CN114801343A - Acoustic enhancement material block and application thereof, micro loudspeaker and application thereof - Google Patents

Acoustic enhancement material block and application thereof, micro loudspeaker and application thereof Download PDF

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Publication number
CN114801343A
CN114801343A CN202110116598.0A CN202110116598A CN114801343A CN 114801343 A CN114801343 A CN 114801343A CN 202110116598 A CN202110116598 A CN 202110116598A CN 114801343 A CN114801343 A CN 114801343A
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China
Prior art keywords
cavity
front cavity
acoustic enhancement
upper shell
enhancement material
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Pending
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CN202110116598.0A
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Chinese (zh)
Inventor
张磊
郭明波
龚畅
赵峻杰
马院红
刘仁坤
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Zhenjiang Best New Material Co ltd
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Zhenjiang Best New Material Co ltd
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Application filed by Zhenjiang Best New Material Co ltd filed Critical Zhenjiang Best New Material Co ltd
Priority to CN202110116598.0A priority Critical patent/CN114801343A/en
Priority to EP22745339.6A priority patent/EP4282641A4/en
Priority to JP2023546166A priority patent/JP2024504815A/en
Priority to PCT/CN2022/074666 priority patent/WO2022161467A1/en
Priority to KR1020237028857A priority patent/KR20230137966A/en
Publication of CN114801343A publication Critical patent/CN114801343A/en
Priority to US18/361,095 priority patent/US20230368765A1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/08—Corrugated paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/30—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being formed of particles, e.g. chips, granules, powder
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/02—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/42—Alternating layers, e.g. ABAB(C), AABBAABB(C)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/107—Ceramic
    • B32B2264/108—Carbon, e.g. graphite particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

The invention provides an acoustic enhancement material block and application thereof, and a micro loudspeaker and application thereof. The structural framework of the acoustic enhancement material block is formed by a single-layer framework material or by alternately laminating more than two layers of framework materials, and the raw materials of the acoustic enhancement material block also comprise a porous material, an adhesive and an auxiliary agent which are loaded in the structural framework. The invention also provides a micro loudspeaker, wherein the micro loudspeaker comprises an upper shell, a lower shell and a loudspeaker unit, the upper shell and the lower shell form an inner cavity, the loudspeaker unit is positioned in the inner cavity, one side of the upper shell is provided with a sound outlet, the inner cavity is divided into a front cavity and a rear cavity by taking a vertical surface of the loudspeaker unit relative to the side surface of the sound outlet as a boundary, and the front cavity is communicated with the sound outlet; the front cavity is provided with a sound outlet; the upper shell is internally provided with a front cavity resonant cavity communicated with the front cavity, and the front cavity resonant cavity is filled with an acoustic enhancement material. The micro loudspeaker can effectively improve the flatness of the high-frequency performance curve of the loudspeaker.

Description

Acoustic enhancement material block and application thereof, micro loudspeaker and application thereof
Technical Field
The invention relates to the technical field of loudspeakers, in particular to an acoustic enhancement material block and application thereof, and a micro loudspeaker and application thereof.
Background
With the continuous development of mobile phone terminal equipment, the requirements of users on the quality of mobile phone audio are higher and higher, and besides the overall loudness, the requirements of users on the sound quality are gradually improved. The high frequency performance of the micro-speaker, its frequency bandwidth, unevenness, severely impact the user's experience of music taste and detail.
Due to the existence of front acoustic cavity resonance and unit dome resonance, the FR curve of the high frequency response of the speaker tends to be uneven and bandwidth. In order to solve the problem, a method of adding a front cavity resonant cavity is mostly adopted. However, this method tends to cause a peak value (Q value) to be high, and the curve of the high frequency FR tends to be in an undesirable state.
At present, the technical means for improving the uneven high-frequency performance and low performance of the micro-speaker is single. For example:
1. the structure size of the front sound cavity and the sound outlet is improved, but the structure size is easily limited by the design of the instant ID of the product;
2. the corresponding audio algorithm is applied to correct the high frequency, but the sound effect distortion is easily caused, and the natural feeling is lost;
3. the front cavity resonant cavity is added, or a filtering structure is added in the front cavity resonant cavity, so that the cost of the die is increased, and meanwhile, the design limit of the product, namely the fixed ID, can also be met.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an acoustic enhancement material block, an application thereof, a micro speaker and an application thereof, in which the micro speaker can effectively improve the flatness of a high-frequency performance curve of the speaker by filling an acoustic enhancement material in a front cavity resonator, and the micro speaker has a simple manufacturing process and can reduce the difficulty of a mold.
