CN108566597B

CN108566597B - Sound production device

Info

Publication number: CN108566597B
Application number: CN201810373992.0A
Authority: CN
Inventors: 朱婷; 刘岩涛
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-04-24
Filing date: 2018-04-24
Publication date: 2020-05-19
Anticipated expiration: 2038-04-24
Also published as: CN108566597A

Abstract

The invention discloses a sound generating device, which comprises a magnetic circuit system, wherein the magnetic circuit system comprises a magnetic conductive yoke and a magnetic circuit part arranged on one surface of the magnetic conductive yoke, a first side wall of the sound generating device is enclosed in a direction opposite to the magnetic circuit part to form a first cavity, and the magnetic conductive yoke and the magnetic circuit part are wrapped by the first side wall; the first side wall is made of a magnetic conductive material. According to one embodiment of the disclosure, the influence of a magnetic field in the sound production device on surrounding components can be effectively reduced.

Description

Sound production device

Technical Field

The invention relates to the technical field of sound-electricity transduction, in particular to a sound generating device.

Background

The sound generating device is an important component in an electronic product and is used for converting an electric signal into an acoustic signal. The development trend of electronic products is more and more thin, and in order to realize more functions, components and parts in the electronic products are more and more, and the space that must reserve for sound generating mechanism is more and more littleer, and electronic products more and more pay attention to user's music experience, consequently requires sound generating mechanism to have better tone quality.

The sound generating device is an electroacoustic device capable of working independently, and has certain requirements on acoustic performance, such as the need of a magnetic circuit system with enough size, the requirement of a back cavity volume and the like. Under the condition that the space of a terminal product is reduced, the space of the product is limited, the performance of a loudspeaker product with a small size inevitably has attenuation to a certain degree, and the improvement of user experience is not facilitated. On the other hand, the number of components around the sound generating device is more and more, the generated magnetic fields sometimes affect each other, the performance is reduced, especially in a mobile phone product, the sound generating device is applied as a receiver, the number of components integrated around the receiver is more, and the components sensitive to magnetic lines of force are all affected by the sound generating device, and are closer to a camera lens.

Therefore, a sound generating device with a novel structure is needed, which has a small volume and good performance, or can reduce the influence on peripheral components, so as to meet the development requirements of electronic products.

Disclosure of Invention

One object of the present invention is to provide a new solution for a sound generating device.

According to a first aspect of the present invention, there is provided a sound generating device, including a magnetic circuit system, the magnetic circuit system including a magnetic yoke and a magnetic circuit portion disposed on one side of the magnetic yoke, a first side wall of the sound generating device enclosing a first cavity in a direction opposite to the magnetic circuit portion, and the first side wall wrapping the magnetic yoke and the magnetic circuit portion; the first side wall is made of magnetic conductive material

Optionally, the vibration system is further included, the magnetic circuit portion is opposite to the vibration system, and the first side wall encloses a first cavity in a direction opposite to the magnetic circuit portion.

Optionally, a sound absorbing material is disposed within the first cavity.

Optionally, the vibration system includes a diaphragm, the first cavity is communicated with the back of the diaphragm, and a breathable isolation member is arranged between the first cavity and the diaphragm.

Optionally, the first cavity has an opening in a direction away from the magnetic circuit portion, and a cover plate is hermetically disposed on the opening and made of a magnetically conductive material.

Optionally, the cover plate is integrally formed with the first side wall.

Optionally, the magnetic circuit system includes a second cavity disposed in the magnetic circuit system, and one end of the second cavity is communicated with the first cavity.

Optionally, the second cavity extends through the magnetic circuit system.

Optionally, the second cavity is filled with sound absorbing material.

Optionally, the edge of the magnetic circuit portion abuts against the first side wall, or a voice coil is included in the sound generating device, and the voice coil is disposed between the edge of the magnetic circuit portion and the first side wall.

Optionally, the first side wall is hermetically connected to the magnetic conductive yoke.

