Sound Pronunciation Device

Abstract

The present invention provides a sound producing device. [Solution] The sound generating device includes a frame, a vibration system, and a magnetic circuit system, the vibration system includes a diaphragm and a voice coil fixed to the diaphragm, the magnetic circuit system includes a yoke and a magnet steel fixed to the yoke, the sound generating device further includes a flexible circuit board electrically connecting the voice coil and an external circuit, the flexible circuit board includes a first pad portion connected to the voice coil, a second pad portion electrically connected to the external circuit, and an intermediate connection portion connecting the first pad portion and the second pad portion, the second pad portion being fixed to the frame and located outside the housing space. The second pad portion of the flexible circuit board is installed outside the frame and the flexible circuit board is directly pulled out to form an external pad, which eliminates the need to provide a soldering point in the vibration space inside the frame, frees up design space in the sound generating device, and directly solders to the outside of the frame, which reduces the complexity of the soldering process and effectively improves the yield rate and product reliability.

Description

[Technical field]

[0001] The present invention relates to the field of electroacoustic conversion, in particular to a sound generating device for a portable mobile terminal. [Background technology]

[0002] With the development of portable mobile terminal technology, the requirements for sound effects of portable mobile terminals are increasing. At the same time, as portable mobile terminals become lighter and thinner, sound generating devices also need to keep up with the trend of becoming lighter and thinner.

[0003] A conventional sound generating device generally includes a frame, a vibration system fixed to the frame, and a magnetic circuit system with a magnetic gap, the vibration system includes a diaphragm for vibration sound generation, and a voice coil fixed to the diaphragm for driving the diaphragm, the magnetic circuit system includes a yoke and a magnet steel, the voice coil is inserted into the magnetic gap of the magnetic circuit system, and after electricity is applied, the diaphragm is vibrated back and forth to generate sound. In the prior art, in order to realize power supply to the voice coil, the sound generating device is often provided with a flexible circuit board and a conductive terminal molded in the frame, specifically, the conductive terminal includes an internal pad and an external pad, the voice coil lead wire is electrically connected to the flexible circuit board, the flexible circuit board is electrically connected to the internal pad, and the external pad is electrically connected to the external circuit to form an electrical path, and the soldering points between the flexible circuit board and the internal pad are provided in the frame, which not only occupies the internal design space of the sound generating device, but also makes the soldering process inconvenient.

[0004] Therefore, there is a need to provide a new sound generating device to solve the above technical problems. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide a sound producing device with a larger internal design space and a simpler process. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the sound producing device provided by the present invention comprises a frame having an accommodation space, and a vibration system and a magnetic circuit system having a magnetic gap accommodated within the accommodation space, the vibration system including a diaphragm fixed to the frame, and a voice coil fixed to the diaphragm and inserted into the magnetic gap, the magnetic circuit system including a yoke fixed to the frame, and a magnetic steel fixed to the yoke, the sound producing device further including a flexible circuit board electrically connecting the voice coil and an external circuit, the flexible circuit board including a first pad portion connected to the voice coil, a second pad portion electrically connected to an external circuit, and an intermediate connection portion connecting the first pad portion and the second pad portion, the second pad portion being fixed to the frame and located outside the accommodation space.

[0007] Preferably, the voice coil has a track shape, and the first pad portion is fixed in the minor axis direction of the voice coil and is fixed to an end of the voice coil away from the diaphragm.

[0008] Preferably, the frame includes a main body portion fixed to the diaphragm, the main body portion including a first fixed surface fixed to the diaphragm and a second fixed surface arranged opposite the first fixed surface along the vibration direction, and the second pad portion is fixed to the second fixed surface.

[0009] Preferably, the main body portion includes a first main body portion extending along the long axis direction, a second main body portion extending along the short axis direction, and a connecting corner portion provided at a corner position and connecting the first main body portion and the second main body portion, and the second pad portion is fixed to the connecting corner portion.

[0010] Preferably, the magnet steel includes a main magnet steel fixed at an intermediate position of the yoke, a first edge magnet steel spaced apart from the circumferential side of the main magnet steel along the major axis direction, and a second edge magnet steel spaced apart from the circumferential side of the main magnet steel along the minor axis direction, the first edge magnet steel and the second edge magnet steel forming the magnetic gap with the main magnet steel, a retreat gap being formed between the first edge magnet steel and the second edge magnet steel, the first pad portion being accommodated in the magnetic gap, and the intermediate connection portion extending from the magnetic gap through the retreat gap.