In order to achieve the purpose, the invention provides an acoustic enhancement material block, the raw materials of the acoustic enhancement material block comprise a porous material, a framework material, an adhesive and an auxiliary agent, the structural framework of the acoustic enhancement material block is formed by a single-layer framework material or by alternately laminating more than two layers of framework materials, and the porous material, the adhesive and the auxiliary agent are loaded in the structural framework.
In the acoustic enhancement material block, the alternating lamination means that more than two single layers of skeleton materials are arranged in layers along a uniform direction.
In the specific embodiment of the present invention, the acoustic enhancement material block refers to a material capable of improving the acoustic performance of a device such as a speaker, and generally can increase the acoustic virtual volume of the device such as the speaker and reduce the lowest resonant frequency of the speaker device.
In particular embodiments of the present invention, the porous material, adhesive and auxiliary agent may be located on the surface of the framework material and/or penetrate within the internal voids of a single layer of framework material.
According to a specific embodiment of the present invention, the block of acoustic enhancement material generally comprises 5-15% of a framework material, 2-10% of an adhesive, 0.05-2% of an auxiliary agent, and the balance of a porous material, based on 100% of the total mass of the block of acoustic enhancement material, wherein the mass content of the adhesive in the block of acoustic enhancement material is calculated by the solid mass of the adhesive.
According to a particular embodiment of the invention, said block of acoustic enhancement material may be a single block and/or a block formed by stacking two or more blocks of acoustic enhancement material, typically laminar thin blocks. In some embodiments, the mass of acoustically enhanced material may be made by a firing, baking, or freeze-drying process.
According to particular embodiments of the present invention, the porous material may comprise one or a combination of two or more of zeolites, activated carbon, MOF materials.
According to a particular embodiment of the invention, the zeolite has a Si (silicon)/M mass ratio generally above 200, wherein M is generally a trivalent metallic element, i.e. a metallic element having a positive trivalent state, such as one or a combination of two or more of iron, aluminum, titanium.
According to a specific embodiment of the present invention, the zeolite comprises one or a combination of two or more of an MFI structure molecular sieve, an FER structure molecular sieve, a CHA structure molecular sieve, an IHW structure molecular sieve, a IWV structure molecular sieve, an ITE structure molecular sieve, an UTL structure molecular sieve, a VET structure molecular sieve, an MEL structure molecular sieve and an MTW structure molecular sieve.
According to particular embodiments of the present invention, the adhesive may include an organic adhesive and/or an inorganic adhesive.
According to the specific embodiment of the present invention, the organic adhesive may include one or a combination of two or more of polyacrylate suspension, polystyrene acetate suspension, polyvinyl acetate suspension, polyethylene vinyl acetate suspension, and polybutylene rubber suspension.
According to a specific embodiment of the present invention, the inorganic binder may include one or a combination of two or more of silica sol, alumina sol, and pseudoboehmite (e.g., SB powder).
According to a specific embodiment of the present invention, the auxiliary agent may include one or a combination of two or more of CMC (carboxymethyl cellulose), montmorillonite, kaolin, attapulgite and mica powder.
According to the specific embodiment of the invention, the mechanical property of the acoustic enhancement material block can be effectively improved by adding the skeleton material to form the structural skeleton. The skeletal material is typically a fibrous material, typically comprising one or a combination of two or more of fibrous paper, fibrous cloth, and fibrous felt.
According to a particular embodiment of the invention, the framework material is generally formed by an alternate stacking of layered and/or corrugated fibrous paper, fibrous cloth and fibrous felt, one of which is illustrated in fig. 1 by an alternate stacking of layered and corrugated fibrous material. In some embodiments, the corrugated height of the corrugated fiber paper, fiber cloth, and fiber felt is generally 0.2mm to 2 mm.
According to a specific embodiment of the present invention, the framework material may comprise chemical fibers, and in particular, the framework material may be prepared from chemical fibers by one of blending, bonding or wet forming.
According to a particular embodiment of the invention, the grammage of the framework material is generally 10g/m 2 -100g/m 2 。
According to a particular embodiment of the invention, the individual fibers of the chemical fibers have a diameter generally ranging from 2 μm to 40 μm.
