WO2022000519A1

WO2022000519A1 - Loudspeaker

Info

Publication number: WO2022000519A1
Application number: PCT/CN2020/100718
Authority: WO
Inventors: 肖波; 令狐荣林; 章统; 孔晨亮
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-06-30
Filing date: 2020-07-07
Publication date: 2022-01-06
Also published as: CN212486779U

Abstract

The present application provides a loudspeaker, comprising a basket, a vibration system, and a magnetic circuit system. The vibration system comprises a first vibration diaphragm, a frame, a voice coil connected to the frame, and an airflow system fixed on the frame. The airflow system comprises a first ventilation component, a second ventilation component, and an elastic film connected between the first ventilation component and the second ventilation component. The elastic film, the first ventilation component, and the second ventilation component enclose to form a closed cavity. In the present application, the airflow system and the first vibration diaphragm synchronously vibrate, and the airflow in the airflow system is in communication with the outside of the first vibration diaphragm by means of an air tube. When the first vibration diaphragm vibrates, the airflow system also vibrates, and the acoustic wave airflow in the airflow system also propagates to the outside of the first vibration diaphragm by means of the air tube. The structural design increases the overall effective vibration area inside the loudspeaker, and thus the low frequency response potential and the intermediate frequency sensitivity of the loudspeaker are improved.

Description

a loudspeaker

technical field

The utility model relates to the technical field of acoustics, in particular to a loudspeaker.

Background technique

In the prior art, the speaker diaphragm and the voice coil are connected, and the vibration of the voice coil drives the vibration of the diaphragm, so that the speaker emits sound. The vibration of the diaphragm determines how loud the speaker sounds and how sensitive the audio is. In order to improve the vibration effect of the diaphragm, a dome is usually added to the diaphragm.

technical problem

When the diaphragm vibrates under the drive of the voice coil, the center of the diaphragm will vibrate, and the edge of the diaphragm will take time due to the vibration transmission, and the amplitude will be lost during the transmission process, resulting in the sound volume of the diaphragm edge vibration. Smaller and laggy in audio. Therefore, the effective vibration area where the diaphragm plays a role in producing sound determines the volume and audio sensitivity of the speaker. Only by increasing the effective vibration area can the volume and audio sensitivity of the speaker be improved.

Therefore, it is necessary to provide a loudspeaker to solve the problem that the effective vibration area of the loudspeaker is too small.

technical solutions

The purpose of this utility model is to provide a loudspeaker which can increase the effective vibration area.

The technical solution of the present invention is as follows: a loudspeaker comprising a basin frame, a vibration system fixed on the basin frame and a magnetic circuit system, the magnetic circuit system comprising a first magnetic yoke and a magnetic circuit system fixed on the first magnetic yoke A first magnet part facing one side of the vibration system and forming a magnetic gap, the first magnet part is provided with a receiving cavity located in the middle position and spaced from the magnetic gap, and the vibration system includes a cavity fixed to the basin a first vibrating membrane for vibrating and producing sound, a skeleton fixed on the side of the vibrating membrane facing the first magnet part, a voice coil connected with the skeleton and suspended in the magnetic gap, and a skeleton fixed on the The frame is at least partially accommodated in the air flow system of the accommodating cavity.

The air flow system includes a first air-permeable component fixed to the frame and arranged opposite to the first diaphragm, and a first air-permeable component disposed on the side of the first air-permeable component away from the first diaphragm and connected to the first diaphragm. A second ventilating component arranged at intervals between the ventilating components and an elastic membrane connecting the first ventilating component and the second ventilating component, the elastic membrane being connected to the first ventilating component and the second ventilating component A closed cavity is formed around the enclosure; the elastic diaphragm is concave toward the closed cavity.

The first magnetic yoke is provided with a protruding portion that protrudes toward the first diaphragm and is accommodated in the accommodating cavity, and the second air-permeable component is supported on the protruding portion; the first The ventilation component is provided with a first through hole passing through it in the vibration direction, the first diaphragm is provided with a second through hole passing through it in the vibration direction, and the airflow system further includes a A trachea between the ventilation component and the first diaphragm, the trachea communicates with the first through hole and the second through hole to form a ventilation channel, and the ventilation channel communicates the airtight cavity with the outside world.

More preferably, the elastic membrane includes a side wall surrounding the closed cavity, and the side wall is recessed toward the interior of the closed cavity.

