201201595 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種發聲裝置，尤其涉及一種應用合金殼體 的發聲裝置。 [0002] [先前技術] 隨著新技術和新材料的不斷發展，人們對視聽品質的要 求也越來越高。發聲裝置，如耳機、音響，產品層出不 窮，然而，先前技術中對發聲裝音質的改進多著重於其 〇 内置揚聲器的改進，對殼體改進則敕少。但殼體對音質 的回應同樣很大，直接影響揚聲誥的敎果。 [0003] 以耳機為例，其殼體多由於共振及混響對揚聲器及整個 耳機的發聲效果造成影響，先前技術中的耳機殼體為塑 膠或樹脂，造成耳機發聲的混響較長，殼體的共振較強 ，發聲效果不夠清晰，使耳機存在音質不好的問題。另外 ，塑膠或樹脂的殼體耐用性不好，容易變形，並且不夠 輕巧。 ❹ [0004] 【發明内容】 -種發聲裝置’其包括：殼體；以及揚聲器，該揚聲器 設置於該殼體内部；該殼體的材料為鎂基複合材料該 減複合材料包括鎂基金屬和分散在該鎮基金屬中的奈 米增強相，該奈米增強相在鎮基複合材料中的質量百分 含量為0.5%至2%。 [0005] 相較於先前技術，本技财案採㈣基複合材料作為發 聲裝置的殼體’可以減少毅體產生的混響及共振，使發 聲效果清晰，從而提高發聲裝置的音質。並且，鎮基複 099120740 表單編號A〇101 第3頁/共26頁 0992036591-0 201201595 合材料的殼體比塑膠殼體更為堅固耐用，由於該殼體具 有較好的強度，在滿足強度需要的前提下，可採用較小 的壁厚，從而減輕發聲裝置的總體質量，並使發聲裝置 内部空間增大。 【實施方式】 [0006] 以下將結合附圖詳細說明本技術方案實施例的發聲裝置 〇 [0007] 本技術方案提供一種發聲裝置，該發聲裝置包括中空的 殼體以及設置於殼體内部的揚聲器。該發聲裝置可以為 耳機、音響、喇队、手機、筆記本電腦或電視。 [0008] 請參閱圖1，本技術方案實施方式以耳機10為例，該耳機 10包括中空的耳機殼體以及設置於殼體内部的揚聲器14 。該耳機10可以為頭戴式、耳掛式、入耳式或耳塞式等 結構。 [0009] 該揚聲器14可以為電動式、電容式、靜電式、氣動式及 壓電式等類型。該揚聲器14用於將電信號轉換成聲音信 號。具體地，揚聲器14可將一定範圍内的音頻電功率信 號通過換能方式轉變為失真小並具有足夠聲壓級的可聽 聲音。本實施例中，該揚聲器14為電動式揚聲器14。 [0010] 該殼體的壁厚為0. 01毫米至2毫米。該殼體可包括面對使 用者的前部12及連接導線的後部16，該前部12可進一步 包括多個出聲孔。本實施例中，該耳機為耳塞式，前部 12為具有出聲孔的圓片蓋體，後部16為與圓片蓋體扣合 的碗形基座。 099120740 表單編號A0101 第4頁/共26頁 0992036591-0 201201595 [0011] ο201201595 VI. Description of the Invention: [Technical Field] The present invention relates to a sounding device, and more particularly to a sounding device using an alloy casing. [0002] [Prior Art] With the continuous development of new technologies and new materials, people's requirements for audio-visual quality are also increasing. Sounding devices, such as earphones and stereos, are inexhaustible. However, the improvement in sound quality of the sounding in the prior art has focused more on the improvement of the built-in speaker, and the improvement in the casing is reduced. However, the shell responds equally to sound quality, directly affecting the consequences of the sound. [0003] Taking the earphone as an example, the housing of the earphone has a influence on the sounding effect of the speaker and the whole earphone due to resonance and reverberation. The earphone housing in the prior art is plastic or resin, which causes the reverberation of the earphone to sound longer. The resonance of the housing is strong, and the sounding effect is not clear enough, so that the earphone has a problem of poor sound quality. In addition, plastic or resin housings are not durable, easily deformed, and not lightweight enough. [0004] [A Summary of the Invention] - A sounding device 'includes: a housing; and a speaker disposed inside the housing; the material of the housing is a magnesium-based composite material, the subtractive composite material comprises a magnesium-based metal and A nano-reinforced phase dispersed in the base metal of the town, the nano-reinforcing phase having a mass percentage of 0.5% to 2% in the base-based composite. [0005] Compared with the prior art, the present invention uses the (four)-based composite material