CN108566600B

CN108566600B - Sound production device and electronic equipment

Info

Publication number: CN108566600B
Application number: CN201810395846.8A
Authority: CN
Inventors: 赵燕鹏; 房晓斐; 荆都; 王超
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2021-10-08
Anticipated expiration: 2038-04-27
Also published as: CN108566600A

Abstract

The invention discloses a sound generating device and electronic equipment. The device includes sound production monomer, casing and adjusting part, the inside formation of casing holds the chamber, sound production monomer is set up hold the intracavity, and will it separates for preceding sound chamber and back sound chamber to hold the chamber be provided with the intercommunication on the casing back sound chamber and exterior space's through-hole, adjusting part is including covering the elastic diaphragm and the setting of through-hole are in last quality piece of elastic diaphragm, adjusting part is configured to be used for reducing sound generating mechanism's resonant frequency. The adjusting component can improve the low-frequency response of the sound generating device and occupies small internal space.

Description

Sound production device and electronic equipment

Technical Field

The present invention relates to the field of electroacoustic conversion technologies, and in particular, to a sound generating device and an electronic apparatus.

Background

Resonance frequency f of sound generating device₀It has an important influence on the sound performance of the sound generating device. f. of₀The lower the frequency, the better the low frequency performance. For example, in the ear-fitted and half-in-ear headphones, the bass tube structure is often adopted to improve the low-frequency performance. The bass tube is a long and narrow pipeline for communicating the rear sound cavity of the earphone with the external space. The bass tube provides a sound quality and sound volume that allows the earphone to be used at less than the natural f of the cell₀The frequency point of the earphone generates resonance, so that the low-frequency response of the earphone is improved.

However, the bass tube occupies a large internal space while enhancing the low-frequency effect of the earphone, which is not favorable for the miniaturization design of the earphone.

Therefore, it is necessary to provide a technical solution to solve the above technical problems.

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, a sound emitting device is provided. The device includes sound production monomer, casing and adjusting part, the inside formation of casing holds the chamber, sound production monomer is set up hold the intracavity, and will it separates for preceding sound chamber and back sound chamber to hold the chamber be provided with the intercommunication on the casing back sound chamber and exterior space's through-hole, adjusting part is including covering the elastic diaphragm and the setting of through-hole are in last quality piece of elastic diaphragm, adjusting part is configured to be used for reducing sound generating mechanism's resonant frequency.

Optionally, a dustproof mesh cloth is arranged on the outer side of the through hole or in the through hole.

Optionally, the sound generating device is a speaker module or a headset.

Optionally, the sound generating device is an ear-headphone or a semi-in-ear headphone.

Optionally, the elastic membrane is made of at least one of PET, PEEK, PU, TPU, TPEE, TPAE, TPS, TPV, TPO, and TPC.

Optionally, the elastic membrane is circular, elliptical, rectangular or other regular polygonal shape.

Optionally, the casing includes preceding shell and backshell that the lock is in the same place preceding shell with the inside of backshell forms hold the chamber, sound emitting device's sound outlet is located preceding shell, the through-hole is located the backshell, adjusting part is set up on the backshell.

Optionally, the mass block is made of metal, alloy or plastic.

Optionally, the elastic membrane is a planar elastic membrane; or

The elastic diaphragm comprises a central part positioned in the middle, a connecting part positioned at the edge and a folded ring part positioned between the central part and the connecting part, and the cross section of the folded ring part is arc-shaped; or

The elastic diaphragm is of a plane annular structure, and the mass block is fixed on an inner ring of the elastic diaphragm.

Optionally, the mass is bonded to the middle of the elastic membrane by glue.

According to another aspect of the present invention, an electronic device is provided. The electronic equipment comprises the sound generating device provided by the invention.

According to one embodiment of the present disclosure, a through hole is provided on a housing of a sound emitting device. The adjusting component covers the through hole. The adjusting component can respond to the vibrating airflow in the rear sound cavity to vibrate, and the low-frequency effect of the sound production device is improved through the vibration of the adjusting component, so that the resonance frequency f₀Spreading towards lower frequencies.

In particular, the elastic diaphragm can provide an acoustic volume and the mass can provide an acoustic mass. According to the resonant frequency f₀Calculating the formula:

wherein M is the sound quality of the sound generating device, and C is the sound volume of the sound generating device. The adjustment component is equivalent to increasing the inductance in the electro-mechanical-acoustic curve of the sound production device, which leads to f₀Can effectively reduce, and the low-frequency response of the sounding device can be effectively improved.

