CN105554676A - Horn vibrating diaphragm and forming technology thereof - Google Patents
Horn vibrating diaphragm and forming technology thereof Download PDFInfo
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- CN105554676A CN105554676A CN201510805532.7A CN201510805532A CN105554676A CN 105554676 A CN105554676 A CN 105554676A CN 201510805532 A CN201510805532 A CN 201510805532A CN 105554676 A CN105554676 A CN 105554676A
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- vibration film
- horn vibration
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- injection
- state silicon
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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
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
Abstract
The invention relates to the technical field of vibrating diaphragms, and particularly relates to a horn vibrating diaphragm and a forming technology thereof. The forming technology comprises the following steps that (A) surface treatment is performed on a plastic shell and an intermediate diaphragm, and impurities are removed; (B) the plastic shell and the intermediate diaphragm after surface treatment are arranged in the rear mould of a plastic injection mould, then a front mould is locked by certain pressure, the external side surfaces of the moulds are respectively extruded by utilizing an extrusion mould after the front mould and the rear mould are closed, and then liquid silica gel is injected in the mould of the plastic injection mould; and (C) the injected liquid silica gel is formed through sulfuration so that the horn vibrating diaphragm is obtained. According to the forming technology, injection formation is performed by using liquid silica gel, and the manufactured vibrating diaphragm has advantages of high elasticity, high toughness, great transient state, sensitivity and frequency response and lasting great sound quality.
Description
Technical field
The present invention relates to a kind of vibrating diaphragm technical field, be specifically related to a kind of horn vibration film and moulding process thereof.
Background technology
Along with people's living standard improves, requirement for a series of sound equipment such as earphone, loud speaker facility is more and more higher, particularly for the requirement of mobile phone and built-in earplug loud speaker, trend of its development has the audio and more and more less sound-producing device of becoming better and better.Vibrating diaphragm is as one of the key component of sounding original paper, and have vital impact to the tonequality of loud speaker, therefore the design of vibrating diaphragm is one of important topic of constantly bringing forth new ideas in the industry always.
The objective indicators such as the frequency response curve of loud speaker determine primarily of the geometry of vibrating diaphragm, and the subjective index such as the tonequality of loud speaker, acoustics sense of hearing determines primarily of the material of vibrating diaphragm.There is the vibrating diaphragm of the loud speaker of excellent tonequality and sense of hearing must possess two conditions: one is the segmentation vibrations that as far as possible can reduce self, and two is have enough good rigidity.So-called segmentation vibrations refer to loud speaker self in the transmittance process of power and deformation occur, and produce a lot of noise different from sound source, make a riot of sound unclear of loud speaker, even the phenomenon of serious distortion.And enough good rigidity, can reduce segmentation vibrations, be also a guarantee of tonequality simultaneously.The making material of vibrating diaphragm has a lot, such as metal vibration diaphragm, papery vibrating diaphragm, tiffany vibrating diaphragm, plastics vibrating diaphragm, biological vibrating diaphragm etc., the material of vibrating membrane is to the most important parts of loudspeaker unit quality influence, the vibrating membrane of unlike material different process has different Young's moduluss, relative damping, density, percentage elongation, hot strength, tearing toughness etc., these performances directly have influence on quality factor Q value, cause headphone unit different quality.
Wherein, papery vibrating diaphragm is popular long, is widely used on some loud speakers, but due to the shortcoming of papery vibrating diaphragm moisture-sensitive, thus makes its tonequality unstable, gradually replace by other vibrating diaphragm.Plastics vibrating diaphragm has the advantages such as cost is low, plasticity good, easy processing, but the poor rigidity of plastics vibrating diaphragm, and this drastically influence the tonequality of loud speaker.Under normal circumstances, those skilled in the art are by carrying out modification to plastics, and add some fibers strengthening rigidity to improve the rigidity of vibrating diaphragm, but make the cost of vibrating diaphragm significantly increase like this, tonequality but can not get obvious improvement.
Summary of the invention
The object of the invention is for deficiency of the prior art, a kind of horn vibration film and moulding process thereof are provided, it uses liquid-state silicon gel to carry out injection moulding, and obtained vibrating membrane has the advantage such as high resiliency, high tenacity, preferably transient state, sensitivity, frequency response, lasting good tonequality.