as the housing of the sound-emitting device to reduce the reverberation and resonance generated by the body, and to make the sound effect clear, thereby improving the sound quality of the sound-emitting device. And, the town base complex 099120740 Form No. A〇101 Page 3 / Total 26 Page 0992036591-0 201201595 The material of the composite shell is more durable than the plastic shell, because the shell has better strength, in order to meet the strength needs On the premise, a smaller wall thickness can be used, thereby reducing the overall quality of the sounding device and increasing the internal space of the sounding device. [0006] Hereinafter, a sound emitting device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. [0007] The present technical solution provides a sound emitting device including a hollow casing and a speaker disposed inside the casing. . The sounding device can be a headset, an audio, a racquet, a cell phone, a laptop or a television. Referring to FIG. 1 , the embodiment of the present invention takes the earphone 10 as an example. The earphone 10 includes a hollow earphone housing and a speaker 14 disposed inside the casing. The earphone 10 can be of a head-mounted, ear-hook type, in-ear type or earbud type. [0009] The speaker 14 can be of the electric, capacitive, electrostatic, pneumatic, and piezoelectric type. The speaker 14 is used to convert an electrical signal into a sound signal. In particular, the speaker 14 can convert a range of audio electric power signals into a audible sound that is small in distortion and has a sufficient sound pressure level. In the present embodiment, the speaker 14 is an electric speaker 14. 01毫米至两毫米。 [0010] The wall thickness of the housing is 0. 01 mm to 2 mm. The housing can include a front portion 12 facing the user and a rear portion 16 connecting the wires, the front portion 12 can further include a plurality of sound holes. In this embodiment, the earphone is of the earbud type, the front portion 12 is a wafer cover body having a sound hole, and the rear portion 16 is a bowl-shaped base that is engaged with the wafer cover body. 099120740 Form No. A0101 Page 4 of 26 0992036591-0 201201595 [0011]
G 該殼體的前部12和後部16中至少—個部分由鎂基複合材 料製成。本實施例t，該殼體整體由鎂基複合材料製成 ，即圓片蓋體與碗形基座的材料料鎂基複合材料。該 儀基複合材料包括鎂基金屬和分散在該镁基金屬中的奈 米增強相。該奈米增強相可以為奈米碳管、碳化矽奈： 顆粒 '氧化IS奈米顆粒、碳化銥奈米顆粒、碳化蝴奈米 顆粒、石墨奈米顆粒或其混合，優選為奈米碳管或碳化 矽奈米顆粒。該奈米碳管可以為單壁奈米碳管、雙壁奈 米碳管及多壁奈米碳管中的-種或多種。所述單壁奈米 碳管的直徑為0. 5奈米〜50奈米，辦逮雙壁奈米碳管的直 徑為1.0奈米〜50奈米，所述多壁奈米碳管的直徑為15 奈米〜50奈米。該奈米增強相在鎂基複合材料中的質量百 分含量約為〇.〇1%至10%，優選為〇5%至29^該奈米增強 相的形狀可以為粉末、纖維或晶須。該奈米增強相的尺 寸（即粉末、纖維或晶須的直徑）約為丨奈米至1〇〇奈米 ，優選為30奈米至50奈米。該鎂基金屬為鉍鎂或鎂合金 。該鎂合金的組成元素徐鎂外，還包括鋅、錳、鋁、锆 、钍、鋰、銀、鈣等合金元素的一種或多種，其中鎂佔 鎂合金質量百分比80%以上，其他金屬元素的總合佔鎂合 金質量百分比20%以下。該鎂合金的型號可以為AZ91、 AM60、AS41、AS21、AE42，優選為AZ91。 [0012] 該奈米增強相的加入有利於鎂基金屬晶粒的細化，能夠 提咼該殼體的抗拉強度（tensile strength)及伸長 率（elongation)。本實施例中，該鎂基金屬採用 AZ91D型號的鎂合金，該奈米增強相採用奈米碳管或碳化 099120740 表單編號A0101 第5頁/共26頁 0992036591-0 201201595 矽奈米顆粒。請參閱圖2至圖5，將具有質量百分比為 0. 5%，1 %及1. 5%的奈米增強相的鎂基複合材料與純 AZ91D鎂合金進行晶粒對比，發現隨著奈米增強相質量百 分比在0. 