CN105706459A - 防水透声膜和电子设备 - Google Patents
防水透声膜和电子设备 Download PDFInfo
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- CN105706459A CN105706459A CN201480061107.5A CN201480061107A CN105706459A CN 105706459 A CN105706459 A CN 105706459A CN 201480061107 A CN201480061107 A CN 201480061107A CN 105706459 A CN105706459 A CN 105706459A
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Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
本发明提供一种防水透声膜(10),其用于在容许声音通过的同时防止水的进入。防水透声膜(10)具备具有聚四氟乙烯(PTFE)膜(20)的透声区域(11)。聚四氟乙烯膜(20)的根据ASTM F316-86测定的平均孔径为0.02μm以上且0.1μm以下、孔隙率为5%以上且25%以下。防水透声膜(10)可以适合用于容纳有声学装置的电子设备。
Description
技术领域
本发明涉及防水透声膜和电子设备。
背景技术
手机、笔记本电脑、电子记事本、数码照相机或游戏设备等电子设备具备声音功能。在具备声音功能的电子设备的壳体的内部配置有扬声器、蜂鸣器等声发射部、或麦克风等声接收部等。在典型的壳体上,设置有将声音引导至声发射部或声接收部的开口。
为了防止水滴等异物进入电子设备的壳体的内部,进行了用防水透声膜覆盖壳体的开口。作为防水透声膜,已知聚四氟乙烯(PTFE)多孔膜(参照专利文献1~3)。通过将包含聚四氟乙烯细粉和液体润滑剂的成形体拉伸并多孔化来制造作为防水透声膜使用的聚四氟乙烯多孔膜。
现有技术文献
专利文献
专利文献1:日本特开2003-53872号公报
专利文献2:日本特开2004-83811号公报
专利文献3:日本特表2003-503991号公报
发明内容
发明所要解决的课题
对于使防水透声膜的防水性提高的要求不断变高。若使用无孔的膜作为防水透声膜,则可以确保防水透声膜的防水性。但是,无孔的膜的透声性低。以不显著损害透声性而提高防水性的方式改良防水透声膜并不容易。
鉴于这样的情况,本发明的目的在于改良防水透声膜。
用于解决课题的手段
本发明提供一种防水透声膜,其用于在容许声音通过的同时防止水的进入,其中,
所述防水透声膜具备具有聚四氟乙烯膜的透声区域,
上述聚四氟乙烯膜的根据ASTMF316-86测定的平均孔径为0.02μm以上且0.1μm以下、孔隙率为5%以上且25%以下。
发明效果
本发明的防水透声膜中的聚四氟乙烯膜的平均孔径和孔隙率小,适合于提高防水性。另外,该聚四氟乙烯膜的平均孔径和孔隙率大于零,也适合于确保透声性。
附图说明
图1是表示本发明的防水透声膜的一例的剖视图。
图2是图1所示的防水透声膜的立体图。
图3是表示本发明的防水透声膜的另一例的剖视图。
图4是图3所示的防水透声膜的立体图。
图5是表示作为本发明的电子设备的例子的手机的前视图。
图6是图5所示的手机的后视图。
图7是声学特性的评价系统的制造方法的工序图。
图8是评价用样品的放大图。
图9是表示实施例和比较例中的评价用样品的声学特性的图。
