Quartz glass plates with high refractive index homogeneity

US6553789B1 · kind B1 · utility

Assignee

• Schott Glas · DE

Inventors

• Rolf Martin · Sherman, US
• Andreas Menzel · Jena, DE
• Frank Coriand · Jena, DE
• Wolfgang Schmidt

Key dates

• Filing date: Apr 27, 2001
• Grant date: Apr 29, 2003
• Expiry date: Apr 27, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B32/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method produces homogenous quartz glass plates without streaks. The method is applied to starting quartz glass body which has an X—X geometrical axis and good refractive index homogeneity in its central area, and a refractive index homogeneity decreasing as the axis lies further from a central area. The body is divided into at least two concave parts by longitudinal cuts parallel to the axis once the central area has been processed out of the body. The parts are placed separately in corresponding molds and heated therein such that they are molded to form quartz glass plates having a desired thickness.