ta-C coating method for protective layer of infrared ray optical lens

The present invention is an infrared optics as the lens on the protective film ta-C coating method for, more specifically, infrared optic, which hardness is high and no loss of the infrared transmittance can be formed in the optical performance is excellent ta-C thin film of a single layer in the infrared optical lens It relates to ta-C coating method for the protective film lens. ta-C coating method for an infrared optical lens protective film comprises a coating step of forming a (tetrahedral amorphous carbon) ta-C shields the infrared optical lens, the coating step of the present invention, the magnetic field was filtered arc (filtered cathodic vacuum arc) method of the protective film is formed by a vacuum arc deposition method.