Method of producing heat-resistant electrically charged resin material, electret condenser microphone using the heat-resistant electrically charged resin material, and method of producing the same
OwnerMegumi Horiuchi, Yuki Tsuchiya +1inventors
InventorsMegumi Horiuchi, Yuki Tsuchiya, Keiji Watanabe
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Abstract
A fluororesin material is irradiated with ionizing radiation at a temperature not lower than the crystalline melting point of the fluororesin material in the absence of oxygen to form a crosslinked modified fluororesin material. An electric charge is implanted into the modified fluororesin material to provide a heat-resistant electrically charged resin material suitable for use as an electret element of an electret condenser microphone or the like.
Claims13
A method of producing a heat-resistant electrically charged resin material, comprising the steps of:
- providing a fluororesin material;
- irradiating said fluororesin material with ionizing radiation at a temperature not lower than a crystalline melting point of said fluororesin material in absence of oxygen, thereby changing said fluororesin material into a crosslinked modified fluororesin material;
- and
- implanting an electric charge into said modified fluororesin material.
An electret condenser microphone comprising an electret layer, wherein said electret layer is made of a heat-resistant electrically charged resin material, said resin material being prepared by implanting an electric charge into a modified fluororesin material crosslinked by irradiating a fluororesin material with ionizing radiation at a temperature not lower than a crystalline melting point of said fluororesin material in absence of oxygen.
A method of producing an electret condenser microphone comprising a diaphragm, a spacer, an electret layer, and a backplate, said method comprising the steps of:
- forming a resin layer of a fluororesin on said backplate;
- irradiating said resin layer with ionizing radiation at a temperature not lower than a crystalline melting point of said fluororesin in absence of oxygen, thereby changing said resin layer into a crosslinked modified fluororesin layer;
- and
- implanting an electric charge into said modified fluororesin layer to form said electret layer.
Dependencies are inferred from the claim text.