5%至1. 5%範圍内逐漸提高，該鎂基複合材料的 晶粒明顯減小。所述該鎂基複合材料的晶粒比用於製造 該鎂基複合材料的鎂基金屬的晶粒減小60%至75%。該鎂 基複合材料的晶粒約為100微米至150微米。本實施例中 ，當該鎂基複合材料的奈米增強相為質量百分比為0. 5°/〇 至2%的奈米碳管時，該鎂基複合材料的晶粒可以比AZ91D 鎂合金的晶粒減小60%至75%。請參閱圖6，當該鎂基複合 材料的奈米增強相為質量百分比為0. 5%至2%的碳化矽時 ’镇晶粒與破_化碎晶粒之間的介面清晰’不存在介面間 反應的中間相。請參閱圖7，將奈米增強相為不同質量百 分含量的奈米碳管的鎂基複合材料進行抗拉強度測試， 發現當奈米碳管佔鎂基複合材料質量百分比為1. 5%時， 該鎂基複合材料具有較好的抗拉強度。 [0013] 請參閱圖8,將奈米增強相為不同質量百分含量的奈米碳 管的鎂基複合材料進行伸長率測試，發現當奈米碳管佔 鎂基複合材料質量百分比為1. 5%時，該鎂基複合材料具 有較好的伸長率。上述測試表明，通過在鎂基金屬中加 入奈米增強相，有效地細化了晶粒，提高了鎂基複合材 料的抗拉強度及伸長率，有利於該耳機殼體的製造，並 有利於提高該耳機殼體的強度和耐用性，具體試驗資料 請參閱表1。 [0014] 表1抗拉強度及伸長率測試資料表 099120740 表單編號Α0101 第6頁/共26頁 0992036591-0 201201595 [0015] 奈米碳 管質量 百分含 量 0°/〇 0. 01% 0.5% 1% 1.5% 2% 抗拉強 度 (MPa) 86 86. 5 89 96 104 90 伸長率 (%) 0. 92 0.93 1. 1 1.26 1. 28 0.67G At least one of the front portion 12 and the rear portion 16 of the housing is made of a magnesium-based composite material. In the embodiment t, the housing is entirely made of a magnesium-based composite material, that is, a material-based magnesium-based composite material of the wafer cover body and the bowl-shaped base. The instrument-based composite material includes a magnesium-based metal and a nano-reinforced phase dispersed in the magnesium-based metal. The nano reinforcing phase may be a carbon nanotube, a strontium carbide: a particle oxidized IS nanoparticle, a strontium carbide nanoparticle, a carbonized wafer nanoparticle, a graphite nanoparticle or a mixture thereof, preferably a carbon nanotube Or carbonized nano particles. The carbon nanotubes may be one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. The diameter of the single-walled carbon nanotube is 0.5 nm to 50 nm, and the diameter of the double-walled carbon nanotube is 1.0 nm to 50 nm, and the diameter of the multi-walled carbon nanotube is For 15 nm ~ 50 nm. The nano-reinforced phase has a mass percentage of about %.〇1% to 10%, preferably 〇5% to 29% in the magnesium-based composite material. The shape of the nano-reinforced phase may be powder, fiber or whisker. . The size of the nano-enhanced phase (i.e., the diameter of the powder, fiber or whisker) is from about 丨 nanometer to about 1 nanometer, preferably from 30 nanometers to 50 nanometers. The magnesium-based metal is bismuth magnesium or a magnesium alloy. The magnesium alloy is composed of one or more alloying elements such as zinc, manganese, aluminum, zirconium, hafnium, lithium, silver, calcium, etc., wherein magnesium accounts for more than 80% by mass of the magnesium alloy, and other metal elements The total amount of magnesium alloy is less than 20% by mass. The type of the magnesium alloy may be AZ91, AM60, AS41, AS21, AE42, preferably AZ91. [0012] The addition of the nano reinforcing phase facilitates the refinement of the magnesium-based metal grains and enhances the tensile strength and elongation of the shell. In this embodiment, the magnesium-based metal is a magnesium alloy of the AZ91D type, and the nano-reinforced phase is made of carbon nanotubes or carbonized. 