According to one embodiment of the disclosure, the influence of a magnetic field in the sound production device on surrounding components can be effectively reduced.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 3 is an exploded view of one embodiment of the present invention;

in the figure: 1 magnetic circuit system, 11 magnetic yoke, 12 magnetic circuit part, 2 vibration system, 21 vibrating diaphragm, 22 voice coil, 23 electric connector, 3 first cavity, 31 apron, 32 first through-hole, 4 ventilative separators, 5 first lateral wall, 6 second cavity, 61 second through-hole, 62 third through-hole, 63 fourth through-hole, 7 casings, 71 protecgulums.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The invention provides a sound generating device, which is shown in figures 1-3 and comprises a magnetic circuit system 1. The magnetic circuit system 1 comprises a magnetic yoke 11 and a magnetic circuit portion 12. The magnetic circuit portion 12 is provided on one surface of the magnetic yoke 11. The magnetic circuit portion 12 includes a magnet and a washer, and the washer is disposed on a surface of the magnet away from the yoke 11. The yoke 11 and the magnetic circuit portion 12 are enclosed within the sound generating device by the first side wall 5 of the sound generating device. The first side wall 5 is a part of the outer wall of the sound generating device and is used for enclosing the magnetic circuit system 1. The magnetic circuit system 1 can be embedded into the area enclosed by the first side wall 5; it is also possible that the first sidewall 5 belongs to a detachable casing part, and after the magnetic circuit system 1 is mounted on the sound generating device, the detachable casing part including the first sidewall 5 is fastened on the sound generating device to wrap the magnetic circuit system 1. The first side wall 5 is made of a magnetic conductive material, and can play a role of magnetic shielding after enclosing the magnetic circuit system 1, and when the sound generating device is applied to equipment, the influence of a magnetic field on surrounding components can be reduced, and the stability of the equipment is improved.

Optionally, as shown in fig. 1-3, a vibration system 2 is further included in the sound generating device, the magnetic circuit portion 12 being opposite to the vibration system. The first side wall 5 and the yoke 11 are formed with a first cavity 3 in a direction opposite to the magnetic path portion 12. The first cavity 3 is communicated with the back surface of the vibrating diaphragm 21 in the vibration system 2, and after one end of the first cavity 3, which is far away from the magnetic yoke 11, is sealed, the first cavity 3 can become a back cavity of the sound generating device, so that an acoustic function is realized.

Optionally, a sound absorbing material is disposed in the first cavity 3. Can carry out equivalent dilatation to first cavity 3, be favorable to under the condition of same cavity size, realize better acoustic performance.

Optionally, the sound absorbing material is a microporous sound absorbing material such as zeolite particles. Further, the zeolite particles may include a plurality of zeolite particles, each of which has a silica to alumina molar ratio greater than 200 or is aluminum-free, so as to better achieve the equivalent capacity expansion effect.

Optionally, as shown in fig. 1-3, a breathable spacer 4 is disposed between the first cavity 3 and the back surface of the diaphragm 21 in the vibration system 2, and is used for isolating the sound-absorbing material, so as to prevent the sound-absorbing material from directly contacting with the diaphragm 21 and affecting the acoustic performance of the sound-generating device. The air-permeable partition 4 may allow air to pass therethrough and prevent sound-absorbing material from passing therethrough, and the specific structure and shape thereof are not limited in the present application.

Alternatively, as shown in fig. 1-3, the first cavity 3 has an opening in a direction away from the magnetic circuit portion 12, the opening is hermetically provided with a cover plate 31, and the cover plate 31 is hermetically arranged at the opening of the first cavity 3 in a direction opposite to the magnetic circuit portion 12, and is used for closing the first cavity 3 and ensuring the acoustic function of the first cavity 3. In other specific embodiments, the cover plate 31 may not be provided, and it is also possible to directly close the open side of the first cavity 3 on the magnetic yoke 11 on the housing of the application device, so as to maximize the internal volume of the first cavity 3, which is not limited in this application. The cover plate 31 is made of a magnetic conductive material, so that effective magnetic isolation can be performed on the magnetic circuit system 1, and the magnetic field is prevented from leaking to influence peripheral components; the thickness of the cover plate 31 is reduced, the internal volume of the first cavity 3 is increased, and the heat dissipation performance of the sound generating device is improved.

