CN112423203A - Acoustic device and electronic apparatus - Google Patents
Acoustic device and electronic apparatus Download PDFInfo
- Publication number
- CN112423203A CN112423203A CN201910770933.1A CN201910770933A CN112423203A CN 112423203 A CN112423203 A CN 112423203A CN 201910770933 A CN201910770933 A CN 201910770933A CN 112423203 A CN112423203 A CN 112423203A
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- acoustic device
- flexible deformation
- closed cavity
- mounting groove
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Abstract
The invention discloses an acoustic device, comprising: the sound production unit, sound production unit's vibrating diaphragm rear side forms first airtight chamber, the cavity wall in first airtight chamber is sunken to form the mounting groove to the orientation in first airtight chamber, the mounting hole has been seted up on the tank bottom of mounting groove, the tank bottom is the acute angle with the notch place plane of mounting groove, the tank bottom is equipped with the flexible deformation subassembly that covers the mounting hole, flexible deformation subassembly is including combining flexible deformation portion and protector together, protector includes the fixed part, bottom and lateral part, fixed part and bottom are located different planes, fixed part and bottom are passed through the lateral part and are connected, the fixed part is connected fixedly with flexible deformation portion, flexible deformation portion connection fixation in tank bottom, be equipped with the intercommunicating pore on the bottom. The outer side of the first closed cavity is provided with a second closed cavity, and the flexible deformation assembly is located between the first closed cavity and the second closed cavity. The flexible deformation assembly of the acoustic device is of an integrated structure, so that the assembly procedures are effectively reduced, and the yield is improved.
Description
Technical Field
The present invention relates to the field of acoustic technologies, and in particular, to an acoustic device and an electronic apparatus having the acoustic device.
Background
The acoustic system of traditional structure includes the closed box and sets up the sound production unit on the closed box, forms the cavity between closed box and the sound production unit, because the volume of present terminal electronic product is done more and more littlely, along with terminal electronic product volume reduces, the thickness attenuate, with it the volume of complex acoustic device also littleer and more, but the consumer requires more and more to the performance of product, especially requires more and more to the bass effect of sound. For small volume acoustic devices, the volume of the volume is limited, as is the volume of the chamber in the acoustic system, which makes it difficult to achieve satisfactory bass reproduction.
At present, a flexible membrane is arranged on a shell of an acoustic system, and the flexible membrane is easily contacted with other components in the using or assembling process to damage the flexible membrane, so that the product performance is influenced.
Disclosure of Invention
The invention mainly aims to provide an acoustic device and electronic equipment, and aims to solve the technical problem that a flexible deformation part of the acoustic device is easy to damage in the using or assembling process.
To achieve the above and other objects, the present invention provides an acoustic device including:
the sound production unit comprises a vibrating diaphragm, a sound outlet is formed in the acoustic device, and sound waves on the front side of the vibrating diaphragm radiate outwards through the sound outlet; the rear side of the vibrating diaphragm forms a first closed cavity, the cavity wall of the first closed cavity is a first shell, the first shell is sunken to form a mounting groove in the direction of the first closed cavity, a mounting hole is formed in the bottom of the mounting groove, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible deformation component is located between the first closed cavity and the second closed cavity, and the second closed cavity seals the sound wave generated by the flexible deformation part during deformation in the second closed cavity; the tank bottom with the notch place plane of mounting groove is the acute angle, the tank bottom is equipped with the cover the flexible deformation subassembly of mounting hole, flexible deformation subassembly is including combining flexible deformation portion and protector together, protector includes fixed part, bottom and lateral part, the lateral part is located the periphery of bottom, the lateral part along axial one end with the bottom combines fixedly, the fixed part is located the lateral part is along the external periphery of axial other end, the bottom with the lateral part forms the correspondence the cover body of flexible deformation portion passes through the fixed part install in first casing, be equipped with the intercommunicating pore on the bottom.
Optionally, an exhaust duct communicating the inside of the mounting groove with the second sealed cavity is arranged on the side wall of the mounting groove.
Optionally, the side wall of the mounting groove is recessed towards a direction away from the flexible deformation component to form a glue injection groove.
Optionally, the flexible deformation component does not exceed the plane of the notch of the mounting groove.
Optionally, the flexible deformation assembly is located in a space formed by the dust screen and the first shell in a surrounding mode.