图10是实施例中的聚四氟乙烯膜的表面的SEM(扫描型电子显微镜)图像。
图11是实施例中的聚四氟乙烯膜的表面的SEM图像。
具体实施方式
以下,边参照附图边对本发明的实施方式进行说明,但以下只不过是本发明的实施方式的例示,并不旨在限制本发明。
使用图1和图2,对本实施方式的防水透声膜进行说明。防水透声膜10具有透声区域11和围绕透声区域11的周边区域12。透声区域11容许声音通过。周边区域12可以用作安装于壳体的部分,例如焊接于壳体。
透声区域11和周边区域12具有聚四氟乙烯(PTFE)膜20。本实施方式中,透声区域11和周边区域12仅具有PTFE膜20。
PTFE膜20的表面20f和背面20b在透声区域11与外部空气接触。该方式适合于实现良好的透声性。需要说明的是,图1和图2所示的防水透声膜10中,PTFE膜20的表面20f和背面20b在周边区域12也与外部空气接触。
PTFE膜20为形成有相互独立的多个孔21的实心的膜。换言之,PTFE膜20具有与通过以往的制法、即将包含PTFE细粉和液体润滑剂的成形体拉伸而得到的拉伸PTFE多孔膜不同的结构。利用以往的制法得到的拉伸PTFE多孔膜具有其整体由大量原纤维和节点构成的非实心的结构。在该非实心的结构中存在在膜中连续扩展的单一的孔。与此相对,PTFE膜20虽然与以往的拉伸PTFE多孔膜同样地具有孔,但具有在作为非多孔体的母体中形成有多个孔21的结构。
孔21沿PTFE膜20的厚度方向伸长。孔21包含贯穿PTFE膜20的通孔21t和未贯穿的有底孔21c。由于孔21的存在,PTFE膜20的孔隙率取正值,由于通孔21t的存在,PTFE膜20的透气度取正值。为了缓和伴随温度变化的电子设备内的冷却空间的压力变化,优选透气度取正值(不为零)。
在例如像空气过滤器那样要求高透气性的用途中,由原纤维和节点形成的多孔结构更为适合。该多孔结构作为防水透声膜也有用。但是,对于要求高防水性的防水透声膜而言,有时PTFE膜20所具有的膜结构可以实现更优选的特性。本发明的优选实施方式中,使用形成有多个孔21的实心的膜。例如,可以通过将由PTFE的分散体系得到的实心的膜轻微拉伸而形成孔21来得到该膜。
PTFE膜20的依据ASTM(美国试验材料协会)F316-86测定的平均孔径为0.02μm以上且0.1μm以下。PTFE膜20的孔隙率为5%以上且25%以下。从确保防水性的观点出发,平均孔径和孔隙率以小为宜(为零)。但是,为了兼具透声性,平均孔径和孔隙率的范围如上设定。PTFE膜20的平均孔径优选为0.04μm以上且0.08μm以下。PTFE膜20的孔隙率优选为5%以上且23%以下。
从以更高水平兼具透声性和防水性的观点考虑,PTFE膜20的厚度优选为5μm以上且15μm以下,更优选为5μm以上且10μm以下。从同样的观点考虑,PTFE膜20的面密度例如为13g/m2以上且35g/m2以下,优选为15g/m2以上且35g/m2以下,更优选为15g/m2以上且25g/m2以下。
作为防水性的指标,可举出耐水压。例如,使用JISL1092:2009中记载的耐水度试验机(高水压法),在PTFE膜的加压面的相反侧设置不锈钢网(开口直径:2mm),由此在将PTFE膜的变形抑制在一定程度的状态下测定PTFE膜的耐水压即可。这样测定时的防水透声膜10(PTFE膜20)的耐水压优选为400kPa以上,更优选为500kPa以上。