Alternatively, as shown in fig. 1 to fig. 3, the cover plate 31 is integrally formed with the first side wall 5, and may form a detachable housing portion, and then is fastened to the sound generating device to wrap the magnetic circuit system 1, so as to magnetically isolate the magnetic field in the sound generating device, and reduce the influence on peripheral components.

Optionally, a sound absorbing material is arranged in the first cavity 3, a first through hole 32 for filling the sound absorbing material is arranged on the cover plate 31, a breathable partition member 4 is arranged on the first through hole 32, after the sound absorbing material is filled through the first through hole 32, the sound absorbing material is separated through the breathable partition member 4, the sound absorbing material is prevented from leaving the first cavity 3, and meanwhile, after the separation, the first through hole 32 can be used as a pressure equalizing hole to ensure the air pressure balance in the first cavity 3. In other embodiments, as shown in fig. 1 to 3, the first through hole 32 may also be disposed on the first sidewall 5, so that the cover plate 31 may not be disposed, and the effective volume of the first cavity 3 may be increased, thereby increasing the filling amount of the sound-absorbing material, equivalently expanding the volume, and enhancing the acoustic performance of the sound-generating device.

Optionally, as shown in fig. 1 to fig. 3, the magnetic circuit system 1 includes a second cavity 6 disposed in the magnetic circuit system 1, and one end of the second cavity 6 is communicated with the first cavity 3, so that the volume of the back cavity of the sound generating device can be increased, and more sound absorbing materials can be disposed, which is beneficial to improving the acoustic performance of the sound generating device. As shown in fig. 1 to 3, the second cavity 6 may include a second through hole 61 provided in the magnetic conductive yoke 11, and a third through hole 62 or a groove provided in the magnet in the magnetic circuit portion 13 and corresponding to the second through hole 61. Further, the second cavity 6 penetrates through the magnetic circuit system 4, and the other end of the second cavity is communicated with the back surface of the diaphragm 21 in the diaphragm 21 system. As shown in fig. 1 to fig. 3, the washer 16 is provided with a fourth through hole 63 at a position corresponding to the third through hole 62, and the second cavity 6 is communicated with the back surface of the diaphragm 21 in the vibration system 2 through the fourth through hole 63, so that the first cavity 3 can be communicated with the back surface of the diaphragm 21 in the vibration system 2 through the second cavity 6, and the volume of the back cavity of the sound generating device is also increased.

Optionally, the second through hole 61, the third through hole 62 and the fourth through hole 63 are the same in size.

Optionally, a ventilation spacer 4 is disposed on one side of the fourth through hole 63 close to the diaphragm 21, so as to maximally increase the filling amount of the sound-absorbing material in the second cavity 6. .

Optionally, as shown in fig. 1 to fig. 3, the third through hole 62 is larger than the fourth through hole 63, and the fourth through hole 63 is provided with the air-permeable partition 4 on a side close to the third through hole 62, so that the fixing stability of the air-permeable partition 4 can be improved, and the air-permeable partition is prevented from accidentally falling off in the using process, so that the sound-absorbing material is in direct contact with the diaphragm, and the acoustic performance of the sound-generating device is affected.

Optionally, a clamping groove is formed between the magnetic circuit part 13 and the washer 16 at the edge of the communication position of the third through hole 62 and the fourth through hole 63, and the breathable isolating piece 4 clamped into the clamping groove is arranged on one side of the fourth through hole 63 close to the third through hole 62, so that the breathable isolating piece 4 can be clamped and fixed, the fixing stability of the breathable isolating piece is improved, and the breathable isolating piece is prevented from falling off; the contact area of the sound-absorbing material with air can also be increased.

Alternatively, as shown in fig. 1 to 3, the second through hole 61 is disposed at a middle position of the magnetic yoke 11, so that symmetry of the magnetic circuit system can be improved, and performance of the magnetic circuit system can be ensured.

