CN111641906B - Sound production device - Google Patents

Sound production device Download PDF

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Publication number
CN111641906B
CN111641906B CN202010588033.8A CN202010588033A CN111641906B CN 111641906 B CN111641906 B CN 111641906B CN 202010588033 A CN202010588033 A CN 202010588033A CN 111641906 B CN111641906 B CN 111641906B
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CN
China
Prior art keywords
magnetic
yoke
magnetic steel
diaphragm
voice coil
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Expired - Fee Related
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CN202010588033.8A
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Chinese (zh)
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CN111641906A (en
Inventor
肖波
令狐荣林
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AAC Technologies Pte Ltd
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AAC Technologies Pte Ltd
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Priority to CN202010588033.8A priority Critical patent/CN111641906B/en
Priority to PCT/CN2020/102772 priority patent/WO2021258440A1/en
Publication of CN111641906A publication Critical patent/CN111641906A/en
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Publication of CN111641906B publication Critical patent/CN111641906B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

The invention provides a sounding device which comprises a vibration system and a magnetic circuit system, wherein the vibration system comprises an upper vibrating diaphragm, a voice coil, a lower vibrating diaphragm and a framework, the magnetic circuit system comprises a magnetic yoke and first magnetic steel, the magnetic yoke comprises a magnetic yoke body and a magnetic yoke supporting table, the first magnetic steel is fixed on the magnetic yoke body, the voice coil is arranged on the outer side of the first magnetic steel in a surrounding manner, and the magnetic yoke supporting table is arranged on the inner side of the first magnetic steel; the framework comprises a framework body and a framework extension part, wherein the framework body is connected with the upper vibrating diaphragm and the lower vibrating diaphragm and extends to the inner side of the first magnetic steel; the lower vibrating diaphragm is arranged on the inner side of the first magnetic steel and connected between the framework body and the magnetic yoke support platform; the first magnetic steel is provided with a fracture penetrating through the first magnetic steel, and the framework extension part penetrates through the fracture and is fixed on the voice coil. Compared with the prior art, the lower vibrating diaphragm of the sounding device has long service life and high reliability.

Description

Sound production device
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of electroacoustic conversion, in particular to a sounding device applied to an electronic sound box product.
[ background of the invention ]
With the advent of the mobile internet age, the number of smart mobile devices is increasing. Among the mobile devices, the mobile phone is undoubtedly the most common and portable mobile terminal device. At present, the functions of mobile phones are very diverse, one of them is a high-quality music function, and therefore, a sound generating device for playing sound is widely applied to the current smart mobile devices.
The sound production device in the related art comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system and the magnetic circuit system are respectively fixed on the basin frame; vibration system is including being fixed in the last vibrating diaphragm of basin frame, being fixed in go up the vibrating diaphragm and insert and locate the magnetic gap is in order to drive the voice coil loudspeaker voice coil of vibrating diaphragm vibration sound production, with go up the relative lower vibrating diaphragm that sets up of vibrating diaphragm and connect respectively go up the vibrating diaphragm with the skeleton of lower vibrating diaphragm, the one end of lower vibrating diaphragm is fixed in the basin frame, the other end is fixed in the voice coil loudspeaker voice coil is kept away from the lower vibrating diaphragm of vibrating diaphragm one end.
However, in the sound production device in the related art, the lower diaphragm is fixed in the two opposite ends of the voice coil, although the lower diaphragm can effectively prevent the lateral swing during the vibration of the voice coil, the lower diaphragm is clamped in the basin frame and the space between the voice coils is small, so that the vibration space of the lower diaphragm is small, and under the condition of ultra-large amplitude (Xmax >1.0mm), the vibration amplitude of the lower diaphragm is limited, so that the service life of the lower diaphragm is short, and in addition, the stability of the voice coil is poor, so that the reliability of the sound production device is poor.
Therefore, there is a need to provide a new sound generation device to solve the above technical problems.
[ summary of the invention ]
The invention aims to provide a sounding device with long service life and high reliability of a lower vibrating diaphragm.