[0011] Preferably, the intermediate connection portion includes a first connection portion extending from the first pad portion and penetrating the retreat gap, a second connection portion bending and extending from the first connection portion to surround the outside of the second edge magnet steel, and a third connection portion extending from the second connection portion and fixed to the second main body portion, and the third connection portion is connected to the second pad portion.

[0012] Preferably, there are two flexible circuit boards, the two flexible circuit boards are provided on the short axis side of the voice coil, and the two second pad portions are fixed to the connection corner portions of the main body portion along a diagonal line.

[0013] Preferably, the sound producing device further includes a conductive terminal fixed to the main body portion, the conductive terminal including three third pad portions, one of which is electrically connected to one of the second pad portions, and the remaining two third pad portions are fixed to the connection corner portions of the main body portion along the other diagonal.

[0014] Preferably, the yoke includes a yoke bottom portion fixed to the main magnet steel, and a yoke flanging bending and extending from an edge of the yoke bottom portion in the short axis direction, the yoke flanging being fixed to the second main body portion, and the third connection portion being sandwiched between the yoke flanging and the second main body portion.

[0015] Preferably, the frame further includes a boss portion extending from an inner edge of the connection corner portion toward the yoke, the second pad portion being provided outside the boss portion, and the boss portion being fixedly connected to a bottom portion of the yoke. Effect of the Invention

[0016] Compared with the prior art, the sound-producing device provided by the present invention includes a frame having an accommodation space, a vibration system accommodated in the accommodation space, and a magnetic circuit system having a magnetic gap, wherein the vibration system includes a diaphragm fixed to the frame and a voice coil fixed to the diaphragm, and the magnetic circuit system includes a yoke fixed to the frame and a magnetic steel fixed to the yoke, and the sound-producing device further includes a flexible circuit board electrically connecting the voice coil and an external circuit, and the flexible circuit board includes a first pad portion connected to the voice coil, a second pad portion electrically connected to an external circuit, and an intermediate connection portion connecting the first pad portion and the second pad portion, and the second pad portion is fixed to the frame and located outside the accommodation space. By installing the second pad portion of the flexible circuit board outside the frame and directly pulling out the flexible circuit board to use as an external pad, there is no need to provide a soldering point within the vibration space inside the frame, freeing up design space within the sound generation device. In addition, since soldering is performed directly outside the frame, the complexity of the soldering process can be reduced and the yield rate and product reliability can be effectively improved. [Brief description of the drawings]

[0017] In order to more clearly describe the technical solutions in the embodiments of the present invention, the drawings necessary for describing the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without any inventive work, among which: [Figure 1] FIG. 1 is a perspective view showing a sound producing device according to the present invention. [Diagram 2]FIG. 2 is an exploded view of the sound producing device according to the present invention. [Diagram 3] FIG. 3 is a perspective view of the sound producing device according to the present invention after the yoke has been removed. [Figure 4] FIG. 4 is a perspective view of the sound producing device according to the present invention from another viewpoint. [Diagram 5] FIG. 5 is a cross-sectional view taken along line AA of FIG. [Figure 6] FIG. 6 is a perspective view of a combination of a flexible circuit board and a conductive terminal of a sound producing device according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention.

[0019] As shown in Figures 1 to 6, the present invention provides a sound producing device 100 including a frame 1 having an accommodation space 10, a vibration system 2 accommodated in the accommodation space 10, and a magnetic circuit system 3 having a magnetic gap 30.

[0020] The vibration system 2 includes a diaphragm 21 fixed to the frame 1, and a voice coil 22 fixed to the diaphragm 21 and inserted in the magnetic gap 30. Specifically, the vibration system 2 further includes a diaphragm fixing member 23 that supports the diaphragm 21 on the frame 1, and a dome 24 fixed to the diaphragm 21, the diaphragm fixing member 23 being fixed to the frame 1, and the diaphragm 21 being fixed to the diaphragm fixing member 23.

[0021] The magnetic circuit system 3 includes a yoke 31 fixed to the frame 1, a magnet steel 32 fixed to the yoke 31, and a magnetic pole core 33 fixed to a surface of the magnet steel 32 away from the yoke 31.

