermore, the drive unit includes a bobbin fixed to the housing, a coil wound around the bobbin, and an FPC unit fixed to the housing and electrically connected to the coil, and there is a gap between the magnetic steel and the coil.

[0010] Furthermore, the covering member is fixed to the pole core and the magnet steel by adhesive curing or heat curing, respectively.

[0011] Furthermore, a positioning portion is provided within the mounting cavity, extending from the side wall into the cavity, and a positioning notch is opened in the positioning portion, and positioning protrusions protrude from both ends of the pole core, and the positioning protrusions are fitted into the corresponding positioning notches.

[0012] Furthermore, two adjacent positioning portions are spaced apart to form a positioning groove, and the magnet steel is fitted into the positioning groove.

[0013] Furthermore, an adhesive containing groove is formed around the periphery of the second fixing block, and the covering member covers the outer periphery of the second fixing block and fills the adhesive containing groove. [Effects of the Invention]

[0014] The beneficial effect of the present invention is that the outside of the mass block is covered with a covering member, and the pole core and magnetic steel are inserted into the mounting cavity formed inside the mass block by the covering member, so that the mass block, pole core, magnetic steel, and other components can be integrated and connected with the covering member. Compared with the conventional welding fixing method, the fixing stability of the covering fixing method is relatively high, and the input of equipment such as welding is not required, so that production costs can be effectively reduced. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is an exploded view of the vibration exciter of the present invention. [Figure 2] FIG. 2 is a schematic diagram of a partial structure of an embodiment of the vibration exciter of the present application. [Figure 3] FIG. 3 is a schematic diagram of a partial structure of another embodiment of the vibration exciter of the present application. [Figure 4] FIG. 4 is a schematic diagram of the overall shape of the vibration exciter of the present invention. [Figure 5] FIG. 5 is a cross-sectional view of the vibration exciter of the present invention taken along the line AA in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present application will be further described below in conjunction with the drawings and embodiments, in which the same or similar reference numerals throughout indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are merely examples intended to interpret the present invention and should not be understood as limitations on the present invention. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present invention without creative work are also within the scope of protection of the present invention.

[0017] In the description of the present invention, the orientations or positional relationships indicated by terms such as "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "base," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "circumferential direction," and "radial direction" are orientations or positional relationships shown based on the drawings, and are intended to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or elements shown necessarily have a specific orientation and are configured and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or the number of technical features shown. Thus, a feature qualified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this invention, unless otherwise expressly specified, the meaning of "plurality" means two or more.

[0019] Working Example: As shown in Figures 1-5, in this embodiment, the vibration exciter comprises a housing 1 having an accommodation space, a vibration unit 2 suspended in the accommodation space, an elastic unit 3 connected to the vibration unit 2 and accommodated in the accommodation space, and a drive unit 4 fixed to the housing 1 and for driving the vibration of the vibration unit 2, and the vibration unit 2 comprises an annular mass block 21, a covering member 22 that covers the outside of the mass block 21 and encloses the inside to form a mounting cavity 221, a pole core 23 that is connected to the covering member 22 and located inside the mounting cavity 221, and a magnetic steel 24 that is fixed to the side of the pole core 23 away from the mass block 21, and the drive unit 4 is accommodated and left in the mounting cavity 221.

[0020] Specifically, the outside of the mass block 21 is covered with a coating member 22, and the pole core 23 and magnetic steel 24 are inserted into a mounting cavity 221 formed inside the mass block 21. The coating member 22 integrally connects the mass block 21, pole core 23, and magnetic steel 24 to each other using the coating member 22. This coating connection method provides higher stability than conventional welding and eliminates the need for additional equipment, effectively reducing production costs. While the related art generally uses Wu-Ni-Cu / 316L material to synthesize the mass block 21, this embodiment is expensive. However, the stability of the mass block 21 and the pole core 23, magnetic steel 24, and other components is ensured by the injection-molded coating member 22, eliminating the need for welding. This significantly reduces the molding requirements for the mass block 21. In this embodiment, the mass block 21 can be manufactured by pressing a low-cost plate material, significantly reducing the molding costs for the mass block 21.

[0021] In this embodiment, elastic units 3 are provided on opposite sides of the mass block 21, and the elastic units 3 include a spring bearing 31 suspended within the accommodation space and a first fixed block 32 fixed between one end of the spring bearing 31 and the side wall of the housing 1, and a second fixed block 25 is provided between the other end of the spring bearing 31 and the mass block 21. An adhesive accommodating groove 251 is formed around the periphery of the second fixed block 25, and the covering member 22 covers the outer periphery of the second fixed block 25 and fills the adhesive accommodating groove 251, which is advantageous in improving the bonding stability between the covering member 22 and the second fixed block 25.

