CN103024648A - Sound production device - Google Patents

Abstract

The invention provides a sound-generating device, which comprises a frame, a magnetic bowl accommodated in the frame, a magnetic steel attached to the magnetic bowl, and a diaphragm fixed on the frame. The magnetic bowl includes a bottom wall, and the magnetic steel includes a main magnetic steel attached to the bottom wall and a ring-shaped auxiliary magnetic steel arranged around the main magnetic steel. The basin frame, the magnetic bowl and the vibrating membrane together form an inner cavity. The basin frame also includes a sound guide tube arranged at its end away from the diaphragm, and the sound guide tube communicates with the inner cavity. Wherein, the auxiliary magnetic steel is provided with several notches, at least one of which is directly connected to the sound guide tube, and the sound wave generated by the vibration of the diaphragm can be emitted from the sound guide tube through the notches. Compared with related technologies, the sound generating device of the invention has better sensitivity and better acoustic performance.

Description

Sound device

【Technical field】

The invention relates to a sounding device, in particular to a sounding device used in the field of portable communication devices.

【Background technique】

With the rapid development of wireless communication, there are more and more mobile phones around the world. People's requirements for mobile phones are not limited to basic calls, but also put forward more requirements for the appearance and voice quality of traditional mobile phones. The sound generating device used in mobile phones has become one of the most important components.

Traditional mobile phones such as the sound-generating devices of mobile phones, such as loudspeakers, receivers, etc., are arranged on the top of the mobile phone, that is, on the top of the display screen, and a sound hole is set at the top position, and the sound passes through the sound hole. This design not only increases the length of the mobile phone due to the placement of the loudspeaker, but also is not conducive to the development of large-screen mobile phones, which limits the area of the screen and restricts the flexible placement of other electronic components inside the mobile phone. Therefore, an improved sound-generating device appeared again.

The sound-generating device in the related art includes a pot frame, a magnetic bowl accommodated in the pot frame, a magnetic steel attached to the magnetic bowl and a diaphragm fixed on the pot frame, and the magnetic steel includes a main magnet Steel and auxiliary magnetic steel set around the main magnetic steel, the basin frame, magnetic bowl and diaphragm form an inner cavity, the bottom of the basin frame is also provided with a sound guide tube, one end of the sound guide tube is connected The inner cavity communicates with the other end, and the other end communicates with the outside world. The projection of the sound guide tube toward the diaphragm at least partially overlaps with the diaphragm. The sound emitting device in the related art emits sound through the sound guide tube at the bottom to form a sound emitting structure on the back, so that when the sound emitting device is applied to portable communication devices such as mobile phones, its position can be set flexibly.

However, in order to maximize the driving force of the sound-generating device in the related art, its auxiliary magnetic steel is provided with a ring-shaped closed structure, and the orthographic projection of the sound guide tube to the diaphragm does not overlap with the magnetic bowl, which makes the vibration When the sound wave generated by membrane vibration reaches the sound guide tube through the inner cavity, the sound wave in the magnetic gap will be hindered by the secondary magnet and cannot be transmitted to the sound guide tube, thus limiting its sensitivity and other acoustic performance.

Therefore, it is necessary to propose a new sound generating device to solve the above technical problems.

【Content of invention】

The technical problem to be solved by the present invention is to provide a sound generating device with stronger driving force and better acoustic performance.

According to the above-mentioned technical problems, a sound-generating device is designed, and its purpose is to be achieved as follows: a sound-generating device, which includes a frame, a magnetic bowl accommodated in the frame, and a magnetic bowl attached to the magnetic bowl. Magnetic steel and the diaphragm fixed on the basin frame. The magnetic bowl includes a bottom wall, and the magnetic steel includes a main magnetic steel attached to the bottom wall and a ring-shaped auxiliary magnetic steel arranged around the main magnetic steel. The basin frame, the magnetic bowl and the vibrating membrane together form an inner cavity. The basin frame also includes a sound guide tube arranged at its end away from the diaphragm, and the sound guide tube communicates with the inner cavity. Wherein, the auxiliary magnetic steel is provided with several notches, at least one of which is directly connected to the sound guide tube, and the sound waves generated by the vibration of the diaphragm are emitted from the sound guide tube through the notches.

Preferably, the orthographic projection of the sound guide tube to the bottom wall of the magnetic bowl at least partially overlaps with the bottom wall, and the position on the bottom wall overlapped by the orthographic projection of the sound guide tube is provided with a The opening on the top communicates with the notch.

Preferably, the orthographic projection of the sound guide tube toward the bottom wall of the magnetic bowl at least overlaps with the notch directly communicating with the sound guide tube.

Preferably, there are two notches, and the two notches are symmetrical about the geometric center of the main magnet.

Compared with related technologies, the sound generating device of the invention has better sensitivity and better acoustic performance.

【Description of drawings】

Fig. 1 is an exploded view of the three-dimensional structure of the sound emitting device of the present invention.

Fig. 2 is a three-dimensional structure diagram of the sound emitting device of the present invention.

Fig. 3 is a sectional view along line A-A in Fig. 2 .

Fig. 4 is a three-dimensional structure diagram of the magnetic circuit system of the sound emitting device of the present invention.

【Detailed ways】

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in FIGS. 1-4 , a sound-generating device 10 includes a frame 1 , a vibration system 2 and a magnetic circuit system 3 accommodated in the frame 1 . The vibration system 2 includes a diaphragm 21 fixed on the basin frame 1 and a voice coil 22 driving the diaphragm 21 to vibrate. The magnetic circuit system 3 includes a magnetic bowl 31 and a magnetic steel 32 attached to the magnetic bowl 31 . Specifically, the magnetic bowl 31 includes a bottom wall 311, and the magnetic steel 32 includes a main magnetic steel 321 attached to the bottom wall 311 and an annular auxiliary magnetic steel 322 arranged around the main magnetic steel 321. The auxiliary magnetic steel 322 is sleeved on the A magnetic gap (not labeled) is formed on the main magnetic steel 321 and the main magnetic steel 321 , and the voice coil 22 is suspended in the magnetic gap. The secondary magnetic steel 322 is arranged in a ring shape, which enhances the driving force of the magnetic circuit system 3 to the greatest extent and improves the acoustic performance of the sound-generating device 10 .