In addition, because the adjusting component is arranged on the shell wall of the shell, the adjusting component does not occupy the space inside the shell, and is favorable for the structural design inside the sound generating device. For example, the remaining space can accommodate other functional elements, which is in line with the trend of miniaturization, lightness and thinness of electronic devices.

Particularly, the adjusting component is arranged in the ear-attaching earphone or the half-in-ear earphone, so that the low-frequency energy loss can be effectively reduced, and the low-frequency response of the two earphones can be effectively improved.

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 view of a structure of a headset according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a headset according to one embodiment of the invention.

Fig. 3 is an exploded view of a headset according to one embodiment of the invention.

FIG. 4 is a schematic view of an adjustment assembly according to one embodiment of the present invention.

Fig. 5 is a graph comparing frequency response curves of a headset according to an embodiment of the present invention and a headset without an adjustment assembly.

Description of reference numerals:

11: an end cap; 12: a rear housing body; 13: a front housing; 14: a PCB; 15: a battery; 16: an adjustment assembly; 17: an elastic diaphragm; 18: a mass block; 19: a sounding monomer; 20: screen cloth; 21: a through hole; 22: a rear acoustic chamber; 23: a front acoustic chamber; 24: a sound outlet; 25: a rear sound venting hole; 26: a front sound venting hole.

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.

According to one embodiment of the present invention, a sound generating device is provided. Optionally, the sound generating device is a speaker module or a headset. Both of these sound emitting devices have a rear sound chamber 22. The rear acoustic chamber 22 is used to adjust the low frequency effect of the sound generating device.

In particular, the sound generating device is a half-in-ear headphone or an on-ear headphone. Half-in-ear headphones generally do not extend into the ear canal or extend only slightly when worn. The supra-aural earphone covers the ear of the user when worn, and does not extend into the ear canal. Both types of earphones are limited in the way they are worn and do not couple as well to the ear canal as in-ear earphones. The uncontrolled leakage between the semi-in-ear headphone or the in-ear headphone and the ear canal forms a high pass filter, which results in a loss of low frequency energy.

The following description will take the earphone as an example. As shown in fig. 2-3, the sound generating device (e.g., a headset) includes a sound generating unit 19, a housing, and an adjustment assembly 16. The interior of the housing forms a receiving cavity. The sound emitting unit 19 is disposed in the accommodation chamber and divides the accommodation chamber into a front sound chamber 23 and a rear sound chamber 22.

Optionally, the sounding unit 19 is a moving-coil unit or a moving-iron unit. Taking the moving-coil type single body as an example, the front acoustic cavity 23 is located on the side of the diaphragm away from the magnetic circuit system. The back acoustic cavity 22 is located on the side of the diaphragm close to the magnetic circuit. Optionally, the diaphragm is a flat-plate type diaphragm or a folded ring type diaphragm. The front sound chamber 23 communicates with the outside space through the sound outlet hole 24.

Preferably, the sound outlet holes 24 are covered with a mesh 20. The mesh 20 is dust proof and can form an acoustic resistance to adjust the sound effect of the earphone.

A through hole 21 communicating the rear sound chamber 22 with the external space is provided on the housing. The through-hole 21 has, for example, a circular, elliptical, rectangular or the like cross section and penetrates the wall in the thickness direction thereof. As shown in fig. 4, the adjustment assembly 16 includes an elastic diaphragm 17 covering the through hole 21 and a mass 18 provided on the elastic diaphragm 17. Preferably, the mass 18 is arranged in the middle of the elastic membrane 17, so as to make the adjustment action of the adjustment assembly 16 more precise. The adjustment assembly 16 is configured for reducing the resonance frequency, f, of the sound generating device₀。

The elastic diaphragm 17 has a set acoustic capacity. The acoustic capacitance, also called the compliance coefficient, is the inverse of the stiffness coefficient of a material. The outer edge of the elastic membrane 17 is glued to the wall of the through hole 21 or to the inner wall of the housing.

The mass 18 has a set mass. The acoustic mass of the adjustment assembly can be adjusted by adjusting the mass of the mass 18. The mass 18 is fixed to the middle of the elastic membrane 17, for example by means of glue. The adjustment assembly 16 may be located at an end of the through bore 21 or within the through bore 21. The mass 18 may also be injection molded to the middle of the elastic diaphragm 17 by insert molding.