Optionally, the dust screen is a mesh.
Optionally, the guard is a steel mesh.
Optionally, the volume of the second closed cavity is larger than the volume of the first closed cavity; at least a portion of an enclosure of an electronic device for mounting an acoustic device is used to form the first enclosed cavity and/or the second enclosed cavity.
Optionally, the first casing includes an upper casing and a lower casing, the magnetic circuit system of the sound generating unit includes a magnetic yoke, the mounting hole is provided in the upper casing, the flexible deformation component is mounted in the mounting hole, the lower casing is provided with an opening, and the magnetic yoke is embedded in the opening.
To achieve the above and other objects, the present invention provides an electronic apparatus including a housing of the electronic apparatus and the above-described acoustic device.
The acoustic device has the technical effects that at least, the cavity wall of the first closed cavity of the acoustic device is sunken towards the direction of the first closed cavity to form a mounting groove, a mounting hole is formed in the groove bottom of the mounting groove, an acute angle is formed between the groove bottom and the plane of the notch of the mounting groove, a flexible deformation component covering the mounting hole is arranged at the groove bottom, the flexible deformation component comprises a flexible deformation part and a protection device which are combined together, the protection device comprises a fixing part, a bottom part, a side part connected with the fixing part and the bottom part, the side part is arranged on the periphery of the bottom part, one end of the side part along the axial direction is combined and fixed with the bottom part, the fixing part is arranged on the periphery of the other end of the side part along the axial direction, the bottom part. Therefore, the flexible deformation part is covered with the protection device to protect the flexible deformation part from being damaged and destroyed.
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 cross-sectional view of one embodiment of an acoustic device of the present invention
FIG. 2 is an exploded view of another embodiment of an acoustic apparatus of the present invention;
FIG. 3 is a top view of another embodiment of the acoustic device of the present invention with the dust screen removed;
FIG. 4 is a cross-sectional view of another embodiment of an acoustic device of the present invention;
FIG. 5 is a schematic view of an assembly structure of an upper shell and a flexible deformable member in another embodiment of an acoustic device according to the present invention;
FIG. 6 is a schematic view of an assembled structure of an upper case and a guard in another embodiment of an acoustic device according to the present invention;
fig. 7 is a schematic view showing an assembly structure of a lower case and a sound generating unit in another embodiment of the acoustic device according to the present invention;
FIG. 8 is a schematic structural view of a steel mesh in an embodiment of the acoustic device of the present invention;
FIG. 9 is a schematic diagram of the structure of a diaphragm in an embodiment of an acoustic device of the present invention;
FIG. 10 is a cross-sectional view of a flexible deformable member in an embodiment of an acoustic device of the invention;
the reference numbers illustrate:
1 is flexible deformation subassembly, 11 is the steel mesh, 111 is the bottom, 112 is the lateral part, 113 is the fixed part, 114 is the intercommunicating pore, 12 is the vibrating diaphragm, 121 is the joint portion, 122 is the book ring, 123 is the central part, 124 is the reinforcement portion, 2 is first casing, 21 is the epitheca, 211 is the mounting hole, 212 is the phonate hole, 214 is the mounting groove, 215 is the injecting glue groove, 216 is the exhaust duct, 22 is the inferior valve, 221 is the opening, 23 is the pressure-equalizing hole, 3 is the sound generating unit, 31 is the magnetic yoke, 4 is FPC, 5 is the second casing, 6 is first airtight chamber, 7 is second airtight chamber.
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 an acoustic device which is used for sounding on electronic equipment.
The acoustic device comprises a sound generating unit 3, as shown in fig. 1-3, wherein the sound generating unit 3 is a miniature sound generating unit 3, and more specifically, the sound generating unit 3 is a miniature moving coil speaker. The sound production unit 3 generally comprises a shell, a vibration system and a magnetic circuit system, wherein the vibration system and the magnetic circuit system are accommodated and fixed in the shell, the vibration system comprises a vibration diaphragm fixed on the shell and a voice coil combined on the vibration diaphragm, a magnetic gap is formed in the magnetic circuit system, the voice coil is arranged in the magnetic gap, and the voice coil reciprocates up and down in a magnetic field after alternating current is introduced into the voice coil, so that the vibration diaphragm is driven to vibrate and produce sound.
