Patent ID: 6050110
Filing Date: 2000-04-18
Classification: C03B,G02B

Abstract:
A manufacturing method for a glass product, comprising the steps of:placing a glass material in a cavity defined by, at least, a lower mold and an upper mold, either one of which has in addition to inherent surface roughness a fine structure having a prescribed shape for transferring a fine structure having the reverse of said shape onto the glass product;molding the glass material in the cavity with pressure into the glass product in so controlling that the glass material has a viscosity range of 10.sup.6.5 to 10.sup.9.5 poises at the beginning of said molding with pressure, that the mold having the fine structure is at a temperature in a range such that the glass material has a viscosity range of 10.sup.6.5 to 10.sup.9.5, and that the mold not having the fine structure is at a temperature in a range such that the glass material has a viscosity 5 to 100 times higher than the viscosity of the glass material at the temperature of the mold having the fine structure.