More preferably, the first ventilation component includes a first sound membrane having the first through hole and a first connecting ring surrounding the first sound membrane, and the inner edge of the first connecting ring is connected to the first sound membrane. A sound membrane is connected, and the outer edge of the first connecting ring is fixed between the frame and the elastic diaphragm.

More preferably, the second ventilation component includes a second sound membrane in the middle position and a second connecting ring surrounding the second sound membrane, and the inner edge of the second connecting ring is connected with the second sound membrane , the outer edge of the second connection ring is fixedly connected with the end of the elastic diaphragm away from the first connection ring; the second sound diaphragm is supported on the raised portion.

More preferably, the second sound membrane is provided with a third through hole extending therethrough along the vibration direction, and the protruding portion of the first magnetic yoke at least partially protrudes into the third through hole and is connected with the third through hole. The side walls of the three through holes form a sealed connection.

More preferably, the frame includes a frame body connected to the first diaphragm and a support frame extending from an end of the frame body away from the first diaphragm, and the voice coil surrounds the frame and is connected to the frame. The support frame is fixedly connected.

More preferably, the frame body is rectangular, and the number of the support brackets is 4, which are distributed at four corners of the frame body.

More preferably, the first magnet part includes a first main magnetic steel and a first auxiliary magnetic steel surrounding the first main magnetic steel and opposite to each other to form the magnetic gap, and the accommodating cavity is formed by the first auxiliary magnetic steel. The main magnet is surrounded by steel.

More preferably, the number of the first main magnets is four, the four first main magnets are facing each other end to end to form a rectangle, and the number of the first auxiliary magnets is also bars.

More preferably, the magnetic circuit system further includes a second magnetic yoke spaced apart from the first magnetic yoke, the second magnetic yoke includes a frame fixedly connected to the basin frame, and extends inward from the inner side of the frame and is connected to the first magnetic yoke. A pair of magnetic steel is fixedly connected to a secondary magnetic conductive sheet, and a side of the first main magnetic steel away from the first magnetic yoke is provided with a primary magnetic sheet connected to it.

More preferably, a side of the secondary magnetic conductive sheet away from the first magnetic yoke is further provided with an auxiliary magnetic steel connected to it.

More preferably, the first diaphragm includes a diaphragm main body and a third connecting piece, the diaphragm main body includes a center portion located at an intermediate position, a ring portion surrounding and connected to the center portion, and a ring portion surrounding the center portion. The folded ring portion is connected with the fixing portion, the fixing portion is fixedly connected with the end of the basin frame away from the first magnetic yoke, and the second through hole penetrates the central portion and the third connecting piece.

More preferably, the speaker further includes a flexible circuit board electrically connected to the voice coil.

More preferably, the airflow system is in the shape of a rectangle, and the cross section of the elastic membrane along the direction parallel to the first ventilation component is in the shape of a long side.

beneficial effect

The beneficial effect of the utility model is that the air flow system and the first vibrating film set in the present utility model vibrate synchronously, and the air flow in the air flow system communicates with the outside outside the first vibrating film through the air pipe. When the first diaphragm vibrates, the airflow system is also vibrating, and the sound wave airflow in the airflow system also propagates to the outside outside the first diaphragm through the trachea. This structural design increases the vibration area of the airflow system on the basis of the effective vibration area of the first diaphragm, thereby increasing the overall effective vibration area inside the loudspeaker, and further improving the low-frequency response potential and mid-frequency response potential of the loudspeaker. sensitivity.

Description of drawings

FIG. 1 is a three-dimensional schematic diagram of a loudspeaker according to an embodiment of the present invention.

FIG. 2 is an exploded view of a loudspeaker according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 1 .

FIG. 4 is a perspective view of the first magnetic yoke in the present invention.

FIG. 5 is an assembly diagram of the first magnetic yoke and the first magnet part in the present invention.

6 is an assembly diagram of the first magnetic yoke, the first magnet portion, the airflow system, and the skeleton in the present invention.

7 is an assembly diagram of the first magnetic yoke, the first magnet part, the airflow system, the skeleton, the voice coil, the second magnetic yoke, and the auxiliary magnetic steel in the present invention.

FIG. 8 is a schematic perspective view of the airflow system in the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The present utility model will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some of the embodiments of the present invention, but 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 work fall within the protection scope of the present invention.

