| 摘要 |
<p>PURPOSE: An electret for electret condenser microphone is provided to enhance a heat-resistant characteristic, an electrostatic field, and sensitivity by forming a thin film on a metal plate and charging charges to the thin film. CONSTITUTION: A thin film(12) is formed on a metal plate(10) by performing a spin coating process for one selected from an SOG(Spin On Glass), a flare, and a Teflon. An electret is formed by charging electrons to the thin film(12). SiO2 as a raw material of the electret is obtained by performing a curing process under high temperature of 100 to 500 degrees centigrade after the SOG of a liquid state at normal temperature is coated on the metal plate(10). The metal plate(10) is formed by one selected from phosphorous bronze, cooper, and aluminum. The thickness of the thin film is 0.01 to 10 micro meter.</p> |