作为透声性的指标,可举出对于1000Hz的声音的插入损耗。防水透声膜10(PTFE膜20)对于1000Hz的声音的插入损耗优选3.5dB以下,更优选3dB以下,进一步优选2.5dB以下。作为透声性的指标,也可举出对于规定的频率范围的声音的插入损耗。防水透声膜10(PTFE膜20)对于100~5000Hz的声音的插入损耗优选3.5dB以下,更优选3dB以下。但是,插入损耗过小时,存在难以确保防水性的倾向。考虑到该情况,防水透声膜10(PTFE膜20)对于1000Hz的声音的插入损耗可以为1dB以上。另外,防水透声膜10(PTFE膜20)对于100~3000Hz的声音的插入损耗可以为1dB以上。插入损耗可以定义为在声源与声接收点之间配置有防水透声膜10的状态下测定的声音的衰减量(声压水平)A与除了不设置防水透声膜10以外在同一条件下测定的声音的衰减量B的差值。
作为透气性的指标,可举出通过JISL1096中规定的透气性测定法的B法(葛尔莱法)得到的值。PTFE膜20的厚度方向的透气度以该值计例如为1000~60000秒/100mL。
PTFE膜20可以被着色。例如,可以在PTFE膜20的表面20f或背面20b涂布染料或颜料。另外,可以在PTFE膜20的内部含有黑色的碳。例如,只要根据壳体的颜色,将PTFE膜20着色为PTFE膜20变得难以引人注目的颜色即可。需要说明的是,未着色的PTFE膜20为白色。
可以对PTFE膜20进行拒液处理。拒液处理使PTFE膜20的拒水性能或拒油性能提高。在拒液处理中,可以使用含有具有全氟烷基的聚合物的拒液剂。
防水透声膜可以包含增强构件和粘合层。图3和4所示的防水透声膜40具备围绕透声区域41的周边区域42,在周边区域42包含固定于PTFE膜20的增强构件50和从PTFE膜20观察在与增强构件50相反侧固定于PTFE膜20的粘合层60。由于包含增强构件50,因此防水透声膜40得到增强,可以容易地操作防水透声膜40。另外,增强构件50作为紧固部分起作用,因此可以将防水透声膜40容易地安装于壳体。增强构件50也作为麦克风等的安装部分起作用。麦克风直接或间接安装于增强构件50时,透声区域41和麦克风的干扰得到抑制。另外,由于含有与外部空气接触的粘合层60,因此可以将防水透声膜40简便地安装于壳体。
增强构件50和粘合层60具有环状的形状,因此透声区域41具有PTFE膜20,周边区域42具有PTFE膜20、增强构件50和粘合层60。另外,透声区域41中的PTFE膜20的表面20f和背面20b与外部空气接触。但是,增强构件50和粘合层60的形状可以根据PTFE膜20的形状适当改变。例如,PTFE膜20具有方形的形状时,增强构件50和粘合层60的形状可以为方形框状。
增强构件50可以由树脂、金属、它们的复合材料等形成。PTFE膜20和增强构件50可以通过加热焊接、超声波焊接、利用胶粘剂的胶粘和利用双面胶带的胶粘等进行接合。粘合层60可以仅由粘合剂构成,也可以为双面胶带。
可以仅将增强构件50和粘合层60的一者设置于PTFE膜20。即,防水透声膜可以为具备围绕透声区域的周边区域,在周边区域包含固定于PTFE膜20的增强构件50的膜。另外,防水透声膜可以为具备围绕透声区域的周边区域,在周边区域包含固定于PTFE膜20的粘合层60的膜。
在图5和图6中,示出具备防水透声膜10(可以为防水透声膜40)的本发明的电子设备的一例。图5和图6所示的电子设备为手机80。在手机80的壳体89上,设置有用于扬声器86、麦克风87、蜂鸣器88等声发射部和声接收部的开口。以覆盖这些开口的方式,将防水透声膜10从内侧安装在壳体89上。该例中,防水透声膜10起到防止水、灰尘进入壳体89的内部、保护声发射部和声接收部的作用。
