UV-BANDPASS FILTER AND APPLICATION TO UV-DETECTING APPARATUS OR LIGHT-EMITTING APPARATUS

摘要

The present invention relates to a UV-bandpass filter for transmitting therethrough light having a wavelength included in a UV-region, and the like. The bandpass filter is an optical filter including a thin silver film; whereas the thin silver film comprises an entrance face and an exit face opposing the entrance face, for emitting light having a wavelength included in a specific UV-region whose wavelength ranges from 250 nm to 400 nm in the light having reached the entrance face, and has such a thickness as to yield a transmittance of 10 % or less with respect to light having a wavelength excluding the specific UV-region.