[0022] The sound production device 100 further includes a flexible circuit board 4 electrically connecting the voice coil 22 and an external circuit, the flexible circuit board 4 including a first pad portion 41 connected to the voice coil 22, a second pad portion 42 electrically connected to an external circuit, and an intermediate connection portion 43 connecting the first pad portion 41 and the second pad portion 42, the second pad portion 42 being fixed to the frame 1 and located outside the accommodating space 10.

[0023] Specifically, the voice coil 22 has a track shape, and the first pad portion 41 is fixed to the voice coil 22 in the short axis direction and is fixed to an end of the voice coil 22 away from the diaphragm 21. The frame 1 includes a main body portion 11 fixed to the diaphragm 21, and the main body portion 11 includes a first fixing surface 111 fixed to the diaphragm 21 and a second fixing surface 112 installed opposite the first fixing surface 111 along the vibration direction, and the second pad portion 42 is fixed to the second fixing surface 112. Furthermore, the main body portion 11 includes a first main body portion 113 extending along the long axis direction, a second main body portion 114 extending along the short axis direction, and a connecting corner portion 115 provided at a corner position and connecting the first main body portion 113 and the second main body portion 114, and the second pad portion 42 is fixed to the connecting corner portion 115. That is, as can be understood, the second pad portion 42 is fixed to a surface away from the diaphragm 21 along the vibration direction of the connecting corner portion 115 .

[0024] Specifically, the magnet steel 32 includes a main magnet steel 321 fixed at an intermediate position of the yoke 31, a first edge magnet steel 322 spaced apart from the circumferential side of the main magnet steel 321 along the major axis direction, and a second edge magnet steel 323 spaced apart from the circumferential side of the main magnet steel 321 along the minor axis direction, the first edge magnet steel 322 and the second edge magnet steel 323 forming the magnetic gap 30 with the main magnet steel 321, a retreat gap 324 being formed between the first edge magnet steel 322 and the second edge magnet steel 323, the first pad portion 41 being accommodated in the magnetic gap 30, and the intermediate connection portion 43 extending from the magnetic gap 30 through the retreat gap 324. Correspondingly, the magnetic pole core 33 includes a main magnetic pole core 331 fixed to the main magnet steel 321, and a sub-magnetic pole core 332 fixed to the first edge magnet steel 322 and the second edge magnet steel 323, and as can be understood, the sub-magnetic pole core 332 has an annular structure, the outside of the sub-magnetic pole core 332 is fixed to the frame 1, and the magnetic circuit system 3 is further supported by the frame 1.

[0025] Furthermore, the intermediate connection portion 43 of the flexible circuit board 4 includes a first connection portion 431 extending from the first pad portion 41 and penetrating the withdrawal gap 324, a second connection portion 432 bending and extending from the first connection portion 431 to surround the outside of the second edge magnet steel 323, and a third connection portion 433 extending from the second connection portion 432 and fixed to the second main body portion 114, and the third connection portion 433 is connected to the second pad portion 42.

[0026] As can be seen, there are two flexible circuit boards 4, the two flexible circuit boards 4 are provided on the short axis side of the voice coil 22, and the two second pad portions 42 are fixed to the connection corner portion 115 of the main body portion 11 along a diagonal line.

[0027] The sound production device 100 further includes a conductive terminal 5 fixed to the main body 11, and the conductive terminal 5 includes three third pad portions 51, one of which is electrically connected to one of the second pad portions 42, and the remaining two third pad portions 51 are fixed to the connection corner portion 115 of the main body 11 along the other diagonal line. After the voice coil 22 and the flexible circuit board 4 are electrically connected, they are electrically connected to an external circuit via the conductive terminal 5, thereby achieving power supply to the voice coil 22.

[0028] The yoke 31 includes a yoke bottom 311 fixed to the main magnet steel 321, and a yoke flanging 312 bending and extending from an edge of the yoke bottom 311 in the short axis direction, the yoke flanging 312 being fixed to the second main body portion 114, and the third connection portion 433 being sandwiched between the yoke flanging 312 and the second main body portion 114. The frame 1 further includes a boss portion 116 extending from an inner edge of the connection corner portion 115 toward the yoke 31, the second pad portion 42 being provided on the outer side of the boss portion 116, and the boss portion 116 being fixedly connected to the yoke bottom 311.