In order to achieve the above object, the present invention provides a sound generating device, which includes a vibration system and a magnetic circuit system for driving the vibration system to vibrate and generate sound, wherein the vibration system includes an upper vibrating diaphragm for vibrating and generating sound, a voice coil for driving the upper vibrating diaphragm to vibrate and generate sound, a lower vibrating diaphragm arranged opposite to the upper vibrating diaphragm at an interval, and a framework arranged between the upper vibrating diaphragm and the lower vibrating diaphragm, the magnetic circuit system includes a magnetic yoke arranged opposite to the upper vibrating diaphragm at an interval and a first magnetic steel fixed on the magnetic yoke, the magnetic yoke includes a magnetic yoke body and a magnetic yoke support platform extending from the magnetic yoke body to the upper vibrating diaphragm in a protruding manner, the first magnetic steel is fixed on the magnetic yoke body, the voice coil is arranged around the outer side of the first magnetic steel, and the magnetic yoke is arranged inside the first magnetic steel support platform; the framework comprises a framework body which is connected with the upper vibrating diaphragm and the lower vibrating diaphragm and extends to the inner side of the first magnetic steel, and a framework extension part which extends from the framework body to the voice coil; the lower vibrating diaphragm is arranged on the inner side of the first magnetic steel and connected between the framework body and the magnetic yoke support platform; the first magnetic steel comprises a plurality of adjacent first magnetic steels, a fracture is formed at an interval between the adjacent first magnetic steels, and the framework extension part penetrates through the fracture and is fixed on the voice coil.
Preferably, the magnetic circuit system further comprises a second magnetic steel fixed to the magnetic yoke body, the second magnetic steel is arranged outside the first magnetic steel and forms a magnetic gap with the first magnetic steel at an interval, and the voice coil is inserted into the magnetic gap.
Preferably, the skeleton extension include by the skeleton body to the skeleton extension body that the direction of voice coil loudspeaker voice coil extends, by the skeleton extension body to the first canned paragraph of skeleton that the direction of yoke was buckled to extend and by the first canned paragraph of skeleton is to keeping away from the skeleton second canned paragraph that the direction of skeleton body was buckled to extend, the first canned paragraph of skeleton is fixed in the voice coil loudspeaker voice coil is close to one side of first magnet steel, the skeleton second canned paragraph is fixed in the voice coil loudspeaker voice coil is close to the one end of yoke.
Preferably, the magnetic yoke support platform is rectangular, the number of the first magnetic steels is four, two first magnetic steels are arranged on two opposite sides of the magnetic yoke support platform at intervals, and the other two first magnetic steels are arranged on the other two opposite sides of the magnetic yoke support platform at intervals; the skeleton extension includes four, and each skeleton extension passes an adjacent fracture.
Preferably, the voice coil is a rectangle with round corners, and the four framework extension parts are respectively connected to the positions of the four round corners of the voice coil.
Preferably, the sound production device further comprises a basin frame for respectively supporting the vibration system and the magnetic circuit system, the upper vibration diaphragm, the basin frame, the framework body, the lower vibration diaphragm and the magnetic circuit system jointly enclose a first inner sound cavity, the upper vibration diaphragm, the framework body, the lower vibration diaphragm and the magnet yoke supporting table jointly enclose a second inner sound cavity, the framework body is provided with a leakage hole penetrating through the framework body, and the second inner sound cavity is communicated with the first inner sound cavity through the leakage hole.
Preferably, the leakage hole includes a plurality of leakage holes, and the plurality of leakage holes are spaced apart from each other.
Preferably, the lower diaphragm is annular, the lower diaphragm includes a first lower fixing portion fixed to the yoke support table, a downward-folded ring portion bent and extended from an outer peripheral edge of the first lower fixing portion, and a second lower fixing portion bent and extended from an outer peripheral edge of the downward-folded ring portion toward the first magnetic steel, and the framework body is fixed to the second lower fixing portion.
Preferably, the magnetic yoke support platform comprises a support platform plate arranged opposite to the upper vibrating diaphragm and a support platform side wall bent and extended from the outer periphery of the support platform plate to the magnetic yoke body, the support platform side wall is connected to the magnetic yoke body and forms a gap with the first magnetic steel at an interval, the first lower fixing part is fixed to the support platform plate, and the lower folded ring part is recessed towards the direction close to the magnetic yoke body and is accommodated in the gap.