防水透声膜10也能应用于笔记本电脑、电子记事本、数码照相机、便携式音频播放器等具备声音功能的各种电气制品。总而言之,本实施方式的电子设备具备声发射部或声接收部、容纳声发射部或声接收部且设置有将声音引导至声发射部或声接收部的开口的壳体、和以覆盖开口的方式与壳体接合的防水透声膜。
接着,对适合于上述这样的具备具有PTFE膜的透声区域的防水透声膜的制造的制造方法的一例进行说明。
首先,将PTFE粉末的分散液(PTFE分散体系)涂布在基体上。可以按照公知的方法准备PTFE分散体系。PTFE分散体系可以为市售品。可以由耐热性塑料(聚酰亚胺、聚醚醚酮等)、金属、陶瓷等耐热性材料形成基体。基体的形状为片状、管状、棒状等形状等,没有特别限定。可以通过将基体浸渍于PTFE分散体系并提起的方法、在基体上喷雾PTFE分散体系的方法、在基体上涂刷PTFE分散体系的方法等在基体上涂布PTFE分散体系。为了使PTFE分散体系对基体表面的浸润性良好,在PTFE分散体系中可以含有聚硅氧烷类、含氟型等的表面活性剂。可以在涂布后使用计量杆来调节涂布厚度。
接着,通过对PTFE分散体系(和基体)进行加热,使分散介质蒸发并除去,并且使PTFE粉末相互粘结。在加热后,在基体的两面分别形成PTFE无孔膜。本实施方式中,采用下述方法:通过在分散介质的蒸发温度下将PTFE分散体系加热而除去分散介质,之后使其升温至PTFE的熔点以上的温度并加热规定时间的多步加热法。但是,可使用将PTFE分散体系在PTFE的熔点以上的温度加热规定时间的一步加热法。
本实施方式中,反复进行将PTFE分散体系涂布在基体上的工序和对PTFE分散体系加热的工序。不过,也可以分别实施一次这些工序。
接着,使PTFE无孔膜从基体剥离。将剥离后的PTFE无孔膜沿MD方向(长度方向)单轴拉伸。由此,可以得到图1和图2所示的具有孔的PTFE膜。可以将单轴拉伸的拉伸倍数设定为例如1.5~6.0倍,使得形成适当的大小的孔、不明显损害防水性而提高透声性。在沿MD方向拉伸后,可以沿TD方向(宽度方向)进一步拉伸。也就是说,可以将PTFE无孔膜双轴拉伸。此时,可以将MD方向的拉伸倍数设定为例如1.5~3.0倍,将TD方向的拉伸倍数设定为例如2.0~3.0倍,将MD方向的拉伸倍数与TD方向的拉伸倍数之积设定为例如3.0~9.0倍。
通过使用吻合式涂布机等将染料或颜料溶解于溶剂而得到的溶液涂布于PTFE膜,并使其干燥,由此可以将PTFE膜着色。另外,若在PTFE分散体系中含有碳,则可以得到黑色的PTFE膜。
实施例
通过实施例详细地说明本发明。不过,以下的实施例示出本发明的一例,本发明不限于以下的实施例。首先,对实施例和比较例所涉及的PTFE膜的评价方法进行说明。
<平均孔径>
依据ASTM(美国试验材料协会)F316-86的规定,测定了平均孔径。具体地,使用能依据该规定自动测定的市售的测定装置(PorousMaterial公司制的Perm-Porometer),测定了平均孔径。
<厚度>
使用千分尺,测定了厚度。
<面密度>
用φ47mm的冲头冲裁实施例或比较例的PTFE膜,测定冲裁的部分的质量,并换算为每1m2的质量而求出面密度。
<孔隙率>
由体积和重量求出体积密度,将PTFE膜的真密度设为2.18g/cm3,由{1-(重量[g]/(厚度[cm]×面积[cm2]×真密度[2.18g/cm3]))}×100(%)的式子求出孔隙率。
<耐水压>
使用JISL1092:2009中记载的耐水度试验机(高水压法),测定了PTFE膜的耐水压。不过,由于在该规定中示出的试验片的面积的情况下防水透声膜显著变形,因此通过将不锈钢网(开口直径:2mm)设置于PTFE膜的加压面的相反侧而将PTFE膜的变形抑制在一定程度,在该状态下测定了PTFE膜的耐水压。
