CN110572755B - Acoustic device and electronic apparatus - Google Patents
Acoustic device and electronic apparatus Download PDFInfo
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- CN110572755B CN110572755B CN201910842936.1A CN201910842936A CN110572755B CN 110572755 B CN110572755 B CN 110572755B CN 201910842936 A CN201910842936 A CN 201910842936A CN 110572755 B CN110572755 B CN 110572755B
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- protective cover
- cover plate
- flexible deformation
- closed cavity
- acoustic device
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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
- H04R9/025—Magnetic circuit
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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
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
Abstract
The invention discloses an acoustic device, comprising: the sounding unit and the first closed cavity; a mounting hole is formed in the cavity wall of the first sealed cavity, a flexible deformation part is arranged on the mounting hole, and a second sealed cavity is arranged on the outer side of the first sealed cavity; the mounting hole is also provided with a protective cover plate positioned on the outer side of the flexible deformation part; the protective cover plate comprises a bottom wall and a fixing part; the bottom wall comprises a first surface and a second surface which are close to the second closed cavity, and a height difference is formed between the first surface and the second surface. The present invention also provides an electronic device, wherein: the electronic device comprises a housing of the electronic device and the acoustic apparatus as described above mounted within the housing. According to the invention, the first surface and the second surface with the height difference are arranged on the protective cover plate, so that the air flow generated by the flexible deformation part can be smoothly communicated with the second closed cavity, and the improvement of the low-frequency sensitivity of the acoustic device is ensured.
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
In general, an acoustic system of a conventional structure includes a closed casing and a sound generating unit provided on the closed casing, a chamber is formed between the closed casing and the sound generating unit, and it is difficult for the acoustic system, particularly a small acoustic system, to achieve an effect of satisfactorily reproducing bass sound due to a volume limit of the chamber in the acoustic system. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two measures are generally taken, one is to provide a sound absorbing material in a cabinet of the acoustic system for adsorbing or desorbing gas in the cabinet to have an effect of increasing a volume and thus lowering a low-frequency resonance frequency, and the other is to provide a passive radiator on the cabinet of the acoustic system.
However, the two methods have problems, the first scheme of adding the sound-absorbing material into the box body needs to realize good sealing and packaging of the sound-absorbing material, otherwise, if the sound-absorbing material enters the sound-generating unit, the acoustic performance of the sound-generating unit is damaged, and the service life of the sound-generating unit is influenced; the second scheme, which adopts a passive radiator, can only improve the sensitivity of the frequency band near the resonance point, but cannot improve all low frequency bands.
As an improvement, a new acoustic device is proposed, which includes a sound generating unit and a sound generating assembly formed of a first closed cavity. In order to promote low-frequency sensitivity, still install flexible deformation portion on the cavity wall of the first airtight chamber of sound generating component, after sound generating component and electronic equipment installation, flexible deformation portion is arranged in electronic equipment's cavity (hereinafter referred to as second airtight chamber), because flexible deformation portion produces deformation along with the acoustic pressure, the volume size in first airtight chamber is adjustable to increase first airtight chamber equivalent sound and smoothness, effectively reduce acoustic device resonant frequency, promote low-frequency sensitivity.
However, since the electronic device includes the circuit board and many components, the flexible deformation portion may be covered by the circuit board or the components during the assembly of the sound generating unit and the electronic device, and the airflow generated by the flexible deformation portion may not smoothly communicate with the second sealed cavity. Therefore, it is desirable to provide an acoustic device that prevents the airflow generated by the flexible deformation from being blocked, so as to solve the problem of reduced or failed low-frequency band sensitivity enhancement.