[0022] Specifically, in this embodiment, the spring retainer 31 may be a long spring piece that is wide at both ends and narrow in the middle. The number of spring retainers 31 located on the same side of the mass block 21 may be one or more, preferably two. In this embodiment, a welding block is provided between the ends of two parallel spring retainers 31 on the same side, and the two spring retainers 31 on the same side are welded to the welding block. A stopper piece 33 is provided below the center of the spring retainer 31 and is fixed to the base housing 11 within the housing 1. The thickness of the stopper piece 33 is greater than the height from the center of the spring retainer 31 to the base housing 11 but less than the height from the end of the spring retainer 31 to the base housing 11. The first fixed block 32 and the second fixed block 25 are located at diagonal positions of the spring retainer 31, and the two second fixed blocks 25 connected to opposite sides of the mass block 21 are also located at diagonal positions of the mass block 21. In this embodiment, the driving unit 4 generates a driving potential, causing the entire vibration unit 2 to vibrate back and forth in the direction in which the two elastic units 3 are located, thereby realizing vibration sound generation.

[0023] 1 and 2, in one embodiment of this example, the covering member 22 includes a first covering portion 223 that covers the mass block 21 and a second covering portion 224 that is connected to the outside of the first covering portion 223, and the second covering portion 224 covers the outside of the second fixed block 25 and the outside of the corresponding end of the spring bearing 31. The covering member 22 not only covers the outside of the mass block 21, but also covers the periphery of the second fixed block 25 and the outside of one end of the spring bearing 31 that is connected to the second fixed block 25. This allows the mass block 21, magnetic steel 24, pole core 23, and spring bearing 31 to be connected together by injection coating alone, simplifying the assembly molding operation.

[0024] As shown in FIG. 3, in another embodiment of this embodiment, the second fixed block 25 is fixed to the outside of the mass block 21 and protrudes outside the covering member 22, and the outer end surface of the second fixed block 25 is welded and fixed to the elastic unit 3. That is, even if the mass block 21 and the second fixed block 25 and the second fixed block 25 and the spring holder 31 are both fixed by welding, a stable connection between the elastic unit 3 and the vibration unit 2 can be similarly achieved.

[0025] In this embodiment, the drive unit 4 includes a bobbin 43 fixed to the housing 1, a coil 41 wound around the bobbin 43, and an FPC unit 42 fixed to the housing 1 and electrically connected to the coil 41, with a gap between the magnet steel 24 and the coil 41. The coil 41 generates an alternating current, which cuts the magnetic induction lines of the magnet steel 24 and generates an induced potential, which drives the elastic unit 3 to move.

[0026] In this embodiment, the mounting cavity 221 has at least two sub-cavities 2211 that are arranged in sequence and communicate with each other, formed inside the covering member 22, and one pole core 23 is fixed between two adjacent sub-cavities 2211, magnetic steel 24 is fixed to each side inner wall of each sub-cavity 2211, and a drive unit 4 is provided inside each sub-cavity 2211.

[0027] Specifically, this embodiment is applicable to a multi-magnetic circuit structure (e.g., a two-magnetic circuit structure, a three-magnetic circuit structure, etc.), and the number of coils 41 in different magnetic circuit structures corresponds to the number of sub-cavities 2211. A two-magnetic circuit structure as shown in the drawings is as follows: a coil 41 is fixed in each sub-cavity 2211 via a bobbin 43, and one magnetic steel 24 is fixed to the side wall of each sub-cavity 2211, so that the coil 41 is surrounded by the magnetic steel 24. Note that this embodiment is also applicable to a single-magnetic circuit structure, in which one coil 41 is fixed in the mounting cavity 221, and it is only necessary to fix the pole cores 23 and the magnetic steel 24 correspondingly to the four side walls of the mounting cavity 221 without the need to divide the sub-cavities 2211.

[0028] In this embodiment, the covering member 22 fixes the pole core 23 and the magnet steel 24 by adhesive curing or heat curing.

