CN202818589U - Micro sounding device - Google Patents

Abstract

The utility model provides a miniature sound-generating device, which includes a vibration system and a magnetic circuit system. The vibration system includes a diaphragm and a voice coil, and the diaphragm includes a dome top and a collar portion. The magnetic circuit system includes a lower plate, a first magnet part placed on the lower plate, and a second magnet part arranged around the first magnet part and separated from it by a certain distance. At least one of the first magnet part and the second magnet part is a permanent magnet, a magnetic gap is formed between the first magnet part and the second magnet part, and the voice coil is suspended on the magnet within the gap. Wherein, the ring part of the diaphragm is fixed on the magnetic circuit system and the ball top is separated from the first magnet part by a certain distance, and the orthographic projection plane of the diaphragm does not exceed the outline of the lower plate scope. Compared with the related art, the miniature sound generating device of the utility model has higher sensitivity and better acoustic performance.

Description

micro sound device

【Technical field】

The utility model relates to a sounding device. In particular, it relates to a miniature sound-generating device used in the field of portable electronic products.

【Background technique】

In the process of rapid development of mobile phones and other portable devices, people have increasingly strong requirements for the functionality of products, especially for the music appreciation function of mobile phones, the sound quality of the sound is the focus of people's pursuit, so , The development of micro-sounding devices used in portable devices has also accelerated accordingly.

The miniature sound-generating device in the related art includes a frame, a vibration system and a magnetic circuit system fixed on the frame. The vibration system includes a diaphragm fixed on the frame; the magnetic circuit system includes a magnetic bowl fixed on the frame and a magnetic steel inside the magnetic bowl.

However, the micro-sounding device of the related art occupies a large space because of its frame, so that under the premise of a certain volume of the whole micro-sounding device, the volume of its magnetic circuit system is greatly limited, thereby making the sensitivity of the micro-sounding device of the related art performance is limited.

Therefore, it is really necessary to provide a micro-sounding device with a new structure to overcome the above-mentioned problems.

【Content of utility model】

The technical problem to be solved by the utility model is to provide a micro-sounding device with high sensitivity.

According to the above-mentioned technical problem, a kind of micro-sounding device is designed, and its purpose is to realize like this: A kind of micro-sounding device, it comprises vibration system and magnetic circuit system. The vibration system includes a vibrating membrane and a voice coil for driving the vibrating membrane, and the vibrating membrane includes a spherical top and a ring portion bent and extended from the spherical top. The magnetic circuit system includes a lower plate, a first magnet part placed in the center of the lower plate, and a second magnet part arranged around the first magnet part with a certain distance therefrom, the first magnet part and the At least one of the second magnet parts is a permanent magnet. A magnetic gap is formed between the first magnet part and the second magnet part, and the voice coil is suspended in the magnetic gap. Wherein, the ring part of the diaphragm is fixed on the magnetic circuit system and the ball top is separated from the first magnet part by a certain distance, and the orthographic projection plane of the diaphragm does not exceed the outline of the lower plate scope.

Preferably, there are several second magnet parts and each second magnet part is not connected to each other, and the magnetic circuit system also includes an annular second pole piece attached to the second magnet part .

Preferably, the micro sound-generating device further includes a ring-shaped spacer arranged on the second pole piece, and the ring portion of the diaphragm is fixed on the spacer.

Preferably, the collar part includes a recessed part recessed away from the second pole piece and a fixing part extending from the recessed part, and the fixing part is fixed on the gasket.

Preferably, the second pole piece is integrated with the gasket.

Preferably, the second pole piece is higher than the first magnet part in a direction perpendicular to the lower plate, and the ring part of the diaphragm is fixed on the second pole piece.

Preferably, the collar portion includes a recessed portion that is recessed away from the second pole piece and a fixing portion extending from the depression, and the fixing portion is fixed on the second pole piece.

Preferably, there are four second magnet parts.

