Tomohiro Yamada

Light-absorbing wide-band AR coatings on PET films by sputtering

Abstract Wide-band antireflection (AR) coating employing a light-absorbing layer, has been applied to PET film with acrylic anti-abrasion coating. A properly designed RF plasma treatment of the PET substrate before the deposition has been found to play an important role in the improvement of the adhesion at the interface. Ar and N2 were found to be better atmosphere gas species for the RF plasma treatment compared to O2. RF electrode located behind the substrate was found to be in good geometrical arrangement reducing the treatment time to obtain enough adhesion strength. An insertion of a thin SiNx between the AR layers and PET film also improved the adhesion. Using these combined pre-treatments before the deposition of the AR coating, a wide-band AR coating with good mechanical properties has been realized on PET film substrate. This coating also showed a sufficiently low sheet resistance which is often required for the electromagnetic shielding of cathode ray tubes (CRTs).

Absorptive anti-reflection coating for cathode ray tubes

A new design of three-layer anti-reflection coating has been developed using a highly absorptive TiNxOy layer and a slightly absorptive SiNx layer together with a low refractive index SiO2 layer. It can cover the transmission range of from 40 to 70% with good anti-reflection property.