Object of the present invention is achieved through the following technical solutions:
A moulding process for horn vibration film, comprises the following steps:
Step (A): carry out surface treatment to plastic casing and middle diaphragm, removes impurity;
Step (B): the plastic casing after surface treatment and middle diaphragm are positioned in the rear mold of injection mold, then with the sealed front mould of certain pressure, after front mould and rear mold matched moulds, utilize extrusion die to extrude respectively to the lateral surface of mould, the mold-in injection then toward injection mold enters liquid-state silicon gel;
Step (C): by the liquid-state silicon gel sulfidization molding after injection moulding, i.e. obtained horn vibration film.
Wherein, the temperature of sulfidization molding is 80-140 DEG C, and preferably, the temperature of sulfidization molding is 90-130 DEG C;
Wherein, the pressure of sealed front mould and rear mold is 10-130bar, and preferably, the pressure of sealed front mould and rear mold is 15-120bar.
Further, the vulcanizing agent in described sulfidization molding is N, N '-penylene bismaleimides and xanthic acid be the mixture of 2-7:0.1-0.4 by weight; Preferably, vulcanizing agent is N, N '-penylene bismaleimides and xanthic acid be the mixture of 3-5:0.15-0.2 by weight.
Particularly, the pressure of injection liquid silica gel is 10-110bar; Preferably, the pressure of injection liquid silica gel is 15-100bar.
Wherein, plastic casing and middle diaphragm can be circle, rectangle, polygon or irregular geometric figure.
Preferably, plastic casing inner chamber and middle diaphragm outline are the rectangle of band rounding, and the plastic casing length of side is 7.2mm, and thickness is 0.1-10mm, and the middle diaphragm length of side is 14.47mm, and thickness is 0.1mm.
The injection moulding thickness of liquid-state silicon gel is 0.1-0.12mm, does not need manually to put, realizes encapsulate shaping, greatly reduce production process, reduce production difficulty, improves production efficiency and reduces production cost.
Wherein, cementing operation is also included between described step (A) and step (B), be coated with one deck glue material layer respectively in the outside of the inner side of plastic casing and middle diaphragm, and then the plastic casing and middle diaphragm that are coated with glue material layer are placed in mould.
Before injection liquid silica gel, front frame place glue material being applied to plastic casing and middle film contact, during injection moulding can together with liquid-state silicon gel forming and hardening, avoid regelate and cause impact on vibrating membrane rigidity, and liquid-state silicon gel solidification area is the joint face between plastic casing and middle diaphragm, do not need coated, cost-saving for whole middle diaphragm.
When injection moulding, liquid silica gel can be full of in injection molding cavity fast, be coated with in the region of glue material when liquid-state silicon gel flows rapidly to, liquid-state silicon gel and glue material curing molding as a whole, prevent because of glue material premature setting, cause there is a glue layer between the liquid-state silicon glued membrane of curing molding and plastic casing, middle diaphragm, be conducive to the tonequality promoting horn vibration film, and the long service life of obtained horn vibration film.
The glue material that glue material layer of the present invention adopts is made up of the raw material of following weight portion:
Tetraethoxysilane 50-60 part aliphatic hydrocarbon 10-20 part lower alcohol 10-15 part titanate esters-silane coupler 3-8 part.
Glue material of the present invention is a kind of one-pack-type silane coupling agent class surface conditioning agent, there is the advantages such as easy to operate, bonding force is strong, the good weatherability of goods, after brushing this product, there is longer the adhered time, technical indicator outward appearance: light yellow transparent liquid, proportion is 0.835g/ml, and viscosity is 11s (being coated with 4 glasss).
Using method is: 1, first with the greasy dirt of thiacyclohexane, normal heptane equal solvent removing plastic casing, middle membrane surface and dust.2, after solvent evaporates is complete, (about need 3 ~ 5 minutes), treat maxxaedium brushing one deck glue material equably.3, by scribbling the plastic casing of glue material, middle diaphragm proceeds in baking box in 100 ± 10 DEG C of baking 15min.4, take out scribble the plastic casing of glue material, middle diaphragm is placed in drying box and is cooled to room temperature.5, cooled plastic casing, middle diaphragm are put into model and liquid-state silicon gel material pressurized heat sulfidization molding.