The acoustic device comprises a first shell 2, wherein the first shell 2 is divided into an upper shell 21 and a lower shell 22, the upper shell 21 and the lower shell 22 enclose to form a containing cavity, a sound generating unit 3 is arranged in the containing cavity, and the sound generating unit 3 is in circuit conduction with an external circuit through an FPC 4. The acoustic device is provided with a sound outlet 212, in one embodiment, the upper shell 21 is provided with the sound outlet 212, sound waves on the front side of the diaphragm are radiated to the outside through the sound outlet 212, and sound waves on the rear side of the diaphragm are left inside the acoustic device. A cavity is formed between the diaphragm and the housing and the magnetic circuit system, a rear sound hole is generally formed in the housing or the magnetic circuit system or between the housing and the magnetic circuit system, sound waves at the rear side of the diaphragm can enter the interior of the acoustic device through the rear sound hole, and preferably, the rear sound hole is formed in four corners of the sound generating unit 3. The vibration direction of the vibration diaphragm of the sound production unit 3 of the present invention is parallel to the thickness direction of the acoustic device, which is advantageous for the thin design of the acoustic device.
In the present embodiment, as shown in fig. 7, an opening 221 is formed in the lower shell 22 of the acoustic device at a position corresponding to the sound generating unit 3, the shape and size of the opening 221 are matched with those of the sound generating unit 3, the magnetic circuit system of the sound generating unit 3 includes a magnetic conductive yoke 31, and the magnetic conductive body is embedded in the opening 221, which indicates that the magnetic conductive yoke 31 is exposed out of the acoustic device.
Further, a first closed cavity 6 is formed at the rear side of the vibrating diaphragm, a mounting hole 211 is formed in the cavity wall of the first closed cavity 6, and the shape of the mounting hole 211 may be a circle, a rectangle, a square, an ellipse, a diamond or an irregular figure. The chamber wall of the first closed chamber 6 is the first shell 2.
In the present invention, as shown in fig. 4, the first housing 2 is recessed toward the first sealed cavity 6 to form a mounting groove 214, a mounting hole 211 is formed on the bottom of the mounting groove 214, an acute angle is formed between the bottom of the mounting groove and a plane where the notch of the mounting groove 214 is located, a flexible deformation component 1 covering the mounting hole 211 is arranged at the bottom of the mounting groove 214, and the shape of the flexible deformation component 1 is adapted to the shape of the mounting hole 211. And a second closed cavity 7 is arranged on the outer side of the first closed cavity 6, and the flexible deformation component 1 is positioned between the first closed cavity 6 and the second closed cavity 7. The groove bottom and the plane of the notch of the mounting groove 214 form an acute angle, so that the flexible deformation component 1 mounted on the groove bottom of the mounting groove 214 also forms an acute angle with the plane of the notch of the mounting groove 214 as a whole, that is, one end of the flexible deformation component 1 has a height difference in the vertical direction compared with the other end, and one end is farther from the notch of the mounting groove 214 than the other end, even if a component of the electronic device is abutted to the first housing 2 or the flexible deformation component 1, a gap is left between the end of the flexible deformation component 1 farther from the notch of the mounting groove 214 and the component of the electronic device. The size of the acute angle formed by the groove bottom and the plane of the notch of the mounting groove 214 is not limited, and can be set according to actual requirements. Further, the flexible deformation component 1 does not exceed the plane of the notch of the mounting groove 214, so that the probability of contact and even scratch of external parts and the flexible deformation component 1 is effectively reduced.
As shown in fig. 8-10, the flexible deformation assembly 1 includes a flexible deformation portion and a protection device which are combined together, preferably, the flexible deformation portion and the protection device are combined by adhesive fixation, and the flexible deformation portion and the protection device are combined into a whole by adhesion, so as to facilitate the next assembly. The protective device is made of hard materials, can be metal, plastics and the like, and preferably, the protective device is a steel mesh 11, and the overall thickness can be reduced based on the design of the steel mesh 11, so that the thickness of the acoustic device can be reduced. The steel net 11 will be described as an example.