[0029] Specifically, in one embodiment, the pole core 23 and the corresponding magnetic steel 24 are adhesively fixed, and then the pole core 23 and the magnetic steel 24 are inserted together at corresponding positions in the mounting cavity 221, and then adhesive is applied to the corresponding connection points of the pole core 23, the magnetic steel 24, and the covering member 22, so that the desired elastic component can be obtained after hardening. In another embodiment, the pole core 23 and the magnetic steel 24 are inserted at corresponding positions in the mounting cavity 221, and then the covering member 22 is heat-treated to integrate the pole core 23, the magnetic steel 24, and the covering member 22, so that the desired elastic component can be obtained after hardening. These two methods are used to achieve mutual fixation between the mass block 21, the pole core 23, and the magnetic steel 24, which provides high fixation stability and is advantageous for improving product reliability. Note that the pole core 23 and the corresponding magnetic steel 24 may be fixed before being inserted into the mounting cavity 221, or may be inserted into the mounting cavity 221 and then fixed.

[0030] 1, 3 and 5, in this embodiment, a positioning portion 222 extending from a side wall into the mounting cavity 221 is provided in the mounting cavity, and a positioning notch 2221 is opened in the positioning portion 222, and a positioning protrusion 231 is formed protruding from each end of the pole core 23, and the positioning protrusion 231 is fitted into the corresponding positioning notch 2221. Two adjacent positioning portions 222 form a positioning groove 222a at an interval, and the magnet steel 24 is fitted into the positioning groove 222a. That is, the shape of the positioning notch 2221 matches the shape of the positioning protrusion 231, and the shape of the positioning groove 222a matches the shape of the magnet steel 24. In the process of inserting the magnetic core and the magnet steel 24 into the mounting cavity 221 from one end where the positioning notch 2221 is located, the pole core 23, the magnet steel 24 and the mounting cavity 221 are subsequently adhesively or thermally fixed together, so that the positioning groove 222a and the positioning notch 2221 can accurately determine the fixing positions of the magnet steel 24 and the pole core 23.

[0031] The above is merely an embodiment of the present application, and as should be pointed out here, those skilled in the art may make improvements without departing from the creative concept of the present application, all of which fall within the scope of protection of the present application.

Claims

1. A vibration exciter comprising: a housing having an accommodation space; a vibration unit suspended in the accommodation space; an elastic unit connected to the vibration unit and accommodated in the accommodation space; and a drive unit fixed to the housing for driving vibration of the vibration unit, the vibration unit includes an annular mass block, a covering member covering the outside of the mass block and forming an attachment cavity therein, a pole core connected to the covering member and positioned inside the attachment cavity, and a magnet steel fixed to the pole core, and the drive unit is housed and left in the attachment cavity. A vibration exciter characterized by:

2. the elastic units are provided on opposite sides of the mass block, each elastic unit comprising a spring bearing suspended within the accommodation space and a first fixed block fixed between one end of the spring bearing and a side wall of the housing, and the vibration unit further comprises a second fixed block fixed between the other end of the spring bearing and the mass block; 2. The vibration exciter according to claim 1.

3. the covering member includes a first covering portion that covers the outside of the mass block, and a second covering portion that protrudes from the outside of the first covering portion, and the second covering portion covers the outside of the second fixed block and the outside of the other end of the spring bearing.

3. The vibration exciter according to claim 2.

4. the second fixing block is fixed to the outside of the mass block, and an outer end surface of the second fixing block is welded to the elastic unit.

3. The vibration exciter according to claim 2.

5. the mounting cavity includes at least two sub-cavities formed inside the covering member, arranged in sequence and communicating with each other, one of the pole cores is fixed between two adjacent sub-cavities, the magnet steel is fixed to each side inner wall of each of the sub-cavities, and the drive unit is provided inside each of the sub-cavities.

2. The vibration exciter according to claim 1.

6. the drive unit includes a bobbin fixed to the housing, a coil wound around the bobbin, and an FPC unit fixed to the housing and electrically connected to the coil, and there is a gap between the magnet steel and the coil.

6. The vibration exciter according to claim 5.

7. The covering member is fixed to the pole core and the magnetic steel by adhesive curing or heat curing, respectively.

2. The vibration exciter according to claim 1.

8. A positioning portion is provided in the mounting cavity, extending from a side wall into the cavity, and a positioning notch is formed in the positioning portion. Positioning protrusions are protruded from both ends of the pole core, and the positioning protrusions are fitted into the corresponding positioning notches.

2. The vibration exciter according to claim 1.

9. Two adjacent positioning portions are spaced apart to form positioning grooves, and the magnet steel is fitted into the positioning grooves.

9. The vibration exciter according to claim 8.

10. an adhesive containing groove formed around the periphery of the second fixed block, and the covering member covering the outer periphery of the second fixed block and filling the adhesive containing groove; 3. The vibration exciter according to claim 2.

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