Disclosure of Invention
An object of the present invention is to provide an acoustic device, which can prevent an air flow generated by a flexible deformation portion of the acoustic device from being unable to smoothly communicate with a second airtight chamber, so as to improve low-frequency sensitivity of the acoustic device.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
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, a mounting hole is formed in the cavity wall of the first closed cavity, a flexible deformation part is arranged on the mounting hole, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible deformation part is located between the first closed cavity and the second closed cavity, and sound waves generated by the flexible deformation part during deformation are sealed in the second closed cavity by the second closed cavity; the mounting hole is also provided with a protective cover plate positioned on the outer side of the flexible deformation part, and the protective cover plate is provided with an air hole which penetrates through the protective cover plate and is communicated with the flexible deformation part and the second closed cavity; the protective cover plate comprises a bottom wall positioned in the middle and a fixing part positioned at the edge and fixedly combined with the cavity wall, wherein a sinking platform which is sunken towards the direction of the flexible deformation part is arranged on one side of the bottom wall close to the fixing part; the bottom wall comprises a first surface far away from the flexible deformation part and a second surface arranged on the sinking platform, and a height difference is formed between the first surface and the second surface.
Preferably, the second surface is disposed around the first surface, and the first surface is parallel to the second surface; an engagement surface for connecting two planes is arranged between the first surface and the second surface; the first surface and the second surface are both provided with the air holes.
Preferably, the flexible deformation part comprises a middle part located at the middle position and a folded ring part located at the edge position, the middle part is of a flat plate-shaped structure, and the folded ring part is of an arc-shaped structure; the folded ring part is protruded towards one side far away from the protective cover plate; the middle portion is arranged opposite to the first surface, and the folded ring portion is arranged opposite to the second surface.
Preferably, the intermediate portion is parallel to the first surface; the orthographic projection of the middle part to the first surface is positioned in the area of the first surface; the distance between the middle part and the first surface is larger than the maximum amplitude of the flexible deformation part.
Preferably, the shape of the intermediate portion is the same as the shape of the first surface, and the intermediate portion overlaps with an orthographic projection of the first surface,
preferably, the side of the border position of fixed part is equipped with the gluey groove of appearance of indent, hold gluey groove with form the clearance between the inside wall of mounting hole, it has the fixed to coat in the gluey groove the protection cover plate with the colloid of cavity wall.
Preferably, the cavity wall of the first closed cavity comprises a first shell, and the mounting hole is positioned on the first shell; the mounting hole comprises a groove formed by sinking, a through groove communicated with the groove and the second closed cavity is formed in the side wall of the first shell, and air flow generated by the flexible deformation part can pass through the through groove and the second closed cavity.
Preferably, the protective cover plate is provided with a plurality of air-permeable micropores, and the area of each air-permeable micropore is less than or equal to 0.2mm2。
Preferably, the thickness of the protective cover plate is less than or equal to 0.2mm, the breathable micropores are circular holes, and the pore diameter of the breathable micropores is less than or equal to 0.3 mm.
Preferably, the thickness of the protective cover plate is less than or equal to 0.2mm, and the ventilation micropores are oval.
Preferably, the protective cover plate is provided with a large air-permeable hole or a plurality of small air-permeable holes, and a shielding piece is further arranged, and the shielding piece covers the large air-permeable hole or the small air-permeable holes of the protective cover plate.
Preferably, the protective cover plate is made of one of a steel sheet, an FR-4 sheet, a PET sheet, a PEN sheet, a carbon fiber sheet and a ceramic sheet.
Preferably, at least a portion of a housing of the electronic device for mounting the acoustic device is used to form the first closed chamber and/or the second closed chamber.
The present invention also provides an electronic device, wherein: the electronic equipment comprises a shell of the electronic equipment and the acoustic device installed in the shell.
According to the invention, the first surface and the second surface with the height difference are arranged on the protective cover plate, so that the protective cover plate can not block all air holes on the protective cover plate even if the protective cover plate is covered by a circuit board or a part in the second closed cavity, the air flow generated by the flexible deformation part can be still ensured to be smoothly communicated with the second closed cavity, and the improvement of the low-frequency sensitivity of the acoustic device is ensured.
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 top view of a sound emitting assembly of an acoustic device provided by the present invention.
Fig. 2 is a sectional view a-a of the sound emitting assembly shown in fig. 1.
Fig. 3 is a schematic structural diagram of an acoustic device provided by the present invention.
Fig. 4 is an exploded perspective view of a sound emitting module in the acoustic device of the present invention.