In one embodiment, the flexible deformation portion is a diaphragm 12, the diaphragm 12 includes a connecting portion 121, a folded ring 122, a central portion 123 and a reinforcing portion 124, the connecting portion 121 is used to fix the diaphragm 12, the connecting portion 121 is sandwiched between the bottom of the mounting groove 214 and the fixing portion 113, the central portion 123 is elastically suspended from the connecting portion 121 through the folded ring 122, and the reinforcing portion 124 is disposed on the central portion 123 for the structural strength of the central portion 123. In this embodiment, the reinforcing portion 124 is disposed on a side of the central portion 123 away from the bottom portion 111, so as to avoid occupying a space between the flexible deformation portion and the steel mesh 11, thereby ensuring a vibration space of the flexible deformation portion. The corrugated rim 122 is protruded toward the steel net 11 to reduce the thickness of the flexible transforming assembly 1. The central portion 123 may be of an integral structure or the central portion 123 may be hollow, and the strength of the reinforcing portion 124 may be higher than that of the central portion 123, and may be metal, plastic, carbon fiber, or a composite structure thereof. The diaphragm 12 is described below as an example.
When the acoustic device is in a working state, when the vibrating diaphragm vibrates towards the first closed cavity 6 to compress the volume at the rear side of the vibrating diaphragm, sound pressure is transmitted to the vibrating diaphragm 12 through the first closed cavity 6, and the vibrating diaphragm 12 expands and deforms towards the outer side of the first shell 2; on the contrary, when the vibrating diaphragm vibrates away from the first closed cavity 6, the vibrating diaphragm 12 contracts and deforms inwards, so that the volume of the first closed cavity 6 is adjusted. The diaphragm 12 may be a single-layer structure made of a thermoplastic elastomer material layer or a multi-layer composite structure formed by at least compounding one thermoplastic elastomer material layer, where the thermoplastic elastomer material includes at least one of polyesters, polyurethanes, polyamides, polystyrenes, polyolefins, dynamic vulcanized rubbers, and blend type thermoplastics. Because the thermoplastic elastomer material has certain flexibility, deformation easily occurs when being influenced by vibration, so that the vibrating diaphragm 12 can adjust the first closed cavity 6. When the material of the diaphragm 12 is not limited to the above materials, it may also be some plastic, silica gel, rubber, etc. capable of realizing flexible deformation.
The steel mesh 11 can prevent that outside object from destroying, damaging vibrating diaphragm 12, and even when vibrating diaphragm 12 vibrates and deforms, the steel mesh 11 plays certain damping effect to the deformation of vibrating diaphragm 12, makes vibrating diaphragm 12 deform along with the acoustic pressure, when adjusting the compliance of first airtight chamber 6, can reduce the interference to the acoustic device complete machine, can reduce the interference to the applied electronic equipment complete machine of acoustic device even.
Specifically, steel mesh 11 sets up in the one side that deviates from first airtight chamber 6 of vibrating diaphragm 12, covers mounting hole 211, and when there is certain distance in order to guarantee vibrating diaphragm 12 deformation space bottom 111 of steel mesh 11 and vibrating diaphragm 12, still play protection and dustproof effect to vibrating diaphragm 12 to and certain damping.
When the vibrating diaphragm vibrates, the sound pressure inside the first closed cavity 6 changes, the vibrating diaphragm 12 deforms along with the sound pressure change of the first closed cavity 6, and the flexible adjustment of the volume of the first closed cavity 6 is carried out; the second closed cavity 7 encloses the sound waves generated by the diaphragm 12 during deformation in the second closed cavity 7.
Preferably, at least a part of the housing of the electronic equipment for mounting the acoustic device is used to form the first closed chamber 6 and/or the second closed chamber 7. The electronic device can be a mobile phone, a tablet computer, a notebook computer and the like. That is, a part or the whole of the first casing 2 is formed by the housing of the electronic device, a part or the whole of the chamber wall of the second sealed chamber 7 is formed by the housing of the electronic device, or a part or the whole of the chamber walls of the first sealed chamber 6 and the second sealed chamber 7 is formed by the housing of the electronic device. In the invention, the shell of the electronic equipment is also used as the cavity wall of the first closed cavity 6 and/or the second closed cavity 7, so that the internal space of the electronic equipment can be fully utilized, and meanwhile, the space occupied by a part of the cavity wall is saved, thereby being more beneficial to the thinning design of the electronic equipment. The cavity wall of the second closed cavity 7 is the second shell 5.