Preferably, the magnetic circuit system further includes a first pole piece attached to the first magnet part, and the ball top is separated from the first pole piece by a certain distance.

Preferably, the miniature sound-generating device further includes a front cover covering the diaphragm, and the front cover is provided with a sound-emitting hole penetrating therethrough.

Compared with the related art, the miniature sound generating device of the utility model has high sensitivity and excellent acoustic performance.

【Description of drawings】

Fig. 1 is a three-dimensional structural view of the first embodiment of the micro-sounding device of the present invention.

Fig. 2 is an exploded view of the three-dimensional structure of the first embodiment of the micro-sounding device of the present invention.

Fig. 3 is a sectional view along line A-A in Fig. 1 .

Fig. 4 is a schematic structural diagram of the second embodiment of the micro-sounding device of the present invention.

Fig. 5 is a schematic diagram of the first magnetic circuit structure of the micro-sounding device of the present invention.

Fig. 6 is a schematic diagram of the second magnetic circuit structure of the micro-sounding device of the present invention.

Fig. 7 is a schematic diagram of the third magnetic circuit structure of the micro-sounding device of the present invention.

【Detailed ways】

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in FIGS. 1-3 , a micro sound-generating device 10 includes a vibration system 1 and a magnetic circuit system 2 . The vibration system 1 includes a diaphragm 11 and a voice coil 12 that drives the diaphragm 11 to vibrate. The diaphragm 11 includes a ball top 111 and a ring portion 112 bent and extended from the ball top 111 . The magnetic circuit system 2 includes a lower plate 21, a first magnet part 221 placed in the center of the lower plate 21, a second magnet part 222 arranged around the first magnet part 221 and at a certain distance therefrom, the first magnet part 221 and the second magnet At least one of the parts 222 is a permanent magnet. This structure forms a magnetic gap (not labeled) between the first magnet part 221 and the second magnet part 222 , and the voice coil 12 is suspended in the magnetic gap through the diaphragm 11 . In this embodiment, both the first magnet part 221 and the second magnet part 222 are permanent magnets. The second magnet part 222 can be a ring-shaped whole or a split structure. Specifically, in the micro-sounding device 10 of the present utility model, the second magnet part 222 is set to several and each second magnet part 222 is connected to each other. The unconnected split structures are specifically set to four here. The orthographic projection surface of the diaphragm 11 does not exceed the contour range of the lower plate 21 , that is, the orthographic projection area of the diaphragm 11 is smaller than or equal to the area of the lower plate 21 .

In the present invention, the so-called magnetic circuit system refers to a combination of components that can generate a magnetic field, and the generated magnetic field can be affected by components in the system.

The so-called lower plate is not limited to a plate shape, but can also be a bowl-shaped body with side walls, that is, with a flat plate and a side wall extending from the flat plate, as long as it has a bottom plate for placing a magnet part (such as a magnetic steel). It is the lower board.

The orthographic projection plane mentioned in the utility model refers to the projection plane perpendicular to the direction of the lower plate 21 . Certainly, the area of said lower plate 21 in the miniature sounding device 10 of the present utility model refers to the area of the surface surrounded by its outer contour on the horizontal plane when the lower plate 21 is placed horizontally, rather than the actual area of the lower plate 21 itself .

More preferably, the micro sound-generating device 10 is further provided with an annular second pole piece 232 attached to the second magnet part 222 . Of course, the second pole piece 232 can also be arranged in several separate structures that are not connected to each other following the shape of the second magnet part 222 .

