WO2018170940A1

WO2018170940A1 - Sound-generating device and electronic apparatus

Info

Publication number: WO2018170940A1
Application number: PCT/CN2017/078749
Authority: WO
Inventors: 汲鹏程
Original assignee: 歌尔股份有限公司
Priority date: 2017-03-20
Filing date: 2017-03-30
Publication date: 2018-09-27
Also published as: CN106954148A; CN106954148B

Abstract

Disclosed are a sound-generating device and an electronic apparatus, the sound-generating device comprising a housing and a vibrating system, with the vibrating system comprising a vibrating flat plate (6), wherein the vibrating flat plate (6) is hermetically mounted on a mounting end face of the housing by means of a circle of ring-shaped elastic body; and the vibrating flat plate (6) and the elastic body (7) divide an inner cavity of the housing into a front sound cavity and a rear sound cavity, with both being separated from each other. The sound-generating device can increase, by means of the elastic body (7), the vibration amplitude of the vibrating flat plate, thereby improving the low-frequency performance of the sound-generating device; in addition, with the aid of the advantage of high frequency of the vibrating flat plate (6) itself, the vibration frequency band of the vibrating flat plate (6) can be broadened, so that the high-frequency performance is increased to a certain extent. The sound-generating device removes the designs of a foldable ring and a pattern in a traditional vibrating diaphragm, and increases the effective vibrating area, thereby improving the sound-generating performance; and the vibrating flat plate (6) and the elastic body (7) are manufactured separately, making the process easier to control, preventing the generation of polarization, and improving the problem of damaging a diaphragm under a large displacement.

Description

Sounding device and electronic device

Technical field

The present invention relates to the field of electroacoustic conversion, and more particularly to a sound emitting device such as a speaker, a receiver, etc.; the present invention also relates to an electronic device.

Background technique

A sounding device is an important acoustic component in an electronic device that is a transducer that converts an electrical signal into an acoustic signal. A conventional sounding device includes a housing, and a magnetic circuit system disposed within the housing and a vibration system including a diaphragm and a voice coil disposed under the diaphragm. The voice coil drives the diaphragm to make sounds under the vibration of the magnetic circuit system.

The existing sounding devices adopt the design structure of the diaphragm ring with a folding ring. The folding ring structure not only reduces the effective vibration area of the diaphragm, but also is not conducive to the full utilization of the space. Moreover, in the process of forming the diaphragm, due to The difference between the vibration part of the diaphragm and the structure of the folding ring makes the consistency of the two forms poor, which easily leads to the nonlinear polarization of the diaphragm. In addition, the diaphragm fold ring and the pattern structure are easily broken at a large amplitude, resulting in poor product.

Summary of the invention

It is an object of the invention to provide a new technical solution for a sounding device.

According to a first aspect of the present invention, there is provided a sounding device comprising a housing, a vibration system, the vibration system comprising a vibration plate, the vibration plate being mounted on a mounting end surface of the housing by a ring of an annular elastomer seal The vibrating plate and the elastic body divide the inner cavity of the casing into a front acoustic cavity and a rear acoustic cavity which are isolated from each other.

Optionally, the elastic body has a circular arc shape in cross section.

Optionally, the elastomer is a tubular shape having a hollow lumen.

Optionally, a pressure relief hole connecting the rear acoustic cavity and the hollow hollow cavity of the elastic body is disposed on an inner wall of the tubular elastic body.

Optionally, the number or/and the aperture or/and the distribution position of the relief holes on the opposite side walls of the tubular elastomer are different.

Optionally, the vibrating plate is bonded to the upper end surface of the elastic body, and the lower end surface of the elastic body is adhered to the mounting end surface of the housing.

Optionally, a magnetic circuit system is further included, the magnetic circuit system includes a magnetic gap formed by a magnet, the vibration system further includes a voice coil mounted at a lower end of the vibration plate, and a magnetic end of the voice coil and a magnetic circuit of the magnetic circuit system The gap fits together.

Optionally, the magnetic circuit system includes a yoke, a central magnet mounted on the yoke, and a side magnet, and further includes a center washer disposed on the upper end surface of the center magnet, and a side washer disposed on the upper end surface of the side magnet The magnetic gap is composed of a side magnet and a center magnet.

Optionally, the vibrating plate has a shape of a rectangle, a circle, a racetrack or an ellipse, and the shape of the elastic body matches the shape of the vibrating plate.

According to another aspect of the present invention, there is also provided an electronic device comprising the above-described sounding device.

In the sounding device of the present invention, the vibrating plate is connected to the casing through the elastic body, which not only facilitates the sealing separation of the front acoustic cavity and the rear acoustic cavity, but also increases the vibration amplitude of the vibrating plate through the elastic body, and improves the low frequency performance of the sounding device; The high-frequency advantage of the vibrating plate itself can widen the frequency band of the vibrating plate vibration and improve the high-frequency performance to a certain extent. The sounding device of the invention eliminates the folding ring and pattern design of the traditional diaphragm, increases the effective vibration area, and improves the sounding performance; the vibration plate and the elastic body are separately manufactured, so that the process is easier to control and avoid the generation of polarization. Problems such as membrane rupture under large displacement have also been improved.