It should be noted that the "sealing" described in this embodiment and the present invention may be a fully sealed physical structure, or may be a relatively sealed state, for example, the first sealed cavity 6 may include a structure that is set up to balance the internal and external air pressures and to rapidly change the sound pressure based on the use requirement of the productPressure equalizing holes 23, or other open cell structures, which have no significant effect, are also considered to be closed chambers. Also for example, the second closed chamber 7 may include a gap or the like generated when combined with the first closed chamber 6, and a gap or the like of its own structure, which can effectively isolate the sound wave generated by the diaphragm 12, have no significant influence on the sound wave generated by the sound generating unit, and are also regarded as closed chambers. Typically, the total area of the openings or slits does not exceed 20mm2。
Specifically, the bottom 111 is provided with communication holes 114 for equalizing air pressures inside and outside the bottom 111, and the number of the communication holes 114 is not limited and can be set according to actual requirements. The vibrating diaphragm 12 produces deformation so that the airtight chamber 7 interior atmospheric pressure sound production changes, and the tank bottom of mounting groove 214 is the acute angle with the notch place plane of mounting groove 214, and when electronic equipment's part butt touched first casing 2 or flexible deformation subassembly 1 on, there was the space between flexible deformation subassembly 1 and electronic equipment's the part, can balance the atmospheric pressure in mounting groove 214 inner space and the airtight chamber 7 of second.
In one embodiment, the upper shell 21 is provided with a mounting groove 214, the mounting groove 214 is formed by the upper shell 21 being recessed towards the first sealed cavity 6, the shape of the mounting groove 214 is matched with the shape of the flexible deformation assembly 1, and the flexible deformation assembly 1 is mounted in the mounting groove 214 to cover the mounting hole 211. The first shell 2 of the acoustic device is provided with the mounting groove 214, so that the space of the acoustic device occupied by the flexible deformation assembly 1 can be effectively reduced, the thickness of the acoustic device is reduced, and the volume of the second closed cavity 7 can not be occupied. The side wall of the mounting groove 214 is perpendicular to the plane of the diaphragm 12, and the gap between the side part 112 and the side wall of the mounting groove 214 is small, thereby effectively ensuring the volume of the first sealed cavity 6.
Or the side wall of the mounting groove 214 and the plane where the diaphragm 12 is located form a certain inclination angle, and the area of the opening of the mounting groove 214 is larger than the area of the bottom of the mounting groove 214, so that glue can be injected between the side part 112 and the side wall of the mounting groove 214.
Preferably, as shown in fig. 5, the side wall of the mounting groove 214 is perpendicular to the plane where the diaphragm 12 is located, and the side wall of the mounting groove 214 is recessed towards the direction away from the flexible deformation assembly 1 to form a glue injection groove 215, so that glue injection is facilitated and the fixed area is increased under the condition that the volume of the first sealed cavity 6 is ensured. In one embodiment, the flexible deformation member 1 is rectangular in top view, and the glue injection grooves 215 are disposed on two opposite sides of the flexible deformation member 1.
In one embodiment, the side wall of the mounting groove 214 is provided with an exhaust groove 216 communicating the first airtight chamber 6 and the second airtight chamber 7. Due to the design, sound waves generated by vibration of the diaphragm 12 can be transmitted into the second closed cavity 7 through the exhaust groove 216, and the problem that the sensitivity of a low-frequency band is reduced in amplitude or fails due to the fact that one side, facing the second closed cavity 7, of the diaphragm 12 is blocked by other parts in the second closed cavity 7 during assembly can be avoided. Even if the notch of the mounting groove 214 is completely blocked by other parts, the air discharge groove 216 can realize the communication of the air flow of the second closed cavity 7 and the gap between one end of the flexible deformation assembly 1, which is far away from the notch of the mounting groove 214, and the other parts.
As shown in fig. 2, 4 and 6, the acoustic device of the present invention further includes a dust screen 8, the dust screen 8 covers the installation groove 214, and the flexible deformation component 1 is located in a space enclosed by the dust screen 8 and the first housing 2. Due to the arrangement of the dustproof net 8, external dust can be effectively prevented from entering the first closed cavity 6, the product performance is further influenced, the product appearance can be improved, and the product has higher integrity. Preferably, the dust screen 8 is a mesh cloth, and is simple in structure and convenient to install.
