NEAR INFRARED CUTOFF FILTER

摘要

To provide a near infrared cutoff filter at low costs, which is useful as cover glass for a solid state imaging sensor package, by providing a thin film attenuation layer for effectively shieldingαrays emitted from substrate glass in a form not to influence the optical characteristics. A near infrared cutoff filter comprising substrate glass made of fluorophosphate glass containing CuO or phosphate glass containing CuO, and a thin film attenuation layer formed on at least one light-permeable surface of the substrate glass to attenuateαrays emitted from the substrate glass.