099120740 Form No. A0101 Page 5 of 26 0992036591-0 201201595 矽 Nanoparticles. Referring to FIG. 2 to FIG. 5, the magnesium-based composite material having a mass percentage of 0.5%, 1%, and 1.5% of the nano-reinforced phase is compared with the pure AZ91D magnesium alloy, and found along with the nanometer. The percentage of the reinforcing phase is gradually increased in the range of 0.5% to 1.5%, and the grain size of the magnesium-based composite material is remarkably reduced. The grain of the magnesium-based composite material is reduced by 60% to 75% compared to the grain of the magnesium-based metal used to make the magnesium-based composite material. The magnesium matrix composite has a grain size of from about 100 microns to about 150 microns. In this embodiment, when the nano-reinforced phase of the magnesium-based composite material is a carbon nanotube having a mass percentage of 0.5 to 2 to 2%, the grain of the magnesium-based composite material may be more than that of the AZ91D magnesium alloy. The grain size is reduced by 60% to 75%. Referring to FIG. 6 , when the nano-reinforced phase of the magnesium-based composite material is 0.5% to 2% by mass of lanthanum carbide, the interface between the town grains and the broken grains is clear. The intermediate phase of the interaction between the interfaces. 5%。 The mass ratio of the nano-carbon nanotubes to the magnesium-based composite material is 1.5%. The magnesium-based composite material has good tensile strength. [0013] Referring to FIG. 8 , the elongation test of the magnesium-based composite material with different nanometers of carbon nanotubes in the nano-reinforced phase was carried out, and it was found that the mass percentage of the carbon-based composite material was 1. At 5%, the magnesium-based composite material has a good elongation. The above test shows that by adding a nano reinforcing phase to the magnesium-based metal, the crystal grains are effectively refined, and the tensile strength and elongation of the magnesium-based composite material are improved, which is advantageous for the manufacture of the earphone housing and is advantageous. To improve the strength and durability of the earphone housing, please refer to Table 1 for specific test data. [0014] Table 1 tensile strength and elongation test data sheet 099120740 Form No. 101 0101 Page 6 / Total 26 Page 0992036591-0 201201595 [0015] Nano carbon tube mass percentage 0 ° / 〇 0. 01% 0.5% 1% 1.5% 2% Tensile strength (MPa) 86 86. 5 89 96 104 90 Elongation (%) 0. 92 0.93 1. 1 1.26 1. 28 0.67
