Sound Pronunciation Device

Abstract

The present invention provides a sound producing device. [Solution] A sound generating device comprising a frame, a vibration system fixed to the frame, and a magnetic circuit system that drives the vibration system to vibrate and generate sound, the magnetic circuit system having a magnetic gap in which a main magnet steel and a sub-magnet steel are spaced apart, the vibration system having a diaphragm fixed to the frame, and a voice coil at least a portion of which is inserted into the magnetic gap and drives the diaphragm to vibrate and generate sound, the voice coils each having a ring shape, a first voice coil and a second voice coil, one end of the first voice coil is fixed to the side of the diaphragm close to the magnetic circuit system, the second voice coil is fixed to one end of the first voice coil close to the magnetic circuit system, and the first voice coil and the second voice coil are insulated from each other. The sound generating device according to the present invention allows the position of the voice coil to be adjusted, and has good acoustic performance.

Description

[Technical field]

[0001] The present invention relates to the field of electroacoustic transduction, in particular to sound producing devices. [Background technology]

[0002] 2. Description of the Related Art As one of the main components of mobile terminals such as mobile phones, sound generation devices are primarily used to convert electrical signals into audio signals, and can also be used in earphones.

[0003] A sound generation device of the related art comprises a frame, a vibration system fixed to the frame, and a magnetic circuit system having a magnetic gap, the vibration system having a diaphragm fixed to the frame and used for vibration sound generation, and a voice coil inserted into the magnetic gap to drive the diaphragm to vibrate.

[0004] However, in the sound producing devices of the related art, the voice coil needs to be supported by a bobbin, and the structure in which the bobbin is fixed makes it impossible to adjust the position of the voice coil in the magnetic gap relative to the magnetic circuit system, and such a design is disadvantageous in maximizing the BL of the voice coil in the magnetic circuit system, which affects the sound producing effect of the sound producing device.

[0005] 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]

[0006] An object of the present invention is to provide a sound generating device in which the position of the voice coil can be adjusted so as to maximize the BL of the voice coil. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the sound production device provided by the present invention comprises a frame, a vibration system fixed to the frame, and a magnetic circuit system that drives the vibration system to vibrate and produce sound, the magnetic circuit system having a magnetic gap in which a main magnet steel and a sub-magnet steel are spaced apart, the vibration system having a diaphragm fixed to the frame, and a voice coil at least a portion of which is inserted into the magnetic gap and drives the diaphragm to vibrate and produce sound, the voice coil having a first voice coil and a second voice coil both of which are annular, one end of the first voice coil is fixed to the side of the diaphragm closer to the magnetic circuit system, the second voice coil is fixed to one end of the first voice coil closer to the magnetic circuit system, and the first voice coil and the second voice coil are insulated from each other.

[0008] Preferably, the first voice coil and the second voice coil have an integrally wound structure.

[0009] Preferably, the second voice coil is formed by taking over from the winding end point of the first voice coil and continuing the winding coaxially.

[0010] Preferably, a projection of the second voice coil onto a plane parallel to the vibration direction of the diaphragm is covered by a projection of the main magnet steel onto a plane parallel to the vibration direction of the diaphragm.

[0011] Preferably, the thickness of the first voice coil is smaller than the thickness of the second voice coil in a direction perpendicular to the vibration direction of the diaphragm.

[0012] Preferably, the diaphragm has a ring-shaped fixed portion fixed to the frame, a surround portion fixed to the inner periphery of the fixed portion, and a dome fixed to the inner periphery of the surround portion, and the first voice coil is fixed to the side of the dome facing the magnetic circuit system.

[0013] Preferably, the sound-producing device further includes an air vent spacer, the magnetic circuit system further includes a magnetic bowl, the main magnet steel and the sub-magnet steel are fixed to the magnetic bowl, and the magnetic bowl has air vent holes opposite each other, and the air vent spacer covers the air vent holes. Effect of the Invention

[0014] Compared with the related art, the voice coil in the sound generating device of the present invention has a first voice coil and a second voice coil, both of which are annular, one end of the first voice coil is fixed to the side of the diaphragm close to the magnetic circuit system, the second voice coil is fixed to one end of the first voice coil close to the magnetic circuit system, and the first voice coil and the second voice coil are insulated from each other. Instead of the conventional voice coil bobbin structure, the first voice coil is designed to support the second voice coil, so that the number of turns of the first voice coil can be flexibly adjusted to adjust the position of the second voice coil in the magnetic gap along the vibration direction of the diaphragm, and the second voice coil can maximize the BL in the magnetic circuit, effectively improving the acoustic performance. [Brief description of the drawings]

[0015] 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 the structure of 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 cross-sectional view taken along line AA of FIG. [Figure 4] FIG. 4 is a diagram showing the structure of a voice coil according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be described below clearly and completely with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by those skilled in the art without making inventive efforts based on the embodiments of the present invention shall be included in the protection scope of the present invention.

