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Hydrogen-free diamond-like carbon(DLC) thin films were deposited at low temperature(less than 100°C) by an RF magnetron sputtering facility.DLC films have the ability to change the sound velocity(E/) in loudspeakers for applications of hard coating.The hydrogen-free DLC films were coated onto PEI diaphragm substrates.The I D /I G ratio and the surface roughness are 2.09 and less than 0.86 nm(Ra) with a scanning area of 50 m×50 m,respectively.Frequency response analysis of the DLC films on the diaphragm shows that the high frequency response increases by 0.2 dB-5.1 dB(6 kHz-11.2 kHz),0.4 dB-1.8 dB(11.8 kHz-20 kHz) on average.On the basis of the results of this study,we validated that it was feasible to sputter hydrogen-free DLC films on polymer substrates for mass production.These results also provided useful parameters for future applications of electro-acoustic devices.
Hydrogen-free diamond-like carbon (DLC) thin films were deposited at low temperature (less than 100 ° C) by an RF magnetron sputtering facility. DLC films have the ability to change the sound velocity (E /) in loudspeakers for applications of The ID / IG ratio and the surface roughness are 2.09 and less than 0.86 nm (Ra) with a scanning area of 50 m × 50 m, respectively. Frequency response analysis of the DLC films on the diaphragm shows the high frequency response increases by 0.2 dB-5.1 dB (6 kHz-11.2 kHz), 0.4 dB-1.8 dB (11.8 kHz-20 kHz) on average. On the basis of the results of this study, we validated that it was feasible to sputter hydrogen-free DLC films on polymer substrates for mass production. The results also provided useful parameters for future applications of electro-acoustic devices.