In the embodiment of the present invention, a through hole 21 is provided on the housing of the sound generating device. The adjustment assembly 16 covers the through hole 21. The tuning assembly 16 is capable of vibrating in response to the vibrating airflow within the rear acoustic chamber 22. The adjusting component adjusts the medium and low frequency performance of the sound generating device by providing sound quality and cooperating with the compliance of the sound generating monomer and the compliance of the rear sound cavity.

In particular, the elastic diaphragm 17 can provide compliance and the mass 18 can provide acoustic mass. According to the resonant frequency f₀Calculating the formula:

wherein M is the sound quality of the sound generating device, and C is the sound volume of the sound generating device. The adjustment member 16 is equivalent to an increase in inductance in the electro-mechanical-acoustic curve of the sound generating device, which results in f₀The low-frequency response of the sound generating device can be effectively improved.

Fig. 5 is a graph comparing frequency response curves of a headset according to an embodiment of the present invention and a headset without the adjustment assembly 16. Wherein the abscissa represents frequency in Hz; the ordinate is the sound pressure level in decibels (dB). A is a frequency response curve of the headset of one embodiment of the invention; b is the frequency response curve of the earphone without the adjustment assembly 16.

As can be seen from fig. 5, at frequencies above 300Hz, the two curves substantially coincide. This means that the frequency response curve of the adjustment assembly 16 for medium and high frequencies is not much affected. But at frequencies less than 300Hz, curve a is above curve B, which indicates that the sound pressure level of the earphone of the embodiment of the present invention is significantly higher at low frequencies than the sound pressure level of the earphone without the adjustment assembly 16. Also, the lower the frequency, the more the sound pressure level of the headset of embodiments of the present invention is higher than the sound pressure level of a headset without the adjustment assembly 16. It can be seen that the adjusting assembly 16 of the present embodiment can effectively improve the low frequency response of the sound generating device.

In addition, since the adjusting assembly 16 is disposed on the wall of the housing, it does not occupy the space inside the housing, thereby facilitating the structural design inside the sound generating device. For example, the remaining space can accommodate other functional elements, which is in line with the trend of miniaturization, lightness and thinness of electronic devices.

Particularly, the adjusting component 16 is arranged in an ear-attaching earphone or a half-in-ear earphone, so that the low-frequency energy loss can be effectively reduced, and the low-frequency response of the two earphones can be effectively improved.

In one example, a dust screen cloth is provided outside the through-holes 21 or inside the through-holes 21. Dustproof screen cloth can prevent effectively that outside dust from getting into accommodation space. Preferably, the mesh size of dustproof screen cloth should make dustproof screen cloth to the resistance of sound air current as little as possible, avoid producing big acoustic resistance.

Alternatively, the elastic membrane 17 is made of at least one of PET (polyester resin), PEEK (polyether ether ketone), PU (polyurethane), TPU (thermoplastic polyurethane elastomer), TPEE (thermoplastic polyester elastomer), TPAE (nylon 6 thermoplastic elastomer), TPS (styrene thermoplastic elastomer), TPV (dynamically vulcanized thermoplastic elastomer), TPO (olefin thermoplastic elastomer), and TPC (thermoplastic matrix composite). The material has large sound volume and good compliance, and can effectively improve the low-frequency effect of the sound generating device.

Alternatively, the elastic diaphragm 17 is circular, elliptical, rectangular or other regular polygonal shape. For example, other regular polygons are regular triangles, regular pentagons, regular hexagons, and the like. The skilled person can select the desired one according to the actual need.

In one example, the elastic membrane 17 is a planar elastic membrane. The outer edge of the planar elastic membrane is connected with the shell. For example by glue. The middle portion is used to hold the mass 18. The elastic membrane 17 has a simple structure and is easy to manufacture.

Alternatively, the elastic membrane 17 includes a central portion at the center, a connecting portion at the edge, and a corrugated portion between the central portion and the connecting portion. The cross section of the folded ring part is arc-shaped. I.e. the elastic membrane 17 is a corrugated diaphragm. The bending ring part can improve the vibration effect of the elastic diaphragm 17, thereby further improving the low-frequency response of the sound production device. The connecting part is used for being connected with the shell. The mass 18 is fixed in the center. The mass 18 is fixed, for example by glue.

It is also possible that the elastic membrane 17 is of a planar annular configuration. The mass 18 is fixed to the inner ring of the elastic diaphragm 17. The outer edge of the elastic membrane 17 is connected to the housing. For example by glue. Compared with a plane type elastic membrane, the plane annular structure saves raw materials.