Fig. 5 is an exploded perspective view of a protective cover and a flexible deformation portion of an acoustic device provided by the present invention.
Fig. 6 is a sectional view of the acoustic device according to the present invention after assembling the protective cover and the flexible deformation portion.
Fig. 7 is a schematic structural diagram of the acoustic device provided by the present invention after the protective cover plate is assembled with the cavity wall.
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.
Example (b):
as shown in fig. 1 to 4, an acoustic device includes a sound generating unit 1, where in this embodiment, the sound generating unit 1 is a miniature sound generating unit, and more specifically, the sound generating unit 1 is a miniature moving-coil speaker. The sound generating unit 1 generally includes a housing, a vibration system and a magnetic circuit system, the vibration system and the magnetic circuit system are accommodated and fixed in the housing, the vibration system includes a vibration diaphragm 11 (as shown in fig. 2 and 4) fixed on the housing and a voice coil combined on the vibration diaphragm 11, 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 as to drive the vibration diaphragm 11 to generate sound.
A sound outlet is arranged on the acoustic device, sound waves on the front side of the vibrating diaphragm 11 radiate outwards through the sound outlet, and sound waves on the rear side of the vibrating diaphragm 11 are reserved inside the acoustic device. A cavity is formed between the vibrating diaphragm 11 and the housing and the magnetic circuit system, a rear sound hole is generally formed on the housing or the magnetic circuit system or between the housing and the magnetic circuit system, and sound waves at the rear side of the vibrating diaphragm 11 can enter the interior of the acoustic device through the rear sound hole. In this embodiment, the vibration direction of the vibration diaphragm 11 of the sound generating unit 1 is parallel to the thickness direction of the acoustic device, which is advantageous for the thin design of the acoustic device.
Further, in this embodiment, the vibrating diaphragm 11 rear side forms inclosed first airtight chamber 21, the mounting hole has been seted up on the cavity wall of first airtight chamber 21 be equipped with flexible deformation portion 22 on the mounting hole the outside of first airtight chamber 21 is equipped with second airtight chamber 31, flexible deformation portion 22 is located first airtight chamber 21 with between the second airtight chamber 31, as shown in fig. 3.
When the acoustic device is in a working state, when the vibrating diaphragm 11 vibrates downwards to compress the volume at the rear side of the vibrating diaphragm 11, sound pressure is transmitted to the flexible deformation part 22 through the first closed cavity 21, and the flexible deformation part 22 expands and deforms towards the outer side of the first closed cavity 21; on the contrary, when the vibrating diaphragm vibrates upwards, the flexible deformation part 22 can contract inwards to deform, so that the volume of the first closed cavity 21 is adjusted, the equivalent acoustic compliance of the first closed cavity 21 is increased, the resonance frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved; and through the design of keeping apart sound generating unit 1 and flexible deformation portion 22, seal the radiation sound wave of flexible deformation portion 22 inside acoustic device, avoid the antiphase radiation sound wave of flexible deformation portion 22, cause the offset influence to the forward radiation sound wave of sound generating unit 1, and then the low band sensitivity of great amplitude promotion product on the whole.
In this embodiment, at least a part of the housing of the electronic device for mounting the acoustic device is used to form the first closed chamber 21 and/or the second closed chamber 31. 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 chamber wall of the first sealed chamber 21 is formed by the case of the electronic device, a part or the whole of the chamber wall of the second sealed chamber 31 is formed by the case of the electronic device, or a part or the whole of the chamber walls of the first sealed chamber 21 and the second sealed chamber 31 is formed by the case of the electronic device. According to the invention, the shell of the electronic equipment is used as the cavity wall of the first closed cavity and/or the second closed cavity, so that the internal space of the electronic equipment can be fully utilized, meanwhile, the space occupied by a part of the cavity wall is saved, and the thinning design of the electronic equipment is facilitated.