[0029] Compared with the prior art, the sound-producing device provided by the present invention includes a frame having an accommodation space, a vibration system accommodated in the accommodation space, and a magnetic circuit system having a magnetic gap, wherein the vibration system includes a diaphragm fixed to the frame and a voice coil fixed to the diaphragm, and the magnetic circuit system includes a yoke fixed to the frame and a magnetic steel fixed to the yoke, and the sound-producing device further includes a flexible circuit board electrically connecting the voice coil and an external circuit, and the flexible circuit board includes a first pad portion connected to the voice coil, a second pad portion electrically connected to an external circuit, and an intermediate connection portion connecting the first pad portion and the second pad portion, and the second pad portion is fixed to the frame and located outside the accommodation space. By installing the second pad portion of the flexible circuit board outside the frame and directly pulling out the flexible circuit board to use as an external pad, there is no need to provide a soldering point within the vibration space inside the frame, freeing up design space within the sound generation device. In addition, since soldering is performed directly outside the frame, the complexity of the soldering process can be reduced and the yield rate and product reliability can be effectively improved.

[0030] The above is merely an embodiment of the present invention, and it should be noted here that those skilled in the art may make modifications without departing from the creative idea of ​​the present invention, and all such modifications are within the scope of protection of the present invention.

Claims

1. A sound generating device comprising: a frame having an accommodation space; and a vibration system and a magnetic circuit system having a magnetic gap housed in the accommodation space, the vibration system includes a diaphragm fixed to the frame, and a voice coil fixed to the diaphragm and inserted in the magnetic gap; the magnetic circuit system includes a yoke fixed to the frame and a magnet steel fixed to the yoke; the sound generating device further includes a flexible circuit board electrically connecting the voice coil and an external circuit, the flexible circuit board including a first pad portion connected to the voice coil, a second pad portion electrically connected to an external circuit, and an intermediate connection portion connecting the first pad portion and the second pad portion, the second pad portion being fixed to the frame and located outside the accommodating space; The voice coil has a track shape, and the first pad portion is fixed in a minor axis direction of the voice coil and is fixed to an end of the voice coil away from the diaphragm, The frame includes a main body portion fixed to the diaphragm, the main body portion includes a first fixing surface fixed to the diaphragm and a second fixing surface installed opposite the first fixing surface along a vibration direction, the second pad portion is fixed to the second fixing surface, the main body portion includes a first main body portion extending along a long axis direction, a second main body portion extending along a short axis direction, and a connection corner portion provided at a corner position and connecting the first main body portion and the second main body portion, the second pad portion being fixed to the connection corner portion, The magnet steel includes a main magnet steel fixed at an intermediate position of the yoke, a first side magnet steel provided at a distance from the circumferential side of the main magnet steel along the long axis direction, and a second side magnet steel provided at the circumferential side of the main magnet steel along the short axis direction, the first side magnet steel and the second side magnet steel form the magnetic gap with the main magnet steel, a retreat gap is formed between the first side magnet steel and the second side magnet steel, the first pad portion is accommodated in the magnetic gap, and the intermediate connection portion extends from the magnetic gap through the retreat gap. A sound generation device characterized by:

2. the intermediate connection portion includes a first connection portion extending from the first pad portion and penetrating the retreat gap, a second connection portion bending and extending from the first connection portion to surround the outside of the second edge magnet steel, and a third connection portion extending from the second connection portion and fixed to the second body portion, the third connection portion being connected to the second pad portion; The sound generating device according to claim 1 .

3. The flexible circuit board is two in number, the two flexible circuit boards are provided on the short axis side of the voice coil, and the two second pad portions are fixed to the connection corner portions of the main body portion along a diagonal line. The sound generating device according to claim 2 .

4. the sound generating device further includes a conductive terminal fixed to the main body portion, the conductive terminal including three third pad portions, one of which is electrically connected to one of the second pad portions, and the remaining two of which are fixed to the connection corner portions of the main body portion along the other diagonal line; 4. The sound generating device according to claim 3.

5. the yoke includes a yoke bottom portion fixed to the main magnet steel, and a yoke flanging bending and extending from an edge of the yoke bottom portion in a short axis direction, the yoke flanging being fixed to the second body portion, and the third connection portion being sandwiched between the yoke flanging and the second body portion.

5. The sound generating device according to claim 4.

6. the frame further includes a boss portion extending from an inner edge of the connection corner portion toward the yoke, the second pad portion being provided outside the boss portion, and the boss portion being fixedly connected to a bottom portion of the yoke.

6. The sound generating device according to claim 5.

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