According to particular embodiments of the present invention, the chemical fibers are generally composite fibers, and in some particular embodiments, the chemical fibers may include inorganic fibers and/or synthetic fibers. The inorganic fiber can comprise glass fiber and/or ceramic fiber, and the synthetic fiber can comprise one or the combination of more than two of terylene, chinlon, acrylic fiber, polypropylene fiber, vinylon and polyvinyl chloride fiber. In some embodiments, the chemical fibers may be surface treated to increase their properties, for example by modifying the surface of the chemical fibers with a silane coupling agent.
The invention further provides the application of the acoustic enhancement material block in the micro-speaker, when the acoustic enhancement material block is filled in the cavity of the micro-speaker, the acoustic volume of the cavity of the micro-speaker can be virtually enlarged, and the resonance frequency of the speaker is reduced.
The invention also provides a micro loudspeaker, wherein the micro loudspeaker comprises an upper shell, a lower shell and a loudspeaker unit, the upper shell and the lower shell form an inner cavity, the loudspeaker unit is positioned in the inner cavity, and one side of the upper shell is provided with a sound outlet; the inner cavity is divided into a front cavity and a rear cavity, wherein the front cavity is a cavity between the top of the loudspeaker and the upper shell, and the front cavity is communicated with the sound outlet; the interior of the micro loudspeaker is also provided with a front cavity resonant cavity, the front cavity resonant cavity is provided with a vent hole communicated with the front cavity, and the front cavity resonant cavity is filled with an acoustic enhancement material.
In a specific embodiment of the present invention, the upper housing and the lower housing are generally hermetically bonded (e.g., bonded by a glue) to form an inner cavity, wherein the upper housing is a top housing and a side housing of the micro-speaker, the lower housing is a bottom housing of the micro-speaker, and the inner cavity formed by the upper housing and the lower housing being bonded can accommodate the speaker unit. The speaker unit may be secured to a side wall of the upper housing, and a space generally remains between the top of the speaker unit and the upper housing (in some embodiments, the space is contained within the front volume). A buffer material such as foam is generally filled between the bottom of the speaker unit and the lower case. The height of the top of the loudspeaker unit in the micro loudspeaker is matched with the opening height of the sound outlet. The boundary of the front cavity is a vertical plane where the speaker unit is located relative to one side of the sound outlet hole and a horizontal plane where the top of the speaker unit is located. In this case, the front cavity may be regarded as a cavity between the speaker unit and the upper case, and the rear cavity may be a cavity of the remaining part of the inner cavity.
According to the specific embodiment of the present invention, the vent hole is used for communicating the front cavity resonant cavity and the front cavity, the size and the position of the vent hole are not particularly required, and a person skilled in the art can determine the appropriate size and the position of the vent hole according to actual needs as long as the purpose of the present invention can be achieved. The vent hole may be disposed at a port of the front cavity resonant cavity, and specifically may be disposed at a center or a side surface of the front cavity resonant cavity. The shape of the vent hole of the front cavity resonant cavity can be one of square, rectangle, circle, rhombus and ellipse.
According to a particular embodiment of the invention, the front cavity resonance chamber is located generally not lower in the vertical direction than the loudspeaker unit, i.e. generally above the loudspeaker or arranged parallel to the loudspeaker unit.
According to an embodiment of the present invention, the front cavity resonant cavity may be provided in the upper shell above the front cavity, for example in the upper shell above the center or above the periphery of the front cavity. The front cavity resonator may be disposed around the speaker unit. At this time, the inner top surface of the upper shell may be provided with a limiting protrusion, and the limiting protrusion is used for separating the front cavity and the rear cavity and preventing the front cavity and the rear cavity from being conducted. Specifically, the limiting protrusion is generally vertically downward and is disposed along the side edge of the speaker, and the height of the limiting protrusion matches with the distance from the top of the speaker unit to the top of the micro-speaker. The limiting bulge, the top of the loudspeaker unit and the upper shell jointly surround to form the front cavity.
According to a specific embodiment of the present invention, the front cavity resonant cavity may be further disposed in an upper shell above the rear cavity and communicated with the front cavity through the vent hole, and the upper shell further includes a first retaining wall and a second retaining wall disposed inside the micro-speaker, and the first retaining wall and the second retaining wall are generally fixed by being connected to an inner wall of the side housing. At this time, the upper case may be regarded as including a first case and a second case, the first case is a top case of the micro-speaker, and the second case (or called as a middle case) is composed of a side case of the micro-speaker, a first retaining wall and a second retaining wall. The first barricade is used for separating antechamber and back chamber, this moment the boundary in antechamber includes the vertical face at first barricade place the top surface of speaker and first casing, promptly, the top of first barricade, speaker unit, first casing and miniature speaker's side casing surround and form the antechamber, the back chamber is the cavity except the antechamber in the inner chamber promptly. The second baffle wall is used for separating the front cavity resonant cavity from the rear cavity so as to ensure that the front cavity resonant cavity and the rear cavity cannot be conducted. In some embodiments, the first housing and the second housing may be hermetically fixed by bonding, ultrasonic welding, or the like.
