Key Technology > Production Engineering Technologies > Optical Thin-Film Technology
Providing 99.9% Light Transmittance
Optical Thin-Film Technology
Reflections from glass lenses are typically between 4% and 8% per surface, but a lens set, normally made up of from 5 to 10 lenses, loses more than half of its light transmittance without anti-reflective coatings.
Anti-reflection effect achieved by the optical thin film
Plasma-Sputtering Thin-Film Deposition System
Anti-reflective films make use of the light-wave interference effect. Applying a multilayered, anti-reflective coating over the lens surface makes it possible to ensure light transmittance of 99.9% across the spectrum, from ultraviolet to near infrared, for remarkable image clarity, free of flaring and ghosting.
For the lenses used in excimer laser steppers, which require an extraordinary level of performance, Canon introduced the world's-first plasma-assisted sputtering technique, realizing extreme UV lithography with high-precision, stable films. This thin-film technique improves light transmittance in stepper lenses by 10% or more.
