CN209949410U - Acoustic device and electronic apparatus - Google Patents
Acoustic device and electronic apparatus Download PDFInfo
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- CN209949410U CN209949410U CN201920992916.8U CN201920992916U CN209949410U CN 209949410 U CN209949410 U CN 209949410U CN 201920992916 U CN201920992916 U CN 201920992916U CN 209949410 U CN209949410 U CN 209949410U
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
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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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- Acoustics & Sound (AREA)
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- Details Of Audible-Bandwidth Transducers (AREA)
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Abstract
The utility model discloses an acoustics device, include: the sound production unit comprises a vibration diaphragm, a first closed cavity is formed at the rear side of the vibration diaphragm, 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, and sound waves generated by the flexible deformation part during deformation are sealed in the second closed cavity by the second closed cavity; the flexible deformation part comprises a body part, the body part comprises a central part and a convex suspension part positioned outside the central part, and an elastic support structure used for balancing and supporting the vibration of the flexible deformation part is further arranged between the central part and the cavity wall. The utility model provides an acoustics device can effectively reduce resonant frequency, and great amplitude promotes the low band sensitivity of product on the whole.
Description
Technical Field
The utility model relates to an acoustics technical field, more specifically relates to an acoustics device and install electronic equipment of this acoustics device.
Background
In general, an acoustic system of a conventional structure (prior art 1) 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 limitation of the chamber in the acoustic system. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two approaches are generally taken, one being to dispose a sound absorbing material (e.g., activated carbon, zeolite, etc.) in a cabinet of the acoustic system, for adsorbing or desorbing gas in the enclosure to achieve the effect of increasing the volume and thus lowering the low frequency resonance frequency, and another is to provide a passive radiator (prior art 2) on the enclosure of the acoustic system, such as shown in figure 1, the sound system comprises a sounding unit 10, a box 20, a passive radiator 30, and a sound emitting unit and the passive radiator which radiate sound at the same time, wherein sound waves of the sounding unit and the passive radiator are communicated and superposed by using the principle that the passive radiator and the box form strong resonance at a specific frequency point fp (resonance frequency point), so that local sensitivity near the resonance frequency point fp is enhanced (for example, see patent CN 1939086A). However, the two approaches have problems, the first solution of adding sound-absorbing material in the cabinet needs to realize good sealing and packaging of the sound-absorbing material, otherwise if the sound-absorbing material enters the speaker unit, the acoustic performance of the speaker unit is damaged, and the service life of the speaker unit is affected; in the second scheme adopting the passive radiator, the passive radiator strongly radiates near a resonance frequency point fp, and the sound production unit is almost stopped, so that the local sensitivity of the acoustic system can be enhanced at a frequency band near fp through the high-sensitivity design of the passive radiator; however, in the frequency band below fp, the phases of sound waves of the passive radiator and the sound production unit are opposite, the sound waves are mutually counteracted, and the passive radiator plays a negative role in the sensitivity of an acoustic system. In summary, the passive radiator can only increase the sensitivity of the frequency band near the resonance point, but cannot increase the sensitivity of all the low frequency bands. As shown in fig. 2, fig. 2 is a test curve (SPL curve) of loudness at different frequencies for prior art 2 and prior art 1. There is a need for further improvements to the deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an effectively reduce resonant frequency, the whole acoustic device of great amplitude promotion product's low band sensitivity.
In order to solve the technical problem, the utility model provides a technical scheme is: 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 flexible deformation part comprises a body part, the body part comprises a central part and a convex suspension part positioned outside the central part, the suspension part is fixedly connected with the cavity wall, and an elastic supporting structure used for balancing and supporting the vibration of the flexible deformation part is further arranged between the central part and the cavity wall.
Preferably, the elastic support structure comprises an outer fixing portion, an inner fixing portion, and a deformation portion located between the outer fixing portion and the inner fixing portion.
Preferably, the hanging part is provided with a first protruding structure, the deformation part is provided with a second protruding structure, and the protruding directions of the first protruding structure and the second protruding structure are opposite.
Preferably, the deformation portion is a cantilever portion arranged between the outer fixing portion and the inner fixing portion, and the number of the cantilever portion is at least two.
Preferably, the flexible deformation portion further comprises a composite sheet combined on the central portion of the body portion, and the central portion is of a sheet-shaped integral structure or is of a hollow structure.