Preferably, the magnetic circuit system further comprises a first clamping plate stacked on the first magnetic steel, a second clamping plate stacked on the second magnetic steel, and an auxiliary magnetic steel stacked on the second clamping plate, wherein the second magnetic steel and the auxiliary magnetic steel are oppositely arranged in the same polarity, and the magnetic pole opposite in the same polarity is opposite to the magnetic pole on one side, close to the first clamping plate, of the first magnetic steel.
Compared with the prior art, the sounder of the invention arranges the magnetic yoke of the magnetic circuit system on the magnetic yoke support platform protruding towards the direction of the upper vibrating diaphragm, and arranges the magnetic yoke support platform on the inner side of the first magnetic steel, the voice coil is arranged on the outer side of the first magnetic steel in a surrounding manner, the first magnetic steel is provided with a fracture, the framework body of the framework is connected with the upper vibrating diaphragm and the lower vibrating diaphragm and extends to the inner side of the first magnetic steel, the framework extension part of the framework passes through the fracture and is fixed on the voice coil, meanwhile, the lower vibrating diaphragm is arranged on the inner side of the first magnetic steel and is connected between the framework body and the magnetic yoke support platform, the structure enables the lower vibrating diaphragm to be accommodated in the space enclosed by the first magnetic steel, and compared with the space enclosed by the basin frame and the voice coil, the lower vibrating diaphragm is arranged in the space enclosed by the first magnetic, make the long service life of vibrating diaphragm down to reach and prevent horizontal swing when the voice coil loudspeaker voice coil vibrates is effectual, thereby makes the sound production device stability good.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic perspective view of a sound device according to the present invention;
FIG. 2 is an exploded perspective view of a sound device according to the present invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 1;
FIG. 4 is a schematic view of a three-dimensional assembly structure of the sound device of the present invention with a yoke removed;
FIG. 5 is a schematic view of a three-dimensional assembly structure of an upper diaphragm, a lower diaphragm, a voice coil and a frame of a sound device according to the present invention;
FIG. 6 is a schematic perspective view of a skeleton of a sound device according to the present invention;
fig. 7 is a schematic perspective view of a yoke of a sound producing device according to the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a sound generating device 100, which includes a vibration system 2 and a magnetic circuit system 3, wherein the magnetic circuit system 3 drives the vibration system 2 to vibrate and generate sound. The magnetic circuit 3 is embodied with a magnetic gap 30.
In this embodiment, the sounder device 100 further includes a frame 1 for supporting the vibration system 2 and the magnetic circuit system 3, respectively.
The vibration system 2 is fixed on the basin frame 1. Specifically, the vibration system 2 includes an upper vibrating diaphragm 21 fixed on the basin frame 1 and used for vibrating and sounding, a voice coil 22 inserted in the magnetic gap 30 to drive the upper vibrating diaphragm 21 to vibrate and sound, a lower vibrating diaphragm 23 arranged at an interval relative to the upper vibrating diaphragm 21, and a framework 24 arranged between the upper vibrating diaphragm 21 and the lower vibrating diaphragm 23.
In this embodiment, the upper diaphragm 21 includes an upper fixing portion 211 fixed to the frame 1, an upper ring-folding portion 212 bent and extended to be annular from a periphery of the upper fixing portion 211, an upper vibrating portion 213 bent and extended from the upper ring-folding portion 212 in a direction away from the upper fixing portion 211, and a dome 214 attached and fixed to the upper vibrating portion 213, the upper vibrating portion 213 is provided with a first through hole 210 penetrating through the upper vibrating portion, and the dome 214 covers the first through hole 210.
In this embodiment, the magnetic circuit system 3 includes a magnetic yoke 31 disposed opposite to the upper diaphragm 21 at an interval, and a first magnetic steel 32 and a second magnetic steel 33 fixed to the magnetic yoke 31, respectively, where the second magnetic steel 33 and the first magnetic steel 32 form the magnetic gap 30 at an interval.
The yoke 31 includes a yoke body 311 and a yoke support 312 formed by the yoke body 311 extending in a direction of the upper diaphragm 21.