According to a specific embodiment of the present invention, the inner sidewall of the upper case may further include a boss (generally, an annular boss) for fixing the speaker. When the upper shell comprises a first shell and a second shell, the boss can be regarded as a part of the second shell, and the boss can abut against the first retaining wall and the side shell where the sound outlet is located and/or the side shell adjacent to the sound outlet. In the vertical direction, the boss is generally disposed in the middle of the micro-speaker.
According to an embodiment of the present invention, the speaker unit may include a diaphragm, a voice coil assembly fixedly coupled to the diaphragm, and a magnetic circuit system to which an edge of the diaphragm is fixed. When the front cavity resonant cavity is positioned above the front cavity, a horizontal plane where a vibrating diaphragm of the loudspeaker unit is positioned and the upper shell form the front cavity; when the front cavity resonant cavity is located above the rear cavity, namely when the micro-speaker comprises the first retaining wall and the second retaining wall, a front cavity is formed by a horizontal plane where a vibrating diaphragm of the speaker unit is located and a space between the first shell and the second shell.
According to a specific embodiment of the present invention, the volume of the acoustic enhancement material is generally controlled to be 10 to 90%, preferably 40 to 60%, of the total volume of the front cavity resonator. In some embodiments, the position of the acoustic enhancement material in the front cavity resonator may be close to the vent or far from the vent.
According to a particular embodiment of the invention, the acoustic enhancement material may comprise a mass (generally a block) of acoustic enhancement material and/or particles of acoustic enhancement material as described above. The particles of acoustical enhancement material may be a zeolite material as disclosed in application No. 201510388038.5 (publication No. CN105049997A, title of the invention: sound modified speaker system), etc., which is incorporated herein by reference in its entirety.
According to a specific embodiment of the present invention, when the front cavity resonant cavity is filled with the acoustic enhancement material block, a buffer material attached to an inner wall of the cavity may be further disposed inside the front cavity resonant cavity.
According to a specific embodiment of the present invention, when the front cavity resonant cavity is filled with the particles of the acoustic enhancement material, the vent may further have a mesh cloth disposed at the position of the vent, and the mesh cloth is used for spacing the particles of the acoustic enhancement material from the front cavity while preventing the particles of the acoustic enhancement material from falling off from the front cavity resonant cavity.
According to the specific embodiment of the invention, the acoustic enhancement material block can be filled in the rear cavity at other positions except the front cavity resonant cavity to virtually enlarge the volume of the rear cavity, so as to further improve the low-frequency performance of the loudspeaker.
The invention further provides an electronic device comprising the micro-speaker.
The invention has the beneficial effects that:
1. the acoustic enhancement material block provided by the invention adopts the framework material as the carrier, and the performance fluctuation of the acoustic enhancement material block caused by the difficulty in dispersion of the additive in the preparation process is avoided by directly loading the additive such as the porous material on the carrier; meanwhile, the application of the framework material can greatly enhance the mechanical strength of the acoustic enhancement material block; the addition of the auxiliary agent can obviously improve the drop-resistant reliability of the acoustic material.
2. In the case of using a stack of thin sheets of the acoustic enhancement material as a whole, the pores between the layered acoustic enhancement material blocks and the pores between the stacked skeleton materials in the acoustic enhancement material blocks provide sufficient gas flow passages so that gas can sufficiently interact with the acoustic enhancement material blocks. The mode can ensure that the mechanical property of the acoustic enhancement material block is excellent, the acoustic property of the loudspeaker is favorably improved, and the additional arrangement of a pore channel in the acoustic enhancement material block can be avoided, so that the risks of fragmentation and powder falling of the acoustic enhancement material block are reduced.
3. In the micro loudspeaker provided by the invention, the acoustic enhancement material block with a certain proportion is filled in the front cavity resonant cavity, so that the flatness of the high-frequency performance curve of the loudspeaker with the front cavity resonant cavity can be effectively improved, and compared with the mode of arranging the filter structure, the mode of improving the flatness of the high-frequency performance curve has better effect. Meanwhile, the micro loudspeaker provided by the invention is simple in manufacturing process and can reduce the difficulty of a mould.