The utility model micro-sounding device 10 does not have a frame structure, therefore, the ring portion 112 of the diaphragm 11 is fixed on the magnetic circuit system 2, the voice coil 12 is suspended in the magnetic gap, and the ball top 111 is connected to the second magnetic gap. A magnet portion 221 is separated by a certain distance, thereby providing a vibration space for the diaphragm 11 . Therefore, the ring part 112 of the diaphragm 11 can be fixed on the second pole piece 232, or it can be fixed on the second magnet part 222, as long as the voice coil 12 can be suspended in the magnetic gap to make the diaphragm 11 To vibrate means to keep the ball top 111 and the first magnet part 221 at a certain distance. The miniature sounding device 10 of the present utility model can also be provided with a front cover 3 covering the diaphragm 11, and the front cover 3 is provided with a sounding hole 31 passing through it.

The fixing method of the vibrating membrane 11 of the miniature sounding device 10 of the present utility model is further explained with two specific embodiments, the first embodiment:

As shown in FIGS. 2-3 , specifically, the micro sound-generating device 10 further includes an annular spacer 24 disposed on the second pole piece 232 , and the ring portion 112 of the vibrating membrane 11 is fixed on the spacer 24 . Due to the setting of the gasket 24, the fixed position of the diaphragm 11 is higher than the position of the first magnet part 221, so that the spherical top 111 of the diaphragm 11 is separated from the first magnet part 221 by a certain distance, that is, the diaphragm 11 provides vibration space. Of course, in this embodiment, the magnetic circuit system 2 can also be provided with the first pole piece 231 attached to the first magnet part 221, and the spacer 24 makes the position where the diaphragm 11 is fixed higher than the position of the first pole piece 231. , so that the ball top 111 and the first pole piece 231 are separated by a certain distance.

In this embodiment, the diaphragm 11 is fixed on the spacer 24 , and the spacer 24 is located on the second pole piece 232 , that is to say, the diaphragm 11 is indirectly fixed on the second pole piece 232 through the spacer 24 . The miniature sounding device 10 of the utility model has no basin structure, simplified assembly process, and under the same volume, its magnetic circuit system 2 can be maximized, which greatly improves the drive of the magnetic circuit system 2. force, thereby improving the sensitivity of the micro-sounding device 10 and improving its acoustic performance.

In order to improve the reliability of the micro sound-generating device 10 to a greater extent, in this embodiment, more preferably, the ring portion 112 includes a recessed portion 1121 recessed away from the second pole piece 232 and a fixing portion extending from the recessed portion 1121 1122 , the fixing part 1122 is fixed on the washer 24 . The concave portion 1121 provides a larger vibration space for the diaphragm 11 , further preventing the diaphragm 11 from colliding with the first pole piece 231 when vibrating. Certainly, in this embodiment, the second pole piece 231 and the gasket 24 may also be integrally structured.

The second embodiment, as shown in Figure 4, the second embodiment of the miniature sounding device 10 of the present utility model is roughly the same as the first embodiment, the difference is: the magnetic circuit system of the miniature sounding device 10 in this embodiment 2 No gasket 24 is provided, the second pole piece 232 is higher than the first magnet portion 221 in the direction perpendicular to the lower plate 21, and the ring portion 112 of the diaphragm 11 is directly fixed on the second pole piece 232. Because the second pole piece 232 is higher than the first magnet portion 221, when the ring portion 112 is fixed on the second pole piece 232 so that the ball top 111 is separated from the first magnet portion 221 by a certain distance, vibration is provided for the ball top 111. space. Specifically, the diaphragm 11 is directly fixed on the second pole piece 232 through the fixing part 1122 of the ring part 112 . Of course, in this embodiment, the magnetic circuit system 2 can also be provided with the first pole piece 231 attached to the first magnet part 221, and the second pole piece 232 is higher than the first pole piece in the direction perpendicular to the lower plate 21. 231, make the ball top 111 and the first pole piece 231 be separated by a certain distance.

In the miniature sounding device 10 of the present invention, because at least one of the first magnet part 221 and the second magnet part 222 is a permanent magnet, there are three structures as follows:

Referring to FIG. 5 , both the first magnet part 221 and the second magnet part 222 are permanent magnets.

