Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a quartz glass formed body having optical characteristics suitable for optical use by eliminating influence of striae with no heat treatment for removing striae even when the quartz glass formed body has a relatively large diameter.SOLUTION: A method of manufacturing an optical quartz glass formed body includes a process of obtaining a plate formed body by pressurizing a quartz glass ingot compounded by a direct method from the same direction as the growth direction of the ingot, and a process of deleting one or both faces (hereinafter, referred to as a pressurized formed face) formed by pressurizing the obtained plate formed body until no striae can be observed by visual inspection from the vertical direction of the pressurized formed face to obtain the quartz glass formed body.
Abstract:
PROBLEM TO BE SOLVED: To provide a corrosion resistant glass member having sufficient corrosion resistance against a halogen gas, excellent workability, small Al contamination and low in selective corrosion causing the occurrence of particles. SOLUTION: A part of the corrosion resistant glass member where exposed by the halogen gas contains 50-1,000 wt.ppm Al and has a melt-treated surface. The member is manufactured by mixing silica power, transition alumina powder and/or alumina-silica compound oxide power and melting the mixture. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a quartz glass excellent in ultraviolet absorptivity and visible light transmittance and excellent in devitrification resistance and heat resistance and to provide a method for producing the same. SOLUTION: The synthetic quartz glass controlled so as to have an OH group content of at most 20 ppm, an H 2 molecule content of at most 1×10 17 molecules/cm 3 , a Cl content of at most 10 ppm, and a total metal impurity content of at most 1 ppm is excellent in ultraviolet absorptivity and visible light transmittance and excellent in devitrification resistance and heat resistance. The quartz glass can be produced by treating a soot body with an NH 3 -containing atmosphere in a soot synthesis method and vitrifying the treated soot body. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a low cost synthetic quartz glass for vacuum ultraviolet light which has excellent homogeneity and is manufactured using existing general equipment without carrying out excessive and needless modification of a quartz glass synthesized by the soot method (VAD method) using a glass forming raw material such as SiCl 4 and a manufacturing method of the same and a mask substrate for vacuum ultraviolet light using the same. SOLUTION: The synthetic quartz glass for vacuum ultraviolet light has ≥70% transmissivity per 10 mm thickness in 163 mm wave length, the difference (refractive index distribution) of ≤5×10 -6 per 10 mm thickness between the maximum refractive index and the minimum refractive index in a region of 200 mm diameter and ≤5 nm/cm birefringence. The manufacturing method of the same and the mask substrate for vacuum ultraviolet light using the same are provided. COPYRIGHT: (C)2004,JPO