Drawings
FIG. 1 is a schematic illustration of an alternate layering of the scaffold materials in some embodiments of the invention.
Fig. 2 is a schematic structural view of the acoustic enhancement block of example 1 when located in the front cavity resonator.
Fig. 3 is a schematic structural diagram of a micro-speaker according to embodiment 2.
Fig. 4 is a sectional view taken along the line a-a in fig. 3.
Fig. 5 is a schematic structural view of a micro-speaker according to embodiment 3.
Fig. 6 is a schematic structural view of a micro-speaker according to embodiment 3.
Fig. 7 is a sectional view taken along the line a-a in fig. 5.
Fig. 8 is a sectional view taken along the direction B-B of fig. 5.
Fig. 9 is a performance test curve of the micro-speaker of example 2 and comparative example 1.
Description of the symbols
1-upper shell, 2-lower shell, 4-loudspeaker unit, 5-rear cavity, 6-front cavity, 7-sound outlet hole, 8-front cavity resonant cavity, 81-air vent, 82-acoustic enhancement material, 11-first shell, 31-second shell, 41-vibrating diaphragm, 61-limiting bulge, 91-first retaining wall, 92-second retaining wall, 93-boss.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1
This embodiment provides a mass of acoustic enhancement material comprising 6.4% polyacrylate suspension, 0.1% CMC, 12.6% matrix material, and the balance porous material, based on the total weight of the mass of acoustic enhancement material taken as 100%. Wherein, the used porous material is an MFI structure molecular sieve, the Si/M mass ratio is 350, and M is aluminum; the used framework material is formed by alternately laminating layered fiber paper, the fiber paper is obtained by a wet process from chopped alkali-free glass fibers, and the fiber paper is subjected to surface treatment by a silane coupling agent KH 550. The basis weight of the fiber paper is 25g/m 2 The fiber diameter was 7 μm.
In the process of preparing the acoustic enhancement material block, firstly, cutting fiber paper into a size and a shape suitable for a loudspeaker cavity to be filled, then mixing polyacrylate suspension, CMC and MFI molecular sieve to form uniform slurry, and completely impregnating the cut fiber paper with the slurry to obtain a single-layer acoustic enhancement material thin block. In some embodiments, a plurality of fiber papers can be alternately laminated to obtain an acoustic enhancement material block with a multi-layer structure framework, the internal structure of the block can be as shown in fig. 1, the structure framework of the acoustic enhancement material block is formed by alternately laminating layered and corrugated glass fibers, and additives such as MFI molecular sieves are positioned between layers of the structure framework and penetrate into the interior of the structure framework.
Further, the single-layer acoustic enhancement material thin blocks are stacked layer by layer, so that an acoustic enhancement material block with an interlayer gap hole can be obtained, and fig. 2 is a schematic structural diagram of the block body when the resonant cavity is filled with the block body.
Example 2
The present embodiment provides a micro speaker, and fig. 3 to 4 are schematic structural diagrams of the micro speaker. As shown in fig. 3 to 4, the micro-speaker includes an upper case 1, a lower case 2, and a speaker unit 4.
The upper shell 1 and the lower shell 2 are bonded by glue to form a sealed inner cavity. In appearance, the upper shell 1 and the lower shell 2 together form a rectangular shell of the micro-speaker.
Wherein, the lower shell 2 is a bottom shell of the micro-speaker.
The upper shell 1 is a top shell and a side shell of the micro-speaker, and the top and the side of the upper shell 1 are of an integrally formed structure. One side surface of the upper shell 1 is provided with a sound outlet 7. The inside top surface of epitheca 1 is equipped with three vertical decurrent spacing archs 61, and spacing archs 61 is located the offside and the adjacent side of sound outlet 7, and spacing protruding 61 highly is less than the inner chamber height, and the horizontal distance between the spacing protruding 61 matches with loudspeaker unit 4's radial dimension.