As a specific embodiment, the acoustic device includes first casing 2, and sound generating unit 3 installs and forms sound generating component on first casing 2, forms first airtight chamber 6 between sound generating unit 1's the vibrating diaphragm and first casing 2, has seted up mounting hole 211 on first casing 2 be equipped with vibrating diaphragm 12 on the mounting hole 211, mounting hole 211 and vibrating diaphragm 12 are not limited to a set of, can set up the multiunit in the different positions of first casing 2. The acoustic device comprises a second shell 5, the sound generating component is arranged in the second shell 5, and a second closed cavity 7 is formed between the second shell 5 and the first shell 2. However, when other components are present in the second casing 5, the second sealed chamber 7 is actually formed by the components and the gap between the second casing 5 and the first casing 2.
In this embodiment, the sound generating unit 3 is disposed inside the first casing 2, and both are formed as an integral structure, and then assembled with the second casing 5. The first casing 2 is provided with a through hole with which the space on the front side of the diaphragm communicates, through which sound is radiated to the sound outlet hole 212 of the acoustic device.
The acoustic device is mounted in an electronic apparatus such as a mobile phone, and a housing of the electronic apparatus also serves as the second casing 5 of the acoustic device. The space between the shell of the electronic equipment and the internal parts and the space between the shell of the electronic equipment and the first shell 2 of the acoustic device form a second closed cavity 7, the second shell 5 of the acoustic device is omitted, the gap space between the shell parts of the electronic equipment is fully utilized, and the maximum design of the second closed cavity 7 can be realized.
In the present embodiment, the main bodies of the first closed chamber 6 and the second closed chamber 7 extend in the horizontal direction formed by the length and width of the acoustic device, and the horizontal direction may be defined as a direction perpendicular to the thickness direction of the acoustic device. The horizontal direction generally refers to the direction parallel to the horizontal plane when the acoustic device is placed on the horizontal plane, and the two chambers are arranged along the horizontal direction, so that the space in the height direction of the acoustic device is not occupied as much as possible, and the thinning design of a product is facilitated.
In the acoustic device, the vibrating diaphragm 12 is arranged, the vibrating diaphragm 12 deforms along with sound pressure, and the volume of the first closed cavity 6 is adjustable, so that the equivalent acoustic compliance of the first closed cavity 6 is increased, the resonance frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved; the sound radiation that produces among the isolated vibrating diaphragm 12 deformation process through second airtight chamber 7 seals the radiation sound wave of vibrating diaphragm 12 inside acoustic device, avoids the antiphase radiation sound wave of vibrating diaphragm 12, causes the offset influence to the forward radiation sound wave of sound generating unit 3, and then the low frequency band sensitivity of great range promotion product on the whole.
Moreover, the volume of the second closed cavity is larger than that of the first closed cavity in the embodiment, so that the deformation of the diaphragm 12 is easier, the equivalent acoustic compliance of the first closed cavity is more favorably increased, the resonance frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved.
The invention provides an electronic device, wherein the acoustic device in the embodiment is installed on the electronic device, and the electronic device can be a mobile phone, a tablet computer, a notebook computer and the like.
The electronic device particularly comprises an outer casing of the electronic device, at least a part of which is used to form a first closed cavity and/or a second closed cavity of the acoustic device. That is, a part or the whole of the first casing 2 is formed by a housing of the electronic device, a part or the whole of the second casing 5 is formed by a housing of the electronic device, or a part or the whole of the first casing 2 and the second casing 5 is formed by a housing of the electronic device. In the invention, the shell of the electronic equipment is used as the first shell 2 and the second shell 5, so that the space in the electronic equipment can be fully utilized, and meanwhile, the space occupied by a part of cavity wall is saved, thereby being more beneficial to the thin design of the electronic equipment.
In this specific embodiment, the acoustic device includes first casing 2, sound generating unit 3 is installed on first casing 2 and is formed the sound production subassembly, form first airtight chamber between sound generating unit 3's the vibrating diaphragm and first casing 2, seted up mounting hole 211 on first casing 2, be equipped with vibrating diaphragm 12 on mounting hole 211, mounting hole 211 and vibrating diaphragm 12 are not limited to one set, can set up the multiunit in the different positions of first casing 2. The acoustic device further comprises a second shell, the sound production assembly is installed in the second shell, and a second closed cavity is formed between the second shell and the first shell 2. The second shell is a shell of the electronic equipment. In fact, the space between the electronic equipment shell and the internal parts and the space between the electronic equipment shell and the first shell 2 of the acoustic device form a second closed cavity, the electronic equipment shell is also used as the second shell of the acoustic device, the second shell of the acoustic device is omitted, the gap space between the electronic equipment shell parts is fully utilized, the maximum design of the second closed cavity can be realized, and the thin design of the electronic equipment is facilitated.