Wherein, described step (B) enters liquid-state silicon gel, wherein amount of silica gel >=90% of liquid-state silicon gel toward the mold-in injection of injection mold, and the hardness of liquid-state silicon gel is 40-80 degree.When liquid-state silicon gel hardness is lower than 40 degree, be unfavorable for the shaping of liquid-state silicon glued membrane, and the hardness of liquid-state silicon gel is higher than 80 degree, the audio frequency of obtained vibrating membrane then can lower than 500HZ, and audio effect is poor.The hardness of liquid-state silicon gel of the present invention is moderate, and when injection moulding, liquid silica gel can be full of in injection molding cavity fast, and the audio frequency of obtained horn vibration film can reach 570HZ, and audio is good.
Wherein, described surface treatment is UV photo-irradiation treatment or inorganic agent process.Surface treatment is cleaned surface of the work exactly, clean dust, deburring, degreasing, descale etc., after surface treatment, make liquid-state silicon gel cleaner with the contact-making surface of plastic casing and middle diaphragm respectively, be conducive to connective stability when improving liquid-state silicon gel disposal molding.
Wherein, described UV photo-irradiation treatment comprises gumming, corona, oiling, glazing and cooling step successively.Use the surface of high-frequency ac voltage to plastic casing and middle diaphragm of 5000-8000V/m2 to carry out Corona discharge Treatment, allow its surface produce frosting and produce radical reaction and make polymer generation crosslinked.Surface is roughening and increase its liquid towards silica gel adhesive ability.
Oiling comprises the raw material of following weight portion: prepolymer 60-80 part, reactive diluent 5-10 part and initator 1-5 part, prepolymer uses epoxy (methyl) acrylate, reactive diluent using function acrylate or functional methacrylate, initator uses benzophenone.
Namely glazing adopts ultraviolet energy value to be 680mj/cm
2~ 3400mj/cm
2ultraviolet light irradiate, light irradiation time is 5-7min.Adopt UV photo-irradiation treatment the pollutant such as residue, greasy dirt, release agent of plastic casing and middle membrane surface thoroughly can be removed, guarantee that the surface cleanliness of plastic casing and middle diaphragm is high, processing effect is good.
Wherein, the oxygen of described inorganic agent to be percent by volume be 5%-7% and percent by volume are the mist of the argon gas of 93%-95%.Oxygen can chemically ablation organic substance, and argon gas is heavier ion, chemical property torpescence, therefore do not react with the material of plastic casing or middle diaphragm, argon gas carries out collision to carry out surface cleaning processing with physical method and pollutant, chemistry combines with physical method, greatly improves the significant degree of effects on surface cleaning.
Wherein, described middle diaphragm is the mixture of the one or more than one in FPC, PEN, PEEK, PU, PET.Preferably, the composite material of middle diaphragm to be FPC and PEN with mass ratio be 1:1 processes, and FPC forms primarily of polyimides, polyimide high temperature-resistant, and bending performance is good, good rigidly; The strand rigidity of PEN is large, and structure be plane, has following excellent performance: intensity is high, dimensional stability and Heat stability is good, chemical resistance and hydrolytic resistance strong etc., PEN and FPC combines and can provide better vibrating membrane rigidity, and lastingly, transient state is good for tonequality.
Wherein, described plastic casing is the mixture of the one or more than one in PC, PEI, PI, LCP, PPS, PAR.Preferably, the composite material of plastic casing to be PC and PEI with mass ratio be 1.5:1-2, PC has high strength and high impact, fatigue durability is good, be combined with the PEI with high strength, high-modulus and superior thermal stability, play the characteristic of high strength fully, the plastic casing longer service life made, better with the forming stability of liquid-state silicon gel.
A kind of horn vibration film, processes obtained horn vibration film by the moulding process of described horn vibration film.Particularly, horn vibration film of the present invention, comprise plastic casing, middle diaphragm and the liquid-state silicon glue-line by liquid-state silicon gel injection forming, liquid-state silicon glue-line is hollow structure, the inward flange of described liquid-state silicon glue-line is connected with the outward flange of described middle diaphragm, and the outward flange of described liquid-state silicon glue-line is connected with the inward flange of described plastic casing.
