WO2022062122A1

WO2022062122A1 - Sound production device

Info

Publication number: WO2022062122A1
Application number: PCT/CN2020/128778
Authority: WO
Inventors: 令狐荣林; 章统; 孔晨亮; 肖波
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-09-27
Filing date: 2020-11-13
Publication date: 2022-03-31
Also published as: CN112261546A

Abstract

The present invention provides a sound production device, comprising a frame, and a vibration system and a magnetic circuit system which are respectively fixed to the frame, the magnetic circuit system driving the vibration system to vibrate and produce sound. The vibration system comprises a diaphragm, and a voice coil driving the diaphragm to vibrate and produce sound; the diaphragm comprises an annular vibration portion, an outer corrugated ring which is bent and extends from the outer periphery of the vibration portion, and an inner corrugated ring which is bent and extends from the inner periphery of the vibration portion; the side of the outer corrugated ring distant from the vibration portion is fixed to the frame; the side of the inner corrugated ring distant from the vibration portion is fixed to the magnetic circuit system; the outer corrugated ring or the inner corrugated ring comprises a first corrugated ring which is bent and extends from the vibration portion, and a second corrugated ring which is bent and extends from the side of the first corrugated ring distant from the vibration portion; and the second corrugated ring is fixed to the frame or the magnetic circuit system. Compared with the related art, the sound production device of the present invention has better acoustic performance.

Description

sound device

technical field

The present invention relates to the field of acoustics and electricity, in particular to a sound-generating device.

Background technique

With the advent of the Internet era, the number of mobile terminal devices continues to rise. Among mobile devices, mobile phones are undoubtedly the most common and portable mobile terminal devices. Sound devices used to play music and other sounds are widely used in mobile terminal devices such as mobile phones, and the vibration system in the sound device is particularly important. The entire sound device vibrates through the vibration system to emit sound.

A related art sound-generating device includes a basin frame, a vibration system fixed on the basin frame, and a magnetic circuit system that drives the vibration system to vibrate and sound; the vibration system includes a vibrating membrane, which is inserted in the magnetic gap to drive the A voice coil with a vibrating diaphragm, the diaphragm includes a vibrating portion, a ring portion extending from the periphery of the vibrating portion, and a fixing ring portion extending toward the basin frame from the ring portion and being fixed to the basin frame Department.

However, the distortion of the sound-generating device is mainly caused by the nonlinearity of the electromechanical coupling coefficient Bl(x), the stiffness coefficient kms(x), the inductance Le(x), and the damping Rms(v), where the stiffness coefficient kms(x) ) is jointly determined by the vibration system and the air in the back cavity. The K(x) of the air in the back cavity is related to the effective radiation area of the diaphragm at different positions. In the related art, the diaphragm has a small effective radiation area, resulting in stiffness. The coefficient kms(x) does not match the electromechanical coupling coefficient Bl(x), which further leads to the distortion of the sound-emitting device.

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

technical problem

The purpose of the present invention is to provide a sounding device with better acoustic performance.

technical solutions

In order to achieve the above object, the present invention provides a sound-emitting device, which includes a basin frame, a vibration system respectively fixed to the basin frame and a magnetic circuit system that drives the vibration system to vibrate and sound, and the vibration system includes a vibrating membrane and a driver. The diaphragm vibrates the voice coil for sound,

The vibrating membrane includes a ring-shaped vibrating portion, an outer folded ring bent and extended from the outer periphery of the vibrating portion, and an inner folded ring bent and extended from the inner periphery of the vibrating portion, and the outer folded ring is far away from the vibration One side of the part is fixed on the basin frame, and the side of the inner fold away from the vibrating part is fixed on the magnetic circuit system;

The outer folding ring or the inner folding ring comprises a first folding ring bent and extended by the vibrating part and a second folding ring which is bent and extended from a side of the first folding ring away from the vibrating part, The second folding ring is fixed to the basin frame or the magnetic circuit system.

Preferably, both the first folded ring and the second folded ring are formed concave along the vibration direction of the diaphragm, and the concave directions of the two are opposite.

Preferably, when the outer fold ring includes a first fold ring bent and extended from the vibrating part and a second fold ring bent and extended from a side of the first fold ring away from the vibrating part, the The first folding ring is recessed in the direction of approaching the magnetic circuit system, the second folding ring is recessed in the direction away from the magnetic circuit system, and the inner folding ring is recessed in the direction of the vibration direction away from the magnetic circuit system direction depression.