<透气度>
依据JISL1096中规定的透气性测定法的B法(葛尔莱法),评价了PTFE膜的透气度。
<声学特性(插入损耗)>
如下评价实施例或比较例的PTFE膜的声学特性。最初,如图7所示,制作了评价用系统。首先,准备与扬声器电缆142连接的扬声器140(Star精密公司制,SCG-16A)和聚氨酯海绵制的填充材料130(图7(A))。填充材料130由形成有直径为5mm的透声孔132的部件130a、要成为填充材料130的底部的部件130c、和形成有用于容纳扬声器140和扬声器电缆142的槽且要被夹在部件130a与部件130c之间的部件130b构成。接着,在将扬声器140和扬声器电缆142容纳于部件130b的槽的状态下,组装了填充材料130(图7(B))。接着,准备了聚苯乙烯制的模拟壳体120(图7(C))。模拟壳体120由形成有直径为2mm的透声孔122和缺口124的部件120a和要成为模拟壳体120的底部的部件120b构成。接着,以将扬声器140、扬声器电缆142和填充材料130容纳于内部、且将扬声器电缆142从缺口124向模拟壳体120的外部引出的方式,组装了模拟壳体120(图7(D))。组装后的模拟壳体120的外部尺寸为60mm×50mm×28mm。接着,用油灰堵住基于缺口124的开口。
接着,在模拟壳体120的透声孔122的外侧粘贴了评价用样品110(图8、图7(D))。评价用样品110是依次层叠厚度0.20mm的双面胶带107(日东电工公司制No.57120B)、实施例或比较例的PTFE膜101(PTFE膜E1、E2、E3、C1、C2或C3)、厚度0.03mm的双面胶带106(日东电工公司制No.5603)和厚度0.1mm的PET膜105而得到的层叠体。双面胶带107是由丙烯酸类粘合剂夹住聚乙烯类发泡体的基材而成。双面胶带106是由丙烯酸类粘合剂夹住PET基材而成。双面胶带107、双面胶带106和PET膜105以内径为2.5mm、外径为5.8mm的方式冲裁而成,PTFE膜101以外径为5.8mm的方式冲裁而成。
接着,以覆盖PTFE膜101的方式,在PTFE膜101的上方设置了麦克风150(KnowlesAcoustics公司制,SPM0405HD4H-WB)(图7(E))。另外,将扬声器电缆142和麦克风150连接于声学评价装置(B&K公司制,Multi-analyzerSystem3560-B-030)。扬声器140与麦克风150的距离为21mm。
在这样的状态下,根据从声学评价装置向扬声器140输入的试验信号和由麦克风150接收的信号,求出信号的衰减量A。另外,在通过破坏PTFE膜101而形成了直径为2.5mm的通孔的状态下,同样地求出信号的衰减量B(空白的声压水平)。衰减量B为-21dB。通过衰减量B减去衰减量A,求出PTFE膜101的声音的插入损耗。插入损耗越小,可以判断越是保持了由扬声器140输出的音量。该试验中,作为评价方式,选择了SSR分析(试验信号:20Hz~10kHz,扫描)。另外,该试验中,通过声学评价装置,自动地求出了插入损耗。
<实施例1>
准备了未烧结PTFE粉末的浓度为40重量%的水性分散体系(PTFE粉末的平均粒径0.2μm,相对于PTFE100重量份,配合6重量份非离子表面活性剂)。在该水性分散体系中,以相对于PTFE100重量份含氟表面活性剂为1重量份的比例的方式添加了含氟表面活性剂(大日本油墨公司制,MegaFacF-142D)。在得到的分散体系中浸渍厚度125μm的长尺寸聚酰亚胺膜(基体)并提起。接着,通过计量杆,将在基体上涂布的分散体系的厚度调节为13μm。接着,通过在100℃将分散体系(和基体)加热1分钟而使水蒸发除去,接着在390℃加热1分钟,由此使PTFE粉末相互粘结。合计反复进行3次同样的浸渍、涂布和加热。由此,在基体的两面分别形成了PTFE无孔膜。接着,使PTFE无孔膜从基体剥离。得到的PTFE无孔膜的厚度为14μm。接着,将PTFE无孔膜沿MD方向在拉伸温度150℃、拉伸倍数3倍的条件下进行了拉伸。由此,得到PTFE膜E1。PTFE膜E1的厚度为8μm。
