SOUND-TRANSMITTING FILM FOR MICROPHONE SOUND-TRANSMITTING FILM MEMBER FOR MICROPHONE PROVIDED WITH THE FILM MICROPHONE AND ELECTRONIC DEVICE PROVIDED WITH MICROPHONE

摘要

It is difficult to cut off the sound through a conventional sound insulating film such as a minute soundproofing or a water vapor by disposing it in a sound collecting mouth for guiding sound to the microphone so as to transmit sound while preventing intrusion of foreign matter from the sound collecting mouth into the inside of the microphone Thereby suppressing intrusion of foreign matter and providing a sound insulating film in which microphone performance is ensured. This sound insulating film for a microphone is constituted by a multilayer film containing a nonporous film or a nonporous film and has a surface density of 30 g / m²And the acoustic transmission loss in the frequency range of 300 to 4000 Hz is less than 3 dB.