Preferably, the flexible deformation part is fixed on the surface of the cavity wall facing the first closed cavity;
or the flexible deformation part is fixed on the surface of the cavity wall facing the second closed cavity;
or, the mounting hole is peripheral by on the cavity wall the second airtight chamber orientation the direction in first airtight chamber is sunken to form the recess, flexible deformation portion is fixed in the tank bottom of recess.
Preferably, the body part of the flexible deformation part and/or the elastic support structure is a single-layer structure, and the single-layer structure is made of one of polymer plastics, thermoplastic elastomers and silicone rubber;
or the body part of the flexible deformation part and/or the elastic support structure are of a multilayer structure, and at least one layer of the multilayer structure is made of one of polymer plastics, thermoplastic elastomers and silicon rubber.
Preferably, the volume of the second closed cavity is larger than that of the first closed cavity;
at least a portion of a housing of an electronic apparatus for mounting an acoustic device is used to form the first enclosed cavity and/or the second enclosed cavity.
Preferably, the acoustic device includes a first casing, the sound generating unit is mounted on the first casing to form a sound generating assembly, the first sealed cavity is formed between a vibrating diaphragm of the sound generating unit and the first casing, the first casing is provided with the mounting hole, and the mounting hole is provided with the flexible deformation portion;
the acoustic device comprises a second shell, the sound production assembly is arranged in the second shell, a second closed cavity is formed between the second shell and the first shell, and the second shell is a shell of the electronic equipment.
Another object of the present invention is to provide an electronic device, which includes a casing of the electronic device and the acoustic device, wherein the acoustic device can effectively reduce the resonant frequency, and the overall low-frequency sensitivity of the product is greatly improved.
The utility model provides a technical scheme, the vibrating diaphragm rear side forms first airtight chamber among the acoustic device, cover on the mounting hole of the cavity wall of first airtight chamber and set up flexible deformation portion, still be equipped with the second airtight chamber that is used for sealing the sound wave that flexible deformation portion produced when deforming in the outside of first airtight chamber, through setting up flexible deformation portion, flexible deformation portion produces deformation along with the acoustic pressure, the volume size of first airtight chamber is adjustable to increase first airtight chamber equivalent acoustic compliance, effectively reduce acoustic device resonant frequency, promote low frequency sensitivity; and through the design of keeping apart sound generating unit and flexible deformation portion, seal the radiation sound wave of flexible deformation portion inside acoustic device, avoid the antiphase radiation sound wave of flexible deformation portion, cause the offset influence to the forward radiation sound wave of sound generating unit, and then the low band sensitivity of great amplitude promotion product on the whole.
Further, the utility model discloses in, through set up the elastic support structure between the body part and the cavity wall at flexible deformation portion, can be so that flexible deformation portion during operation under the higher, the great condition of displacement of product power, the equilibrium and the stability of flexible deformation portion vibration improve, and the maximum displacement that can bear obtains improving, and then can promote the volume regulatory action to a sealed chamber, has guaranteed the promotion reliability to product low frequency sensitivity.
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 is a schematic view of a structure of an acoustic device provided with a passive radiator according to the related art 2.
Fig. 2 is a graph showing a test of loudness at different frequencies (SPL curve) of an acoustic device in which a passive radiator is provided according to the related art 2 and an acoustic device in which a conventional structure according to the related art 1 is provided.
Fig. 3A is a schematic structural diagram of an acoustic device according to an embodiment of the present invention.
Fig. 3B is an enlarged schematic structural view of the flexible deformation portion in fig. 3A.
Fig. 4A is a schematic view of another structure of an acoustic device according to an embodiment of the present invention.
Fig. 4B is an exploded view of the flexible deformation portion of fig. 4A.
Fig. 5 is a test curve (SPL curve) of loudness of an acoustic device according to an embodiment of the present invention at different frequencies from an acoustic device of a conventional structure of the prior art 1.
Fig. 6 is a test curve (SPL curve) of loudness at different frequencies of an acoustic device according to an embodiment of the present invention and an acoustic device in which a passive radiator is provided in related art 2.
Fig. 7 is a schematic structural diagram of an acoustic device according to another embodiment of the present invention.
Fig. 8 is a schematic structural view of an electronic apparatus using an acoustic device according to the present invention.
Fig. 9 is a partially enlarged view of fig. 8.