<实施例2>
除了将拉伸PTFE无孔膜时的拉伸倍数变更为2倍以外,通过与实施例1同样的步骤得到PTFE膜E2。
<实施例3>
除了将拉伸PTFE无孔膜时的拉伸倍数变更为3.5倍以外,通过与实施例1同样的步骤得到PTFE膜E3。
<比较例1>
将实施例1中的PTFE无孔膜作为PTFE膜C1。
<比较例2>
通过计量棒将在基体上涂布的分散体系的厚度调节为15μm、合计反复进行4次浸渍、涂布和加热,除此以外,通过与实施例1同样的步骤得到PTFE无孔膜。将该PTFE无孔膜作为PTFE膜C2。PTFE膜C2的厚度为25μm。
<比较例3>
将PTFE细粉(三井杜邦公司制,650-J)100重量份和作为成形助剂的正十二烷(日本能源公司制)20重量份均匀混合。通过料筒将得到的混合物压缩,之后进行柱塞挤出而制成片状的混合物。使得到的片状的混合物通过一对金属辊而压延至厚度0.16mm,进一步通过150℃的加热而将成形助剂干燥除去。由此,得到PTFE的片状成形体。将该片状成形体重叠2层。沿长度方向(压延方向)在拉伸温度260℃、拉伸倍数5倍的条件下对得到的层叠体进行了拉伸。由此,得到PTFE多孔膜。接着,将该PTFE多孔膜在拒液处理液中浸渍数秒钟,之后在100℃加热,由此使溶剂干燥除去。如下制备了拒油处理液。首先,将下述的(式1)所示的具有直链氟烷基的化合物100g、作为聚合引发剂的偶氮二异丁腈0.1g和溶剂(信越化学公司制,FSThinner)300g投入安装有氮气导入管、温度计和搅拌机的烧瓶中。接着,在该烧瓶内导入氮气。边搅拌烧瓶的内容物边在70℃进行16小时加聚,从而得到含氟聚合物80g。该含氟聚合物的数均分子量为100000。用稀释剂(信越化学公司制,FSThinner)稀释使得该含氟聚合物的浓度为3.0质量%,从而制备了拒液处理液。
CH2=CHCOOCH2CH2C6F13(式1)
接着,将拒液处理后的PTFE多孔膜在拉伸温度150℃、拉伸倍数30倍的条件下沿宽度方向拉伸,然后在超过PTFE的熔点(327℃)的温度360℃下将整体烧结。由此,得到PTFE膜C3。PTFE膜C3的厚度为20μm。
关于PTFE膜E1~E3和PTFE膜C1~C3,在表1中示出测定平均孔径、厚度、孔隙率、耐水压、透气度和插入损耗的结果。表1的插入损耗是使用1000Hz的声音时的测定结果。在图9中示出关于各PTFE膜的声音的频率与插入损耗的关系。另外,使用扫描型电子显微镜(SEM)观察PTFE膜E1的表面。在图10和11中示出得到的SEM图像。图10的SEM图像是将倍数设定为5000倍拍摄而成。图11的SEM图像是将倍数设定为20000倍拍摄而成。
[表1]
