CN210112267U - Sound production device - Google Patents

Abstract

The utility model discloses a sound production device. This sound generating mechanism includes casing and sound production monomer, the inside of casing has the cavity, sound production monomer is set up in the cavity, sound production monomer's vocal portion will the cavity is separated for preceding sound chamber and back sound chamber the back sound intracavity intussuseption is filled with sound absorbing material, sound absorbing material includes the adsorbed layer that is formed by the non-foaming sound absorption granule and is formed by directional adsorption granule, the sound absorbing layer with the adsorbed layer sets up in turn. The oriented adsorption particles can effectively solve the technical problem of irreversible aging failure of the non-foamed sound-absorbing particles in use.

Description

Sound production device

Technical Field

The utility model relates to an electroacoustic conversion technology field, more specifically relates to a sound generating mechanism.

Background

The speaker module is used as an energy converter for converting an electric signal into an acoustic signal. The speaker module generally includes a housing and a speaker unit. The inner cavity of the shell is divided into a front sound cavity and a rear sound cavity by the loudspeaker monomer. To improve the acoustic performance of the speaker module, for example, to lower the resonant frequency Fo of the module, to expand the bandwidth, etc., sound absorbing members are often added to the rear acoustic cavity. The sound absorbing piece absorbs partial sound energy, equivalently virtually expands the volume of the rear cavity and the like, so that the Fo effect of the loudspeaker module is reduced.

The traditional sound absorbing piece is foam, such as polyurethane, melamine and the like. With the increasingly thinner electronic products, the volume of the acoustic cavity is compressed. The foam sound absorbing piece is difficult to reduce Fo of the loudspeaker module to be low enough, and the middle and low frequency tone quality of the loudspeaker module cannot be guaranteed. In other schemes, porous non-foaming sound-absorbing materials (such as activated carbon, zeolite powder, activated silica, white carbon black, activated carbon, molecular sieves and MOFs or mixtures of the above materials prepared according to set types and proportions) are filled in the rear sound cavity. The property that the porous non-foaming material quickly adsorbs and desorbs gas is utilized, so that the resonant space of the rear acoustic cavity is virtually increased, and the resonant frequency Fo of the module is effectively reduced.

However, the speaker module uses multiple binders in the preparation process, because there are volatile organic solvents in some adhesives, the adhesives can produce organic small molecules in the curing process, in the bonding process, volatile organic solvents, organic small molecules and the like are easily adsorbed by the non-foaming sound-absorbing material, and the adsorption process is irreversible in the application environment. Volatile organic solvents, organic small molecules and the like can block the pore channels, so that the adsorption-desorption capacity of the non-foaming sound-absorbing material to gas is weakened or disappears, and the sound-absorbing performance is reduced.

Therefore, a new technical solution is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a new technical scheme of sound generating mechanism.

According to the utility model discloses an aspect provides a sound generating mechanism. This sound generating mechanism includes casing and sound production monomer, the inside of casing has the cavity, sound production monomer is set up in the cavity, sound production monomer's vocal portion will the cavity is separated for preceding sound chamber and back sound chamber the back sound intracavity intussuseption is filled with sound absorbing material, sound absorbing material includes that the non-foaming inhales sound granule and directional adsorption particle, directional adsorption particle is configured to be arranged in adsorbing the volatile organic compound in the application environment.

Optionally, the non-foamed sound absorbing particles and the directional adsorbent particles are mixed together.

Optionally, the sound absorption layer is formed by non-foaming sound absorption particles and the adsorption layer is formed by the directional adsorption particles, and the sound absorption layer and the adsorption layer are arranged alternately.

Optionally, the rear sound cavity is opposite to a side wall of the sound generating unit, and the sound absorbing layer and the absorbing layer are alternately arranged perpendicular to the vibration direction.

Optionally, the rear acoustic cavity includes a first region in which the non-foamed sound-absorbing particles are disposed and a second region in which the directional adsorption particles are disposed.

Optionally, the first area and the second area are communicated with each other, and the second area is located between the first area and the sounding unit.

Optionally, at least one of the non-foamed sound absorbing particles and the directional absorbing particles form a block structure that matches the structure of at least part of the rear acoustic cavity.

Optionally, the interior of the block structure forms a through channel.

Optionally, the crystallinity of the non-foamed sound-absorbing particles is greater than or equal to 75%.

Optionally, the degree of crystallinity of the directionally adsorbed particles is less than 75% and ≧ 5%.