該殼體的製造方法可以為觸變成形、壓鑄成形、粉末冶 金或機械加工成形等。具體地，可將所述奈米增強相的 粉末、纖維或晶須加入熔融的鎂基金屬中，並通過觸變 成形或壓鑄成形的方法得到耳機殼體，或者可以將鎂基 金屬的粉末與奈米增強相進行混合，並通過粉末冶金的 方法製備耳機殼體，另外，也可以將所述鎂基複合材料 預先形成坯體，並通過機械加工的方式形成耳機殼體。 [0016] 在本實施例中，該鎂基複合材料的製備方法包括以下步 驟： [0017] 首先，提供鎂基金屬及奈米增強相； [0018] 其次，將奈米增強相在460°C至580°C下加入熔融的鎂基 金屬進行混合形成混合物； [0019] 再次，在620°C至650°C下對該混合物進行超聲波處理使 奈米增強相均勻分散在鎂基金屬中；以及 [0020] 最後，將該混合物在650°C至680°C下進行澆鑄，形成鎂 099120740 表單編號A0101 第7頁/共26頁 0992036591-0 201201595 基複合材料述體。 [0021] 在上述混合、超聲波處理及澆鑄過程中的温度分三個階 段逐漸升高，有利於使鎂基複合材料中的晶粒細化，並 且，上述過程均在保護氣體中進行，以防止鎂基金屬被 氧化。所述保護氣體可選自惰性氣體和氮氣中的一種或 多種，本實施例中保護氣體優選為為氮氣。 [0022] 具體地，該鎂基金屬可以為AZ91D鎂合金，該奈米增強相 可以為奈米碳管或碳化矽。該熔融的鎂基金屬可設置於 一内部充滿保護氣體的容器中。在將奈米增強相加入該 熔融的鎂基金屬的過程中可進一步通過攪#器不斷對容 器中的混合物進行機械攪拌，使奈米增強相和該熔融的 鎮基金屬初步混合，得到一混合漿料。 [0023] 該超聲波處理的過程可以為將混合物連同容器置於一高 能量超聲波震盪攪拌裝置中，在一定頻率的超聲波下震 盪一段時間後，得到一均勻混合漿料。所述超聲波的頻 率為15千赫茲至20千赫茲，本實施例中超聲波的頻率優 選為15千赫茲。所述超聲波處理的時間為5分鐘至40分鐘 ，優選為30分鐘。本技術方案所採用超聲震盪的超聲波 頻率選擇為15-20千赫茲，相對於一般超聲波頻率48千赫 茲而言，本技術方案所採用的超聲波的頻率較低，而此 超聲震盪裝置為一高能量超聲震盪攪拌裝置，因此該超 聲震盪裝置的振幅較大，因此可以使輕金屬熔湯中的輕 金屬微粒發生劇烈運動，從而可以使奈米級顆粒增強體 在輕金屬炼湯中均勻分配，得到一均勻混合漿料。 099120740 表單編號A0101 第8頁/共26頁 0992036591-0 201201595 [酬錢鑄_財麵合Μ錢鑄至-模具巾冷卻固化 γ成忒鎂基複合材料坯體。進一步地，可通過一擠壓 、1處理過知處理該鎂基複合材料坯體。通過該擠壓成 型處理過裎’該奈米增強相在魏合物巾經再次分配， 刀散更加均勻’可進—步提高該鎮基複合材料的強度和 韌性。 [0025] 該述體可進一步诵沾厥拉^ Λ、Λ| 乂通過愚鑄成型’得到該耳機殼體。將奈 米碳管作為奈米増強相，AZ91D鎮合金作為鎮基金層，且 該奈米增強相的質量百分含量為i· 5%，通過壓鑄成形法 氣備成體。清參閱表2 ,該鑲基複合材料製成的殼體與塑 膠殼體及AZ91D鎂合金殼體相比，具有較好的屈服強度， 且雄、度比AZ91D鎂合金有所降低。 [0026] 表2不同材料殼體性能對比 [0027] 參數 ------- 塑膠 (PC+ABS) AZ91D鎮合金 鎂基複合材料 密度 (g/cm3) 1.07 1. 82 1. 80 ~ 屈服強度 (MPa) 39 --, —-- 230 —-—------- 276 ❹ 099120740 在採用相同形狀殼體的條件下，對採用 的殼體的耳機進行聲學测試，並與AZ91D鎂合金殼體；、 機及塑膠殼體的耳機進行對比發現，採用該鎂基複人=耳 料的殼體制成的耳機與採用AZ91D鎂合金殼體的 用塑谬殼體的耳機具有基本—致的頻率回應曲線及 曲線。然而’請㈣圖9，制顧基複合㈣ : 表單編號A0101 第9頁/共26頁 ^ 0992036591-0 201201595 成的耳機在三種測試的耳機中具有最小的總諧波失真。 在20赫茲至50赫茲頻率範圍内，採用鎂基複合材料的殼 體的耳機的總諧波失真比AZ91D鎂合金殼體的耳機減少約 10% ° [0028] 請參閱圖10至12，從採用不同材料的殼體的瀑布分析圖 中可以看出，在20赫茲至30赫茲範圍，採用鎂基複合材 料殼體的耳機音頻振幅最低，從而使這種耳機的總諧波 失真最小，而在100赫茲至600赫茲範圍，採用鎂基複合 材料殼體的耳機比其他兩種耳機波形均一，可知這種耳 機具有發聲效果清晰的特點。 [0029] 本技術方案採用鎂基複合材料作為耳機的殼體，可以縮 短耳機發聲的混響，減少耳機殼體共振，使發聲效果清 晰，從而提高耳機的音質。並且，鎂基複合材料的殼體 比塑膠殼體更為堅固耐用，由於該殼體具有較好的強度 ，在滿足強度需要的前提下，可採用較小的壁厚，從而 減輕耳機的總體質量，並使耳機内部空間增大。另外， 鎂基複合材料具有良好的導熱性，利於耳機散熱。 [0030] 本領域技術人員可以理解，本技術方案雖然以耳機作為 具體實施例進行說明，然而由於所述殼體因製造殼體的 材料本身具有上述優點，因此具有所述殼體的其他發聲 裝置也能具有發聲效果較好，質量較輕，堅固耐用且易 於散熱的優點。 [0031] 综上所述，本發明確已符合發明專利之要件，遂依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施例 099120740 表單編號A0101 第10頁/共26頁 0992036591-0 201201595 ，自不能以此限制本案之申請專利範圍。舉凡習知本案 技藝之人士援依本發明之精神所作之等效修飾或變化， 皆應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 [0032] 圖1為本技術方案實施例耳機的結構示意圖。 [0033] 圖2為AZ91D鎂合金50倍光學顯微鏡照片。 [0034] 圖3為具有質量百分比為0. 5 %的奈米增強相的鎂基複合材 料50倍光學顯微鏡照片。 [0035] 圖4為具有質量百分比為1%的奈米增強相的鎂基複合材料 50倍光學顯微鏡照片。 [0036] 圖5為具有質量百分比為1. 5%的奈米增強相的鎂基複合材 料50倍光學顯微鏡照片。 [0037] 圖6為鎂基複合材料中碳化矽與鎂晶粒介面的高解析度透 射電鏡照片。 [0038] 圖7為具有不同質量百分含量的奈米增強相的鎂基複合材 料抗拉強度的測試資料圖。 [0039] 圖8為具有不同質量百分含量的奈米增強相的鎂基複合材 料伸長率的測試資料圖。 [0040] 圖9為具有不同材料的耳機殼體的耳機的總諧波失真曲線 測試資料圖。 [0041] 圖10為具有塑膠耳機殼體的耳機的瀑布分析圖。 [0042] 圖11為具有AZ91D鎂合金耳機殼體的耳機的瀑布分析圖。 099120740 表單編號A0101 第11頁/共26頁 0992036591-0 201201595 [0043] 圖12為具有鎂基複合材料耳機殼體的耳機的瀑布分析圖 〇 【主要元件符號說明】 [0044] 耳機：10 [0045] 前部：12 [0046] 揚聲器：14 [0047] 後部：16 0992036591-0 099120740 表單編號A0101 第12頁/共26頁The method of manufacturing the casing may be thixoforming, die casting, powder metallurgy or mechanical forming. Specifically, the powder, fiber or whisker of the nano reinforcing phase may be added to the molten magnesium-based metal, and the earphone casing may be obtained