In this embodiment, the yoke support 312 is located in the middle of the yoke body 311. The first magnetic steel 32 and the second magnetic steel 33 are respectively fixed to the yoke body 311, and the second magnetic steel 33 is disposed outside the first magnetic steel 32 and spaced from the first magnetic steel 32 to form the magnetic gap 30. The first magnetic steel 32 is annular. The yoke support 312 is disposed inside the first magnetic steel 32. This structure enables a space to be formed between the first magnetic steel 32 and the yoke support 312, and enables the first magnetic steel 32 to form an annular structure, which is beneficial to increase the space of the magnetic gap 30 of the magnetic circuit system 3 and improve the acoustic performance of the sound generating device 100.
In order to realize the simultaneous vibration of the upper diaphragm 21 and the lower diaphragm 23, the bobbin 24 is fixed to the voice coil 22, the upper diaphragm 21, and the lower diaphragm 23, respectively. Specifically, the bobbin 24 includes a bobbin body 241 connecting the upper diaphragm 21 and the lower diaphragm 23 and extending to the inner side of the first magnetic steel 32, and a bobbin extension 242 extending from the bobbin body 241 to the voice coil 22.
One end of the skeleton body 241 is fixed to the upper diaphragm 21, and the other end of the skeleton body 241 is fixed to the lower diaphragm 23. In this embodiment, the skeleton body 241 is fixed to the dome 214.
The lower diaphragm 23 is disposed inside the first magnetic steel 32 and connected between the frame body 241 and the yoke support table 312. In this embodiment, the lower diaphragm 23 is annular. Specifically, the outer side of the lower diaphragm 23 is fixed to one end of the skeleton body 241 away from the upper diaphragm 21, and the inner side of the lower diaphragm 23 is fixed to the yoke support 312. Compared with the lower vibrating diaphragm 23 of the related art, which is arranged in the space between the frame 1 and the voice coil 22, the lower vibrating diaphragm 23 is arranged in the space surrounded by the first magnetic steel 32, so that the lower vibrating diaphragm 23 can be designed to be relatively large. Under the condition of the ultra-large amplitude (Xmax >1.0mm) of the lower vibrating diaphragm 23, the vibrating space of the lower vibrating diaphragm 23 is large, so that the lower vibrating diaphragm 23 has long service life, and simultaneously, the effect of preventing the voice coil 22 from transversely swinging during vibration is good, so that the sound generating device 100 has good stability.
In this embodiment, the frame body 241 is annular and surrounds the yoke support base 312. Specifically, the frame body 241 includes a body sidewall 2411 disposed between the first magnetic steel 32 and the yoke support platform 312 at an interval, a first reinforcing wall 2412 bent and extended from one end of the body sidewall 2411 close to the upper diaphragm 21, and a second reinforcing wall 2413 bent and extended from one end of the body sidewall 2411 close to the lower diaphragm 23, where the first reinforcing wall 2412 is fixed to the upper diaphragm 21, and the second reinforcing wall 2413 is fixed to the lower diaphragm 23. By providing the first reinforcing wall 2412 and the second reinforcing wall 2413 on the skeleton body 241, this structure increases the coupling strength of the first reinforcing wall 2412 and the upper diaphragm 21 and the coupling strength of the second reinforcing wall 2413 and the lower diaphragm 23 by increasing the bonding area, thereby improving the vibration reliability of the upper diaphragm 21 and the lower diaphragm 23.
The voice coil 22 is disposed around the outside of the first magnetic steel 32. In order to fix the bobbin 24 to the voice coil 22, the first magnetic steel 32 is provided with a fracture 320 extending therethrough, and the bobbin extension 242 extends into the magnetic gap 30 through the fracture 320 and is fixed to the voice coil 22 so as to elastically suspend the voice coil 22 below the upper diaphragm 21. The voice coil 22 drives the bobbin 24 to drive the upper diaphragm 21 and the lower diaphragm 23 to vibrate simultaneously.
Specifically, the bobbin extension 242 includes a bobbin extension body 2421 extending from the bobbin body 241 to the direction of the voice coil 22, a first bobbin fixing section 2422 extending from the bobbin extension body 2421 to the direction of the magnetic yoke 31 in a bending manner, and a second bobbin fixing section 2423 extending from the first bobbin fixing section 2422 to the direction away from the bobbin body 241 in a bending manner, wherein the first bobbin fixing section 2422 is fixed to the side of the voice coil 22 close to the first magnetic steel 32, and the second bobbin fixing section 2423 is fixed to the end of the voice coil 22 close to the magnetic yoke 31. This structure can make the fixation more firm and improve the reliability by fixing the first bobbin fixing section 2422 and the second bobbin fixing section 2423 to the two surfaces connected to the voice coil 22 at the same time, and on the other hand, can make the voice coil 22 adjust the height in the vibration direction of the diaphragm 21 by the support of the bobbin fixing section 243, so that the amplitude of the simultaneous vibration of the upper diaphragm 21 and the lower diaphragm 23 is driven to be larger, and the acoustic effect of the sound generating device 100 is improved.