Description of reference numerals:
1: a sound emitting unit; 11: vibrating the diaphragm; 2: a first housing; 21: a first closed cavity; 22, a flexible deformation part; 221. central portion, 222 suspension portion, 223 composite sheet, 224 resilient support structure, 2241 outer fixing portion, 2242 inner fixing portion, 2243 deformation portion, 224 'resilient support structure, 2241' outer fixing portion, 2242 'inner fixing portion, 2243' cantilever, 23: a pressure equalizing hole; 3: a second housing; 31, a second closed cavity; 4: a sound outlet; 5: an electronic device.
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.
The first embodiment is as follows:
as shown in fig. 3A and 4A, an acoustic device includes a sound generating unit 1, where in the present 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 production unit 1 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 11 fixed on the shell 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 that the vibration diaphragm 11 is driven to vibrate and produce sound.
The acoustic device is provided with a sound outlet 4, sound waves on the front side of the vibrating diaphragm 11 radiate outwards through the sound outlet 4, and sound waves on the rear side of the vibrating diaphragm 11 are left in 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, 11 rear sides of vibrating diaphragm form 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 in 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.
When the vibrating diaphragm 11 vibrates, the sound pressure inside the first closed cavity 21 changes, and the flexible deformation part 22 deforms along with the change of the sound pressure inside the first closed cavity 21, so as to flexibly adjust the volume of the first closed cavity 21; the second closed cavity 31 seals the sound wave generated by the flexible deformation part 22 during deformation in the second closed cavity 31.
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 5 may be a mobile phone, a tablet computer, a notebook computer, or 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. The utility model discloses in, the cavity wall in first airtight chamber and/second airtight chamber is done concurrently to electronic equipment's casing, can the inside space of make full use of electronic equipment, practices thrift the space that partly cavity wall occupy simultaneously, is favorable to electronic equipment's slim design more.
It should be noted that this embodiment reaches the utility model discloses in describe "seal", can be totally closed on the physical structure, also can be relative airtight state, for example, first airtight chamber can include based on product operation requirement, the pressure-equalizing hole 23 of playing inside and outside atmospheric pressure of equilibrium and not showing the influence to the acoustic pressure rapid change of seting up, or other trompil structures, also regard as airtight chamber. 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. In general, the sum of the above-mentioned openings or slitsThe area is not more than 20mm2。
Specifically, the flexible deformation portion 22 is fixed on the surface of the cavity wall of the first closed cavity 21, which faces the first closed cavity 21; alternatively, the flexible deformation portion 22 is fixed to the surface of the cavity wall of the first closed cavity 21 facing the second closed cavity 31. Or, the mounting hole is peripheral by on the cavity wall of first airtight chamber 21 second airtight chamber 31 orientation the sunken recess that forms of first airtight chamber 21's direction, flexible deformation portion 22 is fixed in the tank bottom of recess, the cavity volume in second airtight chamber 31 can not be taken up in this kind of design.
As a specific embodiment, acoustic device includes first casing 2, 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 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 shell 3, the sound generating assembly is arranged in the second shell 3, and a second closed cavity 31 is formed between the second shell 3 and the first shell 1. However, when other components are present in the second casing 3, the second sealed chamber 31 is actually formed by the components and the gap between the second casing 3 and the first casing 2.
In this embodiment, the sound generating unit 1 is disposed inside the first housing 2, and both are formed as an integral structure, and then assembled with the second housing 3. The first casing 2 is provided with an opening with which the diaphragm front side space communicates, through which sound is radiated to the sound outlet 4 of the acoustic device.
In this embodiment, with reference to the configuration diagrams of the electronic apparatus shown in fig. 8 and 9, the acoustic device is mounted in the electronic apparatus such as a mobile phone, and the housing of the electronic apparatus also serves as the second housing 3 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 31, the second shell of the acoustic device is omitted, the gap space between the parts of the shell of the electronic equipment is fully utilized, and the maximum design of the second closed cavity 31 can be realized.
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 effective acoustic compliance of the first closed cavity and the like 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.
Specifically, the flexible deformation portion 22 includes a main body portion, the main body portion includes a central portion 221 and a convex suspension portion 222 located outside the central portion 221, and the suspension portion 222 is fixedly connected to the cavity wall of the first sealed cavity 21. The main body of the flexible deformation portion 22 may be a single-layer structure made of one of polymer plastic, thermoplastic elastomer and silicone rubber, or a multi-layer structure with at least one layer made of one of polymer plastic, thermoplastic elastomer and silicone rubber.