Preferably, when the inner folding ring includes a first folding ring bent and extended from the vibrating part and a second folding ring which is bent and extended from the side of the first folding ring far away from the vibrating part, the The first folding ring is recessed in a direction away from the magnetic circuit system, the second folding ring is recessed in a direction approaching the magnetic circuit system, and the outer folding ring is in a direction of approaching the magnetic circuit system along the vibration direction direction depression.

Preferably, the sound-generating device further includes a sealing ring that is pressed and arranged on the side of the inner fold away from the magnetic circuit system, and the sealing ring fixes the side of the inner fold away from the vibrating part on the side of the inner fold. The magnetic circuit system.

Preferably, the magnetic circuit system includes a magnetic yoke fixed to the basin frame, a main magnetic steel unit fixed to the magnetic yoke, and arranged at intervals on the periphery of the main magnetic steel unit and together with the main magnetic steel unit. A secondary magnetic steel unit forming a magnetic gap and a magnetic bowl covered on the main magnetic steel unit, the peripheral side of the magnetic bowl presses and fixes the side of the inner fold away from the vibrating part to the auxiliary magnetic steel unit A magnetic steel unit, the voice coil is suspended in the magnetic gap.

Preferably, the vibration system further includes a frame, the frame includes a frame body connected to the voice coil, and a frame connecting portion that is bent and extended from the frame body and abutted and fixed to the vibration portion.

Preferably, the sound-generating device further comprises a magnetic conductive plate fixed on the side of the basin frame close to the magnetic circuit system, and the side of the outer fold away from the vibrating part is fixed on the basin frame away from the one side of the magnetic conductive plate; the vibration system further includes an elastic conductive member fixed on the side of the magnetic conductive plate away from the vibrating membrane and electrically connected with the voice coil, the elastic conductive member passes through the magnetic conductive member The plate is fixed to the basin frame.

Preferably, the vibration system further includes an auxiliary diaphragm fixed on the side of the magnetic conductive plate away from the diaphragm, and the auxiliary diaphragm and the elastic conductive member are arranged at intervals.

beneficial effect

Compared with the related art, in the sound-emitting device of the present invention, the diaphragm includes a ring-shaped vibrating portion, an outer ring that is bent and extended from the outer periphery of the vibrating portion, and an inner ring that is bent and extended from the inner periphery of the vibrating portion. A fold ring, the side of the outer fold ring away from the vibration part is fixed to the basin frame, and the side of the inner fold ring away from the vibration part is fixed to the magnetic circuit system; further, the outer fold ring or the inner fold ring is fixed to the magnetic circuit system; The folding ring includes a first folding ring bent and extended by the vibrating part and a second folding ring which is bent and extended from the side of the first folding ring away from the vibrating part, and the second folding ring is fixed on the basin frame or Magnetic circuit system; With this structure, the effective radiation area of the diaphragm can be effectively changed, so that the stiffness coefficient kms(x) of the sound-emitting device and the electromechanical coupling coefficient Bl(x) are more matched, thereby reducing the distortion of the sound-emitting device , to improve acoustic performance.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

Fig. 1 is the three-dimensional structure schematic diagram of the sound-emitting device of the present invention

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

Fig. 3 is the sectional view of the sounding device of the present invention;

FIG. 4 is a schematic structural diagram of another embodiment of the present invention.

Embodiments of the present invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-3, the present invention provides a sound-generating device 100, the sound-generating device 100 includes a basin frame 1, a magnetic conducting plate 1a fixed to the basin frame 1, respectively fixed to the basin frame 1 and used for The magnetic circuit system 3 has a magnetic gap 30 for the vibration system 2 for vibrating and producing sound, the magnetic circuit system 3 for driving the vibration system 2 to vibrate and produce sound, and the sealing ring 4 .

Specifically, the vibration system 2 includes a diaphragm 21 fixed on the basin frame 1, a voice coil 22 inserted in the magnetic gap 30 to drive the diaphragm 21 to vibrate, a frame 23, an auxiliary diaphragm 24, Elastic conductive member 25 .