It should be noted that the "closed" described in this embodiment and the present invention may be a fully closed state in a physical structure, or may be a relatively closed state, for example, the first closed cavity may include a pressure equalizing hole that is provided to balance internal and external air pressures and has no significant influence on rapid change of sound pressure based on the use requirement of the product, or other open structures, and may also be regarded as a closed cavity. For example, the second sealed cavity may include a gap or the like generated when combined with the first sealed cavity, and a gap or the like of its own structure, which can effectively isolate the sound wave generated by the flexible deformation portion, and which has no significant influence on the sound wave generated by the sound generating unit, and which is also regarded as a sealed cavity. Typically, the total area of the openings or slits does not exceed 20mm2。
As a specific embodiment, the acoustic device includes a first casing 2, and as shown in fig. 2 and 4, the first casing 2 of this embodiment includes two parts, an upper casing 2a and a lower casing 2b, and the first casing 2 is provided as two independent parts, which is beneficial to the installation and fixation of the sound generating unit 1 and the flexible deformation portion 22. Sound generating unit 1 installs form sound production subassembly on first casing 2, sound generating unit 1's vibrating diaphragm 11 with form between the first casing 2 first airtight chamber 21 has seted up on the first casing 2 the mounting hole be equipped with on the mounting hole flexible deformation portion 22, mounting hole and flexible deformation portion 22 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 casing 3, the sound generating assembly is mounted in the second casing 3, and as shown in fig. 3, a second closed cavity 31 is formed between the second casing 3 and the first casing 1. Here, in the case where other components and circuit boards are present in the second casing 3, the second sealed chamber 31 is actually formed by the components and the circuit boards and the gap between the second casing 3 and the first casing 2.
The present invention is provided with a through groove 25 penetrating the sidewall of the chamber wall on the chamber wall of the first airtight chamber 21, as shown in fig. 4 and 7. Specifically, a mounting hole is formed in the upper case 2a of the sound generating module, the mounting hole has a recess 24 formed by a depression, as shown in fig. 2 and 4, a mounting surface 23 is formed at the bottom of the recess 24, and the edge portion of the flexible deformation portion 22 is bonded to the mounting surface 23 by means of bonding or the like. A through groove 25 penetrating through the side wall of the upper shell 2a is further arranged on one side surface of the groove 24, the through groove 25 is communicated with the groove 24 and the second closed cavity 31, and the air flow generated by the flexible deformation part 22 can be communicated with the second closed cavity 31 through the through groove 25. In this embodiment, the position of the first housing 2 facing the flexible deformation portion 22 is an open structure, that is, the upper side of the groove 24 is an open structure, so that the airflow of the flexible deformation portion 22 can be communicated with the second closed cavity 31 through the upper side thereof; in addition, a through groove 25 is further formed in the side face of the groove 24, and the air flow generated by the flexible deformation portion 22 can also be communicated with the second closed cavity through the through groove 25. The structure that the channels communicated with the second closed cavity 31 are arranged in the two directions can avoid the problem that the sensitivity improvement amplitude of the low-frequency band is reduced or the sensitivity improvement amplitude of the low-frequency band is invalid due to the fact that the communication channels of the flexible deformation part 22 facing to one direction or two directions of the second closed cavity 31 are completely or partially blocked by other parts in the second closed cavity 31 during assembly.
The flexible deformation portion 22 may be a single-layer structure or a multi-layer structure, where the single-layer structure may be made of one of polymer plastic, thermoplastic elastomer and silicone rubber, or the multi-layer structure may be made of one of polymer plastic, thermoplastic elastomer and silicone rubber. Of course, the materials and combinations are not limited to those described above.
Because the flexible deformation portion 22 is made of a flexible material and is easily damaged in the assembling process or the transportation process, the sound generating assembly of the present invention further includes a protective cover plate 5, the protective cover plate 5 may be made of a stainless material, or at least one of an epoxy plate, a PET, a PEN, a carbon fiber, or a ceramic plate, and covers the outer side of the flexible deformation portion 22, i.e., the position far away from the first sealed cavity 21, so as to protect the flexible deformation portion 22 from being damaged.