In this embodiment, the magnetic yoke supporting platform 312 is rectangular, the first magnetic steels 32 include four, two first magnetic steels 32 are arranged at intervals on two opposite sides of the magnetic yoke supporting platform 312, and two first magnetic steels 32 are arranged at intervals on two other opposite sides of the magnetic yoke supporting platform 312, the second magnetic steels 33 include four, two second magnetic steels 33 are arranged at intervals on two opposite sides of the first magnetic steels 32, and two other second magnetic steels 33 are arranged at intervals on two other opposite sides of the first magnetic steels 32. The frame body 241 is annular and surrounds the yoke support platform 312. The two adjacent first magnetic steels 32 form the break 320 at an interval, the number of the skeleton extensions 242 is four, and each skeleton extension 242 extends into the magnetic gap 30 through one break 320. This structure can form a larger space in the first magnetic steel 32 under the condition of ensuring that the magnetic circuit performance of the magnetic circuit system 3 is basically unchanged, and the space can accommodate the lower diaphragm 23.
In this embodiment, the voice coil 22 is a rectangle with rounded corners, the bobbin fixing portions 243 include four, and the four bobbin extending portions 242 are respectively connected to four rounded corners of the voice coil 22. That is, the bobbin extension 242 is fixed to the rounded corner of the voice coil 22, which is advantageous for recycling the space of the magnetic circuit system 3 and for assembly.
In this embodiment, the lower diaphragm 23 includes a first lower fixing portion 231 fixed to the yoke support table 312, a folded-down portion 232 folded and extended from an outer peripheral edge of the first lower fixing portion 231, and a second lower fixing portion 233 extended from an outer peripheral edge of the folded-down portion 232 toward the first magnetic steel 32. The lower folded ring portion 232 and the second lower fixing portion 233 are spaced apart from the yoke body 311. The first lower fixing portion 231 is provided with a second through hole 230 penetrating therethrough, and the yoke support 312 covers the second through hole 230. The frame body 241 is fixed to the second lower fixing portion 233. This structure fixes the lower diaphragm 23, and the volume of the lower diaphragm 23 can also be maximized.
In this embodiment, the upper diaphragm 21, the frame 1, the skeleton body 241, the lower diaphragm 23, and the magnetic circuit system 3 jointly enclose a first inner acoustic cavity 101, the upper diaphragm 21, the skeleton body 241, the lower diaphragm 23, and the yoke support table 312 jointly enclose a second inner acoustic cavity 102, the skeleton body 241 is provided with a leakage hole 240 penetrating through the skeleton body, and the second inner acoustic cavity 102 is communicated with the first inner acoustic cavity 101 through the leakage hole 240. Preferably, the leakage hole 240 includes a plurality of holes, and the plurality of leakage holes 240 are spaced apart from each other. The arrangement of the leakage hole 240 is beneficial to the air pressure balance between the first internal acoustic cavity 101 and the second internal acoustic cavity 10, so that the amplitude of the simultaneous vibration of the upper diaphragm 21 and the lower diaphragm 23 is larger, the vibration of the lower diaphragm 23 is more effective, and the service life of the lower diaphragm 23 is also prolonged.
In this embodiment, the yoke support table 312 includes a support table 3121 disposed opposite to the upper diaphragm 21, and a support table side wall 3122 extending from an outer peripheral edge of the support table 3121 in a direction of the yoke body 311, and the support table side wall 3122 is connected to the yoke body 311 and forms a gap 301 with the first magnetic steel 32. The first lower fixing portion 231 is fixed to the support base plate 3121, and the lower hinge portion 232 is recessed in a direction approaching the yoke body 311 and is accommodated in the gap 301. This structure makes the lower folded ring portion 232 of the lower diaphragm 23 for vibrating have a larger vibration space in the space 301, and a better vibration effect is achieved.