According to one embodiment of the present disclosure, a sound absorbing material includes non-foamed sound absorbing particles and directional absorbing particles. The directional adsorption particles can effectively adsorb Volatile Organic Compounds (VOCs), so that the concentration of the VOCs in the rear acoustic cavity is effectively reduced. Like this, can hinder non-foaming to inhale sound granule absorption organic solvent, organic micro molecule etc. guarantee non-foaming and inhale quick absorption, the desorption performance of sound granule, reduced sound generating mechanism's Fo for sound generating mechanism's well, low frequency performance promote effectively.

The oriented adsorbent particles are effective to prevent irreversible aging failure of the non-foamed acoustical particles during use.

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

Drawings

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

Fig. 1-3 are schematic diagrams of a method of making a sound absorbing material according to one embodiment of the present disclosure.

Fig. 4-5 are schematic diagrams of a sound emitting device according to embodiments of the present disclosure.

Description of reference numerals:

11: a housing; 12: a sounding monomer; 13: a side wall; 15: a first region; 16: a second region.

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: unless specifically stated otherwise, 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.

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 disclosure, a sound generating device is provided. As shown in fig. 3 to 4, the sound generating device includes a housing 11 and a sound generating unit 12. The interior of the housing 11 has a cavity. The sound emitting unit 12 is disposed in the cavity. The sound generating unit 12 may be, but is not limited to, a moving coil unit, a capacitive unit, a piezoelectric unit, an electromagnetic unit, an ionic unit, or a pneumatic unit.

For example, in the moving-coil-type single body, the sounding single body 12 includes a magnetic circuit system and a vibration system. The vibration system includes a sound generating portion and a converting portion. The sound generating part is used for generating sound by vibration. The conversion part is used for converting electric energy into kinetic energy. The sound-producing part is a moving-iron type single diaphragm, a moving-coil type single vibrating diaphragm and the like. The conversion part is a coil, an armature and the like. When the magnetic circuit works, the coil responds to the electric signal of the external circuit to be stressed in the magnetic field of the magnetic circuit system to move, and drives the sound-generating part to vibrate. The vibrating portion vibrates the gas, thereby radiating sound outward.

The sound generating part of the sound generating unit 12 divides the cavity into a front sound cavity and a rear sound cavity. For example, the back acoustic cavity is close to the magnetic circuit system. The front sound chamber communicates with the outside through a sound outlet provided in the housing 11. The acoustic signal is radiated from the sound outlet hole to the external space. And the sound absorption material is filled in the rear sound cavity. The sound absorbing material includes non-foamed sound absorbing particles and directional absorbing particles. The directional adsorbent particles are configured for adsorbing volatile organic compounds in an application environment. Volatile Organic Compounds (VOCs) are organic compounds that can plug the pores of the non-foamed sound absorbing particles. For example, organic solvents, small organic molecules, or other organic molecules of the binder, etc. The application environment refers to a rear sound cavity of the sound generating device.

The non-foaming sound-absorbing material is of a porous structure, and the pore channels inside the non-foaming sound-absorbing material are communicated with the outside. The vibrating gas can rapidly enter and exit the pore channel. The porous structure of the non-foaming sound absorption material is formed by bonding atoms during the preparation process of the material and is not formed by a foaming process like foaming type foam cotton. Compared with foaming foam, the proportion of the through holes in the pore structure formed by the non-foaming sound-absorbing material is much larger, so that more vibration gas can be adsorbed, and the sound-absorbing effect is better.

For example, the crystallinity of the non-foamed sound-absorbing particles is 75% or more. Crystallinity refers to the degree of crystallinity of a material. The higher the crystallinity of the non-foamed sound-absorbing particles, the fewer the defects and the better the gas adsorption capacity. In this range of crystallinity, the non-foamed sound-absorbing particles have good adsorption capacity.

For example, the non-foamed sound absorbing material includes at least one of zeolite powder, activated silica, white carbon, activated carbon, molecular sieves, and MOFs (metal organic framework compounds). Wherein the zeolite powder is natural zeolite powder or artificial zeolite powder. The materials are all porous structures, so that the virtual volume of the rear sound cavity can be effectively improved, and the effect of virtual expansion is achieved. The above-mentioned material means a material having a crystallinity of 75% or more, and not all the materials satisfy the condition.

The non-foamed sound absorbing material is usually a powder. The size of the powder is usually 100 μm or less. The flowability of the powder is poor. The non-foamed sound-absorbing particles are obtained by preparing a powder raw material into particles (for example, main zeolite particles). The size of the particles is usually larger than 100 μm, the fluidity of the particles is better than that of the powder, and gaps for the passage of the vibrating gas can be formed between the particles.