Optionally, the mass 18 is made of metal, alloy or plastic. For example, metal materials and alloy materials are generally formed by stamping, such as aluminum foil, magnesium aluminum alloy, titanium alloy, and the like. Plastic materials are generally formed by stamping or injection molding, such as PET (polyester resin), PEN (polyethylene naphthalate), PI (polyimide), PEEK (polyetheretherketone), and the like. The shape of the mass 18 may be circular, elliptical, rectangular, or other regular polygonal shape.

The person skilled in the art adjusts the resonant frequency f of the sound generating device by adjusting the acoustic capacity of the elastic diaphragm 17 and the mass of the mass 18₀。

In one example, as shown in FIG. 1, the housing includes a front shell 13 and a rear shell that snap together. A receiving chamber is formed inside the front case 13 and the rear case. The sound outlet hole 24 of the sound emitting device is located in the front case 13. The through hole 21 is located in the rear case (e.g., the rear case body 12). The adjustment assembly 16 is disposed on the rear housing (e.g., the rear housing body 12).

For example, as shown in fig. 2-3, a front shell 13 of the headset. The sound outlet hole 24 is opened at a side portion of the front case 13. The mesh cloth 20 is disposed in the sound outlet holes 24. The front case 13 further includes a front sound discharge hole 26 communicating the front sound chamber 23 with the external space.

Disposed within the rear housing of the headset is a PCB14 and a battery 15. The front shell 13 and the rear shell snap together. The single head of sound production is located and holds the intracavity. The split design of the shell facilitates the installation of the sounding unit 19. For example, the two are joined by glue. The sounding unit 19 is located in the accommodation space. The battery 15 is connected with the sound emitting unit 19 through the PCB 14. The PCB14 also has a microphone integrated therewith. The end cap 11 of the rear housing is provided with a microphone aperture opposite the microphone.

The rear housing includes a rear housing body 12 and an end cap 11. The rear housing body 12 has a cylindrical structure. The end cap 11 is separated from the rear case body 12. When installed, the battery 15 and PCB14 are first secured within the rear housing body 12, and then the end cap 11 is attached to the rear housing body 12. The PCB14 is closer to the end cap than the cell. This facilitates the mounting of the battery 15 and PCB 14.

A rear sound leakage hole 25 for communicating the rear sound chamber 22 with the external space is provided on the rear case body 12. The rear sound venting holes 25 enable further adjustment of the low frequency effect of the sound generating device.

According to another embodiment of the present invention, an electronic device is provided. For example, the electronic device is a mobile phone, a television, a computer, an interphone, a game machine, a VR device, an AR device, a learning machine, a smart watch, a telephone, or the like.

The electronic equipment comprises the sound generating device provided by the invention. For example, the sound generating device is fixed within a housing of the electronic device.

The electronic equipment has the characteristic of good low-frequency effect.

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 sound production unit, a shell and an adjusting assembly, wherein a containing cavity is formed in the shell, the sound production unit is arranged in the containing cavity and divides the containing cavity into a front sound cavity and a rear sound cavity, a through hole for communicating the rear sound cavity with an external space is formed in the shell, the through hole penetrates through the shell wall along the thickness direction of the shell wall, the adjusting assembly comprises an elastic diaphragm covering the through hole and a mass block arranged on the elastic diaphragm, and the adjusting assembly is configured for reducing the resonance frequency of the sound production device;

the adjustment assembly is disposed on a wall of the housing.

2. The sound generating apparatus according to claim 1, wherein a dust-proof mesh is provided outside the through hole or inside the through hole.

3. The sound generating device of claim 1, wherein the sound generating device is a speaker module or an earphone.

4. The sound generating device of claim 1, wherein the sound generating device is an in-ear headphone or a semi-in-ear headphone.

5. The sound generating apparatus as claimed in claim 1, wherein the elastic membrane is made of at least one of PET, PEEK, PU, TPU, TPEE, TPAE, TPS, TPV, TPO and TPC.

6. The sound generating apparatus of claim 1, wherein the elastic membrane is circular, oval, rectangular or other regular polygon.

7. The sound generating apparatus as claimed in claim 1, wherein the housing comprises a front shell and a rear shell fastened together, the receiving cavity is formed inside the front shell and the rear shell, the sound outlet of the sound generating apparatus is located in the front shell, the through hole is located in the rear shell, and the adjusting assembly is disposed on the rear shell.

8. The sound generating apparatus of claim 1, wherein the mass is made of metal, alloy or plastic.

9. The sound generating apparatus according to claim 1, wherein said elastic diaphragm is a flat-type elastic diaphragm; or

10. An electronic device, characterized in that it comprises a sound emitting device according to any one of claims 1-9.