Wherein, the Young's modulus of described horn vibration film is 6000-6800N/mm
2, density is 1.0-1.7g/cm
3, glass transition temperature is 110-150 DEG C, and relative damping is 0.4-0.85, and percentage elongation is 230-630%, and hot strength is 6-10MPa, and tearing toughness is 25-45kN/m.
Preferably, the Young's modulus of described horn vibration film is 6200-6600N/ (mm
2), density is 1.1-1.5g/ (cm
3), glass transition temperature is 120-140 DEG C, and relative damping is 0.5-0.8, and percentage elongation is 300%-500%, and hot strength is 7-9MPa, and tearing toughness is 29-40kN/m.
Beneficial effect of the present invention:
(1) the invention provides a kind of moulding process of horn vibration film, owing to just liquid-state silicon gel being expelled in mould before the forming, make liquid-state silicon gel not need manually to put, can encapsulate be realized shaping, therefore, greatly reduce production process, thus reduce production difficulty, improve production efficiency and reduce production cost, there is preparation technology simple, strong operability, and the advantage that can be applicable to large-scale production.
(2) the present invention uses liquid-state silicon gel curing molding together with glue material, can improve elasticity and the toughness of prepared liquid-state silicon gel, thus improves useful life, and the horn vibration film average life span that the present invention obtains is 3 years, than many 2 years of useful life of conventional film.
(3) area that the present invention uses liquid-state silicon gel to solidify is not traditional double-clad, and the region just between plastic casing inner chamber and middle diaphragm, greatly reduces raw materials for production, saves cost.
(4) moulding process of a kind of vibrating membrane provided by the invention, due to first at mold-in injection liquid-state silicon gel, then through overmolding, make the elasticity of prepared liquid-state silicon gel vibrating diaphragm and toughness very good, percentage elongation is 230% ~ 630%, and hot strength is 7MPa ~ 10MPa; Tearing toughness is 29 ~ 40.
(5) liquid-state silicon gel being 40 ~ 80 degree due to use hardness is used for mold-in injection, and the liquid-state silicon gel of this hardness range can improve elasticity and the toughness of the coated sheath of prepared liquid-state silicon gel further, and the tonequality of obtained vibrating membrane is good, and audio frequency can reach 570HZ.
(6) due to liquid-state silicon gel, to have product silica gel thickness even, material has high resiliency, the characteristic of high tear, high tensile, the horn vibration film that the present invention is obtained can have the quality such as good transient state, sensitivity, frequency response, has the advantages such as the good tonequality of lasting maintenance.
Embodiment
The invention will be further described with the following Examples.
Embodiment 1
The moulding process of a kind of horn vibration film of the present embodiment, comprises the following steps:
Step (A): carry out surface treatment to plastic casing and middle diaphragm, removes impurity;
Step (B): the plastic casing after surface treatment and middle diaphragm are positioned in the rear mold of injection mold, then with the sealed front mould of certain pressure, after front mould and rear mold matched moulds, utilize extrusion die to extrude respectively to the lateral surface of mould, the mold-in injection then toward injection mold enters liquid-state silicon gel;
Step (C): by the liquid-state silicon gel sulfidization molding after injection moulding, i.e. obtained horn vibration film.
Wherein, vulcanizing agent is N, N '-penylene bismaleimides and xanthic acid be the mixture of 2:0.4 by weight; Wherein, the temperature of sulfidization molding is 80 ° of C; Wherein, the pressure of sealed front mould and rear mold is 10bar; Wherein, the pressure of injection place viscose glue is 10bar.
The horn vibration film Young's modulus that the present embodiment obtains is 6000N/ (mm
2), density is 1.0g/ (cm
3), glass transition temperature is 110 DEG C, and relative damping is 0.4, and percentage elongation is 630%, and hot strength is 10MPa, and tearing toughness is 45N/m.
Embodiment 2
The difference of the present embodiment and embodiment 1 is: the vulcanizing agent of the present embodiment is N, N '-penylene bismaleimides and xanthic acid be the mixture of 3-0.35 by weight; Wherein, the temperature of sulfidization molding is 90 ° of C; Wherein, the pressure of sealed front mould and rear mold is 15bar; Wherein, the pressure of injection place viscose glue is 20bar.