As shown in Figures 1-3, an embodiment of the present invention provides a loudspeaker. The speaker includes a basin frame 1 , a vibration system and a magnetic circuit system fixed on the basin frame 1 . In this embodiment, the basin frame 1 is annular, and is used to provide fixed support for the vibration system and the magnetic circuit system.

In the embodiment of the present invention, the magnetic circuit system includes a first magnetic yoke 31 for magnetic permeability, a first magnet part 33 , a second magnetic yoke 35 for magnetic permeability, and an auxiliary magnetic steel 5 . The first magnetic yoke 31 is used to conduct magnetism for the first magnet portion 33 , and a protruding portion 311 is also provided at the center of the first magnetic yoke 31 . The first magnet portion 33 is fixed to the side of the first yoke 31 facing the vibration system 2 .

4 to 7 , in the embodiment of the present invention, the first magnet portion 33 includes a first main magnetic steel 331 and a first secondary magnetic steel 332 that are fixedly connected to the first magnetic yoke 31 . The number of the first main magnets 331 and the first auxiliary magnets 332 is four, and the four first main magnets 331 face each other end to end to form a rectangle. The four first secondary magnets 332 surround the first main magnet 331 and are spaced opposite to each other to form a magnetic gap 32 . The energized voice coil 23 generates electromagnetic induction force in the magnetic gap 32 to generate vibration.

In the embodiment of the present utility model, the second magnetic yoke 35 is used to conduct magnetic conduction for the first secondary magnetic steel 332 , and includes a frame 351 fixedly connected with the basin frame 1 and a frame 351 extending inward from the inner side of the frame 351 . Secondary magnetic conductive sheet 352 . The auxiliary magnetic conductive sheet 352 is fixedly connected with the first auxiliary magnetic steel 332 to play a role of magnetic conduction for the first auxiliary magnetic steel 332 . In order to also play the role of magnetic permeability for the first main magnet 331, the magnetic circuit system 3 further includes a main magnet 333, the main magnet 333 is connected to the first main magnet 331 and is located away from the first main magnet 331. one side of the first yoke 31 .

In the embodiment of the present invention, the auxiliary magnetic steel 5 is used to strengthen the internal magnetic field strength of the speaker.

In the embodiment of the present invention, the vibration system includes a first vibrating membrane 21 that vibrates and emits sound, a frame 22 that is fixedly connected to the first vibrating membrane 21, a voice coil 23 that is connected to the frame 22, and at least partially accommodated in the housing The airflow system 4 of the cavity 34 .

As shown in FIG. 2 , FIG. 3 and FIG. 8 , the airflow system 4 is a closed cavity 44 in the shape of a rectangle, and part of the airflow system 4 is accommodated in the airflow system 4 of the accommodating cavity 34 . It includes a first ventilation component 41 , a second ventilation component 42 and an elastic membrane 43 connected between the first ventilation component 41 and the second ventilation component 42 . The first ventilating component 41 , the second ventilating component 42 and the elastic membrane 43 are enclosed to form a closed cavity 44 . A trachea 45 is provided between the membranes 21, and a first through hole 411 is also provided on the first ventilation component 41. The trachea 45 connects the first through hole 411 and the second through hole 211, so as to conduct the air flow of the airtight cavity 44 to the outside outside the first diaphragm 21 .

More preferably, the first ventilation component 41 includes a first sound membrane 412 and a first connecting ring 413, the first connecting ring 413 surrounds the first sound membrane 412, and the inner edge of the first connecting ring 413 is connected with the first sound membrane 412, The outer edge is connected to the frame 22 and fixed between the frame 22 and the elastic diaphragm 43 . In order to conduct the air flow from the closed cavity 44 to the outside, a first through hole 411 is provided on the first sound membrane 412 , and the first through hole 411 penetrates the first sound membrane 412 along the vibration direction.

As shown in FIGS. 2-3 in conjunction with FIG. 8 , the second ventilating component 42 is opposite to the first ventilating component 41 and separated by a certain distance, and the second ventilating component 42 is located at a distance from the first ventilating component 41 away from the first diaphragm 21 . side, and is supported by the raised portion 311 of the first yoke 31 . More specifically, the second ventilation component 42 includes a second sound membrane 421 and a second connection ring 422, the second sound membrane 421 is located in the middle of the second ventilation component 42, and the second connection ring 422 surrounds the first sound membrane 422. The inner edge of the second connection ring 422 is connected with the second sound film 421 , and the outer edge is fixedly connected with the end of the elastic diaphragm 43 away from the first connection ring 413 . The second sound membrane 421 is provided with a third through hole 423 , and the third through hole 423 penetrates the second sound membrane 421 along the vibration direction. The protruding portion 311 of the first magnetic yoke 31 at least partially protrudes into the third through hole 423 and is sealedly connected with the side wall of the third through hole 423 , thereby ensuring that the second sound membrane 421 is fixed.