by a thixoforming or die casting method, or the magnesium-based metal powder may be obtained. The earphone housing is prepared by a powder metallurgy method by mixing with the nano reinforcing phase. Alternatively, the magnesium-based composite material may be preformed into a blank body, and the earphone housing may be formed by mechanical processing. [0016] In the present embodiment, the method for preparing the magnesium-based composite material comprises the following steps: [0017] First, a magnesium-based metal and a nano-reinforcing phase are provided; [0018] Next, the nano-reinforced phase is at 460 ° C. Adding molten magnesium-based metal to 580 ° C to form a mixture; [0019] again, ultrasonically treating the mixture at 620 ° C to 650 ° C to uniformly disperse the nano reinforcing phase in the magnesium-based metal; [0020] Finally, the mixture is cast at 650 ° C to 680 ° C to form magnesium 099120740 Form No. A0101 Page 7 / Total 26 Page 0992036591-0 201201595 Base composite body. [0021] The temperature in the above mixing, ultrasonic treatment, and casting process is gradually increased in three stages, which is advantageous for grain refinement in the magnesium-based composite material, and the above processes are all performed in a protective gas to prevent The magnesium-based metal is oxidized. The shielding gas may be selected from one or more of an inert gas and nitrogen, and the shielding gas in this embodiment is preferably nitrogen. [0022] Specifically, the magnesium-based metal may be an AZ91D magnesium alloy, and the nano reinforcing phase may be a carbon nanotube or a tantalum carbide. The molten magnesium-based metal may be disposed in a container filled with a protective gas. In the process of adding the nano reinforcing phase to the molten magnesium-based metal, the mixture in the vessel may be further mechanically stirred by a stirrer to initially mix the nano reinforcing phase and the molten town-based metal to obtain a mixture. Slurry. [0023] The ultrasonic treatment may be performed by placing the mixture together with a container in a high-energy ultrasonic vibration stirring device, and shaking for a period of time under ultrasonic waves of a certain frequency to obtain a uniform mixed slurry. The frequency of the ultrasonic waves is from 15 kHz to 20 kHz, and the frequency of the ultrasonic waves in this embodiment is preferably 15 kHz. The time of the ultrasonic treatment is from 5 minutes to 40 minutes, preferably 30 minutes. The ultrasonic frequency of the ultrasonic vibration used in the technical solution is selected to be 15-20 kHz, and the frequency of the ultrasonic wave used in the technical solution is low compared to the general ultrasonic frequency of 48 kHz, and the ultrasonic oscillating device is a high energy. Ultrasonic vibration stirrer, so the amplitude of the ultrasonic oscillator is large, so that the light metal particles in the light metal melt can be vigorously moved, so that the nano-sized particle reinforcement can be evenly distributed in the light metal soup to obtain a uniform mixture. Slurry. 