In this embodiment, the yoke body 311 includes a first avoiding groove 302 and a second avoiding groove 303 formed by a side direction of the upper diaphragm 21 away from the upper diaphragm 21, the first avoiding groove 302 is disposed in the magnetic gap 30, and the structure makes the vibration amplitude of the voice coil 22 larger, thereby improving the reliability. The second avoiding groove 303 is disposed in the gap 301, so that the vibration amplitude of the downward-folded ring portion 232 of the lower diaphragm 23 is larger, and the reliability is improved.
In this embodiment, the magnetic circuit system 3 further includes a first clamping plate 34 stacked on the first magnetic steel 32 and a second annular clamping plate 35 stacked on the second magnetic steel 33; the number of the first clamping plates 34 is four, and each first clamping plate 34 is overlapped on one adjacent first magnetic steel 32; the second clamping plate 35 further comprises two first bodies 351 arranged oppositely and two second bodies 352 connected between the first bodies 351 on the adjacent sides, and the second bodies 352 are fixed on the basin stand 1. This structure forms external magnetic circuit, and this magnetic circuit structure makes first magnet steel 32, first splint 34, second magnet steel 33 and second splint 35 form magnetic gap 30 is great, and it is better to go up the ascending height in vibration direction of vibrating diaphragm 21, thereby makes voice coil 22's vibration range is big, has effectively improved magnetic circuit's magnetic field intensity simultaneously, has promoted magnetic circuit's magnetic drive power and symmetry, thereby has strengthened acoustic performance and reliability of vocal ware 100.
In this embodiment, the magnetic circuit system 3 further includes an auxiliary magnetic steel 36 stacked on the second clamping plate 35, the second magnetic steel 33 and the auxiliary magnetic steel 36 are arranged in a homopolar manner, and the magnetic pole opposite to the homopolar direction is opposite to the magnetic pole on the side of the first magnetic steel 32 close to the first clamping plate 34. The auxiliary magnetic steels 36 include four auxiliary magnetic steels 36, two auxiliary magnetic steels 36 are stacked on the two opposite first bodies 351, and the other two auxiliary magnetic steels 36 are stacked on the two opposite second bodies 352. The voice coils 22 are arranged inside the auxiliary magnetic steel 36 at intervals, the structure enables the auxiliary magnetic steel 36 to improve the driving force of the magnetic circuit system 3, and the arrangement of the auxiliary magnetic steel 36 can maximize the structural volume of the magnetic circuit system 3 to the greatest extent, so as to maintain the magnetic field intensity.
Compared with the prior art, the sounder of the invention arranges the magnetic yoke of the magnetic circuit system on the magnetic yoke support platform protruding towards the direction of the upper vibrating diaphragm, and arranges the magnetic yoke support platform on the inner side of the first magnetic steel, the voice coil is arranged on the outer side of the first magnetic steel in a surrounding manner, the first magnetic steel is provided with a fracture, the framework body of the framework is connected with the upper vibrating diaphragm and the lower vibrating diaphragm and extends to the inner side of the first magnetic steel, the framework extension part of the framework passes through the fracture and is fixed on the voice coil, meanwhile, the lower vibrating diaphragm is arranged on the inner side of the first magnetic steel and is connected between the framework body and the magnetic yoke support platform, the structure enables the lower vibrating diaphragm to be accommodated in the space enclosed by the first magnetic steel, and compared with the space enclosed by the basin frame and the voice coil, the lower vibrating diaphragm is arranged in the space enclosed by the first magnetic, make the long service life of vibrating diaphragm down to reach and prevent horizontal swing when the voice coil loudspeaker voice coil vibrates is effectual, thereby makes the sound production device stability good.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A sound production device comprises a vibration system and a magnetic circuit system for driving the vibration system to vibrate and produce sound, wherein the vibration system comprises an upper vibrating diaphragm for vibrating and producing sound, a voice coil for driving the upper vibrating diaphragm to vibrate and produce sound, a lower vibrating diaphragm arranged opposite to the upper vibrating diaphragm at intervals and a framework arranged between the upper vibrating diaphragm and the lower vibrating diaphragm, the magnetic circuit system comprises a magnetic yoke arranged opposite to the upper vibrating diaphragm at intervals and a first magnetic steel fixed on the magnetic yoke,
the magnetic yoke comprises a magnetic yoke body and a magnetic yoke supporting table which is extended from the magnetic yoke body to the direction of the upper vibrating diaphragm in a protruding mode, the first magnetic steel is fixed to the magnetic yoke body, the voice coil is arranged on the outer side of the first magnetic steel in a surrounding mode, and the magnetic yoke supporting table is arranged on the inner side of the first magnetic steel;
the framework comprises a framework body which is connected with the upper vibrating diaphragm and the lower vibrating diaphragm and extends to the inner side of the first magnetic steel, and a framework extension part which extends from the framework body to the voice coil; the lower vibrating diaphragm is arranged on the inner side of the first magnetic steel and connected between the framework body and the magnetic yoke support platform;
the first magnetic steel comprises a plurality of adjacent first magnetic steels, a fracture is formed at an interval between the adjacent first magnetic steels, and the framework extension part penetrates through the fracture and is fixed on the voice coil.