In the embodiment of the present invention, the airflow system 4 is in the shape of a rectangle, and the cross section of the elastic membrane 43 parallel to the direction of the first ventilation component 41 is a long-side shape. The side wall 431 of the airtight cavity, the side wall 431 is recessed toward the interior of the airtight cavity. The concave structure design is beneficial to the overall synchronization of the vibration of the first diaphragm 21 by the airflow system 4 .

In the embodiment of the present invention, the first diaphragm 21 includes a diaphragm main body 212 and a third connecting member 213 . The diaphragm body 212 includes a center portion 2121 , a ring portion 2122 surrounding and connected to the center portion 2121 , and a fixing portion 2123 surrounding and connected to the ring portion 2122 . The fixing portion 2123 is fixedly connected to the end of the basin frame 1 away from the first magnetic yoke 31 , so that the edge end of the first diaphragm 21 is fixedly supported by the basin frame 1 . In order to communicate with the airtight cavity 44 and the outside world outside the first diaphragm 21 , a second through hole 211 is provided on the first diaphragm 21 , and the second through hole 211 penetrates through the central portion 2121 of the first diaphragm 21 and the first diaphragm 21 . Three connecting pieces 213 . The third connecting member 213 is fixed to the center portion 2121 of the diaphragm main body 212 for enhancing the hardness of the diaphragm main body 212 .

In the embodiment of the present invention, the frame 22 is used to connect the first diaphragm 21 , the voice coil 23 and the airflow system 4 , so that the voice coil 23 drives the first diaphragm 21 and the airflow system 4 to vibrate synchronously. More specifically, the frame 22 includes a frame body 221 and a support frame 222 extending from an end of the frame body 221 away from the first diaphragm 21 . One end of the frame body 221 is connected to the first diaphragm 21 , and the other end is connected to the outer edge of the first connection ring 413 . The voice coil 23 surrounds the frame 22 and is fixedly connected to the support frame 222 , that is, the voice coil 23 is sleeved on the support frame 222 . One end of the first diaphragm 21 is further provided with a support leg 223 extending from the support frame 222 , and one end of the voice coil 23 away from the first diaphragm 21 is fixedly connected to the support leg 223 . The number of the support frames 222 is four, which are distributed at four corners of the frame body 221 .

The loudspeaker further includes a flexible circuit board 6 electrically connected to the voice coil 23 for energizing the voice coil 23 . In the embodiment of the present invention, the flexible circuit board 6 is mounted on the frame 351 of the second magnetic yoke 35 .

The air flow system 4 and the first diaphragm 21 in the present invention vibrate synchronously under the driving of the voice coil 23 and the frame 22 , and the air flow in the air flow system 4 communicates with the outside world outside the first diaphragm 21 through the air pipe 45 . When the first diaphragm 21 is vibrating, the airflow system 4 is also vibrating, and the sound wave airflow in the airflow system 4 also propagates to the outside outside the first diaphragm 21 through the air pipe 45 . This structural design increases the vibration area of the airflow system 4 on the basis of the effective vibration area of the first diaphragm 21, thereby increasing the overall effective vibration area inside the speaker, and further improving the low frequency response potential of the speaker and IF sensitivity.

The above are only the embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these belong to The scope of protection of the utility model.

Claims

A loudspeaker comprising a basin frame, a vibration system fixed to the basin frame, and a magnetic circuit system, characterized in that the magnetic circuit system includes a first magnetic yoke and a magnetic circuit system fixed on the first magnetic yoke to vibrate toward the first magnetic yoke A first magnet part on one side of the system and forming a magnetic gap, the first magnet part is provided with a receiving cavity located in the middle position and spaced from the magnetic gap; a first diaphragm that vibrates and emits sound, a skeleton fixed on the side of the diaphragm facing the first magnet portion, a voice coil connected to the skeleton and suspended in the magnetic gap, and fixed to the skeleton and at least partially an airflow system accommodated in the accommodating cavity;

