CN103024649A - 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-generating part disposed at its end away from the diaphragm, and the sound-generating part 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-generating part, and the sound waves generated by the vibration of the diaphragm can be emitted from the sound-generating part 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 the secondary magnetic steel set around the main magnetic steel. The basin frame, magnetic bowl and diaphragm form an inner cavity. The cavity communicates, and the other end communicates with the outside world, and the projection of the sound-generating part toward the diaphragm at least partially overlaps with the diaphragm. The sound emitting device in the related art emits sound through the sound emitting part at the bottom to form a rear sounding structure, so that when the sound emitting device is applied to a portable communication device such as a mobile phone, its position can be set flexibly.

However, in order to maximize the driving force of the sound-generating device in the related art, its secondary magnetic steel is provided with a ring-shaped closed structure, and the orthographic projection of the sound-generating part to the diaphragm does not overlap with the magnetic bowl, which makes the diaphragm When the sound wave generated by the vibration reaches the sounding part through the inner cavity, the sound wave in the magnetic gap will be hindered by the secondary magnet and cannot be transmitted to the sounding part, 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-generating part disposed at its end away from the diaphragm, and the sound-generating part communicates with the inner cavity. Wherein, the secondary magnetic steel is provided with several notches, at least one of the notches is directly connected to the sound-generating part, and the sound waves generated by the vibration of the diaphragm can pass through the notches to reach the vocal part.

Preferably, the orthographic projection of the sounding part toward 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 sounding part is provided with a The opening communicates with the notch.

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

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 frame 1 also includes a sound emitting part 4 arranged at its end away from the diaphragm 21 , that is, the sound emitting part 4 is arranged at the bottom of the frame 1 and communicates with the inner cavity, so as to realize the back sound emitting structure of the sound emitting device 10 . The sound waves generated by the vibration of the diaphragm 21 are transmitted to the inner cavity, and are emitted from the sound-generating part 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 in the magnetic gap The 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 magnet 322 , and at least one notch 3221 communicates directly with the sound-generating part 4 . The sound waves generated by the diaphragm 21, especially the part of the sound waves that reach the magnetic gap, can pass through the notch 3221 to reach the sounding part 4 without hindrance, and then emit from the sounding part 4, so that the sensitivity of the sounder 40 of the present invention is higher, and the acoustic performance is improved. better. More preferably, the orthographic projection of the sounding part 4 to the bottom wall 311 of the magnetic bowl 31 at least overlaps with the notch 3221 directly communicating with the sounding part 4, that is, the notch 3221 directly communicating with the sounding part 4 completely or at least partially falls within the range of the above-mentioned orthographic projection. So that the sound waves can reach the sound generating part 4 more smoothly. In the sound-generating device of the present invention, the sound-generating part 4 can be a sound-emitting hole, and of course it can also be a sound-guiding tube, which are all used to make the sound waves in the inner cavity emit from there.

In this embodiment, the bottom wall 311 is provided with a through opening 3111, and the through opening 3111 communicates with the notch 3221 and the sounding part 4 respectively. The orthographic projection of the direction of the bottom wall 311 of the bowl 31 at least partially overlaps with the bottom wall 311, and the opening 3111 is arranged on the bottom wall 311 at a position where the orthographic projection of the sound emitting part 4 overlaps, and the opening 3111 directly communicates with the sound emitting part 4. The notch portion 3221 is set opposite to and connected with each other. The setting of the port 3111 makes the sound waves within the range of the secondary magnet in the inner cavity, especially the sound waves in the magnetic gap, more smoothly transmitted to the sounding part 4, further improving the sensitivity of the sounding 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 main and auxiliary double magnets of the present invention ensure strong driving force, and at the same time, a notch is set on the auxiliary magnet, which minimizes the resistance when the sound wave passes through the inner cavity to the sound emitting part. 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. A sounding device comprising 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 Including a bottom wall, the magnet includes a main magnet attached to the bottom wall and a ring-shaped secondary magnet surrounding the main magnet, and the basin frame, the magnetic bowl and the diaphragm jointly form a An inner cavity, the frame also includes a sounding part arranged at an end far away from the diaphragm, the sounding part communicates with the inner cavity, and it is characterized in that: the auxiliary magnetic steel is provided with several notches, At least one of the notches is directly connected to the sound-generating part, and the sound wave generated by the diaphragm vibration can reach the sound-generating part through the notch after passing through the inner cavity. 2. The sound-generating device according to claim 1, characterized in that: the orthographic projection of the sound-generating part toward the bottom wall of the magnetic bowl at least partially overlaps with the bottom wall, and the part on the bottom wall is covered by the The position where the orthographic projections of the sounding parts overlap is provided with a through hole, and the through hole communicates with the notch. 3 . The sound-generating device according to claim 1 , wherein the orthographic projection of the sound-generating portion toward the bottom wall of the magnetic bowl at least overlaps with the notch directly communicating with the sound-generating portion. 4 . 4. The sound emitting device according to claim 2 or 3, characterized in that there are two notches, and the two notches are symmetrical about the geometric center of the main magnet.

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