CN108668207B

CN108668207B - Sound production device

Info

Publication number: CN108668207B
Application number: CN201810374578.1A
Authority: CN
Inventors: 刘岩涛; 朱婷
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-04-24
Filing date: 2018-04-24
Publication date: 2020-09-22
Anticipated expiration: 2038-04-24
Also published as: CN108668207A; WO2019205719A1

Abstract

The invention discloses a sound generating device, which comprises a magnetic circuit system and a vibration system, wherein the magnetic circuit system comprises a magnetic yoke, a magnet and a washer which are sequentially arranged, the magnet and the washer form a magnetic circuit part, and the side wall of the sound generating device is enclosed to form a first cavity in the direction opposite to the magnetic circuit part on the magnetic yoke; the guide yoke or/and be provided with a plurality of first through-holes on the china department, be provided with sound absorbing material in the first cavity, the aperture of first through-hole is less than sound absorbing material's material footpath. According to one embodiment of the disclosure, when the sound-absorbing material is arranged in the rear cavity, the sound-absorbing material is isolated without using a breathable isolation material such as mesh cloth.

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 sound generating device has a large number of structural components, and the sound generating device is more and more miniaturized, and the assembly difficulty among the structural components is increased.

Therefore, a sound generating device with a novel structure is needed, and the sound generating device has a small size and can have good performance, or structural components in the sound generating device can be reduced, so that the assembly difficulty is reduced, and the development requirement of electronic products is met.

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 invention, a sound generating device is provided, which comprises a magnetic circuit system and a vibration system, wherein the magnetic circuit system comprises a magnetic yoke, a magnet and a washer which are sequentially arranged, the magnet and the washer form a magnetic circuit part, and a first cavity is enclosed by the side wall of the sound generating device in the direction opposite to the magnetic circuit part on the magnetic yoke;

the guide yoke or/and be provided with a plurality of first through-holes on the china department, be provided with sound absorbing material in the first cavity, the aperture of first through-hole is less than sound absorbing material's material footpath.

Optionally, the magnetic yoke is provided with a second through hole, the magnet is correspondingly provided with a third through hole communicated with the second through hole, and the second through hole and the third through hole form a second cavity communicated with the first cavity.

Optionally, a portion of the washer corresponding to the third through hole is provided with a plurality of first through holes.

Optionally, a blocking wall is disposed at an edge of the magnetic yoke, and a side wall enclosing the first cavity includes the blocking wall.

Optionally, the blocking wall is integrally formed with the magnetic yoke.

Optionally, the first cavity is enclosed by the blocking wall.

Optionally, a vertical projection of the magnetic circuit portion is equal to or smaller than a vertical projection of the yoke.

Optionally, a vertical projection of the magnetic circuit portion is smaller than a vertical projection of the yoke, and a plurality of the first through holes are provided on a region of the yoke larger than the magnetic circuit portion.

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.

Optionally, the vibration system is disposed in the housing, and the housing is hermetically connected to the magnetic circuit system.

According to one embodiment of the disclosure, when the sound-absorbing material is arranged in the rear cavity, the sound-absorbing material is isolated without using a breathable isolation material such as mesh cloth.

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 one embodiment of the present invention;

FIG. 3 is a schematic top view of a first chamber according to an embodiment of the present invention;

FIG. 4 is an exploded view of a structure according to an embodiment of the present invention;

in the figure: the magnetic circuit comprises a magnetic circuit system 1, a magnetic yoke 11, a baffle wall 12, a magnetic circuit part 13, a magnet 14, a washer 15, a first through hole 16, a vibration system 2, a vibrating diaphragm 21, a first cavity 3, a cover plate 31, a shell 4, a second cavity 5, a second through hole 51 and a third through hole 52.

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 comprises a magnetic circuit system 1 and a vibration system 2 as shown in figures 1-4. The magnetic circuit system 1 comprises a magnetic yoke 11, a magnet 14 and a washer 15 which are arranged in sequence. The magnet 14 and washer 15 constitute a magnetic circuit portion 13.