The air flow system includes a first air-permeable component fixed to the frame and arranged opposite to the first diaphragm, and a first air-permeable component disposed on the side of the first air-permeable component away from the first diaphragm and connected to the first diaphragm. A second ventilating component arranged at intervals between the ventilating components and an elastic membrane connecting the first ventilating component and the second ventilating component, the elastic membrane being connected to the first ventilating component and the second ventilating component A closed cavity is formed by enclosing it; the elastic diaphragm is concave toward the closed cavity;

The first magnetic yoke is provided with a protruding portion that protrudes toward the first diaphragm and is accommodated in the accommodating cavity, and the second air-permeable component is supported on the protruding portion; the first The ventilation component is provided with a first through hole passing through it in the vibration direction, the first diaphragm is provided with a second through hole passing through it in the vibration direction, and the airflow system further includes a A trachea between the ventilation component and the first diaphragm, the trachea communicates with the first through hole and the second through hole to form a ventilation channel, and the ventilation channel communicates the airtight cavity with the outside world.
The loudspeaker according to claim 1, wherein the elastic diaphragm includes a side wall surrounding the closed cavity, and the side wall is recessed toward the interior of the closed cavity.
The loudspeaker according to claim 1, wherein the first ventilation component comprises a first sound membrane having the first through hole and a first connecting ring surrounding the first sound membrane, the first sound membrane The inner edge of the connection ring is connected with the first sound membrane, and the outer edge of the first connection ring is fixed between the frame and the elastic diaphragm.
The loudspeaker according to claim 1 or 3, wherein the second ventilation component comprises a second sound membrane located in the middle position and a second connecting ring surrounding the second sound membrane, the second connecting ring The inner edge of the ring is connected with the second sound membrane, and the outer edge of the second connecting ring is fixedly connected with the end of the elastic diaphragm away from the first connecting ring; the second sound membrane is supported on the convex start.
The loudspeaker according to claim 4, wherein the second sound membrane is provided with a third through hole penetrating therethrough along the vibration direction, and the protruding portion of the first magnetic yoke at least partially protrudes into the second sound film. A sealed connection is formed in the third through hole and with the side wall of the third through hole.
The loudspeaker according to claim 1, wherein the frame comprises a frame body connected to the first diaphragm and a support frame extending from an end of the frame body away from the first diaphragm, the A voice coil surrounds the frame and is fixedly connected to the support frame.
The loudspeaker according to claim 6, wherein the end of the support frame away from the first diaphragm is further provided with a support foot extending from the support frame, and the voice coil is away from the first diaphragm One end is fixedly connected to the support foot.
The loudspeaker according to claim 6 or 7, wherein the frame body is rectangular, and the number of the support brackets is 4, which are distributed at four corners of the frame body.
The loudspeaker according to claim 1, wherein the first magnet part comprises a first main magnetic steel and a first auxiliary magnetic steel surrounding the first main magnetic steel and being spaced opposite to form the magnetic gap, The accommodating cavity is surrounded by the first main magnet steel.
The loudspeaker according to claim 9, wherein the number of the first main magnets is four, the four first main magnets face each other end to end to form a rectangle, and the number of the first auxiliary magnets is also Four.
The loudspeaker according to claim 9, wherein the magnetic circuit system further comprises a second magnetic yoke spaced apart from the first magnetic yoke, the second magnetic yoke comprising a frame fixedly connected to the basin frame and A secondary magnetic conductive sheet extending inward from the inner side of the frame and fixedly connected to the first secondary magnetic steel, and a main magnetic sheet connected to the side of the first main magnetic steel away from the first magnetic yoke is provided.
The loudspeaker according to claim 11, characterized in that, the side of the auxiliary magnetic conductive sheet away from the first magnetic yoke is further provided with an auxiliary magnetic steel connected to it.
The loudspeaker according to claim 1, wherein the first diaphragm comprises a diaphragm main body and a third connecting member, the diaphragm main body includes a center portion located in a middle position, surrounds and is connected with the central portion a connected folded ring part, and a fixed part surrounding the folded ring part and connected with it, the fixed part is fixedly connected with the end of the basin frame away from the first magnetic yoke, and the second through hole penetrates the the central part and the third connector.
The loudspeaker according to claim 1, wherein the loudspeaker further comprises a flexible circuit board electrically connected with the voice coil.
The loudspeaker according to claim 1, wherein the airflow system is in the shape of a rectangular body, and the cross-section of the elastic diaphragm along a direction parallel to the first ventilation component is in the shape of a long side.