In the sound generating device 10 of the present invention, the frame 1 , the magnetic bowl 31 and the diaphragm 21 together form an inner cavity (not labeled). The basin frame 1 also includes a sound guide tube 4 arranged at its end away from the diaphragm 21, that is, the sound guide tube 4 is arranged at the bottom of the basin frame 1 and the sound guide tube 4 communicates with the inner cavity, so as to realize sound output from the back of the sound emitting device 10 structure. The sound waves generated by the vibration of the diaphragm 21 are transmitted to the inner cavity, and are sent out from the sound guide tube 4 through the inner cavity. At this time, the auxiliary magnetic steel 322 is a closed structure because of its ring shape. The range of the auxiliary magnetic steel 322, especially the magnetic gap The internal sound waves cause a certain obstruction, which in turn affects the acoustic properties such as the sensitivity of the sound-generating device 10 . Therefore, the sound generating device 10 of the present invention is provided with several notches 3221 on the secondary magnetic steel 322 , and at least one of the notches 3221 communicates directly with the sound guide tube 4 . The part of the sound wave generated by the diaphragm 21 reaching the magnetic gap can pass through the notch 3221 to reach the sound guide tube 4 without hindrance, and then emit from the sound guide tube 4, so that the sensitivity of the sound generator 40 of the present invention is higher and the acoustic performance is better . More preferably, the orthographic projection of the sound guide tube 4 to the bottom wall 311 of the magnetic bowl 31 at least overlaps with the notch 3221 directly communicating with the sound guide tube 4 , that is, the notch 3221 directly communicating with the sound guide tube 4 is completely or completely At least partially within the range of the orthographic projection described above. So that sound waves can reach the sound guide tube 4 more smoothly.

In this embodiment, the bottom wall 311 is provided with a through opening 3111, and the opening 3111 communicates with the notch 3221 and the sound guide tube 4 respectively. Specifically, the sound guide tube 4 is arranged at the bottom of the basin frame 1. The orthographic projection to the bottom wall 311 direction of the magnetic bowl 31 overlaps with the bottom wall 311 at least in part, and the opening 3111 is arranged on the bottom wall 311 at the position where the orthographic projection of the sound guide tube 4 overlaps, and the opening 3111 and the sound guide The notch 3221 directly communicating with the tubes 4 is located opposite and communicating with each other. The setting of the port 3111 makes the sound waves within the range of the auxiliary magnet in the inner cavity, especially the sound waves in the magnetic gap, more smoothly transmitted to the sound guide tube 4, further improving the sensitivity of the sound emitting device 40.

In the sound generating device 10 of the present invention, more preferably, there are two notches 3221 , and the two notches 3221 are symmetrical about the geometric center of the main magnet 321 . This symmetrical structural arrangement can balance the magnetic driving force experienced by the voice coil 22 and optimize the acoustic performance of the sound-generating device 10 . Of course, the opening of the two notches 3221 can make the auxiliary magnetic steel 322 two discontinuous sections, which is equivalent to two completely symmetrical half rings; the auxiliary magnetic steel 322 can also be made as a whole, that is, only One notch 3221 is provided, as long as the notch 3221 can provide an unimpeded transmission path for the sound wave, the principle is the same.

Compared with the related technology, the sounding device of the present invention not only ensures the strong driving force of the main and auxiliary double magnets, but also sets a notch on the auxiliary magnets to minimize the resistance when the sound wave passes through the inner cavity to the sound guide tube. , so that the sensitivity of the sounding device is higher and the acoustic performance is better, and the symmetrical structure of the notch makes the force balance of the voice coil, which further ensures the better acoustic performance of the sounding device.

What has been described above is only the embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of the present invention, but these all belong to the present invention. scope of protection.

Claims (4)

1. microphone device, it comprises the basin frame, be contained in the magnetic bowl in the described basin frame, be sticked on described magnetic bowl magnet steel and be fixed on vibrating diaphragm on the described basin frame, described magnetic bowl comprises diapire, described magnet steel comprises the main magnet steel that is sticked on described diapire and the ringwise secondary magnet steel that arranges around described main magnet steel, described basin frame, magnetic bowl and vibrating diaphragm surround an inner chamber jointly, described basin frame also comprises the phonocatheter that is arranged on away from an end of described vibrating diaphragm, described phonocatheter communicates with described inner chamber, it is characterized in that: described secondary magnet steel is provided with some notch parts, at least one described notch part directly is communicated with described phonocatheter, and the sound wave of described vibrating diaphragm generation of vibration can send from described phonocatheter by this notch part.

2. microphone device according to claim 1, it is characterized in that: described phonocatheter is overlapping at least part of and described diapire of the orthographic projection of the diapire direction of described magnetic bowl, be provided with the port that runs through on it by the overlapping position of described phonocatheter orthographic projection on the described diapire, described port communicates with described notch part.

3. microphone device according to claim 1 is characterized in that: described phonocatheter to the orthographic projection of the diapire direction of described magnetic bowl at least and the described notch part that directly is communicated with described phonocatheter overlapping.

4. according to claim 2 or 3 described microphone devices, it is characterized in that: described notch part is provided with two, and two described notch parts are symmetrical about the geometric center of described main magnet steel.

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