Further, in order to improve the vibration effect, a composite sheet 223 may be stacked on the central portion 221 of the main body of the flexible deformation portion 22, wherein the strength of the composite sheet 223 is higher than that of the main body, and the composite sheet 223 may be metal, plastic, carbon fiber or a composite structure thereof. In addition, the central portion 221 may be a sheet-shaped integral structure or a hollow structure, and the hollow structure is sealed by the composite sheet 223.
In this embodiment, still be equipped with between the cavity wall of central part 221 and first airtight chamber 21 and be used for to the vibration of flexible deformation portion 22 plays balanced support effect's elastic support structure 224, and is specific elastic support structure includes outer fixed part 2241, interior fixed part 2242 and is located outer fixed part 2241 with deformation portion 2243 between the interior fixed part 2242. Through setting up elastic support structure, can be so that flexible deformation portion 22 during operation under the higher, great condition of displacement of product power, the equilibrium and the stability of the vibration of flexible deformation portion 22 improve, and the maximum displacement that can bear obtains improving, and then can promote the volume regulatory action to first airtight chamber 21, has guaranteed the promotion reliability to product low-frequency sensitivity.
As a specific example, as shown in fig. 3A and 3B, the hanging portion 222 is provided with a first convex structure, and the deformation portion 2243 is provided with a second convex structure, and the convex directions of the first convex structure and the second convex structure are opposite. Elastic deformation and supporting effect when realizing elastic support structure along with flexible deformation portion 22 vibration through the protruding structure of second can satisfy under the condition of big compliance, and flexible deformation portion 22's vibration keeps balanced, satisfies the reliability under the big amplitude condition of product simultaneously, promotes product low frequency effect, and tone quality is better.
As another specific example, as shown in fig. 4A and 4B, the deformation portion is a cantilever 2243 'disposed between the outer fixing portion 2241' and the inner fixing portion 2242 ', and at least two cantilever portions 2243' are disposed. Elastic deformation and supporting effect when realizing elastic support structure along with flexible deformation portion 22 vibration through many cantilever part 2243', keep balance when making flexible deformation portion 22 vibration, satisfy the reliability under the big amplitude condition of product simultaneously, promote product low frequency effect, tone quality is better.
The elastic support structure can be a single-layer structure made of one of polymer plastic, thermoplastic elastomer and silicon rubber, or a multi-layer structure, and at least one layer of the multi-layer structure is made of one of polymer plastic, thermoplastic elastomer and silicon rubber.
As a specific embodiment, the flexible deformation portion 22 may be integrally combined with other portions of the first housing 2, and the flexible deformation portion 22 may be manufactured first, and then the flexible deformation portion 22 is integrally injection-molded in other portions of the housing as an insert. Alternatively, the flexible deformation portion 22 and the first housing portion around the mounting hole may be fixedly connected by bonding, welding or hot melting.
In the present embodiment, the main bodies of the first closed chamber 21 and the second closed chamber 31 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.
The second casing 3 has a top wall, a bottom wall, and a side wall connecting the top wall and the bottom wall, and the sound outlet 4 of the acoustic device is provided on the top wall, the bottom wall, or the side wall. As shown in fig. 3 and 4, in the present embodiment, the sound outlet 4 is provided on the top wall, and the pressure equalizing hole 23 is provided on the first sealed chamber 21.
According to the technical scheme of the embodiment, the flexible deformation part 22 is arranged in the acoustic device, the flexible deformation part 22 deforms along with sound pressure, and the volume of the first closed cavity 21 is adjustable, so that 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; the sound radiation that produces in the isolated flexible deformation portion 22 deformation process of second airtight chamber 31, 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 product is promoted to great amplitude on the whole.
Moreover, in this embodiment, the volume of the second sealed cavity 31 is greater than the volume of the first sealed cavity 21, so that the flexible deformation portion 22 can deform more easily, which is more favorable for increasing the equivalent acoustic compliance of the first sealed cavity 21, effectively reducing the resonance frequency of the acoustic device, and improving the low-frequency sensitivity.