[0017] 1 to 4, a sound production device 100 provided in an embodiment of the present invention includes a frame 1, a vibration system 2, and a magnetic circuit system 3. The sound production device 100 includes a frame 1, a vibration system 2, and a magnetic circuit system 3. The frame 1 includes a vibration system 2 and a magnetic circuit system 3. The vibration system 2 and the magnetic circuit system 3 are arranged in a circular cross section.

[0018] The magnetic circuit system 3 includes a magnetic bowl 31 fixed to the frame 1, a magnet steel 32 and a sub-magnet steel 33 housed and fixed in the magnetic bowl 31, and the magnet steel 32 is spaced apart from the sub-magnet steel 33 to form a magnetic gap 34. In one possible embodiment, the sub-magnet steel 33 further includes a first sub-magnet steel 331, a second sub-magnet steel 332, a third sub-magnet steel 333, and a fourth sub-magnet steel 334, and the first sub-magnet steel 331, the second sub-magnet steel 332, the third sub-magnet steel 333, and the fourth sub-magnet steel 334 are spaced apart around the magnet steel 32 to form the magnetic gap 34.

[0019] Among them, the first sub-magnetic steel 331 and the second sub-magnetic steel 332 are covered with the magnetic permeable plate 35 , and the magnetic permeable plate 35 is fixed to the frame 1 .

[0020] The magnetic bowl 31 is further provided with a ventilation hole 311 , and the ventilation spacer 6 covers the ventilation hole 311 .

[0021] Specifically, the magnet steel 32 further includes a first main magnet steel 321 and a second main magnet steel 322, and the magnetic pole core 5 is sandwiched between the first main magnet steel 321 and the second main magnet steel 322.

[0022] The vibration system 2 has a diaphragm 21 fixed to the frame 1 and a voice coil 22 that drives the diaphragm 21 to vibrate and produce sound, and at least a portion of the voice coil 22 is inserted into the magnetic gap 34.

[0023] The voice coil 22 has a first voice coil 221 having one end fixed to the side of the diaphragm 21 closer to the magnetic circuit system 3, and a second voice coil 222 having one end fixed to the end of the first voice coil 221 closer to the magnetic circuit system 3, and the first voice coil 221 and the second voice coil 222 are insulated from each other.

[0024] The diaphragm 21 further has a ring-shaped fixed portion 211 fixed to the frame 1, a surround portion 212 fixed to the inner periphery of the fixed portion 211, and a dome 213 fixed to the inner periphery of the surround portion 212, and the first voice coil 221 is fixed to the side of the dome 213 facing the magnetic circuit system 3.

[0025] Specifically, in an embodiment of the present invention, the voice coil 22 is formed by winding a continuous conductive wire, and has an overall hollow coil structure and height, the voice coil 22 is inserted into the magnetic gap 34, the conductive member 4 is electrically connected to the voice coil 22, and when electricity is applied between the conductive member 4 and the voice coil 22, it drives the diaphragm 21 by electromagnetic reaction to realize an acoustic effect, and preferably, the conductive member 4 is an FPC.

[0026] The first voice coil 221 and the second voice coil 222 have an integrally wound structure.

[0027] The second voice coil 222 is formed by continuing the winding coaxially from the end point of the winding of the first voice coil 221. With this design, the first voice coil 221 functions as a voice coil bobbin, and the second voice coil 222 is formed by continuing the winding around the bobbin structure of the first voice coil 221. In the overall configuration of the voice coil 22, the second voice coil 222 is used for electrical drive, and at this time, the conductor of the first voice coil 221 and the conductor of the second voice coil 222 are insulated from each other.

[0028] The projection of the second voice coil 222 onto a plane parallel to the vibration direction of the diaphragm 21 is covered by the projection of the main magnet steel 32 onto a plane parallel to the vibration direction of the diaphragm 21 so that the second voice coil 222 can be adjusted to a certain position within the magnetic gap 34. Specifically, by controlling the number of turns when winding the first voice coil 221, the length by which the second voice coil 222 is inserted into the magnetic gap 34 can be adjusted.