The protective cover plate 5 is provided with an air vent 50 penetrating through the protective cover plate 5, so that the air flow generated by the flexible deformation part 22 can be communicated with the second sealed cavity 31 through the air vent 50. The protective cover 5 includes a bottom wall and a fixing portion 55 fixedly combined with the first casing 2, wherein the bottom wall is provided with air holes 50. Fig. 3 is a schematic view of one of the assembling modes of the sound generating assembly, in the assembling mode of the structure shown in the figure, if the bottom wall is a plane, the part of the circuit board or the part in the second closed cavity 21, which is contacted with the bottom wall of the protective cover plate 5, just can block the bottom wall, and the air hole on the bottom wall is obviously easy to block, so that if the bottom wall is a plane structure, the risk of blocking in the second closed cavity is larger.
As an improvement, with reference to fig. 4-7, the bottom wall of the present invention includes a first surface 51 far away from the flexible deformation portion 22, and a sinking platform recessed toward the flexible deformation portion 22, the sinking platform is provided with a second surface 52, a height difference h exists between the first surface 51 and the second surface 52, as shown in fig. 6, and the air holes 50 are provided on both the first surface 51 and the second surface 52, so that the protective cover 5 with this structure reduces the risk that the protective cover 5 is easily blocked due to having only one planar bottom wall because the second surface 52 and the first surface 51 have a height difference and are not on the same plane. In the assembly shown in fig. 3, if the bottom wall of the protective cover 5 is covered by the circuit board or component in the second sealed cavity 31, only the first surface 51 can be covered, the first surface 51 is directly contacted with the circuit board or component, and in this case, the second surface 52 is not normally covered directly, and the air flow generated by the flexible deformation portion 22 can be communicated with the second sealed cavity 31 through the ventilation hole 50 on the second surface 52. After the air flow passes through the air holes 50 on the second surface 52, the air flow can be communicated with the second sealed cavity 31 through the gap between the bottom wall of the protective cover plate 5 and the circuit board or the component, and can also be communicated with the second sealed cavity 31 through the through groove 25 positioned on the side surface, even if any one of the two communicating channels is completely blocked, the other one of the two communicating channels can also be communicated with the second sealed cavity 31. The bottom wall of the protective cover plate 5 is provided with planes with different heights, so that the bottom wall can be prevented from being blocked completely, and the risk that the protective cover plate 5 is blocked can be obviously reduced by matching with two communicating channels in different directions, the risk that the air flow of the flexible deformation part 22 cannot be communicated with the second closed cavity 31 is reduced, and the low-frequency sensitivity of the acoustic device can be improved.
Preferably, the first surface 51 and the second surface 52 are arranged in parallel, and the parallel arrangement is simple in structural forming manner, and is convenient to avoid the flexible deformation portion 22, so that an avoiding space is provided for the vibration of the flexible deformation portion 22. In this embodiment, the second surface 52 is located at an edge position of the first surface 51, and the second surface 52 is disposed around the first surface 51, and the surrounding arrangement is favorable for increasing an area of the second surface 52, so that smoothness of the airflow communication between the flexible deformation portion 22 and the second sealed cavity 31 can be increased in a case where the first surface 51 is blocked. A step-like structure is formed between the first surface 51 and the second surface 52, and another step-like structure is formed between the second surface 52 and the fixing portion 55; specifically, an engagement surface 53 for engaging two planes is formed between the first surface 51 and the second surface 52, and an engagement surface for engaging two planes is also formed between the second surface 52 and the fixing portion 55, wherein the engagement surfaces between the engagement surface 53 and the second surface 52 and the fixing portion 55 are all of a slope structure; specifically, taking the structure of the engaging surface 53 as an example, the included angles between the first surface 51 and the engaging surface 53 and between the engaging surface 53 and the second surface 52 are obtuse angles, and the structure of the engaging surface 53 being an inclined surface can prevent the protective cover 5 from cracking during the forming process and can prevent the flexible deformation portion 22 from colliding with the engaging surface 53 and the second surface 52 during the vibration process. Preferably, the engagement surfaces between the first surface 51 and the engagement surface 53 and the second surface 52 are rounded 54, and the engagement by the rounded 54 increases the structural stability of the protective cover plate and prevents the protective cover plate 5 from cracking.