In prior art 1, the compliance of the acoustic device is formed by the compliance of the sound generating unit and the closed cavity in the box body in parallel, and the fs formula of prior art 1 is as follows:
wherein fs: a resonant frequency of the acoustic device; cas: equivalent sound compliance of the sound generating unit; cab: equivalent acoustic compliance of the air in the enclosure; mac: the vibration system of the sound generating unit is equivalent to the sound quality.
Fig. 2 is a test curve (SPL curve) of loudness of the acoustic device with the passive radiator of the prior art 2 and the acoustic device with the conventional structure of the prior art 1 at different frequencies, and fig. 5 is a test curve (SPL curve) of loudness of the acoustic device with the passive radiator/flexible deformation portion 22 of the prior art 1 at different frequencies, and the resulting compliance of the sound generating unit is increased due to compliance of the passive radiator/flexible deformation portion 22 connected in parallel, so that F0 is reduced. The fs formula for prior art 2 and this example is as follows:
wherein fs: a resonant frequency of the acoustic device; cas: equivalent sound compliance of the sound generating unit; cab: equivalent acoustic compliance of air in the first closed cavity; mac: the vibration system equivalent sound quality of the sound production unit; cap: equivalent acoustic compliance of passive radiator/flexible deformation.
In addition, in the prior art 2, the sound generating unit and the passive radiator radiate outward at the same time, the phases of sound waves of the sound generating unit and the passive radiator are opposite at frequencies below the resonance point fp, sound pressures are mutually offset, and the passive radiator plays a negative role in the sensitivity of the acoustic system.
Further, in this embodiment, referring to fig. 6, fig. 6 is a test curve (SPL curve) of loudness of the acoustic apparatus of this embodiment and the acoustic apparatus with passive radiator of the prior art 2 at different frequencies. Through setting up confined second airtight chamber 31, the sound wave that second airtight chamber 31 produced acoustic device vibrating diaphragm rear side is stayed in acoustic device's inside, specifically is kept apart the acoustic pressure that flexible deformation portion 22 produced through second airtight chamber 31, avoids the antiphase radiation sound wave that flexible deformation portion 22 deformation produced, causes the offset influence to the forward radiation sound wave of sound generating unit, and then the low band sensitivity of promotion product of great amplitude on the whole.
Example two:
the main difference between this embodiment and the above embodiments is that in this embodiment, the sound generating unit 1 and the first sealed cavity 21 are provided in a plurality of one-to-one correspondence, the second sealed cavity 31 is provided with one, and the cavity wall of each first sealed cavity 21 is provided with a flexible deformation portion. Specifically, as shown in fig. 7, the acoustic device in this embodiment includes two sound generating units 1, two first sealed cavities 21 are respectively and correspondingly designed, one second sealed cavity 31 is provided, and the cavity walls of the two first sealed cavities 21 are respectively designed with flexible deformation portions 22. Such a design may facilitate applications in the case of acoustic devices or systems requiring multiple sound emitting units 1, such as design requirements in stereo or array form. The number of the first closed cavities in the embodiment can be other than the number of the first closed cavities, and the first closed cavities and the second closed cavities form closed cavities together.
Example three:
the present embodiment discloses an electronic device 5, as shown in fig. 8 and fig. 9, the acoustic device in the above embodiments is installed on the electronic device 5, and the electronic device 5 may be a mobile phone, a tablet computer, a notebook, or the like.
The electronic device 5 comprises in particular a housing of the electronic device, at least a portion of which is intended to form the first closed chamber 21 and/or the second closed chamber 31 of the acoustic means. 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. The utility model discloses in, the cavity wall of first airtight chamber 21 and/second airtight chamber 31 is done concurrently to electronic equipment's casing, can the inside space of make full use of electronic equipment, practices thrift the space that partly cavity wall occupy simultaneously, is favorable to electronic equipment's slim design more.
In this embodiment, the acoustic device includes first casing 2, sound generating unit 1 is installed form the sound production subassembly on first casing 2, sound generating unit 1's vibrating diaphragm 11 with form between first casing 2 first airtight chamber 21 the mounting hole has been seted up on first casing 2 be equipped with flexible deformation portion 22 on the mounting hole, 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 further comprises a second shell 3, the sound generating assembly is arranged in the second shell 3, and a second closed cavity 31 is formed between the second shell 3 and the first shell 1. Wherein the second housing 3 is a housing of an electronic device. In fact, the space between the electronic device shell and the internal components and the space between the electronic device shell and the first shell 2 of the acoustic device form a second sealed cavity 31, the electronic device shell is also used as the second shell 3 of the acoustic device, the second shell of the acoustic device is omitted, the gap space between the electronic device shell components is fully utilized, the maximized design of the second sealed cavity 31 can be realized, and the thinned design of the electronic device is facilitated.