The loudspeaker unit 4 is positioned in the inner cavity, foam is filled between the lower part of the loudspeaker unit and the lower shell 2, and the top edge of the loudspeaker unit 4 is bonded and fixed among the limiting bulges 61 through colloid. The speaker unit 4 includes a diaphragm 41, a voice coil assembly fixedly connected to the diaphragm 41, and a magnetic circuit system (not shown), wherein the diaphragm 41 is located on the top of the speaker unit 4, and the edge of the diaphragm 41 is fixed to the magnetic circuit system. The edge of the vibrating diaphragm 41 is provided with a fixing member extending outward, and the fixing member is clamped and fixed with the limiting protrusion 61. The space between the diaphragm 41, the limit projection 61 and the top case of the upper case 1 forms a front chamber 6, and the remaining space in the inner chamber is a rear chamber 5. Specifically, the rear chamber 5 includes a cavity between the side of the speaker unit 4 away from the sound outlet 7, the limiting protrusion 61, the upper case 1, and the lower case 2, and a cavity between both sides of the speaker unit 4 and the side case (the side adjacent to the sound outlet).
A front cavity resonant cavity 8 is arranged in the upper shell 1 above the center of the front cavity 6, a vent hole 81 is arranged at one side port of the front cavity resonant cavity 8, and the front cavity resonant cavity 8 is communicated with the front cavity 6 through the vent hole 81.
The side of the front cavity 8 remote from the vent 81 is filled with the mass 82 of acoustic enhancement material of example 1, the volume of the mass 82 of acoustic enhancement material being 50% of the volume of the front cavity 8. The shape of the block 82 of acoustic enhancement material used in this embodiment is a shape conforming to the cavity envelope of the front cavity resonator 8, and the specific filling state in the front cavity resonator 8 is shown in fig. 2. The front cavity resonant cavity 8 can be also internally provided with a buffer material attached to the inner wall of the cavity.
In other embodiments, the mass 82 of acoustic enhancement material may be replaced by other acoustic enhancement material in the form of particles, and in this case, the ventilation holes 81 of the front cavity resonator 8 may be further provided with a mesh for spacing the particles of acoustic enhancement material from the front cavity 6 while preventing the particles of acoustic enhancement material from falling out of the front cavity resonator 8.
Example 3
The present embodiment provides a micro speaker, and fig. 5 to 8 are schematic structural diagrams of the micro speaker. As shown in fig. 5 to 8, the micro-speaker includes an upper case 1, a lower case 2, and a speaker unit 4.
As shown in fig. 6, the upper case 1 and the lower case 2 are bonded to form a sealed inner cavity, and the upper case 1 and the lower case 2 together form a rectangular housing of the micro-speaker in appearance. The upper shell 1 is a top shell, a side shell and an inner shell of the micro-speaker, and the lower shell 2 is a bottom shell of the micro-speaker.
The upper case 1 of the present embodiment is further provided with a first retaining wall 91, a second retaining wall 92, and an annular boss 93 on the basis of the upper case 1 in embodiment 2. Specifically, the upper case 1 of the present embodiment includes a first case 11 and a second case 31. The first casing 11 is a top casing of the micro-speaker, and the second casing (or called middle casing) 31 includes a side casing (hereinafter referred to as "side casing") of the micro-speaker, a first retaining wall 91 fixed to an inner wall of the side casing, a second retaining wall 92, and an annular boss 93. One side surface of the second housing 31 is provided with a sound outlet 7.
The first retaining wall 91 and the second retaining wall 92 are provided along the direction in which the upper case 11 extends toward the lower case 2. The first retaining wall 91 is linear.
An annular boss 93 is provided between the side casing and the first retaining wall 91. The vertical distance between the annular boss 93 and the first housing 11 substantially matches the vertical height of the first retaining wall 91.
The speaker unit 4 is fixed inside the micro speaker by being embedded into the annular boss 93, a space is left between the top surface of the speaker unit 4 and the first housing 11, and foam is filled between the bottom surface of the speaker unit 4 and the lower housing 2.
The speaker unit 4 includes a diaphragm 41, a voice coil assembly fixedly connected to the diaphragm 41, and a magnetic circuit system (not shown), wherein the diaphragm 41 is located on the top of the speaker unit 4, and the edge of the diaphragm 41 is fixed to the magnetic circuit system. The edge of the diaphragm 41 is provided with a fixing member extending outward, and the fixing member is fastened to the first retaining wall 91.
The cavity among the side shell where the sound outlet 7 is located, the first shell 11, the speaker unit 4 and the first retaining wall 91 is a front cavity 6, and the cavity in the inner cavity except the front cavity 6 is a rear cavity 5. Specifically, the rear cavity 5 includes a vertical surface on the side of the first retaining wall 91 away from the sound outlet 7, the first housing 11, and a cavity between the lower shell 2 and the side shell, and a cavity located on the vertical surface on the side of the first retaining wall 91 away from the sound outlet 7 and located between the vibrating diaphragm 41 and the lower shell 2.