On the magnetic yoke 11 in the direction opposite to the magnetic circuit part 13, the side wall of the sound generating device encloses to form a first cavity 3, that is, on the other surface of the magnetic yoke 11 opposite to the surface provided with the magnetic circuit part 13, the side wall of the sound generating device and the magnetic yoke 11 form a bowl-shaped structure with the magnetic yoke 11 as the bottom, and the bowl-shaped hollow area is the first cavity 3. The side wall of the sound generating device is of a structure forming the surface of the sound generating device, and can comprise a shell of the sound generating device for receiving or fixing internal components, and also can comprise components exposed out of the sound generating device, so that the surface of the sound generating device can be formed.

The guide yoke 11 or/and be provided with a plurality of first through-holes 16 on the china department 15, first cavity 3 with the back of vibrating diaphragm 21 passes through in the vibration system 2 first through-hole 16 intercommunication is kept away from at first cavity 3 after the one end of guide yoke 11 is sealed, first cavity 3 can become sound generating mechanism's back chamber for realize sound generating mechanism's acoustic performance.

Be provided with sound absorbing material 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. The aperture of the first through hole 16 is smaller than the material diameter of the sound-absorbing material, so that other partition parts such as a breathable partition part are not required to be arranged, and the sound-absorbing material is prevented from directly contacting with the vibrating diaphragm 21 to influence the vibration effect of the vibrating diaphragm 21 and influence the performance of the sound-generating device; on the other hand, the internal parts and the assembly difficulty of the sound generating device are simplified, and the integration of the sound generating device is improved.

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 to 4, the magnetic yoke 11 is provided with a second through hole 51, the magnet 14 is correspondingly provided with a third through hole 52 communicated with the second through hole 51, the second through hole 51 and the third through hole 52 form a second cavity 5 communicated with the first cavity 3, the volume of the back cavity of the sound generating device can be increased, and more sound absorbing materials can be provided, which is beneficial to improving the acoustic performance of the sound generating device.

Optionally, as shown in fig. 1 to 4, a portion of the washer 15 corresponding to the third through hole is provided with a plurality of the first through holes 16, so that the first cavity 3 can communicate with the back surface of the diaphragm 21 in the vibration system 2 through the second cavity 5.

Optionally, the second through hole 51 is larger than or equal to the third through hole 52.

Alternatively, as shown in fig. 1 to 4, 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 through hole is formed by laser processing. In other embodiments, the yoke 11 and/or the washer 15 may be integrally formed or processed by other processing methods, which is not limited in this application.

Alternatively, as shown in fig. 1-4, the rim of the magnetic yoke 11 is provided with a baffle wall 12, and the side wall enclosing the first cavity 3 comprises the baffle wall 12, i.e. the baffle wall 12 can constitute the surface of the sound generating device. The blocking wall 12 can be made of a magnetic conductive material the same as that of the magnetic conductive yoke 11, and the magnetic conductive material has higher strength compared with a common injection molding material, and can be thinner under the same strength, which is beneficial to improving the internal volume of the first cavity 3.

Optionally, as shown in fig. 1 to 4, the blocking wall 12 is integrally formed with the magnetic yoke 11, which is beneficial to improve the integration of the first cavity 3 and the integration of the sound generating device, reduce structural parts, and improve the structural stability and the sealing performance of the first cavity 3 to the maximum extent, so as to ensure the acoustic performance thereof; alternatively, the blocking wall 12 may be hermetically welded to the edge of the magnetic yoke 11, which is not limited in the present application.

Optionally, the first cavity 3 is formed by enclosing the blocking wall 12, and the blocking wall 12 may be a side wall of the sound generating device, so that the magnetic yoke can be maximized without exceeding the sound generating device. When the magnetic yoke 11 and the baffle wall 12 are integrally formed, the first cavity 3 is also integrally formed, the sealing performance is good, and the integration degree of the sound generating device is high. In other embodiments, the blocking walls 12 may not be all the side walls of the sound generating device, for example, the blocking walls 12 are all disposed at the edges of the magnetic yoke 11 shown in fig. 1 to 4, but other structures may be disposed at the gap for filling, and therefore, whether the blocking walls 12 are all the side walls of the sound generating device does not limit the present invention.

