Patent · US Active

Method for producing an optical blank from synthetic quartz glass

US10807901B2 · kind B2 · utility

0Cited by

6References

20Claims

0Family size

Assignee

HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

Andreas Kaske · Bruchköbel, DE
Klaus Becker · Hanau, DE
Stefan Ochs · Bad Camberg, DE

Key dates

Filing date	Sep 22, 2017
Grant date	Oct 20, 2020
Priority date	—
Expiry date	Sep 10, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B2201/02
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

One aspect relates to a method for producing an optical blank from synthetic quartz glass by vitrifying and shaping a porous, cylindrical SiO2 soot body having a longitudinal axis, in a heating zone including a melt mold with bottom plate. The SiO2 soot body vitrified in the heating zone at a vitrification temperature so as to form a full cylindrical, completely vitrified, transparent quartz glass body. Subsequently, the vitrified quartz glass body is shaped by softening in the melt mold at a softening temperature so as to form a viscous quartz glass mass which partly fills the volume of the melt mold, and cooling the quartz glass mass and removal from the melt mold so as to form the optical blank. During shaping in the melt mold, the full cylindrical quartz glass body is brought into contact by way of controlled supply with a centering means of the bottom plate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.