For example, as shown in fig. 1, the non-foamed sound-absorbing particles may be prepared by extrusion, spray granulation, boiling granulation, disc-rolling, oil column molding, oil ammonia column molding, or the like. The above preparation methods can form spherical or approximately spherical particles. In the preparation process, the shape of the particles is affected by various factors in processing, and there is a possibility that an ideal spherical structure cannot be formed, and thus there are approximately spherical particles.

For example, the crystallinity of the directionally adsorbed particles is < 75% and ≧ 5%. The more defects the material has, the higher the activity and the better the adsorption effect on VOCs. Lower crystallinity indicates more defects in the material. The crystallinity is less than 75 percent and more than or equal to 5 percent, and the directional adsorption particles have good adsorption performance on VOCs.

For example, the directional adsorption particles include various activated carbons and metal, metalloid oxide species and the like starting from carbonaceous materials. E.g., directionally adsorbed particulate silica gel, zeolite powder, activated silica, alumina, molecular sieves, natural clays, MOFs, etc.). The above-mentioned material means a material having a crystallinity of < 75% and 5% or more, and not all the materials satisfy the condition.

It should be noted that, due to the influence of many factors such as microscopic physical pore structure (for example, pore size, distribution, etc.), chemical components, surface polarity, etc., the non-foamed sound-absorbing particles and the directional absorbing particles exhibit affinity and adsorption capacity with obvious difference for adsorbates, i.e., various Volatile Organic Compounds (VOCs) in the application environment.

In one example, the non-foamed sound absorbing particles have an average pore size of 0.3nm to 0.9 nm. Within this range, the non-foamed sound-absorbing particles have a good adsorption effect on the vibration gas.

In one example, the non-foamed sound absorbing particles have an average pore size of 0.4nm to 0.7 nm. Within this range, the non-foamed sound-absorbing particles have a better adsorption effect on the vibration gas.

In one example, the mean micropore pore size of the directionally adsorbed particles is greater than 0.9 nm. Within the particle size range, the directional adsorption particles have good directional adsorption effect on VOCs.

In embodiments of the present disclosure, the sound absorbing material includes non-foamed sound absorbing particles and directional absorbing particles. The directional adsorption particles can effectively adsorb Volatile Organic Compounds (VOCs), so that the concentration of the VOCs in the rear acoustic cavity is effectively reduced. Like this, can hinder non-foaming to inhale sound granule absorption organic solvent, organic micro molecule etc. guarantee non-foaming and inhale quick absorption, the desorption performance of sound granule, reduced sound generating mechanism's Fo for sound generating mechanism's well, low frequency performance promote effectively.

In addition, the directional adsorption particles are of a porous structure, and can play a role in virtual expansion.

In one example, the non-foamed sound absorbing particles and the directional adsorbent particles are mixed together.

For example, first, the non-foamed sound-absorbing particles and the directional absorbing particles are mixed together in a set mass ratio, particle diameter, and the like; then, packaging the mixed sound-absorbing material by adopting a PP tray and/or non-woven fabric; and finally, filling the packaged sound absorption material into the rear sound cavity.

Or the mixed sound absorption material can be directly filled into the rear sound cavity.

The non-foamed sound-absorbing particles and the directional absorbing particles can be filled into the rear sound cavity according to the set mass ratio, the set particle diameter and the like. During use, the two particles are gradually mixed together.

The technical personnel in the field can adjust the parameters such as the granularity, the mass ratio and the like of the non-foaming sound-absorbing particles and the directional adsorption particles according to the volume and the structure of the rear sound cavity, the type of the sound-emitting single body 12, the requirement of sound effect and the like.

In one example, as shown in fig. 3, the sound generating device includes a sound absorbing layer formed of non-foamed sound absorbing particles and an adsorption layer formed of directional adsorption particles. The sound absorbing layers and the absorbing layers are alternately arranged.

For example, the non-foamed sound-absorbing particles are bonded together by a binder to form a sound-absorbing layer; the oriented adsorbent particles are bonded together to form an adsorbent layer. Then, the sound absorbing layers and the absorbing layers are alternately laminated in the rear sound chamber.

Alternatively, a film layer is provided, and non-foamed sound-absorbing particles are bonded to one surface of the film layer to form a sound-absorbing layer; and bonding the oriented adsorbent particles to the other surface of the membrane layer to form an adsorbent layer. The structure is a composite layer of a sound absorption layer and an adsorption layer. In use, a plurality of composite layers are laminated together in the same orientation in the rear acoustic chamber, for example, with the adsorbent layer of each composite layer being below the upper sound-absorbing layer.