The horn vibration film Young's modulus that the present embodiment obtains is 6150N/ (mm
2), density is 1.1g/ (cm
3), glass transition temperature is 115 DEG C, and relative damping is 0.55, and percentage elongation is 580%, and hot strength is 9MPa, and tearing toughness is 43kN/m.
All the other contents of the present embodiment are identical with embodiment 1, repeat no more here.
Embodiment 3
The difference of the present embodiment and embodiment 1 is: the vulcanizing agent of the present embodiment is N, N '-penylene bismaleimides and xanthic acid be the mixture of 4-0.3 by weight; Wherein, the temperature of sulfidization molding is 100 ° of C; Wherein, the pressure of sealed front mould and rear mold is 50bar; Wherein, the pressure of injection place viscose glue is 40bar.
The horn vibration film Young's modulus that the present embodiment obtains is 6300N/ (mm
2), density is 1.2g/ (cm
3), glass transition temperature is 120 DEG C, and relative damping is 0.6, and percentage elongation is 520%, and hot strength is 8.5MPa, and tearing toughness is 40kN/m.
All the other contents of the present embodiment are identical with embodiment 1, repeat no more here.
Embodiment 4
The difference of the present embodiment and embodiment 1 is: the vulcanizing agent of the present embodiment is N, N '-penylene bismaleimides and xanthic acid be the mixture of 5-0.25 by weight; Wherein, the temperature of sulfidization molding is 110 ° of C; Wherein, the pressure of sealed front mould and rear mold is 60bar; Wherein, the pressure of injection place viscose glue is 50bar.
The horn vibration film Young's modulus that the present embodiment obtains is 6400N/ (mm
2), density is 1.35g/ (cm
3), glass transition temperature is 130 DEG C, and relative damping is 0.625, and percentage elongation is 430%, and hot strength is 8MPa, and tearing toughness is 35kN/m.
All the other contents of the present embodiment are identical with embodiment 1, repeat no more here.
Embodiment 5
The difference of the present embodiment and embodiment 1 is: also include cementing operation between step described in the present embodiment (A) and step (B), is coated with one deck glue material layer respectively in the outside of the inner side of plastic casing and middle diaphragm.
Wherein, vulcanizing agent is N, N '-penylene bismaleimides and xanthic acid be the mixture of 6-0.15 by weight; Wherein, the temperature of sulfidization molding is 120 ° of C; Wherein, the pressure of sealed front mould and rear mold is 100bar; Wherein, the pressure of injection place viscose glue is 70bar.
The horn vibration film Young's modulus that the present embodiment obtains is 6600N/ (mm
2), density is 1.4g/ (cm
3), glass transition temperature is 140 DEG C, and relative damping is 0.6, and percentage elongation is 330%, and hot strength is 7MPa, and tearing toughness is 32kN/m.
All the other contents of the present embodiment are identical with embodiment 1, repeat no more here.
Embodiment 6
The difference of the present embodiment and embodiment 5 is: the vulcanizing agent of the present embodiment is N, N '-penylene bismaleimides and xanthic acid be the mixture of 6.5-0.1 by weight; Wherein, the temperature of sulfidization molding is 130 ° of C; Wherein, the pressure of sealed front mould and rear mold is 120bar; Wherein, the pressure of injection place viscose glue is 90bar.
The horn vibration film Young's modulus that the present embodiment obtains is 6700N/ (mm
2), density is 1.6g/ (cm
3), glass transition temperature is 145 DEG C, and relative damping is 0.7, and percentage elongation is 280%, and hot strength is 6.5MPa, and tearing toughness is 29kN/m.
All the other contents of the present embodiment are identical with embodiment 5, repeat no more here.
Embodiment 7
The difference of the present embodiment and embodiment 1 is: the vulcanizing agent of the present embodiment is N, N '-penylene bismaleimides and xanthic acid be the mixture of 7-0.1 by weight; Wherein, the temperature of sulfidization molding is 140 ° of C; Wherein, the pressure of sealed front mould and rear mold is 130bar; Wherein, the pressure of injection place viscose glue is 110bar.
