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In this paper, we develop a method to design a flexible thin film audio systems utilizing Polyvinylidene fluoride. The system we designed showed the properties of increased transparency and sound pressure levels. As an input terminal transparent oxide thin film is adopted. In order to provide dielectric insulation, a transparent insulating oxide thin film is coated to obtain double -layered structure. In the range of visible light, the output from the output of the system showed an increased and improved sound pressure level. The piezoelectric polymer film of polyvinylidene fluoride (PVDF) is used to produce mechanical vibration due to the applied electrical voltage signal. An analog electric voltage signal is transformed into sound waves in the audio system. Key words : Light-emitting devices, Piezoelectric materials, Polyvinylidene fluoride (PVDF), Sound pressure level (SPL). 1. I NTRODUCTION With the development of electronic and electrical technology in recent years, various kinds of devices and equipments are produced. A light-emitting devices utilizing electrical signals, memory devices for storing information, wireless communication devices for the near and far field, and sensor elements are important building blocks used in display devices, cell phones, MP3 players, and digital cameras. Such devices have been designed on a solid printed circuit board. In doing so, the reliability, miniaturization, light-weight, thin-thickness, integration, and portability are main technical concerns. In order to develop devices of miniaturization, light-weight, and thin-thickness a printed circuit board is used. The piezoelectric polymer film of polyvinylidene fluoride (PVDF) is used to produce mechanical vibration due to the applied electrical voltage signal. An analog electric voltage signal is transformed into sound waves in the audio system. Conductive molecular particles of MEH-PPV/PVDF are melted into a solvent. The solvent are coated on the surfaces of PVDF by roll-to-roll coating or conducting mechanism. We introduced a protective membrane to safeguard the electric leakage from the surface of conductive molecular coating material. The thickness of coating material is about a three to four hundreds micrometers. Our system is designed in hybrid format so that the audio speaker is adopted. It is flexible, light-weight. It can be operated with a low level of voltage. |