Preferably, the air holes 50 are also formed on the joint surface 53 between the first surface 51 and the second surface 52, and the air holes 50 at the position are also not easy to cover, so that the risk of blocking the air holes on the protective cover plate 5 can be reduced, and smooth communication between the air flow of the flexible deformation part 22 and the second sealed cavity 31 is facilitated. The ventilation hole 50 formed in the engagement surface 53 may be a large ventilation hole or a small ventilation hole, and a shielding member for preventing dust may be provided, or a shielding member may not be provided when the diameter of the small ventilation hole is sufficiently small.
With reference to fig. 5 and 6, the flexible deformation portion 22 of the present embodiment includes a middle portion 221 located at a middle position and a ring-folded portion 222 located at an edge position, wherein the middle portion 221 has a flat structure, and the ring-folded portion 222 has an arc structure. The flexible deformation 22 interacts with the structure of the protective cover 5, wherein the intermediate portion 221 is arranged opposite the first surface 51 and the folded-over portion 222 is arranged opposite the second surface 52 located at the edge. Because the second surface 52 is closer to the flexible deformation portion 22, in order to prevent the flexible deformation portion 22 from colliding with the second surface 52 in the vibration process, the arc-shaped structure of the loop portion 222 of the present embodiment protrudes to a side away from the protective cover 5, therefore, the protective cover 5 only needs to provide a smaller avoiding space for the loop portion 222, and compared with the structure that the loop portion 222 protrudes to a side close to the protective cover 5, the structure does not need to reserve an avoiding structure for the height of the loop portion 222, and the height difference between the corresponding second surface 52 and the fixing portion 55 can be properly reduced, it should be noted that the angle setting between the joining portion 53 and the second surface 52 is based on that the loop portion 222 does not collide with the protective cover 5 in the vibration process. The intermediate portion 221 and the first surface 51 are parallel to each other, and the orthogonal projection of the intermediate portion 221 to the first surface 51 is located in the region of the first surface 51 to prevent the intermediate portion 221 from colliding with the engagement surface 53 during vibration. Wherein, the distance between the middle part 221 and the first surface 51 is larger than the maximum amplitude of the flexible deformation part 22, so as to provide an avoidance space for the vibration of the flexible deformation part 22.
Preferably, the shape of the middle portion 221 is the same as the shape of the first surface 51, and orthographic projections of the two overlap, specifically, when projected to a plane parallel to both the first surface 51 and the middle portion 221, the orthographic projections overlap. The structure of the protective cover 5 can reduce the area of the first surface 51 to the maximum extent, increase the area of the second surface 52, and if the first surface 51 is blocked, the second surface 52 also has a larger area, so as to ensure the smoothness of the airflow.
For the structure of the present embodiment in which the protective cover 5 only needs to provide a smaller avoiding space for the corrugated portion 222, the protective cover 5 and the flexible deformation portion 22 may be first fixed into a whole by adhesive bonding, and then the assembly of the protective cover 5 and the flexible deformation portion 22 is fixedly combined with the first housing 2, specifically, combined on the mounting surface 23 at the bottom of the groove 24. In this embodiment, the side surface of the edge position of the fixing portion 55 is provided with an inward concave glue containing groove 56, as shown in fig. 5 and 7, a gap is formed between the glue containing groove 56 and the inner side wall of the mounting hole, specifically, a certain gap is formed between the glue containing groove 56 and the side wall of the groove 24, and glue is coated in the gap between the glue containing groove 56 and the side wall of the groove 24, so that the bonding strength between the side surface of the protective cover plate 5 and the side wall of the groove 24 is enhanced, and the firmness of bonding between the protective cover plate 5 and the first housing 2 can be further increased.