By adopting the structure and the assembling method, the flexible deformation component is integrally arranged on the first shell of the acoustic device, so that the assembling procedures can be effectively reduced, the defects caused by soft materials of the flexible deformation part are avoided, the efficiency and the yield are improved, and the automatic feeding is facilitated; the protective device of the flexible deformation assembly is basin-shaped and can provide partial vibration space for the flexible deformation part, so that the basin-shaped protective device and the flexible deformation part can be combined together, and compared with a flat steel mesh, the basin-shaped protective device occupies relatively small space in the length and width directions of the acoustic device, has high structural strength and is not easy to deform, and avoids poor performance caused by abnormal size due to part deformation; the groove bottom of the mounting groove and the plane where the notch of the mounting groove is located form an acute angle, so that the internal space of the mounting groove and the air pressure of the second sealed cavity can be balanced.
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 (10)
1. An acoustic device, comprising:
the sound production unit comprises a vibrating diaphragm, a sound outlet is formed in the acoustic device, and sound waves on the front side of the vibrating diaphragm radiate outwards through the sound outlet;
the rear side of the vibrating diaphragm forms a first closed cavity, the cavity wall of the first closed cavity is a first shell, the first shell is sunken to form a mounting groove in the direction of the first closed cavity, a mounting hole is formed in the bottom of the mounting groove, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible deformation component is located between the first closed cavity and the second closed cavity, and the second closed cavity seals the sound wave generated by the flexible deformation part during deformation in the second closed cavity;
the tank bottom with the notch place plane of mounting groove is the acute angle, the tank bottom is equipped with the cover the flexible deformation subassembly of mounting hole, flexible deformation subassembly is including combining flexible deformation portion and protector together, protector includes fixed part, bottom and lateral part, the lateral part is located the periphery of bottom, the lateral part along axial one end with the bottom combines fixedly, the fixed part is located the lateral part is along the external periphery of axial other end, the bottom with the lateral part forms the correspondence the cover body of flexible deformation portion passes through the fixed part install in first casing, be equipped with the intercommunicating pore on the bottom.
2. The acoustic device according to claim 1, wherein a vent groove communicating the inside of the installation groove and the second airtight chamber is provided on a side wall of the installation groove.
3. The acoustic device according to claim 1, wherein the side wall of the mounting groove is recessed away from the flexibly deformable component to form a glue injection groove.
4. The acoustic device according to claim 1, wherein the flexible deformable member does not extend beyond the plane of the notch of the mounting groove.
5. The acoustic device according to claim 4, further comprising a dust screen, wherein the dust screen is covered in the mounting groove, and the flexible deformation component is located in a space defined by the dust screen and the first housing.
6. The acoustic device of claim 5, wherein the dust screen is a mesh.
7. The acoustic device of claim 1, wherein the shield is a steel mesh.
8. The acoustic device according to claim 1, wherein the volume of the second closed chamber is greater than the volume of the first closed chamber;
at least a portion of an enclosure of an electronic device for mounting an acoustic device is used to form the first enclosed cavity and/or the second enclosed cavity.
9. The acoustic device according to claim 1, wherein the first casing includes an upper casing and a lower casing, the magnetic circuit system of the sound generating unit includes a magnetic yoke, the mounting hole is provided in the upper casing, the flexible deformation member is mounted in the mounting hole, the lower casing is provided with an opening, and the magnetic yoke is fitted in the opening.
10. An electronic device, characterized in that the electronic device comprises a housing of the electronic device and an acoustic apparatus according to claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910770933.1A CN112423203B (en) | 2019-08-20 | 2019-08-20 | Acoustic device and electronic apparatus |
| PCT/CN2019/126127 WO2021031476A1 (en) | 2019-08-20 | 2019-12-18 | Acoustic apparatus and electronic device |
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| CN201910770933.1A CN112423203B (en) | 2019-08-20 | 2019-08-20 | Acoustic device and electronic apparatus |
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| CN112423203B CN112423203B (en) | 2022-03-15 |
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| WO2021031476A1 (en) | 2021-02-25 |
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