The inventors of the present invention have found that in the prior art, the folding ring structure not only reduces the effective vibration area of the diaphragm, but also is not conducive to the full utilization of the space; moreover, in the process of forming the diaphragm, due to the vibrating portion of the diaphragm and The difference in the structure of the folded ring makes the consistency of the two forms poor, which easily leads to the nonlinear polarization of the diaphragm. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.

Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

DRAWINGS

The accompanying drawings, which are incorporated in FIG

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing a sound emitting device of the present invention.

2 is a schematic view showing the cooperation structure of the vibrating plate and the elastic body of the present invention.

detailed description

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

The following description of the at least one exemplary embodiment is merely illustrative and is in no way

Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques and devices should be considered as part of the specification.

In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

Referring to Figures 1 and 2, the present invention provides a sounding device that includes a housing, a vibration system, and an actuation system that mates with the vibration system. The casing of the present invention may include an upper casing 10, a middle casing 11, and a lower casing 12, and the upper casing 10, the middle casing 11, and the lower casing 12 are fastened together to form a casing having an inner cavity. The end surface of the upper casing 10 is also covered with an end cover 9 , and the end cover 9 is provided with an acoustic hole structure and the like. The matching structure between the housings depends on the type of the sound generating device and the design requirements, which belongs to the field. The common knowledge of the skilled person is not specifically described here.

The vibration system of the present invention includes a vibrating plate 6 which employs a planar plate structure which does not have a folding ring structure of a conventional diaphragm or the like. The vibrating plate 6 may be a ball top material well known to those skilled in the art, such as an aluminum coated, PN or PET composite or the like. Due to the vibration plate The shape of the rule is 6, so the manufacturing process is more controllable.

Also included is an elastomer 7, which is sealedly mounted on the mounting end face of the housing by the elastomer 7 with reference to Figures 1 and 2. The elastomer 7 may be made of an elastic material well known to those skilled in the art including, but not limited to, elastomeric materials such as PEEK, TPU, PU, PEN, silica gel, or elastomeric diaphragm materials or composite PEEK materials.

The elastic body 7 has an annular shape as a whole, which matches the shape of the vibrating plate 6. For example, when the vibrating plate 6 selects a rectangle, the elastic body 7 has a rectangular ring shape matched thereto, so that the edge position of the vibrating plate 6 can be sealedly connected to the mounting end face of the casing by the elastic body 7. The vibrating plate 6 can also be selected from a circular, elliptical, racetrack shape or other shape well known to those skilled in the art and will not be described in detail herein.

At the time of installation, the lower end surface of the vibrating plate 6 may be adhered to the upper end surface of the elastic body 7 by glue, and the lower end surface of the elastic body 7 is adhered to the mounting end surface of the housing by glue, through the ring shape. The elastomer 7 thus makes it possible to achieve a sealed mounting of the vibrating plate 6 with the housing. At this time, the vibrating plate 6 and the elastic body 7 separate the inner cavity of the casing into the front acoustic cavity and the rear acoustic cavity which are isolated from each other. The structure of the front acoustic cavity and the rear acoustic cavity in the sounding device belongs to common knowledge of those skilled in the art. It will not be specified here.

The elastic body 7 of the present invention provides an elastic force for the vibration of the vibrating plate 6, which is equivalent to a folding ring in the conventional diaphragm structure. In a specific embodiment of the present invention, the elastic body 7 may have a circular cross section, for example, a semicircular shape or a C shape. In another specific embodiment of the invention, the elastomer 7 is tubular having a hollow lumen, such as a rectangular tube or a circular tube or the like. Since the elastic body 7 is produced separately from the vibrating plate 6, the manufacturing process of the elastic body 7 can be made to have a good consistency, especially when the shape of the elastic body 7 is relatively regular.

As described above, the elastic body 7 of the present invention preferably employs a tubular elastic body, for example, a rectangular pipe or a circular pipe. This structure has a good consistency in the forming process of the pipe and is relatively easy to control.

Further preferably, a pressure relief hole 70 is provided on the inner wall of the tubular elastic body 7 to communicate the hollow cavity of the rear acoustic cavity and the elastic body 7, with reference to FIG. The back sound chamber is communicated with the hollow inner cavity of the elastic body 7 through the pressure relief hole 70, so that the pressure of the hollow inner cavity and the rear sound cavity of the elastic body 7 during the vibration process can be balanced, thereby improving the vibration effect of the elastic body 7. . Moreover, by adjusting the number of the pressure relief holes 70 and the size of the aperture, the purpose of adjusting the compliance of the entire vibration system can be achieved. For example, the larger the number of pressure relief holes 70, the larger the aperture, and the smaller the resistance that the elastic body 7 receives when vibrating.