099120740 Form No. A0101 Page 8 of 26 0992036591-0 201201595 [Remuneration of money casting _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Further, the magnesium-based composite material body can be treated by a pressing, 1 treatment. By the extrusion molding process, the nano reinforcing phase is redistributed in the Wei compound towel, and the knife dispersion is more uniform, which can further improve the strength and toughness of the base matrix composite. [0025] The body of the present invention can further obtain the earphone housing by smashing, smashing, and smashing. The carbon nanotubes were used as the nano samarium phase, the AZ91D town alloy was used as the town fund layer, and the mass percentage of the nano reinforced phase was i·5%, which was prepared by die casting. Referring to Table 2, the shell made of the base composite has better yield strength than the plastic shell and the AZ91D magnesium alloy shell, and the male and the degree are lower than the AZ91D magnesium alloy. [0026] Table 2 performance comparison of different material shells [0027] Parameters ------- Plastic (PC + ABS) AZ91D town alloy magnesium matrix composite density (g / cm3) 1.07 1. 82 1. 80 ~ yielding Strength (MPa) 39 --, ---- 230 —--------- 276 ❹ 099120740 Under the condition of the same shape of the housing, the headphones of the housing used are acoustically tested, and with AZ91D The magnesium alloy casing; the machine and the plastic casing of the earphones were compared and found that the earphone made of the magnesium-based compound=ear material casing and the earphone with the plastic case of the AZ91D magnesium alloy casing have the basic— The frequency response curve and curve. However, please (4) Figure 9, Guji Composite (4): Form No. A0101 Page 9 of 26 ^ 0992036591-0 201201595 The earphones have the smallest total harmonic distortion in the three tested headphones. In the frequency range of 20 Hz to 50 Hz, the total harmonic distortion of the earphones of the housing using the magnesium-based composite material is reduced by about 10% compared to the earphones of the AZ91D magnesium alloy casing. [0028] Please refer to Figures 10 to 12, In the waterfall analysis of the shells of different materials, it can be seen that in the range of 20 Hz to 30 Hz, the headphone audio amplitude of the magnesium-based composite housing is the lowest, so that the total harmonic distortion of the earphone is minimized, and at 100 In the Hertz to 600 Hz range, the earphones with the magnesium-based composite casing are more uniform than the other two types of earphones, and it is known that the earphones have the characteristics of clear sounding effect. [0029] The technical solution adopts a magnesium-based composite material as a casing of the earphone, which can shorten the reverberation of the earphone sound, reduce the resonance of the