Preferably, the film layer is provided with a through hole. Like this, vibrating gas can pass the rete, and this makes the mass transfer effect better, and vibrating gas advances, goes out sound absorbing material more rapidly, and sound absorbing effect is better.

In one example, the rear acoustic cavity is opposite the side wall 13 of the sound emitting cell 12. The sound absorbing layers and the absorbing layers are alternately arranged perpendicular to the vibration direction. For example, the cavity is a flat structure. The sounding unit 12 is placed in the cavity in the thickness direction. The side wall 13 of the sound emitting unit 12 is opposite to the rear sound cavity. The vibrating airflow enters and exits the rear acoustic chamber from the side wall 13. The sides of the sound absorbing material form channels between the layers. The vibrating gas flows in a direction perpendicular or substantially perpendicular to the side wall 13, substantially in line with the direction of the channel.

The arrangement mode enables the vibrating gas to enter and exit the channel more smoothly, so that the mass transfer efficiency is higher, and the sound absorption effect of the sound absorption material is better.

In one example, the rear acoustic chamber includes a first region 15 and a second region 16. Non-foamed sound-absorbing particles are provided in the first region 15. Within the second region 16 are disposed directionally adsorbed particles. For example, the first region 15 and the second region 16 are disposed in series (as shown in fig. 4) or in parallel (as shown in fig. 5) in the flow direction of the vibrating gas. In this example, the non-foamed sound-absorbing particles and the directional absorbing particles are located in different regions, respectively, and mutual interference of the two materials can be effectively avoided.

In one example, as shown in fig. 4, the first region 15 and the second region 16 communicate with each other. For example, the second region 16 is located between the first region 15 and the sound emitting cells 12; or the first area 15 is located between the second area 16 and the sounding unit; or the first region 16 and the second region 15 are juxtaposed with respect to the sounding unit 12. The arrangement mode can adsorb the volatile organic compound on the directional adsorption particles to the maximum extent, and the volatile organic compound is prevented from being adsorbed by the non-foaming sound absorption particles.

In one example, at least one of the non-foamed sound absorbing particles and the directional absorbing particles form a block structure. The bulk structure matches the structure of at least part of the rear acoustic cavity. In use, the mass structure is filled into the rear acoustic cavity. The block-shaped structure is arranged in such a way that the filling of the sound-absorbing material in the rear sound cavity is facilitated.

For example, two kinds of particles are prepared separately into a block-like structure. The structure of the two block structures after being combined is matched with the structure of the rear sound cavity. When assembled, the two block structures are directly filled into the rear acoustic cavity.

Alternatively, the two particles may be mixed and then prepared into a block-like structure. The block structure is matched with the structure of the rear sound cavity. When assembled, the mass structure is filled directly into the rear acoustic cavity.

Preferably, the interior of the block-like structure forms a through-channel. The through channel and the clearance between the particles jointly form a channel for the inlet and the outlet of the vibrating gas. This makes the mass transfer effect of the vibrating gas more excellent.

In one example, the non-foamed sound absorbing particles and/or the oriented adsorbent particles are bonded to the three-dimensional network skeleton by a binder; then the block structure is formed through the steps of drying, roasting and the like. The through channels are formed by setting the size of the mesh of the three-dimensional network skeleton. The three-dimensional network framework enables the structural strength of the block structure to be high, and the size controllability of the through channel to be high.

Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the 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 (4)

1. The utility model provides a sound generating mechanism, wherein, includes casing and sound production monomer, the inside of casing has the cavity, sound production monomer is set up in the cavity, sound production monomer's sound production portion will the cavity is separated for preceding sound chamber and back sound chamber the back sound intracavity is filled with sound absorbing material, sound absorbing material includes the adsorbed layer that is formed by the non-foaming sound absorption particle and is formed by directional adsorption particle, sound absorbing layer with the adsorbed layer sets up in turn.

2. The sound generating apparatus according to claim 1, wherein the rear sound chamber is opposed to a side wall of the sound generating unit, and the sound absorbing layer and the absorbing layer are alternately arranged perpendicularly to a vibration direction.

3. The sound generating apparatus according to claim 1, wherein the sound absorbing layer and/or the absorbent layer form a block structure matching the structure of at least part of the rear sound cavity.

4. The sound generating apparatus of claim 3, wherein the interior of the block-like structure forms a through channel.

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