The second wall 92 is a broken line shape, and is located in the rear cavity 5, and surrounds the side shell, the first wall 91 and the first shell 11 to form the front cavity resonant cavity 8. The front cavity resonance chamber 8 is arranged close to the loudspeaker unit 4 on the side of the rear cavity 5 close to the front cavity. The front cavity resonant cavity 8 is provided with a vent hole 81 at the first retaining wall 91, and the front cavity resonant cavity 8 is communicated with the front cavity 6 through the vent hole 81. The size of the opening of the vent hole 81 is smaller than the height of the front cavity resonant cavity. The side of the front cavity 8 remote from the vent 81 is filled with the mass 82 of acoustic enhancement material of example 1, the volume of the mass 82 of acoustic enhancement material being 50% of the volume of the front cavity 8. The shape of the block 82 of acoustic enhancement material used in this embodiment is a shape conforming to the cavity envelope of the front cavity resonator 8, and the specific filling state in the front cavity resonator 8 can be as shown in fig. 2. The front cavity resonant cavity 8 can be provided with a buffer material attached to the cavity wall.
In other embodiments, the mass 82 of acoustic enhancement material may be replaced by other acoustic enhancement material in the form of particles, and in this case, the ventilation holes 81 of the front cavity resonator 8 may be provided with a mesh for spacing the particles from the front cavity 6 while preventing the particles of acoustic enhancement material from falling out of the front cavity resonator 8.
Comparative example 1
This comparative example provides a micro-speaker having substantially the same construction as that of the micro-speaker of example 2 except that no material (including the block 82 of acoustic enhancement material or other acoustic enhancement material of example 1) is filled in the front cavity resonance chamber 8 only in the micro-speaker of this comparative example.
Test example 1
The micro-speaker of example 2 and the micro-speaker of comparative example 1 were subjected to a performance test, and a high frequency response curve was measured as shown in fig. 9. As can be seen from fig. 9, compared with the micro-speaker without the acoustic enhancement material block, the high-frequency performance curve of the micro-speaker with the acoustic enhancement material block filled in the front cavity resonant cavity is flatter, which indicates that the acoustic enhancement material block filled in the front cavity resonant cavity has a great effect on improving the sound quality of the micro-speaker.

Claims (10)

1. The acoustic enhancement material block comprises a porous material, a framework material, an adhesive and an auxiliary agent, wherein a structural framework of the acoustic enhancement material block is formed by a single-layer framework material or more than two layers of framework materials which are alternately stacked, and the porous material, the adhesive and the auxiliary agent are loaded in the structural framework.
2. A mass of acoustically enhancing material according to claim 1, wherein said mass of acoustically enhancing material comprises, based on 100% of the total mass of said mass of acoustically enhancing material, 5-15% of a matrix material, 2-10% of an adhesive, 0.05-2% of an auxiliary agent, and the balance being a porous material, the mass of said adhesive being calculated as the solid mass of said adhesive.
3. A block of acoustic enhancement material according to claim 1 or 2, wherein the block of acoustic enhancement material is a single block and/or a block formed by stacking more than two blocks of acoustic enhancement material.
4. A mass of acoustically enhancing material as claimed in claim 1 or 2, in which the skeletal material comprises one or a combination of two or more of a fibrous paper, a fibrous cloth and a fibrous felt;
preferably, the framework material is formed by alternately laminating layered and/or corrugated fiber paper, fiber cloth and fiber felt;
more preferably, the corrugated height of the corrugated fiber paper, the fiber cloth and the fiber felt is 0.2mm-2 mm.
