HIGH LIGHT-TRANSMISSIVE DUST-PROOF BODY AND METHOD OF PREPARING SAME

摘要

A high light-transmissive dust-proof body (1) equipped with a holding frame (2) to be mounted in use on a mask substrate (5) and a transparent light-transmissive film (3) mounted on the holding frame (2), wherein the light-transmissive film (2) either comprises an inorganic film having a thickness of 0.2 mu m to less than 10 mu m and transmitting light having wavelengths of 240 to 500 nm at an average light transmittance of at least 85%, or forms (i) a three-layer structure of a low refractive index layer/high refractive index layer/base layer, or (ii) a five-layer structure comprising a low refractive index layer/high refractive index layer/base layer/high refractive index layer/low refractive index layer, the high refractive index layer being an inorganic layer and the low refractive index layer being an organic polymer layer.