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 (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; 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;
the flexible deformation part comprises a body part, the body part comprises a central part and a convex suspension part positioned outside the central part, the suspension part is fixedly connected with the cavity wall, and an elastic supporting structure used for balancing and supporting the vibration of the flexible deformation part is further arranged between the central part and the cavity wall.
2. The acoustic device of claim 1, wherein the resilient support structure comprises an outer retainer portion, an inner retainer portion, and a deformable portion between the outer retainer portion and the inner retainer portion.
3. The acoustic device according to claim 2, wherein the suspension portion is provided with a first convex structure, and the deformation portion is provided with a second convex structure, and the first convex structure and the second convex structure protrude in opposite directions.
4. The acoustic device of claim 2, wherein the deformation portion is a cantilever portion disposed between the outer fixing portion and the inner fixing portion, the cantilever portion having at least two.
5. The acoustic device of claim 1, wherein the flexibly deformable portion further comprises a composite sheet bonded to a central portion of the body portion, the central portion being of a unitary sheet-like structure or the central portion being of a hollowed-out structure.
6. The acoustic apparatus of claim 1,
the flexible deformation part is fixed on the surface of the cavity wall facing the first closed cavity;
or the flexible deformation part is fixed on the surface of the cavity wall facing the second closed cavity;
or, the mounting hole is peripheral by on the cavity wall the second airtight chamber orientation the direction in first airtight chamber is sunken to form the recess, flexible deformation portion is fixed in the tank bottom of recess.
7. The acoustic device according to claim 1, wherein the body portion of the flexibly deformable portion and/or the elastic support structure is a single layer structure made of one of a polymer plastic, a thermoplastic elastomer, and a silicone rubber;
or the body part of the flexible deformation part and/or the elastic support structure are of a multilayer structure, and at least one layer of the multilayer structure is made of one of polymer plastics, thermoplastic elastomers and silicon rubber.
8. The acoustic device of claim 1,
the volume of the second closed cavity is larger than that of the first closed cavity;
at least a portion of a housing of an electronic apparatus 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 any one of claims 1 to 8, wherein the acoustic device includes a first housing, the sound generating unit is mounted on the first housing to form a sound generating assembly, the first sealed cavity is formed between a diaphragm of the sound generating unit and the first housing, the first housing is provided with the mounting hole, and the mounting hole is provided with the flexible deformation portion;
the acoustic device comprises a second shell, the sound production assembly is arranged in the second shell, a second closed cavity is formed between the second shell and the first shell, and the second shell is a shell of the electronic equipment.
10. An electronic device, characterized in that: the electronic device comprising 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 |
|---|---|---|---|
| CN201920992916.8U CN209949410U (en) | 2019-06-27 | 2019-06-27 | Acoustic device and electronic apparatus |
| PCT/CN2019/127845 WO2020258787A1 (en) | 2019-06-27 | 2019-12-24 | Acoustic apparatus and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920992916.8U CN209949410U (en) | 2019-06-27 | 2019-06-27 | Acoustic device and electronic apparatus |
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| CN209949410U true CN209949410U (en) | 2020-01-14 |
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| CN201920992916.8U Active CN209949410U (en) | 2019-06-27 | 2019-06-27 | Acoustic device and electronic apparatus |
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| CN (1) | CN209949410U (en) |
| WO (1) | WO2020258787A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070092096A1 (en) * | 2003-07-21 | 2007-04-26 | Roman Litovsky | Passive acoustical radiating |
| CN206274682U (en) * | 2016-12-26 | 2017-06-23 | 惠州市希雅电子有限公司 | A kind of integral type loudspeaker |
| CN107318073A (en) * | 2017-07-28 | 2017-11-03 | 歌尔股份有限公司 | Loudspeaker module and electronic equipment |
| CN107371107B (en) * | 2017-07-28 | 2021-10-08 | 苹果公司 | Speaker module and electronic equipment |
| CN108462929B (en) * | 2018-05-17 | 2020-10-20 | 歌尔股份有限公司 | Speaker module and electronic equipment |
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| WO2020258787A1 (en) | 2020-12-30 |
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