5. A mass of acoustically enhancing material according to claim 1 or 2, wherein the porous material comprises one or a combination of two or more of a zeolite, activated carbon, MOF material; the adhesive comprises an organic adhesive and/or an inorganic adhesive; the auxiliary agent comprises one or the combination of more than two of CMC, montmorillonite, kaolin, attapulgite and mica powder; the skeletal material comprises chemical fibers;
preferably, the Si/M mass ratio of the zeolite is more than 200, wherein M is a trivalent metal element, and preferably comprises one or a combination of more than two of iron, aluminum and titanium; more preferably, the zeolite comprises one or a combination of two or more of an MFI structure molecular sieve, an FER structure molecular sieve, a CHA structure molecular sieve, an IHW structure molecular sieve, a IWV structure molecular sieve, an ITE structure molecular sieve, an UTL structure molecular sieve, a VET structure molecular sieve, an MEL structure molecular sieve and an MTW structure molecular sieve;
preferably, the organic adhesive comprises one or a combination of more than two of polyacrylate suspension, polystyrene acetate suspension, polyvinyl acetate suspension, polyethylene vinyl acetate suspension and polybutylene rubber suspension;
preferably, the inorganic adhesive comprises one or a combination of more than two of silica sol, aluminum sol and pseudo-boehmite;
preferably, the framework material is prepared from chemical fibers by one of blending, bonding or wet forming;
preferably, the grammage of the framework material per unit area is 10g/m 2 -100g/m 2 ；
Preferably, the diameter of the single fiber in the chemical fiber is 2-40 μm;
preferably, the chemical fibers comprise inorganic fibers and/or synthetic fibers;
more preferably, the inorganic fibers comprise glass fibers and/or ceramic fibers; the synthetic fiber comprises one or the combination of more than two of terylene, chinlon, acrylic fiber, polypropylene fiber, vinylon and polyvinyl chloride fiber.
6. Use of a block of acoustically enhancing material as claimed in any one of claims 1 to 5 in a microspeaker.
7. A micro speaker comprises an upper shell, a lower shell and a speaker unit, wherein the upper shell and the lower shell form an inner cavity, the speaker unit is positioned in the inner cavity, and one side of the upper shell is provided with a sound outlet;
the inner cavity is divided into a front cavity and a rear cavity, wherein the front cavity is a cavity between the top of the loudspeaker and the upper shell, and the front cavity is communicated with the sound outlet;
the interior of the micro loudspeaker is also provided with a front cavity resonant cavity, the front cavity resonant cavity is provided with a vent hole communicated with the front cavity, and the front cavity resonant cavity is filled with an acoustic enhancement material.
8. The microspeaker of claim 7 wherein the front cavity resonant cavity is disposed in the upper shell above the front cavity or in the upper shell above the back cavity;
preferably, when the front cavity resonator is located in the upper shell above the rear cavity, the upper shell further includes a first retaining wall and a second retaining wall, the first retaining wall is located inside the micro-speaker and used for separating the front cavity from the rear cavity, and the second retaining wall is used for separating the front cavity resonator from the rear cavity;
preferably, when the front cavity resonant cavity is located in the upper shell above the front cavity, a limiting protrusion is further arranged on the top surface inside the upper shell, and the limiting protrusion is used for separating the front cavity from the rear cavity;
preferably, the inner side wall of the upper shell is further provided with a boss, and the boss is used for fixing the loudspeaker unit.
9. A microspeaker according to claim 7, wherein the volume of the acoustic enhancement material is 10-90%, preferably 40-60%, of the total volume of the front cavity resonator;
preferably, the acoustic enhancement material comprises particles of acoustic enhancement material and/or a mass of acoustic enhancement material according to any of claims 1 to 5;
preferably, when the acoustic enhancement material block is filled in the front cavity resonant cavity, a buffer material attached to the inner wall of the cavity is arranged in the front cavity resonant cavity;
preferably, when the front cavity resonant cavity is filled with the acoustic enhancement material particles, a mesh cloth is further arranged at the vent hole.
10. An electronic device comprising the micro-speaker of any one of claims 7-9.
CN202110116598.0A 2021-01-28 2021-01-28 Acoustic enhancement material block and application thereof, micro loudspeaker and application thereof Pending CN114801343A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN202110116598.0A CN114801343A (en) 2021-01-28 2021-01-28 Acoustic enhancement material block and application thereof, micro loudspeaker and application thereof
EP22745339.6A EP4282641A4 (en) 2021-01-28 2022-01-28 Acoustic reinforcing material block and application thereof, micro loudspeaker and electronic device
JP2023546166A JP2024504815A (en) 2021-01-28 2022-01-28 Acoustic reinforcement blocks and their applications, micro speakers and electronic equipment
PCT/CN2022/074666 WO2022161467A1 (en) 2021-01-28 2022-01-28 Acoustic reinforcing material block and application thereof, micro loudspeaker and electronic device
KR1020237028857A KR20230137966A (en) 2021-01-28 2022-01-28 Sound reinforcement material blocks and their applications, micro speakers and electronic devices
US18/361,095 US20230368765A1 (en) 2021-01-28 2023-07-28 Acoustic reinforcing material block and application thereof, micro loudspeaker and electronic device

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CN215040822U (en) * 2021-01-28 2021-12-07 镇江贝斯特新材料有限公司 Micro speaker and electronic device

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