Optionally, the first side wall 5 is connected to the edge of the magnetic yoke 11 in a sealing manner, so that the structural stability and the sealing performance of the first cavity 3 can be improved, and the acoustic performance of the first cavity can be ensured. The first side wall 5 and the magnetic yoke 11 may be connected and sealed by means of abutting, laser welding, bonding, and the like, which is not limited in the present application.

Optionally, the first side wall 5 and the magnetic yoke 11 are integrally formed, so that the integration of the first cavity 3 and the integration of the sound generating device are improved, structural parts are reduced, the structural stability and the sealing performance of the first cavity 3 can be improved to the maximum extent, and the acoustic performance of the first cavity is ensured; by means of the arrangement, the magnetic circuit system 1 is maximized, and the performance of the sound production device is optimized.

Optionally, the edge of the magnetic circuit portion 12 abuts against the first side wall 5, which is suitable for the five magnetic circuits shown in fig. 3 when the magnetic circuit portion 13 is a multi-magnetic circuit, so that the magnetic circuit thereof is maximized; alternatively, the vibration system 2 may have a voice coil 22, the voice coil 22 is disposed between the edge of the magnetic circuit portion 13 and the first sidewall 5, and when the magnetic circuit portion 13 is a single magnetic circuit, the magnetic circuit is formed by a gap between the first sidewall 5 and the center magnet, which are made of a magnetic conductive material, and those skilled in the art will understand that the voice coil 22 of the multi-magnetic circuit system may be disposed between the center magnet and the side magnet.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A sound generating device is characterized by comprising a magnetic circuit system, wherein the magnetic circuit system comprises a magnetic conducting yoke and a magnetic circuit part arranged on one surface of the magnetic conducting yoke, a first side wall of the sound generating device encloses and forms a first cavity in the direction opposite to the direction of the magnetic circuit part, and the magnetic conducting yoke and the magnetic circuit part are wrapped by the first side wall; the first side wall is made of a magnetic conductive material;

an opening is formed in the first cavity in the direction away from the magnetic circuit part, a cover plate is arranged on the opening in a sealing mode, and the cover plate is made of a magnetic conductive material;

the first side wall and the magnetic yoke are integrally formed;

the cover plate and the first side wall are integrally formed;

the magnetic circuit system comprises a second cavity arranged in the magnetic circuit system, and one end of the second cavity is communicated with the first cavity; the second cavity comprises a second through hole arranged on the magnetic conductive yoke and a third through hole or a groove which is arranged on the magnetic circuit part and is correspondingly communicated with the second through hole; the second cavity penetrates through the magnetic circuit system, and the other end of the second cavity is communicated with the back surface of the vibrating diaphragm;

the second through hole is arranged in the middle of the magnetic guide yoke;

the magnetic circuit part comprises a magnet and a washer, the washer is arranged on one surface of the magnet, which is far away from the magnetic yoke, a fourth through hole is arranged at a position, which is opposite to the third through hole, of the washer, and the second cavity is communicated with the back surface of the vibrating diaphragm through the fourth through hole, so that the first cavity can be communicated with the back surface of the vibrating diaphragm through the second cavity.

2. The sound generating apparatus of claim 1, wherein a sound absorbing material is disposed within the first cavity.

3. The sound generating apparatus of claim 1, further comprising a vibration system; the vibration system comprises a vibrating diaphragm, the first cavity is communicated with the back face of the vibrating diaphragm, and a breathable isolating piece is arranged between the first cavity and the vibrating diaphragm.

4. The sound generating apparatus of claim 1, wherein the second chamber is filled with a sound absorbing material.

5. The sound generating apparatus according to claim 1, wherein an edge of the magnetic circuit portion abuts against the first side wall, or a voice coil is included in the sound generating apparatus, and the voice coil is disposed between the edge of the magnetic circuit portion and the first side wall.

6. The sound generator of claim 1, wherein the first sidewall is sealingly coupled to the yoke.