earphone casing, and make the sounding effect clear, thereby improving the sound quality of the earphone. Moreover, the shell of the magnesium-based composite material is more durable and durable than the plastic shell. Since the shell has good strength, a small wall thickness can be adopted under the premise of meeting the strength requirement, thereby reducing the overall quality of the earphone. And increase the internal space of the headphones. In addition, the magnesium-based composite material has good thermal conductivity, which is advantageous for heat dissipation of the earphone. [0030] It will be understood by those skilled in the art that although the present invention is described with the earphone as a specific embodiment, since the housing has the above advantages due to the material of the manufacturing housing itself, other sounding devices having the housing are provided. It also has the advantages of better sounding effect, lighter weight, durability and easy heat dissipation. [0031] In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only the preferred embodiment of the present invention. 099120740 Form No. A0101 Page 10 of 26 0992036591-0 201201595, which cannot limit the scope of patent application in this case. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0032] FIG. 1 is a schematic structural view of an earphone according to an embodiment of the present technical solution. 2 is a 50x optical microscope photograph of the AZ91D magnesium alloy. 3 is a 50-fold optical micrograph of a magnesium-based composite material having a nanometer reinforcing phase of 0.5% by mass. [0034] FIG. 4 is a 50x optical micrograph of a magnesium-based composite material having a nano-weighted phase of 1% by mass. [0035] FIG. 5 is a 50-fold optical micrograph of a magnesium-based composite material having a nano-weighted phase of 1.5% by mass. [0036] FIG. 6 is a high-resolution transmission electron micrograph of a tantalum carbide and magnesium grain interface in a magnesium-based composite material. 7 is a test data diagram of the tensile strength of a magnesium-based composite material having different mass percentages of nano reinforcing phase. 8 is a test data diagram of elongation of a magnesium-based composite material having different mass percentages of nano-reinforced phase. [0039] FIG. [0040] FIG. 9 is a graph showing a total harmonic distortion curve test data of an earphone having earphone housings of different materials. [0041] FIG. 10 is a waterfall analysis diagram of an earphone with a plastic earphone housing. [0042] FIG. 11 is a waterfall analysis diagram of an earphone with an AZ91D magnesium alloy earphone housing. 099120740 Form No. A0101 Page 11 of 26 0992036591-0 201201595 [0043] Figure 12 is a waterfall analysis diagram of a headphone housing with a magnesium-based composite earphone [〇] [0044] Headphones: 10 [ 0045] Front: 12 [0046] Speaker: 14 [0047] Rear: 16 0992036591-0 099120740 Form No. A0101 Page 12 of 26