2. The sounding device according to claim 1, wherein the magnetic circuit system further comprises a second magnetic steel fixed to the yoke body, the second magnetic steel is disposed outside the first magnetic steel and spaced from the first magnetic steel to form a magnetic gap, and the voice coil is inserted into the magnetic gap.
3. The sounding device according to claim 1, wherein the bobbin extension includes a bobbin extension body extending from the bobbin body toward the voice coil, a first fixing section bent and extended from the bobbin extension body toward the magnetic yoke, and a second fixing section bent and extended from the first fixing section toward a direction away from the bobbin body, the first fixing section is fixed to a side of the voice coil close to the first magnetic steel, and the second fixing section is fixed to an end of the voice coil close to the magnetic yoke.
4. The sounder device according to claim 1, wherein the yoke support platform is rectangular, the first magnets comprise four, two of the first magnets are spaced apart on opposite sides of the yoke support platform, and the other two of the first magnets are spaced apart on the other opposite sides of the yoke support platform; the skeleton extension includes four, and each skeleton extension passes an adjacent fracture.
5. The sounding device according to claim 4, wherein the voice coil is rectangular with rounded corners, and the four bobbin extensions are connected to the voice coil at four rounded corners respectively.
6. The sound production device of claim 1, further comprising a frame for supporting the vibration system and the magnetic circuit system, wherein the upper diaphragm, the frame, the skeleton body, the lower diaphragm and the magnetic circuit system together define a first inner sound cavity, the upper diaphragm, the skeleton body, the lower diaphragm and the magnetic yoke support platform together define a second inner sound cavity, the skeleton body is provided with a leakage hole therethrough, and the second inner sound cavity is communicated with the first inner sound cavity through the leakage hole.
7. The sounder device according to claim 6, wherein the leakage holes comprise a plurality of holes, the plurality of holes being spaced apart from one another.
8. The sounding device according to claim 1, wherein the lower diaphragm is annular, the lower diaphragm includes a first lower fixing portion fixed to the yoke support platform, a folded-down ring portion extending from an outer periphery of the first lower fixing portion in a folded manner, and a second lower fixing portion extending from an outer periphery of the folded-down ring portion in a direction of the first magnetic steel, and the skeleton body is fixed to the second lower fixing portion.
9. The sounding device according to claim 8, wherein the yoke supporting platform includes a supporting platform plate disposed opposite to the upper diaphragm, and a supporting platform sidewall extending from an outer periphery of the supporting platform plate to the yoke body in a bending manner, the supporting platform sidewall is connected to the yoke body and spaced from the first magnetic steel to form a gap, the first lower fixing portion is fixed to the supporting platform plate, and the folded-down ring portion is recessed toward the yoke body and is received in the gap.
10. The sounder device according to claim 2, wherein the magnetic circuit system further comprises a first clamping plate stacked on the first magnetic steel, a second clamping plate stacked on the second magnetic steel, and an auxiliary magnetic steel stacked on the second clamping plate, wherein the second magnetic steel is arranged opposite to the auxiliary magnetic steel in the same polarity, and the opposite magnetic pole in the same polarity is opposite to the magnetic pole on the side of the first magnetic steel close to the first clamping plate.
CN202010588033.8A 2020-06-24 2020-06-24 Sound production device Expired - Fee Related CN111641906B (en)

Priority Applications (2)

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