Optionally, the vertical projection of the magnetic yoke 11 is equal to or smaller than the vertical projection of the whole sound generating device. As will be understood by those skilled in the art, the size relationship of the vertical projection may refer to the corresponding relationship of the outer edge of the vertical projection. When the vertical projection of the magnetic conducting yoke 11 is equal to the vertical projection of the sound generating device, the magnetic conducting yoke 11 can be maximized under the condition that the magnetic conducting yoke 11 does not exceed the sound generating device, so that the internal space of the first cavity 3 can be maximized. On the other hand, the sounding device can be made into a regular shape similar to a cuboid and the like, and all the components are stacked and arranged, so that the assembly and the separation are convenient; when each subassembly that stacks adopted metal material, can connect it through laser welding, it is slight to improve sound generating mechanism's assembly, strengthens sound generating mechanism's heat dispersion.

Alternatively, the perpendicular projection of the magnetic circuit portion 13 is equal to or smaller than the perpendicular projection of the yoke 11. When the magnetic circuit portion 13 is substantially as wide as the magnetic yoke 11 as seen from the cross section of fig. 2, compared to the conventional method in which the magnetic yoke 11 is accommodated inside the sound generating device and is wrapped by the housing of the sound generating device, the present invention can enlarge the magnetic circuit system 1 in the sound generating device without changing the volume of the sound generating device, and at least can omit the thickness of the side wall of the housing to enlarge the magnetic circuit system 1, thereby improving the performance of the sound generating device; in other words, the volume of the sound generating device can be reduced without reducing the volume of the primary magnetic circuit system 1, and the sound generating device can be miniaturized.

Alternatively, as shown in fig. 3 to 4, the perpendicular projection of the magnetic circuit portion 13 is smaller than the perpendicular projection of the magnetic yoke 11, and a plurality of first through holes 16 are provided on the magnetic yoke 11 in a region larger than the magnetic circuit portion 13, so that the first cavity 3 can communicate with the back surface of the diaphragm 21 in the vibration system 2 through the first through holes 16.

Alternatively, as shown in fig. 1 to 4, the first cavity 3 has an opening in a direction away from the magnetic circuit portion 13, and a cover plate 31 is hermetically disposed on the opening for closing the first cavity 3 and ensuring the acoustic function of the first cavity 3. In other embodiments, the cover plate 31 may not be provided, and the open side of the first cavity 3 of the magnetic circuit system 1 may be directly sealed 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.

Optionally, the cover plate 31 is a metal plate, which is beneficial to reducing the thickness and increasing the internal volume of the first cavity 3; and the heat radiation performance of the sound production device is improved.

Optionally, as shown in fig. 1-4, a casing 4 is further included, the vibration system 2 is disposed in the casing 4, and the casing 4 is hermetically connected with the magnetic circuit system 1 to form a main structure of the sound generating device.

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 production device is characterized by comprising a magnetic circuit system and a vibration system, wherein the magnetic circuit system comprises a magnetic yoke, a magnet and a washer which are sequentially arranged, the magnet and the washer form a magnetic circuit part, and the side wall of the sound production device is enclosed into a first cavity in the direction opposite to the magnetic circuit part on the magnetic yoke;

a plurality of first through holes are formed in the magnetic guide yoke or/and the washer, sound-absorbing materials are arranged in the first cavity, and the aperture of each first through hole is smaller than the material diameter of each sound-absorbing material;

a baffle wall is arranged at the edge of the magnetic guide yoke, and the side wall enclosing the first cavity comprises the baffle wall;

the first cavity is formed by enclosing the blocking wall, and the blocking wall and the magnetic conduction yoke are integrally formed.

2. The sounding device according to claim 1, wherein the magnetic yoke is provided with a second through hole, the magnet is correspondingly provided with a third through hole communicated with the second through hole, and the second through hole and the third through hole form a second cavity communicated with the first cavity.

3. The sound production device according to claim 2, wherein a portion of the washer corresponding to the third through hole is provided with a plurality of the first through holes.

4. The sound generating apparatus according to claim 1, wherein a vertical projection of said magnetic circuit portion is equal to or smaller than a vertical projection of said yoke.

5. The sound generating apparatus according to claim 4, wherein a vertical projection of the magnetic circuit portion is smaller than a vertical projection of the yoke, and a plurality of the first through holes are provided on an area of the yoke larger than the magnetic circuit portion.

6. The sound generating apparatus as claimed in claim 1, wherein 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.

7. The sound generating apparatus as claimed in claim 1, further comprising a housing, wherein the vibration system is disposed in the housing, and the housing is hermetically connected to the magnetic circuit system.