The diaphragm 21 includes a ring-shaped vibrating portion 211 , an outer ring 212 bent and extended from the outer periphery of the vibrating portion 211 , and an inner ring 213 bent and extended from the inner periphery of the vibrating portion 211 . The side of the inner ring 213 away from the vibration part 211 is fixed to the magnetic circuit system 3 ; the side of the outer ring 212 away from the vibration part 211 is fixed to the basin frame 1 away from the magnetic conducting plate 1a side. The outer folding ring 212 or the inner folding ring 213 includes a first folding ring 2131 bent and extended by the vibrating part 211 , and a bending and extending side of the first folding ring 2131 away from the vibrating part 211 . The second loop 2132. With this structure, the effective radiation area of the diaphragm 21 can be effectively changed, so that the stiffness coefficient kms(x) of the sound-emitting device 100 is more matched with the electromechanical coupling coefficient Bl(x), thereby reducing the distortion of the sound-emitting device 100, Improve acoustic performance

Specifically, the first fold ring 2131 and the second fold ring 2132 are recessed along the vibration direction of the vibrating membrane 21 and are recessed in opposite directions, that is, one of them is along the direction away from the magnetic circuit system 3 The other one of the first folding ring 2131 and the second folding ring 2132 is recessed in the direction of approaching the magnetic circuit system 3 .

In this embodiment, the inner folding ring 213 includes a first folding ring 2131 bent and extended from the vibrating part 211 and a first folding ring 2131 which is bent and extended from a side of the first folding ring 2131 away from the vibrating part 211 . Two folding rings 2132, the first folding ring 2131 is recessed in the direction away from the magnetic circuit system 3, the second folding ring 2132 is recessed in the direction close to the magnetic circuit system 3, the outer folding ring 212 is recessed along the direction of the magnetic circuit system 3 The vibration direction is concave toward the magnetic circuit system 3 ; the side of the second folding ring 2132 away from the first folding ring 2131 is fixed to the magnetic circuit system 3 . Specifically, the sealing ring 4 is pressed on the side of the second folding ring 2132 away from the magnetic circuit system 3 , and the sealing ring 4 keeps the second folding ring 2132 away from the vibrating part 211 . It is fixed to the magnetic circuit system 3 ; a sealing structure is formed to protect the internal structure of the sound-emitting device 100 and prevent dust from entering the interior to affect the performance of the sound-emitting device 100 .

The voice coil 22 is inserted in the magnetic gap 30 and has a racetrack shape.

The frame 23 includes a frame body 231 connected to the voice coil 22 , and a frame connecting portion 232 that is bent and extended from the frame body 231 and abutted and fixed to the vibrating portion 211 . The voice coil 22 is suspended in the magnetic gap 30 by the bobbin 23, and the reliability is better.

The elastic conductive member 25 is fixed on the side of the magnetic conductive plate 1a away from the diaphragm 21 and is electrically connected to the voice coil 22 , and the elastic conductive member 25 is fixed to the basin frame 1 through the magnetic conductive plate 1a In this embodiment, the elastic conductive members 25 include two and are respectively disposed on opposite sides of the voice coil 22 .

The auxiliary vibrating film 24 is fixed on the side of the magnetic conductive plate 1a away from the vibrating film 21 , and the auxiliary vibrating film 24 is spaced from the elastic conductive member 24 . In this embodiment, the auxiliary diaphragms 24 include two and are respectively disposed on opposite sides of the voice coil 22 . That is, by arranging the elastic conductive member 25 and the auxiliary diaphragm 24 side by side, the internal space of the sound-generating device 100 can be effectively utilized, and the overall volume of the sound-generating device 100 can be reduced.

The magnetic circuit system includes a magnetic yoke 31 fixed to the basin frame 1 , a main magnetic steel unit 32 fixed to the magnetic yoke 31 , spaced around the main magnetic steel unit 32 and connected to the main magnetic steel unit. 32 together form the secondary magnetic steel unit 33 of the magnetic gap 30 and the magnetic bowl 5 covered on the main magnetic steel unit 32. The side away from the vibrating portion 211 is pressed and fixed to the secondary magnetic steel unit 33 , and the voice coil 22 is suspended in the magnetic gap 30 .