The horn vibration film Young's modulus that the present embodiment obtains is 6800N/ (mm
2), density is 1.7g/ (cm
3), glass transition temperature is 150 DEG C, and relative damping is 0.85, and percentage elongation is 230%, and hot strength is 6MPa, and tearing toughness is 25kN/m.
All the other contents of the present embodiment are identical with embodiment 5, repeat no more here.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although done to explain to the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (10)
1. a moulding process for horn vibration film, is characterized in that: comprise the following steps:
Step (A): carry out surface treatment to plastic casing and middle diaphragm, removes impurity;
Step (B): the plastic casing after surface treatment and middle diaphragm are positioned in the rear mold of injection mold, then with the sealed front mould of certain pressure, after front mould and rear mold matched moulds, utilize extrusion die to extrude respectively to the lateral surface of mould, the mold-in injection then toward injection mold enters liquid-state silicon gel;
Step (C): by the liquid-state silicon gel sulfidization molding after injection moulding, i.e. obtained horn vibration film;
Wherein, the temperature of sulfidization molding is 80-140 DEG C;
Wherein, the pressure of sealed front mould and rear mold is 10-130bar.
2. the moulding process of a kind of horn vibration film according to claim 1, it is characterized in that: between described step (A) and step (B), also include cementing operation, be coated with one deck glue material layer respectively in the outside of the inner side of plastic casing and middle diaphragm.
3. the moulding process of a kind of horn vibration film according to claim 1, is characterized in that: described step (B) enters liquid-state silicon gel, wherein amount of silica gel >=90% of liquid-state silicon gel toward the mold-in injection of injection mold, and the hardness of liquid-state silicon gel is 40-80 degree.
4. the moulding process of a kind of horn vibration film according to claim 3, is characterized in that: the pressure of described injection liquid silica gel is 10-110bar; The injection moulding thickness of liquid-state silicon gel is 0.1-0.12mm.
5. the moulding process of a kind of horn vibration film according to claim 1, is characterized in that: described surface treatment is UV photo-irradiation treatment or inorganic agent process.
6. the moulding process of a kind of horn vibration film according to claim 5, is characterized in that: described UV photo-irradiation treatment comprises gumming, corona, oiling, glazing and cooling step successively.
7. the moulding process of a kind of horn vibration film according to claim 5, is characterized in that: the oxygen of described inorganic agent to be percent by volume be 5%-7% and percent by volume are the mist of the argon gas of 93%-95%.
8. the moulding process of a kind of horn vibration film according to claim 1, is characterized in that: described middle diaphragm is the mixture of the one or more than one in FPC, PEN, PEEK, PU, PET; Described plastic casing is the mixture of the one or more than one in PC, PEI, PI, LCP, PPS, PAR.
9. a horn vibration film, is characterized in that: process obtained horn vibration film by the moulding process of the horn vibration film described in claim 1-8 any one.
10. a kind of horn vibration film according to claim 9, is characterized in that: the Young's modulus of described horn vibration film is 6000-6800N/mm
2, density is 1.0-1.7g/cm
3, glass transition temperature is 110-150 DEG C, and relative damping is 0.4-0.85, and percentage elongation is 230-630%, and hot strength is 6-10MPa, and tearing toughness is 25-45kN/m.
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| CN110446152A (en) * | 2018-05-03 | 2019-11-12 | 陈元森 | Reduce the horn vibration piece making method of elastic properties of materials |
| CN115134721A (en) * | 2022-06-30 | 2022-09-30 | 歌尔股份有限公司 | Ball top and preparation method thereof, vibrating diaphragm assembly, sound production device and electronic equipment |
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|---|---|
| CN105554676B (en) | 2019-04-23 |
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Address after: Liao Bu Zhen Heng Keng Guan Zhang Road community section 523000 in Guangdong province Dongguan City Hengkeng No. 218 Applicant after: Guangdong Fang Zhenxin materials precision Components Ltd Address before: 523300 Guangdong Province, Dongguan City Shek Pai Zhen Heng Shan Cun Fang Dongguan city based Industrial Park vibration plastic electronic products Co. Applicant before: Dongguan Forbetter Plastic & Electronic Products Co., Ltd. |
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