根据表1可知,PTFE膜E1、PTFE膜E2和PTFE膜E3的耐水度为400kPa以上(更详细地为420kPa以上,进一步详细地为450kPa以上,更进一步详细地为500kPa以上)。根据表1还可知,PTFE膜E1和PTFE膜E3的对1000Hz的声音的插入损耗为3.5dB以下(更详细地为3dB以下,进一步详细地为2.5dB以下,更进一步详细地为2.0dB以下)。可知PTFE膜E2的对1000Hz的声音的插入损耗为3.5dB以下(更详细地为3dB以下)。如图9所示,PTFE膜E1的对100Hz的声音的插入损耗为2.3dB,对1000Hz的声音的插入损耗为1.8dB,对2000Hz的声音的插入损耗为1.6dB,对3000Hz的声音的插入损耗为1.0dB,在100Hz~5000Hz之间随着频率变高而插入损耗降低。也就是说,根据图9可知,PTFE膜E1的对100~5000Hz的声音的插入损耗为3.5dB以下(更详细地为3.0dB以下,进一步详细地为2.5dB以下)。PTFE膜E2的对100Hz的声音的插入损耗为3.3dB,对1000Hz的声音的插入损耗为2.9dB,对2000Hz的声音的插入损耗为2.8dB,对3000Hz的声音的插入损耗为2.5dB,在100Hz~5000Hz之间随着频率变高而插入损耗降低。也就是说,根据图9可知,PTFE膜E2的对100~5000Hz的声音的插入损耗为3.5dB以下(更详细地为3.0dB以下)。PTFE膜E3的对100Hz的声音的插入损耗为1.9dB,对1000Hz的声音的插入损耗为2.0dB,对2000Hz的声音的插入损耗为1.8dB,对3000Hz的声音的插入损耗为1.1dB,对100~5000Hz的声音的插入损耗为2.5dB以下(更详细地为2.0dB以下)。根据表1和图9所示的实验结果可知,PTFE膜E1、PTFE膜E2和PTFE膜E3兼具防水性和透声性。另外,根据图10和图11可以确认在PTFE膜E1中形成了孔。
产业实用性
本发明的防水透声膜可以适合在容纳有声学装置的电子设备中使用。具体地可以适合在手机、数码摄像机等中使用。
Claims (7)
1.一种防水透声膜,其用于在容许声音通过的同时防止水的进入,其中,
所述防水透声膜具备具有聚四氟乙烯膜的透声区域,
所述聚四氟乙烯膜的根据ASTMF316-86测定的平均孔径为0.02μm以上且0.1μm以下、孔隙率为5%以上且25%以下。
2.根据权利要求1所述的防水透声膜,其中,所述聚四氟乙烯膜为形成有相互独立的多个孔的实心的膜。
3.根据权利要求1所述的防水透声膜,其中,所述聚四氟乙烯膜的厚度为5μm以上且15μm以下。
4.根据权利要求1所述的防水透声膜,其还具备围绕所述透声区域的周边区域,在所述周边区域中,还包含固定于所述聚四氟乙烯膜的粘合层。
5.根据权利要求1所述的防水透声膜,其还具备围绕所述透声区域的周边区域,在所述周边区域中,还包含固定于所述聚四氟乙烯膜的增强构件。
6.根据权利要求1所述的防水透声膜,其还具备围绕所述透声区域的周边区域,在所述周边区域中,还包含固定于所述聚四氟乙烯膜的增强构件、和从所述聚四氟乙烯膜观察在与所述增强构件相反侧固定于所述聚四氟乙烯膜的粘合层。
7.一种电子设备,其具备:
声发射部或声接收部、
容纳所述声发射部或所述声接收部并设置有将声音引导至所述声发射部或所述声接收部的开口的壳体、和
以覆盖所述开口的方式接合于所述壳体的权利要求1所述的防水透声膜。
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CN110278513A (zh) * | 2019-05-23 | 2019-09-24 | 深圳市伊声声学科技有限公司 | 防水透气膜及其制造方法以及微型扬声器 |
WO2019210525A1 (zh) * | 2018-05-02 | 2019-11-07 | 深圳市坤叶科技有限公司 | 防尘防水透声保护膜 |
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