In this embodiment, the air holes 50 may be air holes, and the area of each air hole is less than or equal to 0.2mm2So that under the condition that can not influence the intensity of protective cover plate 5, ventilative micropore can prevent that liquid and impurity from invading the space between protective cover plate 5 and the flexible deformation portion 22, avoids causing the influence to the performance and the life of flexible deformation portion 22, and then can not need not to cause the influenceThe shielding piece for dust prevention is additionally arranged on the protective cover plate 5, so that the material cost and the assembly process can be reduced, and the Z-axis space of a product is saved.
The shape of the air-permeable micropores is not limited, and the air-permeable micropores can be designed in any shape such as a circle, an ellipse, a square or a polygon. In the embodiment, the air-permeable micropores are circular holes, and the diameter of the air-permeable micropores is less than or equal to 0.5mm so as to satisfy the requirement that the hole area is less than or equal to 0.2mm2. Preferably, the pore diameter of the air-permeable micro-pores 50 is 0.3mm or less. For example, the aperture is 0.3mm, so that better dustproof and waterproof effects can be achieved, and the difficulty and cost for manufacturing the micropores are relatively low. As another embodiment, the air-permeable micropores may also be oval, and smooth communication of air flow may also be achieved. The structure with the ventilation micropores does not need to be provided with a shielding piece, can simplify the assembly process of the acoustic device, and is more suitable for the condition that the structure of the protective cover plate 5 is more complex.
The air-permeable micro-holes may be disposed only on the first surface 51 and the second surface 52, or may be disposed on the first surface 51, the second surface 52 and the connecting surface 53 at the same time. The pore diameters and shapes of the gas-permeable micropores on the first surface 51, the second surface 52 and the connecting surface 53 may be completely the same, and the pore diameters and/or shapes of the three may also be different, or the pore diameters and shapes of two of the three surfaces are the same, and the pore diameter and/or shape of the other surface are different, and the arrangement of the above structures can realize the communication between the gas flow of the flexible deformation portion 22 and the second sealed cavity 31, all within the protection scope of the patent.
Certainly, the structure of the ventilation holes 50 is not limited to the above-mentioned embodiment, as another implementation, the ventilation holes 50 on the protective cover plate 5 may be a small number of large ventilation holes or a plurality of small ventilation holes, and a dustproof shielding member is further provided to cover the large ventilation holes or the small ventilation holes, so as to prevent liquid and impurities from entering the space between the protective cover plate 5 and the flexible deformation portion 22, and avoid affecting the performance and the service life of the flexible deformation portion 22. Wherein, the shielding piece can only cover the area of the air hole 50, and can also cover the protective cover plate 5 completely, and the dustproof effect is not influenced. As above, the vent holes 50 may be disposed only on the first surface 51 and the second surface 52, or may be disposed on the first surface 51, the second surface 52 and the connecting surface 53 at the same time. The apertures and shapes of the air holes 50 on the first surface 51, the second surface 52 and the connecting surface 53 may be completely the same, the apertures and/or shapes of the three may also be different, or the apertures and shapes of two surfaces thereof are the same, and the aperture and/or shape of the other surface is different, and the arrangement of the above structures can realize the communication between the air flow of the flexible deformation portion 22 and the second sealed cavity 31, all within the protection scope of the patent.
According to the invention, the first surface 51 and the second surface 52 with height difference are arranged on the protective cover plate 5, so that the protective cover plate 5 cannot block all air holes 50 on the protective cover plate 5 even if being covered by a circuit board or a part in the second closed cavity 31, the air flow generated by the flexible deformation part 22 can be still ensured to be smoothly communicated with the second closed cavity 31, and the improvement of the low-frequency sensitivity of the acoustic device is ensured.