[0029] Specifically, the voice coil 22 forms an electromagnetic field by a structure inserted in the magnetic gap 34. In the embodiment of the present invention, the first voice coil 221 is connected to the diaphragm 21, and the second voice coil 222 is connected to the first voice coil 221, which corresponds to the first voice coil 221 being a support structure between the second voice coil 222 and the diaphragm 21. In this case, by adjusting the winding height of the first voice coil 221 according to the position of the magnetic gap 34, the overall position of the second voice coil 222 in the magnetic gap 33 can be adjusted, and the BL of the second voice coil 222 in the magnetic circuit system 3 can be maximized.

[0030] Preferably, in a direction perpendicular to the vibration direction of the diaphragm 21, the thickness of the first voice coil 221 is smaller than the thickness of the second voice coil 222.

[0031] Specifically, in an embodiment of the present invention, the first voice coil 221 is only a support structure for the second voice coil 222, and in the sound production process of the entire sound production device 100, the only structure in the voice coil 22 that is used for passing current and providing a driving effect to the diaphragm is the second voice coil 222, so that the width of the second voice coil 222 is increased to enhance the acoustic effect.

[0032] Compared with the related art, the voice coil 22 in the sound production device 100 of the present invention has a first voice coil 221 and a second voice coil 222, both of which are annular, one end of the first voice coil 221 is fixed to the side of the diaphragm 21 close to the magnetic circuit system 3, the second voice coil 222 is fixed to one end of the first voice coil 221 close to the magnetic circuit system 3, and the first voice coil 221 and the second voice coil 222 are insulated from each other. Instead of the conventional voice coil bobbin structure, the first voice coil 221 is designed to support the second voice coil 222, so that the number of turns of the first voice coil 221 can be flexibly adjusted to adjust the position of the second voice coil 222 in the magnetic gap 34 along the vibration direction of the diaphragm, and the second voice coil 222 can maximize the BL in the magnetic circuit, effectively improving the acoustic performance.

[0033] 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. [Explanation of symbols]

[0034] 100: Sound device 1: Frame 2: Vibration system 21: Vibration plate 211: Fixed part 212: Surround section 213: Dome 22: Voice coil 221: 1st voice coil 222: 2nd voice coil 3: Magnetic circuit system 31: Magnetic Bowl 311: Ventilation hole 32: Main magnet steel 321: 1st main magnet steel 322:Second main magnet steel 33: Sub-magnet steel 331: 1st sub magnet steel 332:Second sub magnet steel 333: 3rd sub magnet steel 334: 4th sub magnet steel 34: Magnetic gap 35: Permeable plate 4: Conductive material 5:Magnetic pole core 6: Ventilated spacer

Claims

1. A sound generating device comprising a frame, a vibration system and a magnetic circuit system each fixed to the frame, the magnetic circuit system driving the vibration system to vibrate and generate sound, the magnetic circuit system having a magnetic gap formed by providing a space between a main magnet steel and a sub magnet steel, the vibration system having a diaphragm fixed to the frame, and a voice coil at least a portion of which is inserted into the magnetic gap and drives the diaphragm to vibrate and generate sound, The voice coil includes a first voice coil and a second voice coil, both of which are annular. one end of the first voice coil is directly fixed to a side of the diaphragm close to the magnetic circuit system, the second voice coil is fixed to one end of the first voice coil close to the magnetic circuit system, The first voice coil and the second voice coil are insulated from each other. A sound generation device characterized by:

2. The first voice coil and the second voice coil have an integrally wound structure. The sound generating device according to claim 1 .

3. The second voice coil is formed by continuing the winding end point of the first voice coil and winding it coaxially. The sound generating device according to claim 2 .

4. a projection of the second voice coil onto a plane parallel to the vibration direction of the diaphragm is covered by a projection of the main magnet steel onto a plane parallel to the vibration direction of the diaphragm; The sound generating device according to claim 1 .

5. In a direction perpendicular to the vibration direction of the diaphragm, a thickness of the first voice coil is smaller than a thickness of the second voice coil. The sound generating device according to claim 1 .

6. the diaphragm has an annular fixed portion fixed to the frame, a surround portion fixed to an inner periphery of the fixed portion, and a dome fixed to an inner periphery of the surround portion, The first voice coil is fixed to a side of the dome facing the magnetic circuit system. The sound generating device according to claim 1 .

7. The sound generating device further comprises a ventilation spacer; The magnetic circuit system further comprises a magnetic bowl; the primary magnet steel and the secondary magnet steel are fixed to the magnetic bowl; The magnetic bowl is provided with air vents facing each other, The ventilation spacer covers the ventilation hole. The sound generating device according to claim 1 .

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