Referring to FIG. 6 , the first magnet part 221 is a permanent magnet, and the second magnet part 222 is a non-permanent magnet.

Referring to FIG. 7 , the second magnet part 222 is a permanent magnet, and the first magnet part 221 is a non-permanent magnet.

Of course, in the above three structures, pole pieces can be attached to both the first magnet part 221 and the second magnet part 222 , or only one of them can be attached, which is all feasible.

Compared with related technologies, the miniature sounding device of the utility model saves the basin structure, which makes the assembly process simple, and in the same volume of products, the magnetic circuit system of the miniature sounding device of the utility model can be maximized, greatly The driving force of the magnetic circuit system is improved, thus the sensitivity of the miniature sound-generating device of the utility model is improved, and the acoustic performance is improved. In addition, in order to enhance the driving force of the magnetic circuit, the micro-sounding device of the related art only enlarges the magnetic circuit system, but must have a frame structure. However, the miniature sounding device of the utility model omits the basin frame structure, makes the magnetic circuit system larger under the same volume, and overcomes the technical prejudice.

What has been described above is only the embodiment of the utility model, and it should be pointed out that for those of ordinary skill in the art, improvements can also be made without departing from the inventive concept of the utility model, but these all belong to Protection scope of the present utility model.

Claims (10)

1. mini-sound device, its involving vibrations system and magnetic circuit system, described vibrational system comprises vibrating diaphragm and drives the voice coil loudspeaker voice coil of described vibrating diaphragm vibration, described vibrating diaphragm comprises ball top and the ring section of being extended by the bending of described ball top, described magnetic circuit system comprises lower plate and places the first magnet portion of described lower plate central authorities and around described the first magnet portion setting and second magnet portion separated by a distance with it, have at least one to be permanent magnet in described the first magnet portion and described the second magnet portion, form magnetic gap between described the first magnet portion and described the second magnet portion, described voice coil loudspeaker voice coil is suspended in the described magnetic gap, it is characterized in that: the ring section of described vibrating diaphragm be fixed on the described magnetic circuit system and described ball top and described the first magnet portion separated by a distance, the frontal plane of projection of described vibrating diaphragm does not exceed the profile scope of described lower plate.

2. mini-sound device according to claim 1 is characterized in that: described the second magnet portion is made as several and each described second magnet portion does not link to each other mutually, and described magnetic circuit system also comprises ring-type the second pole piece that is sticked on described the second magnet portion.

3. mini-sound device according to claim 2, it is characterized in that: described mini-sound device also comprises the pad that is arranged on the ring-type on described the second pole piece, the ring section of described vibrating diaphragm is fixed on the described pad.

4. mini-sound device according to claim 3 is characterized in that: described ring section comprises that to away from the depressed part of described the second pole piece direction depression and the fixed part that is extended by described depressed part, described fixed part is fixed on the described pad.

5. mini-sound device according to claim 4, it is characterized in that: described the second pole piece and described pad are structure as a whole.

6. mini-sound device according to claim 2, it is characterized in that: described the second pole piece is higher than described the first magnet portion in the direction perpendicular to described lower plate, and the ring section of described vibrating diaphragm is fixed on described the second pole piece.

7. mini-sound device according to claim 6 is characterized in that: described ring section comprises that to away from the depressed part of described the second pole piece direction depression and the fixed part that is extended by described depressed part, described fixed part is fixed on described the second pole piece.

8. according to claim 5 or 7 described mini-sound devices, it is characterized in that: described the second magnet portion is provided with four.

9. mini-sound device according to claim 8, it is characterized in that: described magnetic circuit system also comprises the first pole piece that is sticked on described the first magnet portion, described ball top and described the first pole piece are separated by a distance.

10. mini-sound device according to claim 9 is characterized in that: described mini-sound device comprises that also lid is located at the protecgulum on the described vibrating diaphragm, and described protecgulum is provided with the vocal hole that runs through on it.

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