In another preferred embodiment of the invention, the number or/and the aperture or/and the distribution position of the relief holes 70 on the opposite side walls of the tubular elastomer 7 are different. For example, when the elastic body 7 selects a rectangular annular structure, the number, the aperture, and the distribution position of the pressure relief holes 70 on the two short side walls are different, and the number of the pressure relief holes 70 on the two long side walls thereof is different. The aperture and distribution position are different. By adjusting the number or/and the aperture or/and the distribution position of the pressure relief hole 70, the asymmetry of the entire vibration system can be adjusted, and the asymmetry of the complex housing and the cavity can be adjusted, so that the entire sounding device can be adjusted. The vibration system reaches an equilibrium state, thereby improving the polarization of the vibration system caused by the asymmetry of the structure and the cavity, and effectively solving the problem of rubbing and noise caused by polarization and polarization which are easy to occur under low frequency and large displacement, and satisfying the long time. High-intensity work requirements increase the reliability of the sounding device.

In the sounding device of the present invention, the actuation system can be either a moving coil type or a moving iron type. Both of these actuation modalities are well known to those skilled in the art. Here, the present invention describes the sounding device of the present invention in a moving coil type of actuation.

Referring to Figure 1, the sounding device of the present invention has an actuation system that is a magnetic circuit system that includes a magnetic gap formed by a magnet and a washer positioned above the magnet. The magnetic circuit system may be a single magnetic circuit, a dual magnetic circuit, or other magnetic circuit structures well known to those skilled in the art.

In a specific embodiment of the invention, the magnetic circuit system may comprise a yoke 1, a central magnet 2, which may be mounted in the central portion of the yoke 1 in a manner well known to those skilled in the art. A center washer 3 is further disposed at an upper end of the center magnet 2. Magnetic circuit system also includes The side magnet 4 is disposed around the central magnet 2, and the side magnet 4 is surrounded by a ring shape which can be fixed to the yoke 1 by means well known to those skilled in the art. The side magnet 5 is provided on the side magnet 4, and the shape of the edge washer 5 matches the shape of the side magnet 4. An annular magnetic gap is formed between the center magnet 2 and the side magnet 4.

The vibration system further includes a voice coil 8 mounted on the lower end of the vibrating plate 6, and the upper end of the voice coil 8 can be fixed to the vibrating plate 6 by bonding, for example, and the other end is engaged with the magnetic gap of the magnetic circuit system. together. During operation, the energized voice coil 8 drives the vibrating plate 6 to vibrate and vocalize by the cooperation of the magnetic circuit system. This principle of sounding is common knowledge of those skilled in the art and will not be specifically described herein.

The sounding device of the present invention can be applied to various electronic devices. To this end, the present invention also provides an electronic device including the above-described sounding device. The electronic device may be a mobile phone, a computer, a player, an audio, or the like, which is well known to those skilled in the art, and has an audible function.

While the invention has been described in detail with reference to the specific embodiments of the present invention, it should be understood that It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

A sounding device, comprising: a casing, a vibration system, the vibration system comprising a vibration plate (6), the vibration plate (6) being sealed and mounted on the casing by a ring of annular elastic body (7) The vibrating plate (6) and the elastic body (7) divide the inner cavity of the casing into a front acoustic cavity and a rear acoustic cavity which are isolated from each other.
The sounding device according to claim 1, characterized in that the elastic body (7) has an arc shape in cross section.
The sounding device according to claim 1, characterized in that the elastic body (7) is a tubular shape having a hollow inner cavity.
The sounding device according to claim 3, characterized in that a relief hole (70) is provided on the inner wall of the tubular elastic body (7) to communicate the hollow cavity of the rear acoustic cavity and the elastic body (7). .
A sounding device according to claim 4, characterized in that the number or/and the aperture or/and the distribution position of the pressure relief holes (70) on the opposite side walls of the tubular elastic body (7) are different.
The sounding device according to claim 1, characterized in that the vibrating plate (6) is bonded to the upper end surface of the elastic body (7), and the lower end surface of the elastic body (7) is bonded to the housing. On the end face.
A sounding device according to claim 1, further comprising a magnetic circuit system including a magnetic gap formed by a magnet, said vibration system further comprising a voice coil mounted at a lower end of the vibration plate (6) (8) The lower end of the voice coil (8) is fitted with the magnetic gap of the magnetic circuit system.
A sounding device according to claim 7, wherein said magnetic circuit system comprises a yoke (1), a center magnet (2) mounted on the yoke (1), and a side magnet (4), and further comprising a central washer (3) disposed on an upper end surface of the center magnet (2), and a side washer (5) disposed on an upper end surface of the side magnet (4); the magnetic gap is composed of a side magnet (4) and a center magnet (2) ) constitutes.
The sounding device according to claim 1, characterized in that the shape of the vibrating plate (6) is rectangular, circular, racetrack or elliptical, and the shape of the elastic body (7) and the vibrating plate (6) The shape matches.
An electronic device comprising the sound emitting device according to any one of claims 1 to 9.