The present invention also provides a sound-generating device 200, as shown in FIG. 4, the structure of which is substantially the same as that of the sound-generating device 100, the difference is that the outer ring 212a includes a first bending and extending portion of the vibration part 211a. When the fold ring 2121 and the second fold ring 2122 are bent and extended from the side of the first fold ring 2121 away from the vibrating part 211a, the first fold ring 2121 is recessed in the direction of approaching the magnetic circuit system, The second folding ring 2122 is recessed in a direction away from the magnetic circuit system and fixed to the basin frame, and the inner folding ring 213a is recessed in a direction away from the magnetic circuit system in the vibration direction.

The present invention provides an embodiment of the present invention as described above, which is not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied In other related technical fields, they are all included within the scope of patent protection of the present invention.

Claims

A sound-generating device, comprising a basin frame, a vibration system respectively fixed to the basin frame and a magnetic circuit system for driving the vibration system to vibrate and produce sound, the vibration system comprising a vibrating film and a sound for driving the vibrating film to vibrate and produce sound circle, characterized by,

The vibrating membrane includes a ring-shaped vibrating portion, an outer folded ring bent and extended from the outer periphery of the vibrating portion, and an inner folded ring bent and extended from the inner periphery of the vibrating portion, and the outer folded ring is far away from the vibration One side of the part is fixed on the basin frame, and the side of the inner fold away from the vibrating part is fixed on the magnetic circuit system;

The outer folding ring or the inner folding ring comprises a first folding ring bent and extended by the vibrating part and a second folding ring which is bent and extended from a side of the first folding ring away from the vibrating part, The second folding ring is fixed to the basin frame or the magnetic circuit system.
The sound-generating device according to claim 1, wherein the first folded ring and the second folded ring are formed concavely along the vibration direction of the diaphragm, and the concave directions of the two are opposite.
The sound-generating device according to claim 2, wherein when the outer folded ring comprises a first folded ring which is bent and extended from the vibrating part, and a first folded ring which is far from the vibrating part by the first folded ring When the extended second folded ring is bent sideways, the first folded ring is recessed in a direction close to the magnetic circuit system, the second folded ring is recessed in a direction away from the magnetic circuit system, and the inner folded ring It is recessed in the direction away from the magnetic circuit system along the vibration direction.
The sound-generating device according to claim 2, wherein when the inner ring comprises a first ring which is bent and extended from the vibrating part, and a first ring which is far from the vibrating part by the first ring When the extended second folding ring is bent sideways, the first folding ring is recessed in the direction away from the magnetic circuit system, the second folding ring is recessed in the direction approaching the magnetic circuit system, and the outer folding ring is recessed. It is recessed in the direction of approaching the magnetic circuit system along the vibration direction.
The sound-generating device according to claim 1, characterized in that, the sound-generating device further comprises a sealing ring pressed on the side of the inner folded ring away from the magnetic circuit system, and the sealing ring folds the inner folded ring. A side of the ring away from the vibrating part is fixed to the magnetic circuit system.
The sound-generating device according to claim 5, wherein the magnetic circuit system comprises a magnetic yoke fixed to the basin frame, a main magnetic steel unit fixed to the magnetic yoke, and a main magnetic steel unit arranged at intervals on the main magnetic steel unit. A secondary magnetic steel unit whose peripheral side forms a magnetic gap together with the main magnetic steel unit, and a magnetic bowl covered on the main magnetic steel unit, the peripheral side of the magnetic bowl keeps the inner fold away from the One side of the vibrating part is press-fitted and fixed to the auxiliary magnetic steel unit, and the voice coil is suspended in the magnetic gap.
The sound-generating device according to claim 1, wherein the vibration system further comprises a skeleton, the skeleton comprising a skeleton body connected with the voice coil, and a skeleton body bent and extended from the skeleton body and abutted and fixed on the skeleton body. the frame connecting part of the vibration part.
The sound-generating device according to claim 1, characterized in that, the sound-generating device further comprises a magnetic conductive plate fixed on the side of the basin frame close to the magnetic circuit system, and the outer fold ring is far away from the vibration part The side of the frame is fixed on the side of the basin frame away from the magnetic conductive plate; the vibration system also includes an elastic conductive cable that is fixed to the magnetic conductive plate away from the diaphragm and is electrically connected to the voice coil. The elastic conductive element is fixed to the basin frame through the magnetic conducting plate.
The sound-generating device according to claim 8, wherein the vibration system further comprises an auxiliary diaphragm fixed on the side of the magnetic conductive plate away from the diaphragm, the auxiliary diaphragm and the elastic conductive Piece interval setting.