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 (13)
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; it is characterized in that the preparation method is characterized in that,
the rear side of the vibrating diaphragm forms a first closed cavity, a mounting hole is formed in the cavity wall of the first closed cavity, a flexible deformation part is arranged on the mounting hole, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible deformation part is located between the first closed cavity and the second closed cavity, and sound waves generated by the flexible deformation part during deformation are sealed in the second closed cavity by the second closed cavity;
at least one part of a shell of the electronic equipment for mounting the acoustic device is used for forming the first closed cavity and/or the second closed cavity;
the mounting hole is also provided with a protective cover plate positioned on the outer side of the flexible deformation part, and the protective cover plate is provided with an air hole which penetrates through the protective cover plate and is communicated with the flexible deformation part and the second closed cavity;
the protective cover plate comprises a bottom wall positioned in the middle and a fixing part positioned at the edge and fixedly combined with the cavity wall, wherein a sinking platform which is sunken towards the direction of the flexible deformation part is arranged on one side of the bottom wall close to the fixing part; the bottom wall comprises a first surface far away from the flexible deformation part and a second surface arranged on the sinking platform, and a height difference is formed between the first surface and the second surface;
the first surface and the second surface are both provided with the air holes.
2. The acoustic apparatus of claim 1, wherein the second surface is disposed around the first surface, the first surface being parallel to the second surface;
an engagement surface for engaging the two planes is arranged between the first surface and the second surface.
3. The acoustic device according to claim 1, wherein the flexibly deformable portion comprises an intermediate portion at an intermediate position and a folded ring portion at an edge position, the intermediate portion has a flat plate-like structure, and the folded ring portion has an arc-shaped structure;
the folded ring part is protruded towards one side far away from the protective cover plate;
the middle portion is arranged opposite to the first surface, and the folded ring portion is arranged opposite to the second surface.
4. The acoustic apparatus of claim 3, wherein the intermediate portion is parallel to the first surface; the orthographic projection of the middle part to the first surface is positioned in the area of the first surface;
the distance between the middle part and the first surface is larger than the maximum amplitude of the flexible deformation part.
5. The acoustic apparatus of claim 4, wherein the shape of the middle portion is the same as the shape of the first surface, and the middle portion overlaps an orthographic projection of the first surface.
6. The acoustic device according to claim 1, wherein a concave glue containing groove is formed on a side surface of an edge position of the fixing portion, a gap is formed between the glue containing groove and an inner side wall of the mounting hole, and glue for fixing the protective cover plate and the cavity wall is coated in the glue containing groove.
7. The acoustic apparatus of any of claims 1-6, wherein the chamber wall of the first enclosed chamber comprises a first housing, the mounting hole being located on the first housing;
the mounting hole comprises a groove formed by sinking, a through groove communicated with the groove and the second closed cavity is formed in the side wall of the first shell, and air flow generated by the flexible deformation part can pass through the through groove and the second closed cavity.
8. The acoustic device according to claim 7, wherein the protective cover has a plurality of air-permeable micro holes opened therein, and an area of each air-permeable micro hole is equal to or smaller than 0.2 mm.
9. The acoustic device of claim 8, wherein the protective cover plate has a thickness of 0.2mm or less, the gas-permeable pores are circular pores, and the pores have a diameter of 0.3mm or less.
10. The acoustic device of claim 8, wherein the protective cover plate has a thickness of 0.2mm or less, and the gas-permeable pores are oval.
11. The acoustic device according to claim 7, wherein the protective cover plate is provided with a large gas-permeable hole or a plurality of small gas-permeable holes, and a shielding member covering the large gas-permeable hole or the small gas-permeable holes of the protective cover plate.
12. The acoustic device of claim 7, wherein the protective cover plate is made of one of steel, FR-4, PET, PEN, carbon fiber, and ceramic.
13. An electronic device, characterized in that: the electronic device comprises a housing of the electronic device and the acoustic apparatus of claims 1-12 mounted within the housing.
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| CN201910842936.1A CN110572755B (en) | 2019-09-06 | 2019-09-06 | Acoustic device and electronic apparatus |
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| CN201910842936.1A CN110572755B (en) | 2019-09-06 | 2019-09-06 | Acoustic device and electronic apparatus |
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| CN110572755B true CN110572755B (en) | 2021-11-26 |
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| CN110446139B (en) | 2019-08-20 | 2022-03-15 | 歌尔股份有限公司 | Acoustic device and electronic apparatus |
| CN112423203B (en) * | 2019-08-20 | 2022-03-15 | 歌尔股份有限公司 | Acoustic device and electronic apparatus |
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